期刊文献+
共找到247篇文章
< 1 2 13 >
每页显示 20 50 100
Petrogenesis of Mesozoic High-Mg Diorites in Western Shandong: Evidence from Chronology and Petro-geochemistry 被引量:24
1
作者 Yang Chenghai Xu Wenliang +3 位作者 Yang Debin Liu Changchun Liu Xiaoming Hu Zhaochu 《Journal of China University of Geosciences》 SCIE CSCD 2005年第4期297-308,共12页
The high-Mg diorites, widely occurring in western Shandong, have important implications in the study of the relationship between the Mesozoic magmatism and the nature of the lithosphere and its thinning period in the ... The high-Mg diorites, widely occurring in western Shandong, have important implications in the study of the relationship between the Mesozoic magmatism and the nature of the lithosphere and its thinning period in the eastern North China craton (NCC). The Tietonggou and Jinling intrusions are typically representatives. LA-ICP-MS zircon U-Pb dating, major and trace element and Sr-Nd isotopic compositions of the Mesozoic intrusive rocks from western Shandong, eastern China, were analyzed. The weighted mean 106^pb/ 238^U ages from LA-ICP-MS zircon U-Pb dating results for early norite-diorite, late pyroxene-diorite from the Tietonggou intrusion and biotite-diorite from the Jinling intrusion are (131.4±4.9) Ma(n=15), (134. 5±2.3) Ma(n=13), and (132.8±4. 2) Ma(n=12), respectively, implying that they were formed in the Early Cretaceous. The weighted mean 207^pb/ 204^Pb ages for round zircons from late pyroxene-diorite in the Tietonggou intrusion is ( 2 513 ± 54) Ma( n= 8), suggesting that the basement of the North China craton should exist in the research area. The high-Mg diorites are characterized by enrichment in MgO, Na20, and light rare earth elements (LREE), and they are poor in heavy rare earth elements (HREE) and high field strength elements (HFSE), being similar to adakite. The existence of the mantle peridotite xenoliths with a high-Mg feature for these intrusive rocks implies that their primary magma should be derived from the upper mantle. However, Sr-Nd isotopic composi- tions (Is: 0.704 75--0.707 15;ENd (130 Ma) values: --3.95 to -- 13.30), depletion in HFSE, and the occurrence of Archean inherited zircons suggest that crustal materials could be involved in the derivation of the primary magma. The compositional difference between the diorites from the Tietonggou and Jinling intrusions could be attributed to those of magma sources and degrees of partial melting. The Early Cretaceous high-Mg diorites are considered to have been formed by the mixed melting of the delaminated lithosphere (lithospheric mantle + crust) and asthenosphere, based on their geochemistry, the mantlederived xenoliths, and the Early Mesozoic lithospheric evolutionary history of the eastern North China craton. 展开更多
关键词 high-Mg diorite CHRONOLOGY get chemistry MESOZOIC western shandong.
下载PDF
Evolution, Migration, Controlling Factors and Forming Setting of Mesozoic Basins in Western Shandong 被引量:2
2
作者 ZHANG Zhongyi WU Ganguo +1 位作者 GUO Jinghui ZHANG Da 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2005年第4期519-532,共14页
The distinctive topography in western Shandong province consists of several NW-WNW-trending mountain ranges and intervening basins. Basins, in which late-stage sediments to the south have progressively overlapped the ... The distinctive topography in western Shandong province consists of several NW-WNW-trending mountain ranges and intervening basins. Basins, in which late-stage sediments to the south have progressively overlapped the earlier sediments and "basement" rocks of the hanging-wall block, are bounded by S-SW-dipping normal faults to the north. Basin analysis reveals the Jurassic-Cretaceous sedimentary rocks accumulated both within the area of crustal extension and during extensional deformation; they contain a record of a sequence of tectonic events during stretching and can be divided into four tectonic-sequence episodes. These basins were initially developed as early as ca. 200 Ma in the northern part of the study area, extending dominantly N-S from the Early Jurassic until the Late Cretaceous. Although with a brief hiatus due to changes in stress field, to keep uniform N-S extensional polarity in such a long time as 130 Ma requires a relatively stable tectonic controlling factor responsible for the NW- and E-W-extensional basins. The formation of the extensional basins is partly concurrent with regional magmatism, but preceded magmatism by 40 Ma. This precludes a genetic link between local magmatism and extension during the Mesozoic. Based on integrated studies of basins and deformation, we consider that the gravitational collapse of the early overthickened continental crust may be the main tectonic driver for the Mesozoic extensional basins. From the Early Jurassic, dramatic reduction in north-south horizontal compressive stress made the western Shandong deformation belt switch from a state of failure under shortening to one dominated by extension and the belt gravitationally collapsed and horizontally spread to the south until equilibrium was established; synchronously, the normal faults and basins were developed based on the model of simple-shear extensional deformation. This may be relative to the gravitational collapse of the Mesozoic plateau in eastern China. 展开更多
关键词 MESOZOIC basin basin analysis extension gravitational collapse western shandong
下载PDF
SHRIMP Zircon U-Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications 被引量:1
3
作者 HU Huabin MAO Jingwen +4 位作者 LIU Dunyi NIU Shuyin WANG Yanbin LI Yongfeng SHI Ruruo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2005年第4期491-496,共6页
The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eight... The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine-grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving ^206Pb/^238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7±3.8 Ma, and the other eight yielded ^207Pb/^206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518±11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7±3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518±11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period. 展开更多
关键词 ZIRCON SHRIMP U-Pb dating age Middle Jurassic Tongshi magmatic complex western shandong
下载PDF
Formation Age of the Sujiagou Komatiites in Western Shandong: Further Constraints from SHRIMP U-Pb Zircon Dating on Granitic Dykes 被引量:1
4
作者 WAN Yusheng DONG Chunyan +1 位作者 XIE Hangqian WANG Shijin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2020年第4期877-883,共7页
Komatiites are presented as direct evidence for higher mantle temperatures during the Archean. In the North China Craton, komatiites with spinifex structure have been identified only at one locality, i.e. the Sujiagou... Komatiites are presented as direct evidence for higher mantle temperatures during the Archean. In the North China Craton, komatiites with spinifex structure have been identified only at one locality, i.e. the Sujiagou area, western Shandong. They were considered as formed during the early Neoarchean mainly based on their association with supracrustal rocks considered to be that age. This study carried out SHRIMP U-Pb zircon dating on metamorphosed trondhjemitic and monzogranitic dykes intruding the Sujiagou komatiites, and they have magmatic zircon ages of 2592 ± 12 Ma and 2586 ± 13 Ma respectively. This provides direct evidence that the komatiites formed during the early Neoarchean. 展开更多
关键词 granitic dyke SHRIMP U-Pb zircon dating Sujiagou komatiite Neoarchean western shandong
下载PDF
HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC ANALYSIS OF THE PERMIAN IN THE WESTERN SHANDONG AND HUAINAN-HUAIBEI COALFIELDS 被引量:1
5
作者 李增学 魏久传 韩美莲 《Journal of Coal Science & Engineering(China)》 1999年第1期1-10,共10页
The sedimentary characteristics and their combination succession of the Permian in the Shandong nd Huainan-Huaibei coalfields are analyzed. The mid-and short-term stratigraphic base-level cycles are identified. High-r... The sedimentary characteristics and their combination succession of the Permian in the Shandong nd Huainan-Huaibei coalfields are analyzed. The mid-and short-term stratigraphic base-level cycles are identified. High-resolution sequences are divided based on the above results. The study shows that the stratigraphic base-level cyclic method is an efficient way in the determination of the high-resolution sequences, especially in the classification of tbe terrestrial and transitional depositional succession. 展开更多
关键词 PERMIAN stratigraphic base-level cycles high-resolution sequence stratigraphic analysis western shandong coalfields Huainan-Huaibei coalfields
下载PDF
Analysis of a Continuative Fog Event in Western Shandong Province
6
作者 LI Jing GAO Liu-xi +1 位作者 CHEN Jin-min GAO Hui-jun 《Meteorological and Environmental Research》 2012年第7期19-22,34,共5页
[Objective] The aim was to study a continuative fog event in center and western Shandong Province from December 3 to 7 in 2011. [ Method] Based on regular meteorological data, a continuative heavy fog weather process ... [Objective] The aim was to study a continuative fog event in center and western Shandong Province from December 3 to 7 in 2011. [ Method] Based on regular meteorological data, a continuative heavy fog weather process during December 3 to 7 in 2011 was analyzed from the aspects of weather background, ground factors, T-Inp, and moisture and physical quantity field. [ Result] The heavy fog occurred under then at- mospheric circulation pattern controlled by the straight westerly air flow at 500 hPa middle latitudes, ridge of high pressure at middle and low levels, and weak pressure at the bottom of the surface high. The snowfall process for the formation of fog provided vapor conditions of fog, maintenance and development had benefited from lower layer of the warm and humid airflow. During the heavy fog, wind speed was between 1 and 3 m/s. The dew difference and visibility in the eady period had distinct daily changes, while the difference narrowed in the middle and later stage. Close to the ground was an obvious inversion layer, at the same time in the fog strong period temperature inversion layer were apparent between 700 and 800 hPa, these were helpful for fog formation and development. The stable atmospheric stratification, while low layer of weak convergence ascending motion, high level in the presence of weak divergence subsidence, these were also conducive to the maintenance and development of the fog. [ Conclusion] The study provided theoretical basis for the forecast of fog weather. 展开更多
关键词 Continuative fog western shandong Province: Process analysis China
下载PDF
Characteristics of mantle branch structure in western Shandong and its roles in minerogenesis and ore-controlling 被引量:4
7
作者 孙爱群 胡华斌 +4 位作者 牛树银 毛景文 王宝德 李英平 王来明 《Chinese Journal Of Geochemistry》 EI CAS 2006年第4期340-353,共14页
This work deals with the characteristics of mantle branch structure in western Shandong Province, China, with respect to the distribution characteristics and ages of the regional strata, the development of ring-like a... This work deals with the characteristics of mantle branch structure in western Shandong Province, China, with respect to the distribution characteristics and ages of the regional strata, the development of ring-like and radial faults, the development of gently inclined detachment-slip structures in the axial part, mantle-source magmatic activities, regional petrology, petrochemistry and isotope geology. The study indicated that the N-W sharply plunged ductile shear zone in the region of western Shandong cuts through the mantle rocks detached from the deep-seated North China mantle sub-plume, hence leading to unloading in response to depressurization and thereafter the formation of anatexis magma. The intense and complete magmatic evolution series not only manifests a variation trend of alkalinity of magma from high to low and its intrusive depth from deep to shallow, but also reflects that the wall-rock alteration shows a general evolution trend from strong to weak. The evolution of mantle structure played an important role in controlling endo-mineralogenesis, accompanied with the rise of the country rocks. As a result, typical mantle branch structures were formed as observed in western Shandong. At the top of the mantle branch structure was developed an obvious detachment-tilt fault block, and some endogenic ores, at the same time, were uplifted onto the shallow levels. 展开更多
关键词 地幔分支结构 地幔热流柱 地球物理学 地质学
下载PDF
Late Jurassic-Early Cretaceous Erg Deposits in the Mengyin Basin, Western Shandong Province, China: Inferences about the Wind Regime and Paleogeography 被引量:2
8
作者 Huan Xu Yongqing Liu +3 位作者 Hongwei Kuang Nan Peng Kemin Xu Jun Chen 《Open Journal of Geology》 2019年第10期700-703,共4页
The Late Jurassic-Early Cretaceous Santai Formation, sporadically distributed in western Shandong Province, comprises terrestrial alluvial-eolian successions, which records regional wind patterns and paleogeography in... The Late Jurassic-Early Cretaceous Santai Formation, sporadically distributed in western Shandong Province, comprises terrestrial alluvial-eolian successions, which records regional wind patterns and paleogeography in eastern North China. This paper conducts an analysis of eolian stratification, bounding surfaces, facies architecture and paleowind direction of the Santai Formation in the east of the Mengyin Basin, western Shandong Province. Three basic types of eolian stratification are recognized in the Santai Formation, including grainflow strata, wind ripple strata and adhesion strata, and have been grouped into eolian dune and interdune facies associations. The occurrences of reactivation surfaces and superimposition surfaces within eolian dune deposits indicate active compound dunes or draas. The association of adhesion strata with grainflow or windripple strata is the development of a wet eolian system. Cross-strata dip direction indicates different paleowind directions from the lower to the upper part of the Santai paleoerg. The lower part of the paleoerg was characterized by paleowinds blowing from northwest to northeast, whereas the upper part was under the influence of paleowinds consistently towards east to northeast. The identified changes in wind directions possibly suggest wind regime shifts from monsoon circulation to westlies of planetary wind system, which may be related with the collapse of the East China Plateau during the Late Jurassic to Early Cretaceous. 展开更多
关键词 Late Jurassic-Early Cretaceous Santai Formation western shandong Province EOLIAN Succession Wind REGIME East China Plateau
下载PDF
Petrogenesis of Paleoproterozoic diorite porphyries inLuojiazhuang, western Shandong: constraints fromLA-ICP-MS zircon U-Pb geochronology and geochemistry
9
作者 YANG Haotian SHI Jiangpeng +1 位作者 HUO tengfei YANG Donghong 《Global Geology》 2016年第2期78-84,共7页
Based on the study of LA-ICP-MS zircon U-Pb geochronology and whole-rock geochemistry for theLuojiazhuang diorite porphyries in Menying , western Shandong , the analyzed zircons exhibit oscillatory zoning in the catho... Based on the study of LA-ICP-MS zircon U-Pb geochronology and whole-rock geochemistry for theLuojiazhuang diorite porphyries in Menying , western Shandong , the analyzed zircons exhibit oscillatory zoning in the cathodoluminescence images and have high Th/U ratios (0. 15-1.53) , indicating a magmatic origin.In addition, most of the zircons have narrow metamorphic edges, suggesting that late metamorphic eventsmay exist. The youngest group of magmatic zircon 207Pb/206Pb ages rangng from 2 384 Ma to 2 234 Ma, yieldinga weighted mean age of 2 353 ± 14 Ma, which represents the forming age of the diorite porphyries, as theEarly Paleoproterozoic. Geochemically , the samples are characterized by low Si〇2(54. 54% and 55. 47% ),high MgO (5.22% and 5.49% ) and Mg# values (58 and 59) . Moreover , they show enrichment of light rareearth elements and large ion lithophile elements ( Rb , Ba and K) , depletion of heavy rare earth elements andhigh field strength elements (Nb, Ta , Zr and Hf) , positive anomaly of Pb , and negative anomaly of Ti. Thefact implies that the Luojiazhuang diorite porphyries might derive from partial melting of mantle and mixed with an amount of continental crust material. In summary , they may tectonic setting that stretching along the east-"west direction at the North China Craton in the Early Paleoproterozoic. 展开更多
关键词 PALEOPROTEROZOIC DIORITE porphyry GEOCHRONOLOGY GEOCHEMISTRY western shandong
下载PDF
Characteristics of Fault Gouge from the Northwest-Trending Faults in Western Shandong and Its Seismogeological Significance
10
作者 Wang HualinSeismological Bureau of Shandong Province,Jinan 250021,China 《Earthquake Research in China》 1994年第4期120-133,共14页
A systematical study is made on the characteristics of fault gouge from NW-trending faults in western Shandong.The macroscopic features of the fault gouge zones were investigated.From the data on surface structure of ... A systematical study is made on the characteristics of fault gouge from NW-trending faults in western Shandong.The macroscopic features of the fault gouge zones were investigated.From the data on surface structure of quartz fragments from the fault gouge and its maturity,the relative age,the movement mode,the rupture pattern,and the activities of the NW-trending faults are determined.Moreover,their seismogeological significance and some problems in study of fault gouge are discussed. 展开更多
关键词 western shandong Active FAULT Quartz FRAGMENTS Maturity of GOUGE FAULT activity
下载PDF
The genesis of Archean supracrustal rocks in the western Shandong Province of North China Craton: Constraints on regional crustal evolution 被引量:3
11
作者 WANG Wei ZHAI MingGuo M.SANTOSH 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第8期1583-1596,共14页
Archean greenstone belts are supracrustal sequences, the lower part of which is usually composed of voluminous ultramafic-mafic volcanics. Intermediate and acid volcanic rocks increase in abundance towards the upper d... Archean greenstone belts are supracrustal sequences, the lower part of which is usually composed of voluminous ultramafic-mafic volcanics. Intermediate and acid volcanic rocks increase in abundance towards the upper domains. Greenstone belts constitute ~30% of the total volume of Archean cratons, and preserve significant information on the surface environment and magmatism in the early earth, which are useful in unraveling the nature of crustal formation and evolution. The western Shandong Province(WSP) is located at the eastern part of the North China Craton(NCC), where greenstone sequences formed at ~2.7 and ~2.5 Ga were well preserved. The early Neoarchean supracrustal rocks include komatiite-basalt sequence, some meta-sediments of the lower part of the Taishan Group and the Mengjiatun Formation. The volcanism had been correlated to mantle plume, which resulted in vertical crustal accretion. The late Neoarchean supracrustal rocks were composed of metamorphosed felsic volcano-sedimentary sequences and BIFs of the upper part of the Taishan Group and the Jining Group. The geochemical features of the meta-volcanics show calc-alkaline affinities, similar to modern arc-related magmatism, suggesting that the continental crust in the western Shandong Province witnessed horizontal plate movements at ~2.5 Ga. The metasediments and leucosomes in the Qixingtai area display regional upper amphibolite facies metamorphism and anatexis at 2.53–2.50 Ga, coeval with formation of large volumes of crustally-derived granites. These tectono-thermal events suggest that a unified continental crust was formed in the western Shandong Province at the end of Neoarchean. 展开更多
关键词 Supracrustal rocks Greenstone belts Taishan Group western shandong Province North China Craton
原文传递
Discovery of dunite and pyroxenite xenoliths in Mesozoic diorite at Jinling,western Shandong and its significance 被引量:24
12
作者 XU Wenliang WANG Dongyan +1 位作者 GAO Shan LIN Jingqian 《Chinese Science Bulletin》 SCIE EI CAS 2003年第15期1599-1604,共6页
Abundant deeply-derived xenoliths are discovered in a Mesozoic diorite at Jinling, Zibo, western Shandong, which mainly consist of dunite and pyroxenite. The dunite can be further subdivided into two subtypes. The fir... Abundant deeply-derived xenoliths are discovered in a Mesozoic diorite at Jinling, Zibo, western Shandong, which mainly consist of dunite and pyroxenite. The dunite can be further subdivided into two subtypes. The first type shows tabular texture and high Mg# values (93—94) in olivines. The second type is characterized by the metamorphic-deformation texture superimposed by later metasomatism and relatively low olivine Mg# values (86—87). The mineral chemical data indicate that the former could be derived from ancient lithospheric mantle and the latter could have resulted from silica-rich melt metasomatism. The exsolution texture and the high Mg# value in clinopyroxenes, together with the rather high equilibrium temperature, imply that the pyroxenite xenoliths could be the cumulates of mantle-derived magma in the uppermost mantle or near the crust-mantle boundary in the Mesozoic. 展开更多
关键词 纯橄榄岩 辉岩 捕虏岩 闪长岩 中生代 山东 地质学
原文传递
Potash-rich volcanic rocks and lamprophyres in western Shandong Province:^(40)Ar-^(39)Ar dating and source tracing 被引量:40
13
作者 QIU Jiansheng, XU Xisheng & LO Ching-HuaState Key Laboratory of Mineral Deposit Research of Nanjing University, Nanjing 210093, China Department of Earth Sciences, Nanjing University, Nanjing 210093, China Department of Geology, Taiwan Unive 《Chinese Science Bulletin》 SCIE EI CAS 2002年第2期91-99,共9页
Highly precise 40Ar-39Ar dating results demon-strate that the ages of potash-rich volcanic rocks in western Shandong Province are 114.7-124.3 Ma, and that of the lamprophyres is 119.6 Ma. The potash-rich volcanic rock... Highly precise 40Ar-39Ar dating results demon-strate that the ages of potash-rich volcanic rocks in western Shandong Province are 114.7-124.3 Ma, and that of the lamprophyres is 119.6 Ma. The potash-rich volcanic rocks have relatively high (87Sr/86Sr)i ratios ( 0.708715-0.711418) and distinctly negative εNd values ( -11.47--17.54), and are enriched in radiogenic lead (206Pb/204Pb=17.341-17.622, 207Pb/204Pb=15.525-15.538, 208Pb/204Pb=37.563-37.684). Similarly, the lamprophyres also have quite low εNd values (-11.57 - -19.64). Based on the fact that the Sr, Nd and Pb isotopic compositions of potash-rich volcanic rocks are very consistent with that of the clinopyroxene separates, and by integrating comprehensive analyses of their tectonic settings, and extensive comparisons of the Sr, Nd isotopic composi-tions with that of the related simultaneous rocks, it is con-cluded that the potash-rich volcanic rocks and lamprophyres in western Shandong Province were most possibly derived from the partial melting 展开更多
关键词 potash-rich volcanic rocks LAMPROPHYRES 40Ar-39Ar DATING Sr-Nd-Pb isotope tracing western shandong Province.
原文传递
Petrogenesis of Shangyu gabbro-diorites in western Shandong:Geochronological and geochemical evidence 被引量:24
14
作者 YANG ChengHai XU WenLiang +3 位作者 YANG DeBin WANG Wei WANG WeiDe LIU JinMin 《Science China Earth Sciences》 SCIE EI CAS 2008年第4期481-492,共12页
Chronology and geochemistry of the Shangyu gabbro-diorite in western Shandong were studied to understand their petrogenesis and the nature of the Mesozoic lithospheric mantle. The Shangyu intru-sion is mainly composed... Chronology and geochemistry of the Shangyu gabbro-diorite in western Shandong were studied to understand their petrogenesis and the nature of the Mesozoic lithospheric mantle. The Shangyu intru-sion is mainly composed of a suite of gabbro-diorite. Zircons from the intrusion display eu-hedral-subhedral in shape and have high Th/U ratios (1.23―2.87), implying their magmatic origin. LA-ICP-MS zircon U-Pb dating results for two samples indicate that they were formed in the Early Cre-taceous, yielding weighted mean 206Pb/238U ages of 129±1Ma and 134±2Ma, respectively. Except for early cumulate such as sample QT-19, their SiO2 and MgO contents range from 50.12% to 56.37% and from 3.52% to 6.37%, respectively. Moreover, the gabbro-diorites are characterized by high Mg# (0.54―0.63), enrichment in Na (Na2O/K2O ratios more than 1), Cr (73×10-6―217×10-6) and Ni (34×10-6―241×10-6), and intensive enrichments in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in high field strength elements (HFSEs). Their initial 87Sr/86Sr ratios and ε Nd(t) values range from 0.70962 to 0.71081 and from-16.60 to-13.04, respectively. Taken together with the Early Creta-ceous high-Mg diorites and the mantle xenoliths from the Tietonggou and Jinling as well as basalts from the Fangcheng and Feixian, it is suggested that the primary magma for the Shangyu gab-bro-diorites should be derived from the enriched lithospheric mantle intensively modified by conti-nental crust. The Sr-Nd-Pb isotopic compositions for the Early Cretaceous high-Mg diorites in western Shandong display a trend of spatial variations, i.e., initial 87Sr/86Sr, 207Pb/204Pb and 208Pb/204Pb ratios de-creasing and ε Nd(t) values increasing from southeast to northwest in western Shandong, which is con-sistent with the tectonic model that the Yangtze Craton subducted beneath the North China Craton oriented in north-west direction in the Early Mesozoic. 展开更多
关键词 High-Mg DIORITE geochemistry zircon U-Pb dating PETROGENESIS Mesozoic western shandong
原文传递
山东龙郓煤业10·20冲击地压事故区域应力背景与防控研究
15
作者 孟静 张鹏 +4 位作者 王继明 丰成君 范玉璐 戚帮申 孙明乾 《地质力学学报》 CSCD 北大核心 2024年第3期473-486,共14页
矿山巷道、交通隧道等地下硐室围岩稳定与岩体所处区域地应力环境息息相关。分析区域深部地应力与地下硐室走向、形状等因素的关系,有助于提前规避硐室开挖风险。文章以山东龙郓煤业10·20冲击地压事故为背景,通过地应力测量与监测... 矿山巷道、交通隧道等地下硐室围岩稳定与岩体所处区域地应力环境息息相关。分析区域深部地应力与地下硐室走向、形状等因素的关系,有助于提前规避硐室开挖风险。文章以山东龙郓煤业10·20冲击地压事故为背景,通过地应力测量与监测工作,初步揭示了山东西部地壳浅表层现今地应力环境,结合龙郓煤业矿区附近现今地应力场特征,探讨此次冲击地压事故产生的区域应力背景,并从地应力角度提出相应的防控建议。研究结果表明:测量深度范围内主应力大小总体上与深度成正比线性关系,最大水平主应力值为3.48~20.76 MPa,随深度增加梯度为0.0182 MPa/m;最小水平主应力值为3.44~14.95 MPa,随深度增加梯度为0.0130 MPa/m;区内最大水平主应力方位为北东43°~89°,平均方位为北东75°;地壳浅表层构造作用以水平构造作用为主,但随着深度的增加,逐渐向垂直构造作用转变;龙郓煤业10·20冲击地压事故的诱发机制主要是垂向应力大于水平主应力,现今处于拉张应力环境,尤其是巷道走向平行于最大水平主应力方向;建议龙郓煤业巷道轴线与最大水平主应力方向的夹角为60°~90°,同时巷道顶板可以采用拱形顶板,确保巷道岩体稳定。 展开更多
关键词 山东西部 冲击地压 地应力测量与监测 地应力场特征 岩体稳定性
下载PDF
鲁西地区BIF型铁矿床控矿规律及找矿前景
16
作者 郝兴中 王巧云 +5 位作者 智云宝 朱学强 张文 张华平 彭观峰 李英平 《矿产勘查》 2024年第7期1167-1175,共9页
鲁西地区是中国东部重要的铁矿集区,其中BIF型铁矿成矿地质条件优越。本文通过梳理研究区成矿地质背景、地球物理特征及该类型铁矿床时空分布特征,并综合研究其赋矿地层特征的基础上,对该类型铁矿床地层赋矿规律、构造控矿规律、岩浆岩... 鲁西地区是中国东部重要的铁矿集区,其中BIF型铁矿成矿地质条件优越。本文通过梳理研究区成矿地质背景、地球物理特征及该类型铁矿床时空分布特征,并综合研究其赋矿地层特征的基础上,对该类型铁矿床地层赋矿规律、构造控矿规律、岩浆岩控矿规律和物探异常示矿规律进行深入剖析。研究表明该区BIF型铁矿成矿时代为新太古代,且具有多个铁矿赋矿层位,其中泰山岩群雁翎关组、山草峪组、柳杭组和济宁岩群颜店组均为主要赋矿层位;该类型铁矿构造控矿特征明显,尤以向形构造处铁矿富集现象最为显著;岩浆岩活动对该类型铁矿具有早期提供成矿物质来源和晚期进行矿体改造的作用;物探异常(如重磁异常)对于该类型铁矿勘查具有明显的指示作用。并在区内圈定了沂源县韩旺、苍峄铁矿带、东平—汶上、济宁市北等20处铁矿找矿靶区,表明鲁西地区BIF型铁矿勘查潜力巨大;研究表明该类型铁矿勘查方向在其已有矿床深部和边部进行勘查开发仍是首选地段,在隐伏区和低缓异常区利用深部钻孔进行勘查并开辟新的找矿空间是鲁西地区今后BIF型铁矿勘查工作的重要方向。 展开更多
关键词 BIF型 铁矿床 控矿规律 找矿前景 鲁西 山东省
下载PDF
鲁西郗山—关帝庙地区碱性杂岩体微量元素地球化学特征及其意义
17
作者 王巧云 郝兴中 +4 位作者 兰君 王立功 陈磊 郭晶 胡创业 《山东国土资源》 2024年第3期23-32,共10页
本文在详细的岩相学观察基础上,分析研究岩体和矿物的微量元素及稀土元素的特征。结果表明,郗山—关帝庙碱性杂岩体富集Ba、U、Pb、Th及La、Ce,亏损Nb、Ta、Zr、Hf;Nb>Ta,富集轻稀土元素、亏损重稀土元素,轻重稀土分异显著,Ce、Eu无... 本文在详细的岩相学观察基础上,分析研究岩体和矿物的微量元素及稀土元素的特征。结果表明,郗山—关帝庙碱性杂岩体富集Ba、U、Pb、Th及La、Ce,亏损Nb、Ta、Zr、Hf;Nb>Ta,富集轻稀土元素、亏损重稀土元素,轻重稀土分异显著,Ce、Eu无明显异常,关帝庙岩体与郗山岩体的微量元素配分曲线均为右倾型,表明研究区内碱性岩体为同源岩浆,推测初始成岩物质来源于岩石圈地幔部分熔融,其母岩浆为碳酸盐化硅酸岩熔体。郗山岩体发现岩浆型磷灰石和热液型磷灰石,表明郗山岩体的岩浆经历了较强的结晶分异和一定程度的混合作用,并在热液阶段形成大量的轻稀土矿物。 展开更多
关键词 微量元素 岩浆结晶分异 岩浆—流体作用 郗山—关帝庙 鲁西
下载PDF
鲁西泰安地区~2.7Ga变玄武岩成因及其对新太古代花岗-绿岩带构造演化的制约 被引量:1
18
作者 张家辉 相振群 +5 位作者 施建荣 初航 张健 陈春晖 丁海洋 李怀坤 《岩石学报》 SCIE EI CAS CSCD 北大核心 2024年第11期3336-3362,共27页
鲁西地区保存有华北克拉通最典型的新太古代花岗-绿岩带,且后期地质作用改造较弱,是探讨早期地壳形成演化的关键地区。最近的地质调查工作,在泰安地区识别出一套变玄武岩组合。通过锆石U-Pb定年,获得侵入变玄武岩的奥长花岗岩脉年龄为27... 鲁西地区保存有华北克拉通最典型的新太古代花岗-绿岩带,且后期地质作用改造较弱,是探讨早期地壳形成演化的关键地区。最近的地质调查工作,在泰安地区识别出一套变玄武岩组合。通过锆石U-Pb定年,获得侵入变玄武岩的奥长花岗岩脉年龄为2717±10Ma、二长花岗岩脉年龄为2549±15Ma,并在变玄武岩中获得~2729Ma、~2596Ma和2553~2549Ma多期年龄信息,由此确定变质玄武岩形成年龄大于~2.72Ga,遭受新太古代晚期~2.60Ga和~2.55Ga构造热事件影响。泰安地区变玄武岩组合归属于新太古代早期的泰山岩群雁翎关岩组。这些玄武岩遭受了后期(~2.55Ga)花岗质岩浆侵位作用的影响,并在原岩岩浆演化过程中经历了橄榄石和单斜辉石的结晶分离。变玄武岩为拉斑质玄武岩,显示出原始地幔一致的微量元素组成(Nb/Y=0.08~1.14、Nb/Th=1.82~13.4、Zr/Nb=17.9~27.2),表现为近平坦或弱分异的稀土元素配分模式[(La/Yb)N=0.90~2.52]和平坦的重稀土配分模式[(Gd/Yb)N=1.04~1.23];具有低的Sm/Yb比值(0.95~1.25)和正的εNd(t)值(2.48~3.64)。区域上,雁翎关岩组变玄武岩主要伴生科马提岩,成分均一,无伴生陆源沉积物,微量元素组成上与洋底高原玄武岩特征类似,来源于地幔柱头部尖晶石橄榄岩的部分熔融。新太古代早期(~2.7Ga),鲁西地区出现由科马提岩和拉斑玄武岩组成的绿岩带,同期出现新生的TTG陆壳,形成于地幔柱构造体制;新太古代晚期(~2.5Ga)出现钙碱性火山岩、TTG、赞岐岩和富钾花岗岩组合,显示出强烈的壳-幔相互作用和地壳物质再循环,板块构造体制已开始作用。综合地质资料揭示,华北克拉通构造体制在新太古代发生重大转变:由早期地幔柱逐渐转变为晚期的板块构造体制。 展开更多
关键词 花岗-绿岩带 新太古代 地球化学 泰山岩群 鲁西
下载PDF
鲁西韩旺BIF铁矿的形成时代——锆石SHRIMPU-Pb定年证据
19
作者 王宇晴 单吉成 +4 位作者 董春艳 王世进 董津蒙 颉颃强 万渝生 《地球学报》 CAS CSCD 北大核心 2024年第6期903-912,共10页
鲁西地区太古宙表壳岩包括新太古代早期和晚期两期表壳岩,早期表壳岩主要由变质玄武岩-科马提岩组成,晚期表壳岩主要由变质火山岩-碎屑沉积岩和BIF(Banded Iron Formations)组成。韩旺铁矿位于鲁西的西北部,铁矿区内存在大量变质玄武岩... 鲁西地区太古宙表壳岩包括新太古代早期和晚期两期表壳岩,早期表壳岩主要由变质玄武岩-科马提岩组成,晚期表壳岩主要由变质火山岩-碎屑沉积岩和BIF(Banded Iron Formations)组成。韩旺铁矿位于鲁西的西北部,铁矿区内存在大量变质玄武岩-科马提岩,早期认为该BIF形成于新太古代早期,而新的研究认为鲁西地区BIF都形成于新太古代晚期。本文对韩旺铁矿区内与BIF互层的黑云变粒岩和侵入其中的片麻状花岗闪长岩开展锆石SHRIMP U-Pb定年,获得年龄分别为(2529±7)Ma和(2534±11)Ma。黑云变粒岩和片麻状花岗闪长岩的TREE、(La/Yb)N、Eu/Eu*分别为76×10^(–6)、19.8、0.84和82.7×10^(–6)、17.3、1.14,它们的岩浆锆石的εHf值、单阶段Hf同位素模式年龄分别为5.5~9.46、2.5~2.6 Ga和6.3~9.4、2.48~2.60 Ga。研究支持了鲁西地区BIF形成于新太古代晚期的认识。表壳岩形成、变质变形和花岗闪长岩侵入发生在一个很短的时间范围内。研究还表明,黑云变粒岩的原岩为英安质火山岩,很可能形成于新生玄武质岩浆的强烈结晶分异作用,花岗闪长岩形成于新生玄武质岩石部分熔融,形成过程中有陆壳物质的加入。 展开更多
关键词 BIF 韩旺铁矿 鲁西 太古宙 锆石SHRIMP U-Pb定年
下载PDF
鲁西地区中生代高镁闪长岩角闪石成分变化特征及其对矽卡岩型铁矿成矿作用的启示
20
作者 郭军 黄小龙 +2 位作者 贺鹏丽 陈林丽 钟军伟 《大地构造与成矿学》 EI CAS CSCD 北大核心 2024年第4期800-819,共20页
矽卡岩型铁矿床是我国最重要的铁矿床类型之一,在华北克拉通东部广泛发育,时空上与中生代高镁闪长岩体紧密伴生,研究其物质来源和成岩成矿过程具有重要的意义。本文对鲁西地区与金岭铁矿床具有成因联系的中生代高镁闪长岩中的角闪石进... 矽卡岩型铁矿床是我国最重要的铁矿床类型之一,在华北克拉通东部广泛发育,时空上与中生代高镁闪长岩体紧密伴生,研究其物质来源和成岩成矿过程具有重要的意义。本文对鲁西地区与金岭铁矿床具有成因联系的中生代高镁闪长岩中的角闪石进行了详细的成分研究,限定高镁闪长岩的岩浆演化过程及其物理化学条件变化,探讨高镁闪长岩的岩石成因机制及其与矽卡岩型铁矿床成矿作用之间的联系。金岭高镁闪长岩的角闪石斑晶边部与基质角闪石具有一致的主量元素成分,记录了相似的T-P-fO_(2)-H_(2)O条件,显著不同于角闪石斑晶核部。角闪石斑晶核部的平衡岩浆来源于地幔部分熔融,而角闪石斑晶边部与基质角闪石的平衡岩浆中则存在地壳组分的贡献。高镁闪长岩-矽卡岩型铁矿床体系为极其复杂的成岩成矿系统,起源于高氧逸度和高水含量的地幔源区,并经历了包括结晶分异、同化混染、岩浆混合以及流体出溶、迁移和淋滤在内的诸多复杂岩浆热液演化过程。这些源区特征和岩浆-热液过程记录了不同深度岩石圈对华北克拉通破坏的构造响应。 展开更多
关键词 矽卡岩型铁矿床 高镁闪长岩 角闪石 鲁西地区 华北克拉通
下载PDF
上一页 1 2 13 下一页 到第
使用帮助 返回顶部