期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
关于建立斑岩型铜矿床勘查标识体系的初步探讨 被引量:7
1
作者 李莎莎 陈华勇 汪礼明 《大地构造与成矿学》 EI CAS CSCD 北大核心 2019年第5期991-1009,共19页
斑岩型铜矿床勘查标识体系,是建立在全球超大型.大型斑岩型铜矿床丰富研究成果和勘查经验基础上,凝炼不同矿床之间的共性和差异性来作为斑岩型铜矿床普适性标志和区分标准,探寻矿床特征与勘查方法之间的内在联系,最大程度结合科研成果,... 斑岩型铜矿床勘查标识体系,是建立在全球超大型.大型斑岩型铜矿床丰富研究成果和勘查经验基础上,凝炼不同矿床之间的共性和差异性来作为斑岩型铜矿床普适性标志和区分标准,探寻矿床特征与勘查方法之间的内在联系,最大程度结合科研成果,优选科学的勘查方案并给出评价依据,构建以地质事实→成矿机制研究→勘查方法应用“三位一体”的勘查标识体系。该体系架构分为矿床地质、矿床成因机制和勘查方法三个部分。建立斑岩型铜矿床勘查标识体系将有利于增进对斑岩型铜矿床的有效勘查。本文以特提斯.喜马拉雅成矿域的西藏驱龙斑岩型铜.钼矿床、环太平洋东段成矿域的智利ElTeniente斑岩型铜.钼矿床和中亚成矿域东部的蒙古OyuTolgoi斑岩型铜.金矿床三个超大型斑岩型铜矿床为例,重点对比勘查标识体系中矿床地质和致矿岩体地球化学特征,归纳提炼不同矿床之间的共性和差异,对构建斑岩型铜矿(床)勘查标识体系进行初步探讨。研究结果显示:产于不同构造环境下的三个斑岩型铜矿床中均发育钾化带、青磐岩化带和绢英岩化带;铜矿化在钾化带和绢英岩化带中均有发育,钼矿化更倾向于在含水蚀变如绢云母化带、石英.绢云母蚀变部位,金矿化赋存于钾化带发育部位;矿化中心向矿区外围硫化物具有斑铜矿→黄铜矿(+斑铜矿)→黄铁矿的分布规律,铜矿化和钼矿化相叠加,但高品位的铜钼矿体相分离。驱龙矿床未发育ElTeniente矿床和OyuTolgoi矿床共有的(高级)泥化蚀变,可能与其形成环境或剥蚀有关。在地球化学数据收集中,为了确保数据分析的有效性提出筛选方法和程序。岩石地化数据结果显示:致矿斑岩体主要由30%~50%斜长石斑晶和60%左右基质(石英、钾长石)组成,均为高钾钙碱性、过铝质、埃达克质岩石,具有相似的右倾型稀土元素配分模式;但是致矿岩体的硅碱成分、稀土元素配分模式、Sr-Nd同位素表现出与产出环境一致的变化规律,Sr/Y-Y图解显示ElTeniente矿床较驱龙矿床和OyuTolgoi矿床的致矿岩体表现出更典型埃达克岩特征。总之,斑岩型铜矿勘查标识体系的提出和以三个矿床为例的初步探讨为下一步构建该勘查体系奠定了一定的基础。 展开更多
关键词 型铜 勘查标识体系 蚀变化分带 地球化学
下载PDF
河南栾川伊源玉矿的成玉机制探讨
2
作者 杨炯 丘志力 +5 位作者 张跃峰 白洞洲 郑昕雨 叶旭 赖舒琪 霍志翔 《宝石和宝石学杂志(中英文)》 CAS 2024年第S01期81-82,共2页
河南栾川伊源玉矿是软玉和蛇纹石玉共生的玉矿点,目前栾川玉矿床的成因机制仍然存在争议,一种观点认为该矿归属于中低温条件下的镁质大理岩型^([1-3]);但另一种观点认为其蛇纹石玉为层控变质热液交代为主、重叠岩浆期后热液作用为辅的... 河南栾川伊源玉矿是软玉和蛇纹石玉共生的玉矿点,目前栾川玉矿床的成因机制仍然存在争议,一种观点认为该矿归属于中低温条件下的镁质大理岩型^([1-3]);但另一种观点认为其蛇纹石玉为层控变质热液交代为主、重叠岩浆期后热液作用为辅的多成因变质矿床^([4]),其软玉矿床属多期、多方式的中低温复合变质蛇纹岩型软玉矿床^([5])。本研究选取河南栾川赋存在上元古界栾川群煤窑沟组地层之中的蛇纹石玉,利用红外光谱、拉曼光谱、ICP-MS/LA-ICP-MS、同位素质谱仪等手段开展了多种岩矿地球化学方法的测试分析,研究发现:(1)栾川蛇纹石玉主要矿物为叶蛇纹石,蛇纹石玉矿脉与栾川的褶皱构造具有同生变形的特征,且有变辉绿岩切割玉矿体,显示其蛇纹石成玉时间应该在变辉绿岩之前;(2)栾川蛇纹石玉样品Ba、Sr、Zr、Hf、Nb等不相容元素亏损,流体活动性元素Th、U、Pb全部富集。Nb/Ta比值与大陆地壳的Nb/Ta比值(8~14)[6-7]较为接近,暗示了栾川蛇纹石玉成玉与后期地壳来源的流体有关。栾川蛇纹石玉ΣREE=1.06~7.96μg/g;LREE=0.72~6.13μg/g;HREE=0.73~2.16μg/g;轻稀土相对富集,LREE/HREE=2.12~4.06(均值3.03),δEu=0.44~1.51,负异常/正异常。无Ce异常,呈下凹型曲线。蛇纹石玉的微量和稀土元素特征表明,蛇纹石玉化与大理岩原岩和流体具有密切的联系[8];(3)稳定同位素特征显示,栾川蛇纹石玉的δD_(srp-H2O)和δ^(18)O_(srp-H2O)变化范围与大气降水、变质水及岩浆水的δD_(H2O)值和δ^(18)O_(H2O)值变化区间均有重叠,显示其成玉流体为混合来源,但其δ^(30)Si同位素只与硅质叠层石的范围较为一致,显示其Si的来源可能与元古代的硅质岩有较强的关联性;(4)区内的中部上元古界栾川群、下元古界桃湾群(Pt 1t)为主要含玉岩系,与栾川玉关系很密切的栾川群煤窑沟组以及下伏地层三川组,中元古代晚期蓟县纪的官道口群,主要为浅水的海滩相砂岩-浅水潮坪的叠层石大理岩[9],曾发生广泛的低绿片岩相到角闪岩相的变质作用,与玉脉呈密切接触的变辉绿岩锆石^(206)Pb/^(238)U年龄加权平均年龄为849.2±6.9 Ma(MSWD=2.2,n=19,1σ),据此,推测元古界的蛇纹石化及成玉应该是区域构造挤压褶皱产生过程中大气降水和变质热液与大理岩的变质反应有关;鉴于区内850 Ma的变辉绿岩脉切穿过该期蛇纹石玉,认为,该期蛇纹石玉以及下元古界桃湾群(Pt_(1t))成矿最晚时间不应晚于850 Ma。结合栾川蛇纹石玉主微量元素特征,变辉绿岩的年龄以及闪石玉的成矿时代等分析,本文认为栾川群煤窑沟组蛇纹石玉的成矿早于850Ma,更有可能为早期区域变质作用的产物。 展开更多
关键词 伊源玉 岩矿地球化学 成玉机制 栾川县
下载PDF
Geology and geochemistry of Huanggangliang stratabound skarn deposit in Inner Mongolia,China 被引量:2
3
作者 WANG Changming 《Global Geology》 2010年第2期61-69,共9页
Over the recent three decades, exploration of a large-size Sn-Fe polymetallic ore deposit at the Huanggangliang, the Da Hinggan Mountains, Inner Mongolia, China, has been largely focused on the premise that the minera... Over the recent three decades, exploration of a large-size Sn-Fe polymetallic ore deposit at the Huanggangliang, the Da Hinggan Mountains, Inner Mongolia, China, has been largely focused on the premise that the mineralization represents epigenetic magmatic hydrothermal ore deposit in genetic connection with the Mesozoic magmatism. The Huanggangliang Sn-Fe polymetallic ore deposits occurred in Permian strata, with silt- stone/marble of the Zhesi Formation and spilite/andesite/tuff of the Dashizhai Formation. The characteristics of geological and geochemical data demonstrated that sedimentary hydrothermal mineralization occurred during the basin evolution at the Permian, rather than representing epigenetie magmatic hydrothermal genesis with the following evidences. The ore-bearing skarus are stratiform with underlying metasedimentary rocks and overlying volcanic sedimentary rocks. Sedimentary hydrothermal textures and structures are observed in the stratabound ore-bearing skarn such as bedded-laminated skarn and magnetite ores with small-size folding or soft deforma- tion, synsedimentary breccia of skarn and magnetite ores and concentric shell structure of magnetite ores. So the stratabound ore-bearing skarns associated with magnetite ore and micro-disseminated tin, are peculiar examples of exhalite. The REE contents of the stratabound ore-bearing skarns display ∑LREE-rich (36.91×10^-6) but EHREE-depletion (6. 42 ×10^-6) , with positive Eu anomaly (Eu/Eu * 1.28) and negative Ce anomaly (Ce/ Ce * 0.88 ) , which is totally different from REE pattern of the Huanggang magmatic rocks( with ∑REE 277.73 ×10^-6, ELREE 220.24 ×10^-6, ∑HREE 57.49 ×10^-6, Eu/Eu* 0.06, Ce/Ce* 1.52) , which is comparable with modern sea-floor hydrothermal fluid,sedimentary hydrothermal ore deposit and associated hydrothermal sedimentary rocks. Calcite samples with δ13CPDB from -5. 400 ‰ to -4. 397 ‰ and δ18SOSMOW from 9. 095 ‰ to 9. 364 ‰ in the stratabound ore-bearing skarns show sedimentary hydrothermal genesis of the Huanggangliang deposit. This proposition is useful not only for interpretation of the genesis of the Huanggangliang large Sn-Fe polymetallic ore deposit but also significant for mineral exploration in the area especially for finding large deposits caused by sedimentary exhalative mineralization processes. 展开更多
关键词 stratabound skarn exhalative genesis REE carbon isotope Huanggangliang ore deposit
下载PDF
Petroleum systems in the Damintun Depression, Liaohe Oilfield
4
作者 ZHENG Li-hui XING Yu-zhong 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第11期1864-1871,共8页
There are two different types of oils—high-wax oil and normal oil—found in the Damintun Depression of Liaohe Oilfield after several years of exploration and development, but their distributions and origins had confu... There are two different types of oils—high-wax oil and normal oil—found in the Damintun Depression of Liaohe Oilfield after several years of exploration and development, but their distributions and origins had confused the explorers in the oilfield. The introduction of petroleum-system concept shifts the view of geoscientists from geology and geophysics to oil, gas and their related source rocks. After detailed study, two petroleum systems have been identified in the Damintun Depression: (1) the ES42-Ar buried hill petroleum system (called the high-wax oil petroleum system) and (2) the ES41+ES34-ES4 and ES3 petroleum system (called the normal oil petroleum system). Based on the detailed analysis of the basic components, and all the geological processes required to create these elements of the two petroleum systems, it is put forward that targets for future exploration should include the area near Dongshenpu-Xinglongpu and the area near the Anfutun Sag. This provides scientific basis and has theoretical and practical meaning for the exploration and development. 展开更多
关键词 Petroleum system Source rock Geochemical characteristics Hydrocarbon migration
下载PDF
Petrological characteristics,geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province,China
5
作者 张德贤 戴塔根 《Journal of Central South University》 SCIE EI CAS 2011年第4期1217-1225,共9页
The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit ... The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit porphyry, monzonite porphyry and granite porphyry. Petrological chemical analysis results suggest that silica is poor and aluminum is rich, and high potassium large ion lithophile elements (LILE), light rare earth element (LREE) and Sr are obviously detracted in these rocks. High field strength elements (HFSE) and heavy rare earth element (HREE) are depleted, especially Nb, Ta, P and Ti. 8Eu: 0.09--1.64 shows that plagioclase does not appear fractional crystallization during the formation of alkali-rich rocks, t^348, H and O isotopes and Pb isotopes suggest that ore-forming fluid is derived from the mantle, and Pb is possibly mixed by mantle, wall rock and crust. The age of Pb in alkali-rich rocks is about 250-220 Ma. The age of alkali porphyry rock (dykes) varies from 30 Ma to 50 Ma. Alkali rocks have strong metallogenetic relation. Au mineralization is associated to the alkali magrnatic activities with a relatively high temperature, low pressure and high oxygen fugacity. However, copper mineralization is mainly associated with alkali-sub-alkali magmatic activities in a process of relatively low temperature, high pressure and lower oxygen fugacity. 展开更多
关键词 alkali-rich porphyry rocks Sanjiang metallogenetic belt GEOCHEMISTRY metallogenetic relation
下载PDF
Geotechnogenesis problems
6
作者 Gueorgui A.Yurgenson 《Journal of Geoscientific Research in Northeast Asia》 2004年第1期92-96,共5页
Geotechgjgensis is mineralogical geochemical transformation of minerals, rocks, and ores as consequence of impact on them in the process of performing geological-exploration and irrigation works, extracting and proces... Geotechgjgensis is mineralogical geochemical transformation of minerals, rocks, and ores as consequence of impact on them in the process of performing geological-exploration and irrigation works, extracting and processing mineral resources, constructing transport, civil and military objects. These effects lead to discontinuity and moving different scale fragments of upper part of lithospere and conjugate hydro-and biosphere zones. Discontinuity predttermines the disturbance of matural systems dynamic equilibriu and acceleration ofmftter transformation and migration processes. The final aim of studying geotechnogenesis minseralogy and geochemistry is the establishment of scientific foundations for developing ecological safety measures including also utilization fo geotechnogene deposits. 展开更多
关键词 geotechnogenesis ENRICHMENT tailings dumps UTILIZATION Zabaikal
下载PDF
Geochemistry and genesis of magmatic PGE-bearing Cu-Ni sulphide deposit in Wadi Bayhan,southeastern Yemen
7
作者 Moteea A. Al-Shameery SUN Fengyue +1 位作者 M. Alqadasi M. Mattash 《Global Geology》 2011年第1期15-20,共6页
The Wadi Bayhan mafic-uhramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposit are located in the south margin of the Arabian-Nubian Shield, SW Yemen. The intrusions consist of du- nite, olivin... The Wadi Bayhan mafic-uhramafic intrusions associated with magmatic PGE-bearing Cu-Ni sulphide deposit are located in the south margin of the Arabian-Nubian Shield, SW Yemen. The intrusions consist of du- nite, olivine-pyroxenite, lherzolite, hornblendite, gabbro and gabbronorite. The dunite and lherzolite are the main host rock for the Cu-Ni ores. The new data of the chemical compositions of the rocks have SiO2 (50% - 53.6% ), AI203 (0-32%) and MgO (4%-28%), and relatively low TiO2 (0-3.2%) and K2 0 + Na20 (0. 04% - 5.2% ). The geochemical characteristics indicate that the parental magma is high-magnesium tholeiitic. Sulfur had reached saturation and immiscible sulfides droplets segregated from silicate magmas before their emplacement. 展开更多
关键词 magmatic sulphide Wadi Bayhan mafic-ultramafic intrusion
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部