2013年夏季千里岩岛水产种质资源保护区浮游生物的生态特征

分析了2013年7月千里岩岛水产种质资源保护区海域浮游生物的种类组成、数量分布、优势种类、生态类型与物种多样性等生态特征参数。共发现浮游植物21种,由硅藻和甲藻组成,平均丰度为2.29×104个/m3,角毛藻为主要优势种类,生态类型以温带近岸性和广温、广布性沿岸种为主。浮游动物19种,包括桡足类、枝角类、端足类、樱虾类、毛颚类和各种浮游幼虫。丰度均值为146.90个/m3,平均生物量为6.44 mg/m3,桡足类和毛颚类为优势类群,生态类型以温带近岸种为主。与2012年同期调查数据相比,浮游生物的种类数量与丰度均有增大,群落结构趋于稳定。

2015年秋季千里岩岛海域浮游植物群落结构特征

【目的】为了了解千里岩岛附近海域浮游植物状况。【方法】以2015年秋季在该海域的监测数据为基础,并结合2013年调查数据,分析该海域浮游植物的变化情况。【结果】2015年秋季千里岩岛海域发现浮游植物37种,由硅藻和甲藻组成,平均密度为3.23×105个/m3,监测区主要的优势种为圆筛藻(Coscinodiscus sp.)和虹彩圆筛藻(Coscinodiscus oculusiridis),多样性指数为2.13~3.42,平均为2.74。【结论】与2013年调查数据比较,千里岩岛海域浮游植物种类数、密度和多样性指数有所增长,分析原因可能是由于调查季节不同。

千里岩岛西部人工鱼礁建设对周边海域水动力影响的数值模拟

通过建立Mike21FM模型,对千里岩西部人工鱼礁建设区域及周围海域的水动力情况的数值模拟进行研究,分别选取工程前后的涨急时刻和落急时刻的潮流流速进行求差,得出2个时刻的潮流流速变化等值线与分布范围。并选取720 h进行欧拉余流计算,对工程前后的余流流速进行求差,由此得出余流在工程建设后的变化情况。由此研究工程建设对周围海域水动力情况的影响,进而对鱼礁区选址的合理性,营养盐的流失或富集区域及水质的研究提供参考。研究表明,工程建设产生的阻流效果在工程内部区域可达0.4 m·s^(−1);涨急时刻潮流流速增大的区域位于工程区域南北两侧,>0.05 m·s^(−1)面积约4.52 km^(2);涨急时刻潮流流速减少的区域分布于工程区域东西两侧,流速减少超过0.05 m·s^(−1)的面积约4.28 km^(2);工程区域内部余流流速减少均值在0.01 m·s^(−1)左右,工程区域外周边海域余流流速整体增大,最大增值超过0.1 m·s^(−1)的区域出现于工程东部,面积0.41 km^(2)。

节点和岩岛对河口分汊的影响

本文主要论述作为先成边界条件的节点(包括矶)和岩岛对河口分汊的影响.指出节点和矶的分布和性质对河口能否形成分汊以及分汊形态等具有不容忽视的作用。表明单个节点易形成喇叭状的少汊河口,多个节点则易导致藕节状展宽及分汊河口,而节点位于口门,则不利于河口展宽而使得河口难以分汊。在研究河口岩岛对河口分汊的作用时,分别从珠江口、韩江口和闽江口三个分汊河口,分析了岩岛的数目多少、规模大小和分布状况,对导致河口形成不同分汊模式的影响。

黄海海域千里岩岛发育榴辉岩

1982—1983年,山东省地质局第八地质队与第一水文地质队组成的海岛调查组,在位于东经121°23′与北纬36°16′的千里岩岛上发现了榴辉岩(图1)。据资料分析,榴辉岩的围岩为花岗质糜棱岩及白云石英糜棱片岩.面理产状为150°∠60°,榴辉岩呈较小的透镜体及扁豆体状顺面理产出,镜下鉴定的主要矿物组合为绿符石+石榴石+白云母+角闪石+绿帘石,微量矿物以金红石为主,其地质特征与荣成大疃一带的榴辉岩相似。另外。

千里岩岛海域浮游植物种类组成及群落结构特征

通过2019年11月(秋季)和2020年5月(春季)千里岩岛附近海域两个航次的网采浮游植物调查,共鉴定浮游植物53种,其中硅藻门42种,占79.2%;甲藻门10种,占18.9%;金藻门1种,占1.9%。秋季优势种包含11种,伏氏海线藻(Thalassionema frauenfeldii)为第一优势种;春季优势种包含6种,夜光藻(Noctiluca scientillans)为第一优势种。秋季浮游植物细胞密度平均值为1.27×105 cell/m3,显著高于春季的0.43×10^4 cell/m3(P<0.01)。千里岩岛附近海域浮游植物细胞丰度较高,这可能是由于陆地营养盐经地表径流输入而促进近岸海域浮游植物的繁殖生长。2019年秋季千里岩岛近岸海域浮游植物的多样性、均匀度和丰富度指数低于离岸海域;2020年春季千里岩岛西北侧调查站位极低的多样性、丰富度和均匀度指数是由于夜光藻的大量繁殖引起的。秋季的多样性和丰富度指数显著高于春季(P<0.01),但均匀度指数在两季间无显著差异(P>0.05)。

南黄海千里岩岛-灵山岛地质特征和盆地油气

简介了"十二五"国家海洋地质保障工程专项,相关项目针对南黄海这一中国海域唯一未获工业油气流,发现大型含油气盆地实施系统地质调查和研究的部分成果.发现了千里岩岛陆陆碰撞大剖面和出露金红石榴辉岩椭圆形核心区剖面,指出南黄海前陆盆地形成导源于中三叠纪华北-扬子板块陆陆碰撞拼贴,在延迟3~5千万年后,沉积形成于侏罗纪;阐明它与经典前陆盆地在构造单元、分布特征等方面的区别.揭示灵山岛之所以成为中国北方第一高岛的地质构造年代学特征与动力学机制;南京幕府山寒武纪和安微巢湖二叠纪栖霞组臭灰岩优质烃源岩和同为储集岩的认识.指出南黄海盆地千里岩隆起代表扬子板块北界,西接苏鲁-大别,东连韩国京畿地块而区别于胶北高压高温变质岩系;南黄海前陆盆地极具潜在油气发现潜力.

印度尼西亚布敦岛天然岩沥青溶剂抽提工艺研究

对岩沥青进行了资源分析与利用现状评价,针对印度尼西亚布敦岛天然岩沥青矿开发了一种溶剂抽提岩沥青生产石油沥青和燃料油的新工艺,并探讨了该工艺的技术经济可行性。对不同含油率的沥青样品采用不同溶剂进行抽提,进行了抽出油实沸点蒸馏、沥青指标分析和不同样品掺兑等实验,确定了溶剂抽提工艺方案。结果表明,选择合适的溶剂和馏程分配,能得到燃料油和石油沥青,所得沥青的软化点、针入度、延伸度等指标达到北美岩沥青技术指标要求。

岩岛兵工厂VRBP-100无托半自动霰弹枪

近年来,半自动霰弹枪的可靠性得到大幅提升,价格适中,需求量有所上升。以生产M1911手枪小有名气的岩岛兵工厂迎合半自动霰弹枪的市场需求,从土耳其引进一款无托半自动霰弹枪VRBP-100,企图占据更多市场份额——霰弹枪以强大的火力而闻名,除了打猎或娱乐射击外,其优秀的近战战术性能也赢得人们的一致认可。而无托结构布局在保证火力和威力的前提下,全枪尺寸更加紧凑,战术气息更加浓厚,VRBP-100霰弹枪就是这类产品的典型代表。

榆林地区奥陶系马五5亚段白云岩成因研究

鄂尔多斯盆地奥陶系中组合马五；亚段白云岩是继靖边奥陶系风化壳气藏成功勘探以来的又一重要碳酸盐岩勘探领域，目前靖边西侧南北向厚层、带状展布的马五。亚段白云岩勘探效果良好。已经形成近千亿立方米的储量规模，而盆地东部榆林地区马五，亚段白云岩呈孤立岛状分布，其形成机理及分布规律制约着对该区白云岩体的钻探及综合研究。通过岩心和薄片观察，发现孤立岛状白云岩体与其之间的石灰岩沉积组构明显不同，前者的形成更多反映了有生物活动的参与。形成一些生物丘。后者更多反映了一种干旱气候条件下的机械或化学沉积。参考现今新近系生物岛礁石灰岩能大规模云化的事实，将研究区马五。亚段碳酸盐岩与中国南海西沙群岛西琛l井新近系碳酸盐岩的地球化学特征进行了对比．发现两类白云岩较石灰岩均具有碳氧同位素正偏、锶含量偏低及海水盐度较大的特征，从而认为其云化环境可能具有相似性。都是在沉积期后高盐度的海水环境下发生的白云石化．

班公湖——怒江结合带改则地区洋岛组构模式与找矿重大发现——据西藏改则县1:5万I45E021005等六幅区调

西藏改则县1∶5万六幅区域地质矿产调查为班公湖—怒江成矿带地质矿产调查计划项目的子项目,项目研究区位于成矿带的西段。重新厘定了区内地层,将测区岩石地层划分为8组、16个段;进一步将区内划分残留海盆沉积区—蛇绿混杂堆积带—构造混杂岩带—洋岛—海山火山岩带—陆缘海盆沉积区—裂陷盆地—火山岩带—早期残留盆地沉积区的"七维一体"构造相组合;对区内原仲岗洋岛进行解体,发现洋岛组合"二层、三层结构",重新厘定了蛇绿混杂岩,发现了舍拉玛铜金多金属矿、洞措北镍金属矿2处矿产地。

苏鲁–大别高压变质带东北向延伸及地质演化探讨

位于中国黄海北部青岛以东约80 km的千里岩岛发育有透镜状和层状榴辉岩。通过千里岩岛与中国苏鲁大别造山带两地榴辉岩在矿物特征、形成年代、变质峰值温压条件等地质环境方面的对比,表明千里岩岛是苏鲁大别造山带海上的延伸。根据岩相学和矿物学研究千里岩岛榴辉岩主要经历了三个变质阶段:以榴辉岩中Grt-Omp-Ph-Rt矿物组合为标志的第一变质阶段,T = 775℃,P = 2.6 GPa;以取代绿辉石的Amp + Ab后成合晶结构为标志的第二变质阶段,T = 740℃~790℃,P = 1.60~1.75 GPa;以出现阳起石,进入绿片岩相阶段为标志的第三变质阶段。千里岩岛榴辉岩的变质年代约为222 Ma的晚三叠世,与苏鲁–大别造山带榴辉岩变质年代一致。推测千里岩岛是苏鲁大别造山带东向海上的延伸,并且是韩国洪城与中国苏鲁大别造山带之间的连接部分。

Zircon U-Pb age,geochemical and Nd isotopic data of Middle Jurassic high-Mg dioritic dike in Liaodong Peninsula,NE China

Zircon LA-ICP-MS U-Pb age, geochemical and Nd isotopic data are presented for a newly recognized high-Mg dioritic dike from Haicheng, Liaodong Peninsula, NE China, to constrain its petrogenesis. The zircons from the high-Mg diorite exhibit striped absorption and oscillatory growth zoning in the cathodoluminescence （CL） images, and have high Th/U ratios （0. 05-0.9）, indicating a magma origin. Zircon LA-ICP-MS U-Pb dating indicates that 206pb/238U ages of 12 spots of zircons are between 167 Ma and 178 Ma, yielding a weighted mean 206pb/238U age of 172 ＋ 2 Ma （MSWD =4. 1 ）, which represents the forming age of the high-Mg dioritic dike, i. e. Middle Jurassic. Geochemically, the samples have SiO2 =55.4-60. 6 wt. % , Na20 =2. 2-2.76 wt. % , K20 = 1.32-2. 02 wt. % and （Na2O ＋ K2O） =3.82--4. 47 wt. %, belonging to sub-alkaline series and displaying a calc-alkaline evolutionary trend. They are characterized by high MgO （4. 75-6.85 wt. % ）, Mg# （55-61）, Cr（130-262 ppm）, Ni（63-130 ppm）, Sr（568-857 ppm）, and Ba（484-1 130 ppm） contents, with geochemical features analogous to those of high-Mg adakites. They show variable end （t） values （ - 1.3 to - 3.9） , with a weighted value of - 2. 7, which plot intermediately between the field of the ancient continental crust and the depleted mantle source, indicating that both the lower crust and mantle source are necessary for the generation of the parent magma of the Haicheng high-Mg diorites. The Haicheng high-Mg dioritic dike in the Liaodong Peninsula and the Jurassic magmatism in the eastern North China Craton formed under a continental crustal thickening setting that may be related to subduction of the Paleo-Pacific oceanic plate.

Geomorphosites in Granitic Environments： An Example from Northern Sardinia （Italy）

A rare geomorphosite and a pillow-like structure appearing as mingling structures due to that mafic and acidic magma interactions are described. Despite the occurrence of spectacular forms in the granitic basement of Sardinia, the morphosites of geological interest linked to the complex evolution of pluton emplacement are still poorly understood. The Fizza Ona outcrop, located near the northeastern coast, is a good example of a geomorphosite in the inner zone developed at the edge of different plutonic units. This outcrop is a well-exposed, pillow-like horizon of less than 5 m in thickness, observable in the field for at least 200 m and underlined by the occurrence of a large tafoni form. In detail, the pillow-like horizon consists of sub-roundly to sub-rounded elements of granitic to micropegmatitic rocks of up to 100 cm in diameter, which is dispersed in the fine-grained granitic host-rock matrix. The outcrop represents a particular example of the emplacement mechanism of granitic magmas in the Sardinian batholith. One aim of this work is the construction of a document for the competent authorities to protection and preservation of this outcrop as a cultural heritage for the history of the geological evolution.

Reconstructing Environmental Changes of a Coastal Lagoon with Coral Reefs in Southeastern Hainan Island

Coastal lagoons with small catchment basins are highly sensitive to natural processes and anthropogenic activities. To figure out the environmental changes of a coastal lagoon and its contribution to carbon burial, two sediment cores were collected in Xincun Lagoon, southeastern Hainan Island and (210) ~Pb activities, grain size parameters, total organic carbon(TOC), total nitrogen(TN), total inorganic carbon(TIC) and stable carbon isotopes(δ^(13)C) were measured. The results show that in 1770–1815, the decreasing water exchange capacity with outer open water, probably caused by the shifting and narrowing of the tidal inlet, not only diminished the currents and fined the sediments in the lagoon, but also reduced the organic matter of marine sources. From 1815 to 1950, the sedimentary environment of Xincun Lagoon was frequently influenced by storm events. These extreme events resulted in the high fluctuation of sediment grain size and sorting, as well as the great variation in contributions of terrestrial(higher plants, soils) and marine sources(phytoplankton, algae, seagrass). The extremely high content of TIC, compared to TOC before 1950 could be attributed to the large-scale coverage of coral reefs. However, with the boost of seawater aquaculture activities after 1970, the health growth of coral species was severely threatened, and corresponding production and inorganic carbon burial flux reduced. The apparent enhanced inorganic carbon burial rate after 1990 might result from the concomitant carbonate debris produced by seawater aquaculture. This result is important for local government long-term coastal management and environmental planning.

Petrogenesis of high-Mg# Cenozoic volcanic rocks of southern Qiangtang area, Tibetan Plateau： geochemical and Sr-Nd isotopic evidence

The Nadingcuo volcanic rock suite is the most volmninous Cenozoic volcanic suite in the southern Qiangtang area of the northern Tibetan Plateau. These high-K calc-alkaline volcanic rocks were formed between 36 and 34 Ma, characterized by high Mg# values, high concentrations of TiO2 and P205, 87Sr/S6Sr ratios of 0. 704682--0. 706 112, and aNd（t） values of - 1.2 to 1.6. There is a lack of reasonable explanations for sour- cing and origin of magmas that formed the rocks with high Mg# values and TiO2 and P2O5 enrichments, which makes the previous research results still controversial. This study reviews the geochemical characteristics of Nadingcuo volcanic rocks and the data we have newly found in our fieldwork. We give some new interpretation to the magmatic evolution of the basaltic magmas in the discussed area dominated by fractional crystallization. The geochemistry of trachyandesite and trachyte units in the studied area is indicative of formation from mantle- derived magmas that mixed with crustal materials. The high values of Mg# and TiO2 and P205 enrichment in these units are evident to show the mixing between mantle-derived magmas with -30-40 wt.% rhyolitic melt or assimilation of a similar amount of felsic rocks. The geochemistry of basaltic rocks in the area also suggests that the Nadingcuo basalts may have been derived from an ocean island basalt （OIB） -type source that contained and was mixed with ancient mantle wedge derived material, indicating that a 36-34 Ma asthenospheric upwelling e- vent in the Qiangtang area may relate to the northward subduction of Indian lithospheric mantle and the south- ward subduction of Asian lithospherie mantle. This upwelling of asthenospherie material was centered in the southern Qiangtang area between 36 and 34 Ma, while the northward movement of the Indian Craton caused this upwelling mantle flow to continuously migrate northward, resulting in the current centering of this upwelling in the Hoh Xil-Kunlun region.

Zircon SHRIMP U-Pb dating for island arc volcanic rock of Fangniugou area in Yitong region of Jilin Province

Polymetallic iron ore sulphate deposits of marine volcanic rock have been developed in the Fangniugou area,Jilin Province,China,but the division of volcanic ore-bearing strata has not been specifically elucidated and there is disagreement about the division.The sampling and SHRIMP U-Pb zircon dating of volcanic rock for Daheishan in the Fangniugou area and the northeast slope of the Duanjiadian were described.The volcanic rock formation period and recorded the volcanic events in the Daheishan mountains were systematically researched.Two samples of high-precision U-Pb zircon dating were used to represent the volcanic rock fomation period of the Late Silurian.The measured data reflect that multiple volcanic activities occurred during the Middle Silurian,Early Silurian,Middle Ordovician and Silurian,and Late Ordovician,probably matching volcanic events in the Songnan Basin identified from zircon dating.At the same time,it is confirmed that a controversial "conglomerate of Daheishan" did in fact develop in the Late Silurian,and those sections of both the Dazigou and Xinlitun-Taoshan with graptolite had been reversed.

LA-ICP MS Characteristic of Geochemical Composition of Veins Rocks from the Central Part of the Khibina Massive in Kola Peninsula, Northern Russia

This paper discusses the vein rocks located in the central part of Khibina Mts.. These rocks are located on the border of two zones： ore and external. In the ore, zone is present titanite-nepheline bodies whilst in the outer zone are massive-syenites ＂khibinites＂. The veins can be divided into： mikrosyenites, melteigites and other rock types （e.g., tinguaites）. The results of LA-ICP MS （laser ablation of inductively coupled plasma mass spectrometry） indicate that these rocks are associated with deep zones which formed as a result of injection of primary magma and contamination of fluids during migration, where there have hydrothermal processes. Rock-forming minerals, their corrosion and accessory minerals indicate these processes, too.

Late Mesozoic extensional tectonics of the Liaodong Peninsula massif:Response of crust to continental lithosphere destruction of the North China Craton

Unlike most Precambrian cratons that have thick sub-continental lithospheric roots,the Archean lithosphere beneath the North China Craton is thin (reduced from 200 km to about 80 km),and has been replaced by a geochemically juvenile lithospheric mantle.This is a unique regional geological event,which has attracted worldwide attention.In the North China Block,Late Mesozoic extensional tectonics is evident by low-angle detachment faults,syntectonic plutons bounded by ductile faults,metamorphic core complexes (MCC) and widespread Jurassic to Cretaceous half-grabens filled by continental terrigenous deposits and volcanic rocks.At a regional scale,these structures share the same NW-SE extensional direction,while maintaining their own individual kinematics.In other words,the MCC feature a top-to-the-NW sense of shear,and syntectonic plutons are typified by a top-to-the-SE shearing deformations.Geochronological results indicate that the extensional structures were formed between 130-120 Ma.These extensional events lead to magmatic rock emplacement,distributed at the footwall of the detachment faults.Two different exhumation stages can be identified based on regional structural and magmatic interpretation:a Jurassic slow or negligible exhumation and a Cretaceous fast one assisted by normal faulting.These two cooling stages correspond to distinct geodynamic processes that occurred during the Jurassic and Cretaceous.Extensional tectonics appear to have been insignificant before the Early Cretaceous,and the process may be demonstrated by partial melting of the crust.The second stage,dominated by an extensional regime,developed after ca 120 Ma,and is tentatively correlated with crustal extension caused by lithospheric removal of the North China Craton.

The formation mechanism of accretionary wedge at Karamay in West Junggar,NW China

Accretionary wedge is the typical product of subduction-zone processes at shallow depths. Determining the location, composition and mechanism of accretionary wedge has important implications for understanding the tectonism of plate subduction. The Central Asian Orogenic Belt （CAOB） is one of the world＇s largest accretionary orogenic belts, and records the bulk evolution of Paleo-Asian Ocean from opening to closure, with multi-stages and multi-types of crust-mantle interaction in the Paleozoic. West Junggar （western part of Junggar Basin）, located in the core area of CAOB, is characterized by a multiple intra-oceanic subduction system during the Paleozoic. In its eastem part crop out Devonian-Carboniferous marine sedimentary rocks, Darbut and Karamay ophiolitic m61anges, alkali oceanic island basalts, island arc volcanic rocks and thrusted nappe structure. Such lithotectonic associations indicate the occurrence of accretionary wedge at Karamay. In order to decipher its formation mechanism, this paper presents a synthesis of petrography, structural geology and geochemistry of volcanic rocks. In combination with oceanic subduction channel processes, it is suggested that the accretionary wedge is a composite melange with multiple stages of formation. The application of oceanic subduction channel model to the Karamay accretionary wedge provides new insights into the accretion and orogenesis of CAOB.