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新疆金山沟金矿床地质特征和成因 总被引:5,自引:0,他引:5
新疆金山沟金矿床赋存在下石炭统巴塔玛依内山组火山岩中,受火山机构的环状、放射状断裂及叠加的NE向断裂裂隙控制。蚀变发育,分为线型和面型两类蚀变带,进一步划分出成矿期前、成矿期和成矿期后3期蚀变。流体包裹体及氢、氧、碳、硫、铅同位素特征表明,参与成矿的碳为岩浆源和地层的混合碳,硫、铅来源于地幔,金等成矿元素来自火山岩,成矿溶液为大气降水与岩浆水的混合溶液。矿床成因应属浅成中低温火山岩型金矿。 相似文献
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安徽铜陵冬瓜山铜(金)矿床H-O-S-Pb同位素组成及其示踪成矿物质来源 总被引:9,自引:6,他引:3
冬瓜山铜(金)矿床中主矿体成层状,受石炭系层位控制,对于其物质来源尚存在较大分歧。为了查明冬瓜山铜(金)矿床成矿物质来源,本文对冬瓜山铜(金)矿床不同类型矿体的氢、氧、硫、铅同位素进行了系统地测定。并将冬瓜山铜(金)矿床与铜陵矿集区内典型矽卡岩型矿床的硫、铅同位素组成进行了对比研究。结果表明:冬瓜山铜(金)矿床不同类型矿体之间具有相同的物质成分来源,不同类型矿体的成矿流体主要来源于岩浆水,硫源均为岩浆硫,且与区域上典型矽卡岩型矿床的硫同位素组成一致,铅同位素特征表明,不同类型矿体铅的来源主要为与岩浆作用有关的幔源铅。 相似文献
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布敦化铜矿是大兴安岭中南段一个斑岩-热液脉型复合铜矿床,包括南部的金鸡岭斑岩型铜矿段和北部的孔雀山热液脉型铜矿段。本文在详细的矿床地质特征研究基础上,通过对矿体的氢、氧、硫和铅同位素系统研究,探讨了成矿流体和成矿物质来源以及成矿机制。氢、氧同位素组成表明,金鸡岭矿段与孔雀山矿段早期成矿流体主要以岩浆水为主,至成矿晚期有大气降水的参与。硫同位素分析结果表明金鸡岭矿段相对富集重硫,成矿热液的硫同位素组成为+2.54‰-+2.60‰。而孔雀山矿段相对富集轻硫,成矿热液的S同位素组成为-1.84‰--1.71‰,两矿段的硫同位素组成表明硫主要来源于地球深部,铅同位素组成则表明铅具壳幔混合的特点,其来源与岩浆活动密切相关。结合大兴安岭中南段区域地质演化历史认为,布敦化矿床两个矿段的成矿作用均是由流体混合而导致黄铜矿等金属硫化物的大量沉淀。 相似文献
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铲子坪金矿位于雪峰山构造岩浆岩带的白马山复式花岗岩体外接触带附近。本文通过对铲子坪金矿床岩石地球化学以及稳定同位素的研究,探讨其矿床成矿物质来源及矿床成因。研究结果表明:矿石中金属硫化物的δ34S介于-7.58‰~+0.32‰,平均为-2.44‰,富轻硫,表明硫化物中的硫主要来自花岗岩浆,有部分地层硫酸盐中的硫混入;铅同位素组成相对稳定,变化范围很小。根据铅构造模式图解和△γ-△β图解,铅同位素主要来源于地幔,有部分地壳铅的加入;氢、氧同位素表明成矿流体具有变质热液和岩浆热液的双重性,成矿晚期热液有大气水成分加入;碳同位素表明成矿流体与砂质板岩关系密切,与地幔或深部流体有一定的关系,矿床成矿流体中的CO2很可能为壳幔混合;锶同位素研究表明,铲子坪金矿床的(87Sr/86Sr)i组成特征与华南陆壳重熔性花岗岩初始岩浆水的(87Sr/86Sr)i组成特征基本一致,表明其成矿作用可能与岩浆热液有关。铲子坪金矿成因类型为岩浆热液型。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献