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山西义兴寨金矿床是五台山-恒山金矿集区内最为典型的金矿床,也是山西省最大的金矿床.矿区产出有4个角砾岩筒,与金矿的形成具有紧密的联系.然而,有关该矿床角砾岩筒的形成时间和机制的研究十分欠缺,角砾岩筒与金矿化的关系仍不清楚.通过对角砾岩筒内的矽卡岩角砾中的石榴石和切割角砾岩的石英斑岩中的锆石开展了LA-ICPMS原位U-Pb同位素分析,结果表明角砾岩和石英斑岩的形成时间分别为140±2 Ma和141±1 Ma,从而精确限制了角砾岩筒的形成时间.以上研究表明,义兴寨矿区4个角砾岩筒的形成时间与石英斑岩侵位时代和金矿形成时间完全一致,表明角砾岩筒是岩浆分异的气液流体导致围岩发生隐爆而形成,而金矿化也可能与岩浆释放的热液流体直接相关. 相似文献
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水银洞金矿床曾被认为是滇黔桂地区最有代表性的微细浸染型金矿(卡林型金矿),然而矿床的金品位明显高于一般意义上的卡林型金矿床,且金矿体与气液爆破角砾岩关系密切.气液爆破角砾岩呈垂直筒状产状,两侧断裂矿化带呈向上扩张的"喇叭口"状成矿空间,富金矿体紧密围绕角砾岩筒分布.根据野外和显微镜观察,角砾岩块成分复杂与显著磨圆.气液角砾岩筒的角砾岩显著富集金、稀土、亲地幔过渡元素Ti、Cr、Ni、Co、V等,以及Zr、Hf等,明显地区别于围岩,反映出深源流体快速上升的气液爆破角砾岩的特征,角砾岩筒实际上具备含金成矿流体的上涌通道的功能.岩筒中早期角砾岩的角砾含Au达18×10–6,属于深部金矿体的爆破碎块,显示出水银洞金矿床可观的深部找矿勘探前景. 相似文献
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澳大利亚基斯顿角砾岩筒型金矿床成矿地质地球化学特征位于澳大利亚昆士兰州北部汤斯维尔北西西约２８０ｋｍ的基斯顿（Ｋｉｓｔｏｎ）露采金矿是世界上最大的角砾岩筒型金矿之一．因为角砾岩化、成矿作用与流纹岩侵入作用具有密切的时空联系,对一个富金的次火山岩角砾岩... 相似文献
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山东平邑卓家庄金矿地质特征及成矿预测 总被引：7，自引：3，他引：4
平邑卓家庄金矿是隐爆角砾岩型金矿床 ,以高金品位 (平均在 10 0× 10 -6以上 )、全筒式矿化为特点。岩筒产于NW向和EW向断裂交汇部位。金矿矿石类型主要为隐爆角砾岩型矿石、震碎角砾岩型矿石、碎裂岩型矿石 ,隐爆角砾岩型矿石可进一步划分为矿浆胶结角砾岩型矿石、热液胶结角砾岩型矿石、岩浆胶结角砾岩型矿石及凝灰质胶结角砾岩型矿石。矿体上部矿石类型简单 ,下部矿石类型复杂。提出了卓家庄式隐爆角砾型金矿的找矿标志 ,认为Ⅱ、Ⅳ号角砾岩筒是有利金成矿的岩筒。 相似文献
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冀东唐杖子金矿:一个典型的隐爆角砾岩型金矿 总被引：1，自引：0，他引：1
根据唐杖子金矿矿区野外观察和勘探结果发现,北东向深断裂F2、F3控制了辉绿岩-花岗斑岩组成岩浆带,在与近南北向断裂F1交汇处,岩浆气液活动增强,形成明显的隐爆角砾岩筒,从中心向外侧依次出现中心角砾岩带→崩塌角砾岩带→震碎角砾岩带的分带特征。在角砾岩筒南西侧的主断裂带(F2、F3)内,热液聚集形成含金黄铁矿石英脉,脉体规模大(长约3000多米,宽约25m),含金品位高(金品位最高45g/t,最低3.6g/t,平均8.44g/t),构成唐杖子金矿的主矿体;在角砾岩筒北侧的弧形断裂(F5~F17)和南侧的放射状断裂(F18~F22、F23~F27)中,也有不同程度的热液聚集,形成含金石英脉,Au品位一般在1.82g/t。由主断裂带、侵入岩带控制的爆破角砾岩带及其派生的含金断裂系统,靠近岩筒的脉体中,硫化物发育,含金品位高;随着离爆破角砾岩筒距离的增大,断裂系统中的硫化物逐渐减少,金品位逐渐降低,整体构成一个典型的爆破角砾岩筒型金矿。角砾岩筒型金矿的识别,对华北地台的相似背景区的金矿勘探和地质研究有借鉴意义。 相似文献
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用坑道直流电法圈定祁雨沟角砾岩筒型金矿富集带及其产状 总被引：2，自引：1，他引：2
祁雨沟角砾岩筒型金矿矿体，应用坑道直流电法，以赋矿空间趋势的“低电阻寓所“概念，使充电法在立体空间上查明了矿体宏观产状。依据金与黄铁矿正相关规律，用自电、激电、视电阻率三法配合，间接指出金矿富集地段，并有三处已被新开拓的坑道证实。 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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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献
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正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37 相似文献
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正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.) 相似文献