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额仁陶勒盖银矿床地质特征及找矿标志 总被引：4，自引：0，他引：4
内蒙古额仁陶勒盖银矿床是我国近年来发现的大型中低温热液型矿床。矿体呈脉产于上侏罗统塔木兰沟组火山岩中，矿化与燕山晚期花岗岩演化晚阶段的浅成侵入体－石英斑岩有关。阐述了矿床地质特征、原生异常特点等，并提出了找矿的地质地球化学标志。 相似文献
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吉林抚松西林河银矿床是吉林东部近期发现和评价的产于太古宙古花岗岩和元古宙大理岩接触带的中低温热液矿床.矿床位于龙岗断块北东端韧性断裂带中,矿体产状受韧性断裂控制,矿体形态主要为脉状并具有分支复合、尖灭再现等变化.矿石结构主要有自形-半自形结构、他形粒状结构、包含结构、填隙结构、压碎结构、内部解理结构、乳滴结构、侵蚀结构.矿石构造主要为细脉状构造、稀疏浸染状构造、块状构造、角砾状构造.矿石中金属矿物有辉银矿、锑银矿、自然银、黄铁矿、方铅矿、闪锌矿、黄铜矿、黝铜矿、铜蓝、辉锑矿等.矿石中非金属矿物主要为石英、绢云母及方解石、绿泥石.矿床成因类型为岩浆期后中低温热液充填型银矿床,主要控矿因素为构造、岩石地层和岩浆岩. 相似文献
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鄂西北许家坡金银矿床石英流体包裹体研究 总被引：1，自引：1，他引：0
在前人工作的基础上,主要根据沿片理形成的矿石与脉状矿石中石英流体包体的明显差异和后者流体包裹体Ｒｂ－Ｓｒ等时线年龄为（８６±１．４）Ｍａ,提出了该矿床经历了两次和作用,燕山晚期脉状矿体叠加在前人提出的印支期沿片岩片理形成的矿体之上,为多期复成中－低温热液矿床。 相似文献
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福安赤路钼矿产于燕山晚期第四次侵入似斑状中细粒花岗岩及晚侏罗世赤水组上段流纹质晶屑凝灰熔岩接触带上,内带矿体呈似层状、透镜状,外带矿体呈脉状。区内花岗岩是在早白垩世中酸性-酸性系列岩浆喷发之后,在燕山晚期第四次入侵,经长期分异演化的超酸性花岗岩;钼矿的成矿时间在花岗岩形成之后,正长斑岩形成之前。综合分析矿床成矿地质背景和地质特征,认为该矿床为岩浆期后中高温热液型。 相似文献
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云南沧源拱丁金多金属矿床产于耿马花岗岩西接触带内带的构造破碎带中,矿体呈脉状,形态单一。矿石和脉石矿物的S、Pb同位素、流体包裹体的均一温度和成矿流体成分的分析结果表明,成矿流体来源于天水和岩浆流体的混合,成矿组分主要是从元古界地层中萃取的,但也包含有岩浆热液携带的深部成矿物质。成矿温度为217~353 ℃,属于中高温热液矿床。根据矿床的空间分布、围岩蚀变类型以及成矿时代分析,提出燕山晚期中酸性岩脉发育地段,特别是闪长玢岩岩脉群分布地段以及耿马花岗岩体与元古界西盟群王雅组接触带内带的构造破碎带,是重要的找矿标志和找矿方向。 相似文献
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广西隆安县凤凰山银矿床位于南华准地台的西南部西大明山隆起的北翼东端，矿体赋存于北西向断裂破碎带，以脉状、似层状产出于寒武系黄洞口组砂岩、粉砂岩、粉砂质泥岩中，成因类型为中低温岩浆热液充填交代型银矿床。银主要赋存于深红银矿、辉锑银铅矿等９种银矿物中，属独立的大型银矿床。 相似文献
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通过对牛圈银(金)矿床的细粒花岗岩、隐爆角砾岩、同位素特征等方面研究,笔者认为与矿床关系密切的隐爆角砾岩(次火山岩)由基底岩石的部分重熔形成,而成矿物质来源于下地壳-上地幔重熔岩浆;成矿热液为重熔岩浆分异演化形成的富气相流体。这些热液与次火山岩浆相伴或滞后上升,经多次隐爆作用在破碎带中形成矿床。银矿体呈脉状产出于粗粒花岗岩之破碎带中,含矿岩石为隐爆角砾岩。熔浆物质既成角砾又呈胶结物,成矿带发育中低温热液蚀变。矿床为含矿凝灰岩(英安质)熔浆经隐爆作用形成的浅成中低温热液矿床。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 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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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 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