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相山铀矿田巴泉隐爆角砾岩(筒)地质特征与铀成矿 总被引:1,自引:0,他引:1
巴泉铀矿床位于相山矿田的北部边缘,是典型的隐爆角砾岩(筒)型铀矿床。隐爆角砾岩(筒)是由与相山火山机构有密切联系的燕山晚期侵入于震旦系变质岩中的潜花岗斑岩岩枝发生隐爆作用而生成。矿床是多阶段岩浆活动、多次隐爆作用和多期铀成矿作用互为响应、连续发展地质过程的产物,是集岩浆岩体-角砾岩体-铀矿体为一体的综合地质单元。燕山晚期潜花岗斑岩浆和英安玢岩浆的侵入、隐爆作用形成的角砾岩(筒),以及断裂构造的频繁运动,对铀成矿乃至矿床的形态和规模起到重要的控制作用。隐爆角砾岩(筒)的形成具有脉动性、隐爆性,显示隐爆角砾岩岩性的复杂多变,矿化蚀变种类、组合和强弱变化具有规律性。铀矿体(化)主要赋存于隐爆角砾岩和震碎角砾岩中,矿化显现出中富边贫、上强下弱的特征。 相似文献
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晋东北支家地银矿床成矿特征及成因分析 总被引:4,自引:0,他引:4
杨建功 《有色金属矿产与勘查》1999,8(6):551-555
支家地矿床是以银为主,伴生铅、锌的大型独立银矿床。矿体呈脉状、透镜状产于燕山期石石英矿斑岩体边部的隐爆角砾岩中,受隐爆角夺及其下部的断裂构造控制。根据矿石的同位素特征和包裹体特征可知,成矿热液主要岩浆热液, 相似文献
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《西北地质》2016,(3)
在对支家地铅锌银矿区进行了野外调查的基础上,对支家地铅锌银矿开展了矿床地质特征、地球化学特征研究,探讨了该矿的成矿物质来源和成因,为进一步认识浅成热液多金属矿床的成矿规律及建立矿床成矿模型提供了有益的实例。通过对支家地铅锌银矿床的研究表明,支家地铅锌银矿为与隐爆作用有关的多金属矿床,工业矿体的产出严格受隐爆角砾岩体控制,矿体多产出于隐爆角砾岩、次火山岩体与白云岩接触部位、断裂构造及次级断裂构造接触部位。该规律对矿床的远景预测及找矿具有一定的指导意义。根据银矿床成矿地质背景、矿石微量元素稀土元素和同位素等方面的分析,表明该区岩浆岩的主要源区为下地壳,且混有幔源物质,为成矿模型的建立提供了依据。并对铅锌银矿床的地球化学特征及成矿物质来源进行了探讨。 相似文献
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通过对支家地铅锌银矿床的研究,支家地铅锌银矿为与隐爆作用有关的多金属矿床,工业矿体的产出严格受隐爆角砾岩体控制,矿体多产出于隐爆角砾岩、次火山岩体与白云岩接触部位、断裂构造及次级断裂构造接触部位,矿体厚度、矿石质量也受其控制。该规律对矿床的远景预测及找矿具有一定的指导意义。 相似文献
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隐爆角砾岩筒型矿床成矿流体演化趋势曲线特征 总被引:6,自引:0,他引:6
阐述了隐爆角砾岩筒型矿床及其成矿过程中的隐爆流体演化趋势曲线的一般特征,在此基础上,讨论了凹山铁矿床、祁雨沟金矿床、七宝山铜金矿床等典型矿床的矿体产出特征与隐爆流体演化趋势曲线之间存在的耦合关系,结合隐爆角砾岩筒型矿床成矿流体演化的一般特征和特殊情况,对轻微剥蚀岩筒、中等剥蚀岩筒和深度剥蚀岩筒的成矿性进行了分析。 相似文献
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阜平县口子头银钼多金属矿位于县城北部与山西省交界地段,与隐爆角砾岩的产出关系密切。本文通过对该矿区区域地质背景、矿区地质特征、矿体的分布位置分析研究,并结合物化探特征及矿化蚀变情况,对隐爆角砾岩的形成和成矿过程进行了推断,认为该矿床成因类型为与斑岩侵入体及隐爆角砾岩体有关的角砾岩筒型银钼多金属矿床。明确了构造、蚀变和物化探找矿标志,认为沿第6勘探线剖面所见银矿体的走向、倾向的延伸部位是扩大矿床规模的直接找矿方向。 相似文献
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甘肃北山地区南金山金矿床隐爆角砾岩体的发现及成矿规律研究 总被引:6,自引:1,他引:5
地质研究发现,南金山金矿区出露的下石炭统白山组上岩组的部分岩石为隐爆角砾岩,其中厚层-块状变花岗质砂砾岩为隐爆岩浆角砾岩,厚层-块状变凝灰质砂砾岩为隐爆凝灰角砾岩。隐爆角砾岩体呈近EW向带状分布,隐爆岩浆角砾岩分布于岩体中部,构成岩体的内带,隐爆凝灰角砾岩对称分布于岩体南北两侧,构成岩体的外带。经矿床地质研究,提出了新的认识,认为该矿床的形成受隐爆角砾岩体及隐爆断裂构造的控制,金矿体分布于隐爆角砾岩体外带的隐爆凝灰角砾岩及隐爆断裂中;提出了隐爆角砾岩体外带成矿、对称成矿和双层成矿等3条矿体分布规律。采用EH-4连续电导率成像仪进行了深部地球物理测量,测量结果验证了隐爆角砾岩体控矿及其成矿规律。 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
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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