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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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铜石金矿化集中区金矿形成与铜石次火山杂岩体有关,受铜石破火山口构造控制,五种矿化类型产于不同的构造部位,受不同的断裂系统控制。其中似层状浸染状灰岩中金矿化受杂岩体外侧的北西向断裂控制;隐爆角砾岩带型金矿受杂岩体边部放射状断裂控制,隐爆角砾岩筒型金矿受杂岩体边部放射状断裂与东西向断裂交汇联合控制;古溶洞型金矿受与断裂有关的古溶洞构造控制;斑岩中的金矿化则与杂岩体中心部位的放射状断裂活动有关。提出了次火山杂岩体边部受断裂控制的隐爆角砾岩筒以及外缘张性断裂发育区是今后在该区重要的找矿方向。 相似文献
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东宁特大型金矿产于岩浆岩中,主要的矿化类型有隐爆角砾岩型、构造蚀变岩型;控容矿构造有隐爆角砾岩筒、断裂和环状、放射状断裂。矿区及外围断裂构造主要有产NE、近SN、NW和近EW向;各方向断裂构造性质复杂,矿区内断裂构造特征及性质的形成与西部近北东向绥阳深大断裂密切相关,而绥阳深大断裂力学性质演化与大地构造环境中区域应力场的变化有关,构造体系成生发展顺序为①东西向构造带;②北东向构造带;③北西向构造带;④北东向构造带;⑤北东向构造带。σ1方向变化为0°→45°→130°-140°→0°→130°。各方向断开控制相应的岩浆岩侵入,而角砾岩筒主要受东西向断裂与北西向断裂交汇部位控制,Ⅱ号脉群及18号脉受同一环型构造系统控制。 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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内蒙古陈家杖子隐爆角砾岩筒及金矿床地质特征 总被引：1，自引：0，他引：1
内蒙古陈家杖子隐爆角砾岩筒金矿床，形成时代为早白垩世。矿床 位于东西向隆化－黑里河－叶柏寿与北东向红山－八里罕大断裂之交汇 处。矿床成因属隐爆角砾岩型金矿。 相似文献
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金厂沟金矿为一典型的隐爆角砾岩筒型金矿,产于华北地台北缘柳河地堑中,矿床在空间上和成因上与隐爆角砾岩关系密切,矿体受环状断裂和放射状断裂控制,以蚀变岩型矿化为主。包裹体以气液相包裹体为主,成矿温度为２０６～３９８℃,盐度为５．７～１１．５ｗｔ％ＮａＣｌ。该矿床为次火山作用期后热液交代形成的蚀变岩型金矿。 相似文献
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根据吕梁山中段近EW向区域深大断裂控岩控矿的特点,通过对灵钟山一带金矿床的成矿环境、地球物理、地球化学特征的综合研究,预测了该区深部存在隐伏岩体的可能及其对深部成矿的重大义意。通过对该区金矿化体的分布规律、产出状态、矿物组合、围岩蚀变等特征的总结归纳,认为该区主要具有受构造破碎带控制的蚀变岩型金矿和隐爆角砾岩型金矿两大类型,有三个成矿期,在成矿空间上、时间上受燕山期中酸性岩体和隐爆岩制约, EW向构造破碎带及红化、硅化等围岩蚀变是主要的找矿标志。 相似文献
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宁德九曲岭含铜钨矿隐爆角砾岩筒出露于花岗闪长岩体之中,未见明显断裂控制。隐爆角砾成分与胶结物成分复杂,矿化蚀变具明显的分带特征,其中铜钨矿贮存于黄铁矿一绿泥石和石英一绿泥石带中。外围尚发现2个大型隐爆角砾岩筒,通过研究九曲岭铜钨矿角砾岩筒特征,对指导深部与外围找矿具有重要找矿意义。 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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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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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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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h 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