共查询到20条相似文献，搜索用时 62 毫秒
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新晃贡溪重晶石矿是我国目前发现的规模最大的一个沉积型重晶石矿。矿区位于湘黔两省接壤处。大地构造位置属扬子地台江南古陆的雪峰古陆湘黔桂隆起带。含矿岩系为震旦系上统陡山沱组白云岩、留茶坡组硅质岩及寒武系下统牛蹄塘组下段碳质页岩。其中后者是主要含矿层,由碳质页岩、重晶石、钙质磷块岩、硅质岩组成,厚10.8— 相似文献
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《吉林大学学报(地球科学版)》2015,(Z1)
<正>0前言夏家店金矿床位于陕西省山阳县东南部,矿体产于南秦岭陡岭古隆起边缘寒武系—震旦系碳-泥-硅质板岩及白云岩中[1],属于卡林型金矿床。1含矿岩系特征夏家店金矿床产于山阳—柞水—修石崖断裂下盘—镇安断裂次级断裂系统中。整体构造线方向为近东西向,矿区内未见岩浆岩出露。震旦系地层有陡山沱组(Z2d)和灯影组(Z2dn),陡山沱组分布于矿区北 相似文献
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<正> 宁镇山脉震旦系是下扬子东部发育较完整的地区,出露于镇江孟河、埤城、仑山和南京幕府山等地(图1),东西长百余公里,组成复式背斜核部。由海相、冰海相碎屑岩、碳酸盐岩组成,总厚大于1500m。与下伏下元古界变质岩为不整合,与上覆含Redlichia的寒武系为假整合接触。自下而上分为下统尧巷组(新建)、高桥组,上统陡山沱组、灯影组。 相似文献
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扬子地台震旦系—寒武系界线剖面地层对比的新认识 总被引：6，自引：0，他引：6
前言 1984—1985年,笔者等在加深云南晋宁梅树村(以下简称梅树村)前寒武系—寒武系界线层型候选剖面研究程度的过程中,于云南江川侯家山剖面渔户村组旧城段采集了丰富的宏观藻类化石。1985年4月,考察了扬子地台有关的震旦系—寒武系界线地层剖面,包括贵州织金五指山、戈仲伍,清镇阿坝寨,湖北宜昌天柱山、黄家塘、泰山庙,房县西蒿坪矿硐坡,陕西宁强宽川铺石中沟及四川峨嵋麦地坪等9条界线剖面。在房县西蒿坪剖面发现新的化石层位,于西蒿坪段首次发现有绞纲腕足类。在宁强宽川铺石中沟剖面灯影组宽川铺段中部发 相似文献
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白果园黑色岩系型银（钒）矿床沉积古环境与银（钒）初始富集 总被引：9，自引：0，他引：9
白果园银（钒）矿产于震旦系陡山沱组黑色色岩系中。矿床的地球化学和有机地球化学研究表明，黑色页岩含丰富以低等海生生物为主的腐泥型有机质，黑色页岩形成于局限的滞留海盆。 相似文献
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湖北秭归庙河地区震旦系陡山沱组微化石的新发现 总被引：4，自引：0，他引：4
庙河地区震旦系陡山沱组燧石中的激化石，前人曾有过报道。但是，所报道的激化石组合与已知峡区的其他震旦系剖面陡山沱期微化石明显不同。具刺疑源类以ＭｉｃｒｈｙｓｔｒｉｄｉｕｍｔｌａｎｃｅｄｅｔｕｍＬ．Ｙｉｎ为主（样品号：Ｈｍ８０—１４—２，Ｙｉｎｂｏｒｎｉｎｇ，１９８５）。１９９２年作者等重新研究了庙河震旦系沿江剖面，系统采集了燧石样品。结果，并未在陡山沱组发现上述微化石组合，而在寒武系底界附近的燧石夹层中，发现了与其相同的微化石群，因而，对上述微化石组合出现的层位提出质疑。最近，作者再次对庙河地区陡山沱组燧石 相似文献
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我国中上扬子地区下古生界黑色页岩是震旦系、二叠系大中型气田的重要烃源岩,同时其自身也具有形成页岩气藏的巨大潜力。初步研究表明,中上扬子地区下古生界有利页岩气层主要发育在下震旦统陡山沱组、下寒武统筇竹寺组、上奥陶统五峰组和下志留统龙马溪组,这些层位的黑色页岩厚度、有机碳含量、以及Ro值等各项参数均符合形成页岩气藏的特征,是今后页岩气勘探的潜力地层。 相似文献
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<正> 开阳磷矿围绕着洋水复式背斜产出。洋水背斜属于新华夏系第Ⅲ隆起带南西端的第二级构造单元。马路坪矿段位于洋水背斜的东翼中部。出露地层自下而上有前震旦系板溪群清水江组;震旦系南沱组、陡山沱组和灯影组;寒武系下统牛蹄塘组、明心寺组和金顶山组。下磷矿层产于陡山沱组上部,上磷矿层产于牛蹄塘组底部。 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