共查询到20条相似文献,搜索用时 859 毫秒
1.
2.
3.
本文以外贝加尔热液体系铀成矿为例,从F、U、Cs等元素地球研究入手,以新的观点剖析了构造 活化区内生铀矿床的铀积聚环境和火山热液体系内的铀成矿机理,从而指明构造岩浆活化区铀找矿的新途径。 相似文献
4.
《铀矿地质》2015,(6)
伊盟和楚-萨雷苏两成矿区,是我国和哈萨克斯坦铀资源规模最大的成矿区,其铀成矿大地构造模式的最大共同点是都处在活化区,同属活化阶段大型自流水盆地,铀具多次成矿叠加作用;最大差别是富铀层位大地构造属性不同,铀成矿期构造活化强度有别。伊盟成矿区富铀层形成于活化阶段早期,岩性岩相变化较大,对形成大型层间氧化带有不利一面,但活化阶段多次强烈隆起,不整合面发育,在不整合面上的砂岩层内,存在有利形成大型层间氧化带的另一面。工业铀成矿作用产生于活化阶段中晚期,形成似层状、透镜状矿体为主的矿床。楚-萨雷苏成矿区富铀层位形成于地台阶段,有多个厚大富铀砂岩层,岩性岩相及厚度稳定;在活化阶段微弱构造作用形成的次造山带内,形成大型卷状体铀矿床。 相似文献
5.
6.
"交点"型铀矿指产于基性岩脉与硅化断裂带交汇部位的铀矿,具有埋藏浅、品位富、铀浸出率高等优点。文章紧密围绕"交点"型铀成矿过程中所经历的"源-运-储"过程,立足于荷泗地区与铀矿密切相关的基性岩脉自身铀含量低,与其有成因联系的流体无法提供有效铀源的客观事实,证实"交点"型铀矿床中的铀确为花岗岩体中的铀活化、迁移、富集而来。笔者借鉴前人运用航空伽玛能谱测量成果重建铀活化迁移路径的成功经验,利用地面伽玛能谱测量成果构建古铀含量(GU)、铀迁移量(Um)两项特征参数表征"交点"型铀成矿中的"源-运-储"过程,并初步查明区内铀源区、铀富集区的分布情况及活化铀的可能迁移路径。然后,通过对铀富集区的工程揭露发现基性岩脉在"交点"型铀成矿过程中主要起还原障及成矿空间的作用;而后期含硅热液(富氧?)则为铀活化的主要驱动力。二者与裂隙中地下水共同作用,形成含铀热液的对流循环体系,不断促使花岗岩中铀的向辉绿岩迁移富集成矿,并以实测数据为例从"源-运-储"三方面构建"交点"型铀成矿模式。 相似文献
7.
中国铀资源区域成矿特征 总被引:36,自引:4,他引:36
本文主要是论述中国铀资源区域分布规律性。根据中国区域构造形成、发展特点, 结合中国铀矿形成、发展特征, 总结了中国铀矿时空分布规律; 对比分析了世界产铀区铀矿的成矿环境,指出了中国铀成矿的区域属性; 重点论述了中国铀成矿域、铀成矿省的成矿特征。 相似文献
8.
9.
本文从区域地质背景、铀矿床类型以及铀成矿条件等论述了康滇地轴南段不同类型的铀矿化在时间、空间上的分布规则。康滇地轴上的铀矿化主要出现在砂岩建造、碳硅泥岩建造、花岗岩体和火山岩及其内外接触带中,而且与每次大的构造活动旋回有关。铀成矿主要发生在前晋宁期、晋宁期、澄江期、燕山期、喜马拉雅期。构造活动后出现的高能氧化环境所产生的红层,往往成为富铀地质体和铀源体,铀经活化迁移而富集成矿。构造活动形成的地层不连续面是铀成矿的重要位置。丰富的铀源、良好的热源和有利的构造是区内铀成矿的条件,三者一致配合才有成铀矿的可能。 相似文献
10.
华南中生代花岗岩型、火山岩型、外接触带型铀矿找矿思路(I) 总被引:15,自引:7,他引:8
华南中生代铀成矿作有处于中国东部燕山期强烈火山岩浆作用、壳幔作用及流体作用时期,铀具有大规模聚集成矿的前景。因此,中生代花岗岩型、火山岩型、外接触带型铀矿找矿必须引进深源成矿理论,淡化“浅成低温活化成矿理论”,充分认识铀矿既可形成于浅源浅成条件,也能形成于深源深成高温条件及深源浅成中温条件的特点,重视早阶段(130-95Ma)铀矿化,打破以主岩类型找矿的人为界限,加强白垩纪岩浆岩体系的研究。 相似文献
11.
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
12.
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
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach 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
14.
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
15.
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
16.
17.
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
18.
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
19.
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
20.
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