共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
3.
何双梅 《矿物岩石地球化学通报》1989,(4)
铁帽型金矿床是由含金硫化物矿床经风化淋滤而成的。埋藏浅,易于露采,一般说金、银品位较原生矿床高,具重要的工业价值。 1.矿床地质特征铁帽型金矿床实际上是含金硫化物矿床的风化带,矿床产于层间的构造破碎带中。如新桥铁帽型金矿床是沿泥盆系和石炭系之间的层间断裂发育。代家冲金矿产 相似文献
4.
南非主要金矿集区研究现状及存在问题 总被引：1，自引：0，他引：1
南非是世界上金矿石资源量最为丰富的国家,其金矿床主要产于东北部地区,主要有三种类型:1赋存于兰德盆地砾岩型建造中的"兰德"砾岩型金矿床,2产在绿岩带中的绿岩带型金矿床,和3主要与白云岩有关的白云岩型金矿床,以前两种类型为主。"兰德"砾岩型金矿床通常品位高,开采规模最大,目前采矿的深度最大,是南非最重要的矿床类型,其矿床成因长期以来存有争议,主要有两种观点,分别是砂矿模式和热液模式,就目前资料来看笔者等认为其代表了两个不同的矿化阶段;绿岩带型金矿床则以巴伯顿地区为代表,矿床具有规模大、易开采等特征,因此在南非金矿床开采中占有重要位置,其矿床主要赋存于石英脉或剪切带中,矿床成因主要有三种,分别是火山成矿模式、转换滑脱构造模式和构造交叉模式。 相似文献
5.
6.
中温热液金矿床赋存在由花岗岩侵位的碰撞造山带的各个时代的以火山岩为主和沉积岩为主的上壳岩带内。贫的和富的成矿带的主要区别是,富矿带容纳有异常大的矿床。这一模式是对区域内所属不同成矿带的矿区间进行成矿贫富性的详细对比而得出的。我们对该区域４７ 个巨型（＞ ６０ｔＡｕ）中温热液金矿床的地质特征和背景的研究表明,８０％ 的金矿床产在以火山岩为主的上壳岩带,而２０％ 的金矿床产在沉积岩为主的上壳岩带。几乎没有证据能够说明巨型矿床的产生是受矿物沉积规模所控制。例如：围岩岩性的复杂性控制着矿床构造的复杂性,而与矿床规模无关。从区域上讲,不管怎样,巨型金矿床特定的有利的岩石组合并可能与早期形成的金矿化体有显著关系。多数以火山岩为主的上壳岩带内的巨型金矿床出现在具有高镁火山岩（科马提岩）或侵入的岩带内,其中２０％ 与长英质火山岩共生;７５％ 含有前变质高铝热液蚀变矿物组合。一个巨型矿床和许多小型矿床与斑岩型Ｃｕ－Ａｕ 矿化关系密切。赋存在前寒武纪以沉积岩为主的上壳岩带内的巨型金矿床均以含铁建造为主,但在显生宙以沉积岩为主的上壳岩带内的矿床却不是这样。解释中温热液金矿床的共有特征,金矿床矿物学特有的事实说明与围岩环境有关。矿床的同位 相似文献
7.
8.
凉亭银金矿床是正在普查的中型银金矿床,通过对矿床地球化学异常特征分析,建立地球化学找矿指标,为扩大矿床成矿远景和矿带普查起到了重要指导作用。 相似文献
9.
湖南白马山-龙山东西向构造带金锑矿找矿前景分析 总被引：13，自引：0，他引：13
将白马山－龙山东西向构造带金（锑）矿床划分为微细粒浸染型金属床、破碎带蚀变岩型金锑矿床、石英脉型金矿床等三种类型，描述了矿床的主要地质特征，总结了微细粒浸染型（高家坳式）金矿床、破碎带蚀变岩型（龙山式）金锑矿床和石英脉型（古台山式）金矿床的找矿标志。认为该构造带金锑矿找矿应依托穹窿构造来开展，并提出进一步找矿的方向。 相似文献
10.
赵沟金矿床位于礼—岷金矿带东部 ,是李坝大型金矿床外围的中型金矿床。随着找矿工作的深入 ,发现本矿床地质特征及控矿因素与李坝大型金矿床有相同性 ,矿 (化 )体受构造及岩脉的控制。据控矿因素分析 ,已知矿体深部及西部找矿潜力很大 ,应进一步开展找矿工作。本矿床有望成为礼—岷金矿带继李坝、金山大型金矿床之后的又一大型金矿床 相似文献
11.
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
12.
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
13.
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
14.
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
15.
16.
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
17.
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
18.
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
19.
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
20.
正20141768 An Shaopeng(Institute of Rock and Soil Mechannics,Chinese Academy of Sciences,Wuhan 430071,China);Wei Lide Experimental Study on Mechanical Behavior of Xigeda Formation Siltstone and Structure Interface(Journal of Engineering Geology,ISSN1004-9665,CN11-3249/P,21(5),2013,p.702-708,9illus.,1 table,16 refs.) 相似文献