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位于内蒙古中部的李清地铅锌银矿床近期找矿获重要进展,该矿床为与中生代陆相火山作用有关的浅成低温热液型,以大脑包山为中心发育的环状与草药放射状断裂构成的火山机构制约了铅锌银矿化的产出.以往一直认为控矿断裂走向为NE向,虽投入大量勘探工程,仅获得小型独立银矿储量.研究发现,其成矿规律表现为北东向(基底)构造控制矿带,北西向构造控制矿体,主要铅锌银矿体赋存于NW向断裂中,NW向构造与NE向构造的交汇部位附近形成富厚矿体,这一控矿构造的重新认识,直接导致了李清地矿床找矿的新突破,发现富厚铅锌、银、金矿体.目前矿区相继发现多条NW向含矿断裂,显示出整个李清地矿区具有大型以上的铅锌、金、银矿的远景. 相似文献
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吉林集安市兴农铅锌矿成矿地质特征及找矿方向 总被引:2,自引:0,他引:2
集安市兴农铅锌矿位于鸭绿江多金属成矿带南西部,区内构造发育,岩浆岩广布,成矿地质条件十分优越.平行于鸭绿江大断裂的次一级北东向断裂是主要控矿构造,它既是导矿构造,又是容矿构造,区内两条构造带伴随着含矿热液的活动被石英脉充填,并在有利位置富集成矿.目前地表已发现5条铅锌矿体,深部探获4条铅锌盲矿体和1条金盲矿体,矿体呈脉... 相似文献
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黄沙坪铜锡多金属矿床是在钦杭成矿带和南岭成矿带叠合构造背景下形成的岩浆热液型多金属成矿系统的典型代表,该区铜多金属矿与锡多金属矿成矿系统复合、多期构造体系联合、深部钨锡矿与浅部铅锌银矿耦合等特点突出。针对该矿床控矿构造深部展布格局不清、深部铜锡多金属矿体定位不明的核心问题,基于矿田(床)构造精细解析,开展了多期构造体系控岩控矿作用机理及其控矿构造深延格局的深入研究,表明岩浆侵入接触构造系统与倒转背斜翼部的层间断裂-裂隙系统分别控制了脉状-不规则SK型铜钨锡多金属矿体群与沿NNE-NE向层间断裂带、NW向断裂带分布的热液脉型铅锌银(金)矿体群,这些矿体群具有不同的侧伏规律;基于矿田、矿床、矿体(脉)尺度控岩控矿构造组合样式的剖析,揭示了构造分级控岩控矿规律和中心对称成矿效应,厘清了成矿前、成矿期和成矿后构造体系,构建了矿田构造控岩控矿模式,进一步论证了坪宝矿田成矿构造动力学背景:中生代以来,坪宝矿田构造应力作用呈现“顺时针式”的运动方式,在燕山早期太平洋板块与华夏板块发生碰撞造山作用,在区内产生SEE-EW向主压应力作用,从而在矿田内形成了中酸性岩浆侵入成岩成矿系统。这些认识为坪宝矿田乃至钦杭、南岭成矿带湘南地区深部找矿勘查提供了重要启示。 相似文献
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山东招远市前孙家金矿构造控矿规律和构造地球化学找矿 总被引:2,自引:0,他引:2
通过对前孙家金矿矿区构造控矿规律研究可知,本区控矿构造型式为成矿前北东向压扭性断裂构造系统中构造透镜体四周的环边式"X"型断裂,控矿构造具有北北东向、近南北向的优选性,成矿期的构造应力场表现为左旋斜滑运动,主断裂带上的南西向侧伏构造控制了矿体延深。矿区成矿元素组合为Au、Ag、As、Co、Mo、Sn。构造地球化学高值带具有与矿体侧伏方向的一致性。根据控矿构造型式、矿体产出规律、成矿期构造应力场分析和数值模拟以及Au构造地球化学异常和成矿因子得分等值线图等方面成果综合分析,提出矿区下一步找矿有利地段有三处:4号脉的南西深部、2号脉的南西深部和新1号脉西侧。 相似文献
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长安金矿矿体呈似层状、透镜状产于NE陡倾F6断层破碎带的东亚带砂泥质构造岩中,成矿期发生近EW向断裂的构造叠加,成矿之后又遭受到近EW向小断裂的破坏.F6断层破碎带西亚带具导矿作用,东亚带起到容矿的作用,成矿期叠加的EW向断裂(F7、F8、F9等)兼具导矿和容矿作用,侵入于F6断裂带中的细晶正长岩、煌斑岩、辉绿岩等岩浆活动所带来的成矿流体促使矿质富集,形成工业矿体,成矿期后近EW向断裂(F10-1、F10-2)和NNW、NE向小断裂(f)为破矿构造.据此把长安金矿断裂构造演化和成矿初步分为主控矿断裂成矿、叠加断裂成矿和后期断裂破矿三个演化阶段. 相似文献
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通过对赫章县白腊厂观音山铅锌矿床地层、构造及矿体特征的分析,从构造、含矿岩性、物源等方面对该矿床进行了控矿条件进行研究。矿床主要受北西向和北北东向两组构造控制,该构造既为含矿热液的导矿构造,也为该区铅锌矿体的容矿构造。矿体主要产于碳酸盐岩地层中,层控特征明显。成矿物质可能主要来源于地层,但有深部地壳或地幔硫的混合。综合研究表明,该矿床属于层控矿床,北西向和北北东向两组构造以及旁侧小褶皱分布区域可能为成矿远景区。 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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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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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
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《地学前缘(英文版)》2014,(3):I0001-I0003
正1 AIM AND SCOPE GEOSCIENCE FRONTIERS(GSF) is a bi-monthly international journal that publishes in English high quality original research articles and timely reviews in interdisciplinary fields of Earth and Planetary Sciences.GSF aims to bridge innovative,provocative and challenging concepts and models related to various fields of research including petrology and geochemistry in understanding lithospheric architecture 相似文献
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正1 Introduction In the present paper,MgCl2·6H2O,FeCl3·6H2O,and CeCl3·6H2O were used as raw materials in the precipitationhydrothermal method to synthesize MgF eC e hydrotalcite.The effects of the Fe:Ce molar ratio on the composition,crystal structure,and thermal stability of hydrotalcite are examined.Energy-dispersive X-ray spectroscopy(EDS),X- 相似文献
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正20141430 Chen Ji(Key Laboratory of Petroleum Resources,Chinese Academy of Sciences,Lanzhou 730000,China);Shi Ji’an Sedimentary Facies and Models for the Palaeogene-Neogene Deposits on the Northern Margin of the Qaidam Basin,Qinghai Province(Sedimentary Geology and Tethyan Geology,ISSN1009-3850,CN51-1593/P,33(3),2013,p.16-26,14 illus.,16 refs.) 相似文献
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正20141967An Zhanghui(Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,China);Du Xuebin Study onthe Geo-Electric Field Variation of Sichuan Lushan MS7.0and Wenchuan MS8.0Earthquake(Chinese Journal of Geophysics,ISSN0001-5733,CN11-2074/P,56(11), 相似文献
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正20141357 Guo Tao(School of Mathematics and Science,Shijiazhuang University of Economics,Shijiazhuang 050031,China);Hu Jiawen Assessment on the New Pressure-Volume-Temperature(PVT) Data of Supercritical Water(Geological Journal of China Universities,ISSN1006-7493,CN32-1440/P,19(3),2013,p.447-455,9 illus.,3 tables,32 refs.)Key words:supercritical fluids 相似文献
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正20141074Bao Xijie(Research Institute of Exploration and Development,Daqing Oilfield Company,PetroChina,Daqing 163712,China)Gather Optimal Processing and Application Effect of Prestack AVA Instantaneous Inversion 相似文献