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1.
拿若铜(金)矿床是多龙矿集区内继多不杂斑岩铜(金)矿、波龙斑岩铜(金)矿之后又一取得重大找矿突破的大型斑岩型矿床。作者以矿区探矿工程分析数据为基础,研究各成矿元素空间分布规律。成矿元素在垂向上的分带特征不明显,在平面上分带特征较显著,表现为自矿区中心ZK0001,向南西方向具有Cu+Au-Cu(Au、Ag)→Cu(Ag、Au)-Cu(Ag)的分带特征。同时,矿区土壤地球化学测量显示,从0线开始至31线(北东→南西)具有Mo、Cu→Mo(Cu、Au)→Cu、Au(Ag、Mo、Pb)→Pb→Pb、Zn分带特征,显示物质来源和热源位于0线附近,成矿流体是以0线、7线一带向四周运移,并具有从北东向南西方向运移的特点。通过矿床地质特征、元素分带特征研究,建立了矿区地球化学勘查模型。 相似文献
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广西金山金银矿区成矿构造分析和构造地球化学找矿 总被引：2，自引：1，他引：1
通过广西金山金银矿区现场地质调查和构造编图,系统总结了矿区构造控矿规律。在此基础上针对主控矿断裂开展地球化学找矿研究。矿区兼有产于主控矿断裂带中的蚀变岩型金矿和侧羽状张裂带中的石英脉型金矿两种类型,不同的构造环境控制不同的矿化类型,可互为找矿标志;矿体受构造界面控制,控矿断裂成矿期不均一张开导致矿化分段富集;成矿期的构造活动表现为主断裂上盘向南西斜滑,相应地矿体向南西侧伏、倾斜延深明显大于延长;矿体中部厚、两侧薄,11号勘探线为矿化富集中心。随热液蚀变的增强,Ag、Au、Cu、Pb和Zn含量逐渐增高。因子分析表明,矿区主成矿元素组合为Ag、Au、Cu、Pb和Zn,可作为找矿的指示元素。元素分布型式、元素组合分析和分形分维统计显示,本区Ag、Au成矿具多阶段性。矿区构造地球化学原生晕分带序列自上而下为Au-Hg-As-Bi-Sn-Sb→W-Co-Cr-Ti-Ni-Ag-V-Mn→Cu-Zn-Pb-Mo,显示该矿床为一浅剥蚀矿床。在综合分析成矿构造、岩浆活动、蚀变特征和构造地球化学原生晕分带资料的基础上,认为矿区深部和外围仍有较好的找矿前景。其中矿区深部找矿重点在11线南西侧。 相似文献
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西藏甲玛铜多金属矿元素分布规律及地质意义 总被引：18，自引：7，他引：11
甲玛铜多金属矿床已经成为冈底斯成矿带内为数不多的铜品位高、规模大、矿体连续性好的超大型斑岩-矽卡岩-角岩型铜多金属矿床。文章根据167个钻孔的成矿元素化学分析结果,对各元素平面分带、（Pb+Zn）/Cu、Au/Cu、Mo/Cu、Pb/Ag、Zn/Pb、Zn/Cu比值分带以及剖面上元素的分带等进行了系统分析,认为甲玛铜多金属矿具有典型的与岩浆成矿作用有关的元素分带特征,矿体由深部向浅部具有Mo→Mo（Cu）→Cu+Mo→Cu（Pb+Zn+Mo）→Cu（Pb+Zn）→Pb+Zn的成矿元素分带现象,具有高温→中低温成矿演化的特点。研究提出,成矿流体的运移方向是由北东至南西,流体源位于矿区北东部的则古朗地区。这种典型的热液分带特征同海底喷流沉积矿床近管道相Pb/Ag比值高、远离喷口Zn/Pb、Zn/Cu比值高的元素分带特征有着本质的区别。矿区北部则古朗地区高Mo/Cu比值以及钼元素矿化强度随标高降低愈强的分布特点,均预示了该地区是深部隐伏含矿斑岩体之所在。 相似文献
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广东紫金风门坳矿区富集Sn、W、Pb、Zn、Cu、Mo、Au、Ag、As等元素,但分布不均匀,具有叠加富集特征。通过在风门坳矿区开展1∶10 000土壤地球化学测量工作,圈定了2处矿致综合异常,结合各矿床（点）成矿特征,认为风门坳矿区成矿元素自北西向南东依次为Sn、W、Pb、Zn、Cu、Mo→Sn、Cu、Au→Pb、Ag、Zn,呈规律性水平分带。结合矿区3号勘探线矿化（体）特征,认为矿床成矿元素在垂直方向自上而下分带为Sn、W、Pb、Zn→Cu、Zn、Ag→Sn、Zn。上述规律可为今后在该区继续开展扩大扩深找矿工作提供有利线索。 相似文献
6.
广东紫金风门坳矿区富集Sn、W、Pb、Zn、Cu、Mo、Au、Ag、As等元素,但分布不均匀,具有叠加富集特征。通过在风门坳矿区开展1∶10 000土壤地球化学测量工作,圈定了2处矿致综合异常,结合各矿床（点）成矿特征,认为风门坳矿区成矿元素自北西向南东依次为Sn、W、Pb、Zn、Cu、Mo→Sn、Cu、Au→Pb、Ag、Zn,呈规律性水平分带。结合矿区3号勘探线矿化（体）特征,认为矿床成矿元素在垂直方向自上而下分带为Sn、W、Pb、Zn→Cu、Zn、Ag→Sn、Zn。上述规律可为今后在该区继续开展扩大扩深找矿工作提供有利线索。 相似文献
7.
鸡笼山夕卡岩金(铜)矿床分带及流体演化 总被引：1，自引：0，他引：1
鸡笼山金铜矿床产于燕山期钙碱性花岗闪长斑岩与下三叠统大冶组灰岩接触带。夕卡岩分带从内向外依次为花岗闪长斑岩→蚀变花岗闪长斑岩→透辉石-石榴石夕卡岩→石榴石夕卡岩→硅灰石或石榴石-硅灰石夕卡岩一大理岩。矿化分带序列为Cu(M。)→Cu(Au)→Au(Cu)→Au-Pb-Zn。与早期夕卡岩阶段有关的流体包麦体表现为高温高盐度。温度范围400~680℃ ,平均456℃ 。大约有18%所测石榴石中的流体包裹体含石盐子晶,盐度为20.6%~51%NaCl,平均43.2%NaCl。石英、方解石中的包裹体代表成矿期的流体,温度范围126~386℃ ,平均286℃,盐度为8.7%~21.2%,平均15%。成矿深度为2 km,静水压力20 MPa。 相似文献
8.
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
9.
云南富乐厂铅锌矿床是滇东北矿集区东南部的典型矿床之一。在矿区进行大比例尺构造填图的基础上,运用构造成矿动力学的理论和方法,筛选典型断裂构造进行力学性质的鉴定,对不同期次、不同方向的断裂特征进行了系统阐述,初步划分了构造期次,总结了构造体系。认为该区断裂经历了晋宁期-澄江期近东西向的挤压作用,印支期-燕山早期北西-南东向挤压作用及后期燕山中晚期-喜马拉雅期的北东-南西向挤压作用的过程。晋宁-澄江期构造作用为该区成矿提供了有利的地质背景,印支期-燕山早期为该矿成矿主期,北东向压扭性断裂和北西向的扭张性断裂使得流体充填、富集成矿;后期近东西向的扭性断裂为破矿构造。通过矿区构造与成矿关系的研究,为隐伏矿预测与深部勘查提供了依据。 相似文献
10.
达达肯乌拉山铅锌矿床位于柴北缘成矿带南部,是近年来在泥盆系牦牛山组陆相火山岩中新发现的矿床。笔者对矿区00勘探线上3个钻孔岩心样数据,运用格里戈良原生晕分带指数法和构造叠加晕找盲矿法研究了原生晕特征。研究表明,Mo、Cu是铅锌矿体前晕,Sb是近矿晕,Au、As、Ag是矿尾晕;垂向分带序列由下向上为Ag→As→Au→Pb→Zn→Sb→Cu→Mo,序列具反向分带特征,铅锌成矿成晕是多次叠加的结果;矿(化)体轴向深部有前、尾晕叠加共存的重要信息,推测存在隐伏矿体。综上建立了该矿床深部找矿预测的成矿成晕模型。 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.
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
13.
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
14.
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