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对西藏昆仑山南坡1∶20万化探工作中圈出的土则雪山HS16综合异常查证中,发现宽850 m,长约4 km,由8个铜、铜锌、铜铅锌和2个铜矿化体组成的大型铜多金属矿带,其矿床成因类型为兼具沉积砂岩型铜矿和中低温热液型多金属矿床的沉积改造型矿床.该调查区铜的找矿潜力极大,具备有发现矿田级铜矿产的前提.作为铜矿的伴生,共生银、铅、锌矿也具有相当的找矿潜力. 相似文献
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新疆库车盆地分布着一系列砂岩型铜矿床和矿点,文章在野外调查的基础上开展康村地区铜矿沉积环境和成矿模式研究,总结了区内沉积环境、沉积相与铜矿化体的配置关系,进而探讨了矿化成因和成矿模式。结果表明：康村地区新近系中可以识别出主要的沉积相类型有冲积扇相、扇三角洲相和湖泊相,以及5种亚相和7种微相。砂岩型铜矿化与沉积环境相关,矿(化)体主要分布在扇三角洲平原相和扇三角洲前缘相。2件样品LA-ICP-MS测年数据分别为427.4±6.6 Ma、387.3±3.3 Ma和424.6±2.3 Ma、279.9±6.8 Ma,表明康村地区中新统吉迪克组(N1j)含铜砂砾岩的物源主要来自于库车盆地北西南天山造山带古生代晚志留世至早二叠世地质演化所形成的地层和岩浆岩产物。康村地区的矿化类型为砂岩型铜矿化,深部铜富集为硫酸盐热化学还原作用(TSR)型矿化成因,近地表矿化为后期盆地地上和地下卤水改造成因。库车盆地康村地区的铜矿化形成于新近系砂岩成岩之后,为后生富集,主要受新近纪后期断裂构造及后生卤水控制。 相似文献
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《矿产与地质》2019,(6)
景谷曾家村铜矿床位于三江构造带中段的兰坪—普洱中—新生代盆地中南部。在野外勘探工作基础上,结合室内岩矿鉴定结果,对曾家村铜矿成矿地质特征进行了详细研究,并开展了与同构造位置的宋家坡铜矿矿石成分对比研究。研究结果显示:曾家村铜矿在矿体形态、矿石组构以及围岩蚀变方面既有典型层控沉积矿床特点,又有后期叠加改造特征,双重成矿作用特征明显。矿石成分对比分析结果显示:区域内三叠系火山岩对曾家村铜矿成矿金属有一定贡献,二者物源属性既有亲缘性又有继承性。综合矿床地质特征、矿石成分对比研究结果和区域构造演化史,认为曾家村铜矿床属典型的沉积-改造型铜矿床。曾家村铜矿床勘探成果、经验及成因认识的厘定,为整个兰坪-思茅盆地类似地区铜矿找矿打开了思路,拓宽了区域找矿前景。 相似文献
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罗恩铜矿床产于中南部非洲赞比亚-刚果(金)铜钴成矿带南东端卢安夏盆地的东端,为该成矿带内一个典型的铜矿床,其矿床分布和产状严格受区域构造、地层、岩相古地理条件控制。本文旨在通过对该矿床勘查、开采历史地质资料整理,研究其成矿规律、总结找矿标志,指导卢安夏盆地深边部找矿。经对罗恩铜矿床矿体就位空间、容矿岩石、控矿构造、矿化富集规律、矿化分带等特征的研究总结,建立了罗恩-穆利亚希盆地地质矿体模型,指出矿床位于盆地东南部紧窄部位,矿体定位于沉积建造盆内的下罗恩亚群RL6地层泥质板岩和白云质片岩中,明显受后期构造变形作用影响,含矿地层与褶皱同步褶曲、折叠形成厚大矿体,"盆"、"层"、"相"、"位"、"带"为该矿床的找矿标志。 相似文献
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通过对查干德日斯铜(金)矿区地质地球化学勘查工作,区内发现铜矿体1条、铜(金)矿化体1条、铜矿化蚀变带8条。铜(金)矿化体均赋存于NEE向、NNW向断裂破碎带内,且以NEE向为主;矿化与褐铁矿化石英脉密切共生,伴随明显的硅化、钾化热液蚀变。认为矿区Cu-Au-Ag原生晕组合异常明显,与断裂构造套合良好;铜(金)矿化受构造控矿特征明显,热液充填-交代作用强烈,初判为热液充填交代型矿床。矿区深部矿成矿地质条件优越,找矿前景良好。 相似文献
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赞比亚-刚果铜矿带(中非铜矿带)是世界著名的沉积型铜矿集中区,带内分布着诸多世界级大型铜矿床。该铜矿带由赞比亚铜矿带和刚果铜矿带两部分组成,其中赞比亚铜矿带长约150km,宽约50km,主要分布于赞比亚铜带省和西北省,位于区域性的Lufilian(卢弗里安)褶皱弧东南端。加丹加超群构成了赞比亚铜矿带主要的沉积盆地,该盆地中的罗安组,特别是下罗安组地层是区内大多数铜矿床的主要含矿层位。沉积盆地中特定的氧化-还原分带和岩相分带决定了从盆地边缘到中心,矿物相由铁氧化物带到铜硫化物带再到黄铁矿带的变化规律,由此总结出铜矿床多产于距沉积盆地边缘10km左右的范围内。因此,越靠近盆地中心,所接受的成矿物质(物源)越少,且成矿环境越趋向于还原环境,多形成黄铁矿,不利于铜矿化。将以上控矿要素归纳为"盆"、"层"、"相"、"位",分别表示沉积盆地、矿化层位、沉积相及空间位置,并对其分别进行简要阐述,旨在为赞比亚铜矿带的成矿规律研究和找矿工作起到抛砖引玉的作用。 相似文献
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通过系统的野外地质调查,在详细了解黑恰铁多金属矿化带地质特征的基础上,探讨铁矿成因类型,分析铁矿成矿期后的改造与铜、铅、锌的再造,结合找矿标志,预测矿化体的空间就位,提出找矿方向,以指导该带矿产评价工作。研究认为,黑恰铁多金属矿化带含矿建造沉积环境为滨海-浅海陆棚相,铁矿床成因类型为海底沉积喷流-改造型,铜、铅、锌矿属热液再造型,与铁矿(化)体的空间关系密切,推断其矿源层为菱铁矿建造。铁矿形成后经历区域变质变形改造期、构造叠加改造期和表生氧化期。铁矿在遭受强烈改造的同期,铜、铅、锌通过热液活化再造富集成矿。铁矿的主要控矿构造样式为残破的紧闭-等斜向斜和假单斜。铜、铅、锌层控特征明显,空间上与主要铁矿同体共生或赋存于铁矿体上盘围岩构造裂隙中。黑恰铁多金属矿化带已新发现多处成矿线索,通过进一步的矿产地质工作,有望实现铁多金属找矿新突破。 相似文献
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一种非传统铜矿资源——黔西北地区峨眉山玄武岩铜矿地质特征及成因探讨 总被引：4，自引：0，他引：4
总结了在黔西北地区铜矿资源调查中首次发现的峨眉山玄武岩铜矿的地质特征,并对其矿床成因、找矿标志、找矿方向、找矿远景、工作方法进行了探讨.研究表明该区存在沉积型和热液型两种矿化成因类型,并分布在玄武岩的4个不同层位中,成矿物质来源于玄武岩,在玄武岩喷溢的同时,形成火山热液矿化类型,在后期构造作用下,可进一步形成构造热液矿化类型;在火山喷溢间歇期及火山活动期后,由于地表风化剥蚀、水体搬运,在陆地湖盆中形成沉积型铜矿.研究认为沉积型铜矿是该区未来主要的找矿对象.由于铜矿所在区域亦是铂钯金等元素异常区,且沉积型铜矿常常与铁铝质层相伴产出,因此应加强对古陆地沉积相、古地理环境的研究,并注意综合评价. 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