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1.
延边东北部地区中生代火山——岩浆岩区金铜矿成矿特征 总被引：7，自引：0，他引：7
延边东北部地区中生代陆相火山断陷盆地处于吉黑褶皱系延边优地槽褶皱带延边复向斜内;区内中生代以来不同方向的断裂发育,火山活动强烈,岩浆侵入频繁;与中生代火山－岩浆活动有成因联系的金、铜金属矿床多处,矿化蚀变线索也较多,构成了著名的五凤－小西南岔近东西向火山－岩浆期后低温热液型金、铜多金属矿带;区内中生代火山－岩浆岩的形成是太平洋板块俯冲作用使大陆边缘拉张活动不断加剧,造成上地幔岩浆上侵的结果;并伴有 相似文献
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延边东北部地区中生代陆相火山断陷盆地处于吉黑褶皱系延边优地槽褶皱带延边复向斜内;区内中生代以来不同方向的断裂发育,火山活动强烈,岩浆侵入频繁;与中生代火山-岩浆活动有成因联系的金、铜金金属矿床多处,矿化蚀变线索也较多,构成了著名的五凤-小西南岔近东西向火山-岩浆期后低温热液型金、铜多金属成矿带;区内中生代火山-岩浆岩的形成是太平洋板块俯冲作用使大陆边缘拉张活动不断加剧,造成上地幔岩浆上侵的结果;并伴有成矿作用的发生,在岩浆岩体内外接触带的有利部位形成金、金铜或铜金多金属矿床;从远源至近源的成矿分带为Au-Ag→Au-Cu-Ag→Cu-Au-Pb-Zn→Cu(-Mo-Au);成矿作用表现出从低温至高温、从低硫到高硫的变化. 相似文献
3.
吉林延边地区中生代火山岩带成矿系列 总被引：2，自引：0，他引：2
延边地区是我国东部滨太平洋的一个重要金、铜—(多金属)矿化集中区。成矿带在时、空和物质组成上主要受控于中生代火山-岩浆侵入作用,形成多种矿床类型组合的成矿带。在分析成矿带内不同矿床成因类型的基础上,建立了该成矿带的成矿系列:火山、次火山热液-斑岩型金铜及钼铅锌银成矿系列。 相似文献
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吉林东部(延边地区)中生代以来不同方向的断裂构造发育,火山活动强烈,岩浆侵入频繁,与中生代火山-岩浆活动有成因联系的金、铜多金属矿床多处,矿化蚀变线索多见,构成了知名度很高的五凤-小西南岔近东西向火山-岩浆期后低温热液型金、铜多金属成矿带.区内中生代火山-岩浆岩的形成是上地幔岩浆上侵的结果,同时伴有成矿作用的发生,在构造有利部位形成金、金铜或铜金多金属矿体.成矿物质来源于地幔,成矿是在酸性介质中还原条件下发生的.从远源至近源,成矿分带为Au、Ag→Au、Cu、Ag→Cu、Au、Pb、Zn→Cu、(Mo、Au),成矿温度从低温至高温变化,硫化物从贫硫化物向富硫化物变化. 相似文献
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吉林延边地区中生代火山岩金铜成矿系列及区域成矿模式 总被引：1，自引：0，他引：1
延边地区为我国东部滨太平洋的一个重要金、铜 - (多金属 )矿化集中区。成矿带在时、空和物质组成上主要受控于中生代火山 -岩浆侵入作用 ,形成多种金、铜矿床类型组合的成矿带。在分析成矿带内不同矿床成因类型的基础上 ,建立了该成矿带的成矿系列 ,即斑岩铜钼、火山热液金银、次火山热液金银铅锌成矿系列。将成矿系列控矿条件和火山 -岩浆侵入作用相结合 ,探讨成矿系列的构造环境和成矿模式 相似文献
6.
延边地区闹枝金矿为一破碎蚀变岩型金矿床,产于中生代火山盆地外缘的早海西期花岗闪长岩出露区,矿体严格受构造破碎带控制。本文从矿床产出的地质地球化学特征入手对区内岩浆岩与成矿的关系进行了系统研究,揭示出闹枝金矿与中生代火山杂岩有密切的成因联系.闹枝金矿为—燕山期钙碱性火山岩浆活动所形成的火山—次火山热液矿床.矿床形成于中温、pH值为弱酸—弱碱性、Eh值较低的弱还原—还原条件.成矿作用具有多阶段性。金主要以氯金络合物和硫金络合物形式迁移. 相似文献
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<正>研究区为北东向燕辽中生代构造-岩浆火山带,也是河北省沽源—内蒙古红山子—辽宁兴城铀钼等多金属成矿带,大地构造背景为西部是华北陆块北缘与内蒙古海西褶皱带交汇部位,是大兴安岭火山活动带的南缘,东部为燕辽古陆核增生及中生代 相似文献
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内蒙古陈家杖子金矿地质特征及资源潜力探讨 总被引：4，自引：1，他引：3
赤峰市南部地区位于北东向中生代大兴安岭岩浆火山岩带与华北地台北缘东西向构造的交汇部位,中生代岩浆火山岩带侵入并覆盖了前寒武纪结晶基底,形成了一套广泛分布的火山、次火山岩系,成矿地质条件优越.陈家杖子金矿床是近年来在该区发现的与中生代岩浆火山岩带有关的隐爆角砾岩(潜火山岩)型新类型矿床.通过对其地质、地球物理、地球化学特征的分析,初步认为陈家杖子金矿床应为一斑岩型金(铜)成矿系统的组成部分,目前查明的金矿体仅为矿床的顶部,其深部应赋存有规模更大的金、铜多金属矿体.该矿床具有上金下铜的特点,有较大的资源潜力.建议加强该矿床深部的勘查工作,对该矿床进行解剖、评价,以扩大资源远景,并建立矿床模型,指导区域矿产勘查工作. 相似文献
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南秦岭南部褶皱带是秦岭造山带的重要组成部分，随着找矿勘查工作的深入，相继发现了一系列金、银、锑、铅、锌、铜矿床（点），成为陕西省又一重要有色、贵金属成矿带。南秦岭南部元古宙至中生代多次发生火山成矿作用、沉积或喷流沉积成矿作用和构造-岩浆成矿作用，金、银、锑、铅、锌、铜成矿具有一定的规律，找矿前景好。从资源潜力及经济意义上来看，金应该是该区的主攻矿种。同时，应该兼顾银、锑、铅、锌、铜的找矿工作。开展自水江-留坝成矿带金、银锑找矿、牛山隆起北缘成矿带金铜多金属找矿和红椿坝断裂两侧铜金找矿是主要找矿方向。 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 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