共查询到20条相似文献，搜索用时 46 毫秒
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东昆仑地区是我国重要成矿带,地球化学勘查作为该区基础性的勘查手段在区域找矿、矿区及其外围找矿发挥了重要作用。地球化学勘查工作中,异常下限的确定是圈定地球化学异常的基础和关键。拉浪麦钨多金属矿区地球化学勘查工作中利用传统统计法、EDA法、含量—面积分形法分别对土壤地球化学分析元素计算确定异常下限,并结合成矿地质条件对三种方法计算出的异常下限进行综合对比研究,发现EDA法得出钨等元素异常不漏掉隐伏矿床形成的矿致异常,从而达到快速精准高效的找矿效果,具有很好代表性。因此,在东昆仑地区寻找钨多金属矿地球化学勘查中,采用EDA法确定异常下限是可行的。 相似文献
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西藏自治区乃东县劣布铜矿综合地质特征 总被引：1，自引：2，他引：1
文章介绍区域地质背景、矿区地物化特征,对成矿时代、流体包裹体特征进行初步研究,并指出找矿远景,希望对矿区的矿产勘查具有借鉴和指导意义. 相似文献
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矿床是由地质作用形成的、具有开采利用价值的有用矿物的聚集地,由若干个经地质勘查圈定的矿体组成。由于地质勘查的阶段性,一定勘查阶段圈定的矿体往往只是一个矿区某些矿体或某个矿体的一些矿段,一个矿床的所有矿体往往是多个地质勘查报告(简称地勘报告)提交的。因此,一个矿床的矿区范围由多个地质勘查报告圈定的矿体的空间范围来界定。由于矿区内各个地质勘查报告的工作程度可能会不一致,因此整个矿区的工作程度需要重新确定。总结了矿区范围的划分原则,并对矿区勘查程度的确定提出了定性原则和量化模型。这些原则和模型不仅成功指导了"全国矿产资源利用现状调查成果集成与应用"项目中矿区范围的划分和矿区勘查程度的确定,对评估整装勘查区内矿床的勘查程度、合理部署整装勘查区找矿勘查工作及合理设置采矿权均具有现实的参考价值。 相似文献
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对土屋地区干旱荒漠景观地球化学条件和勘查地球化学方法进行了分析，对比研究了不同比例尺地球化学异常特征及对矿床的反映能力，指出了该区铜元素是预测铜矿的最重要的指示元素，论证了在区域铜高背景区和异常区开展1：5万化探是进一步定性、定位预测矿区、矿床的重要环节，提出了东天山地区经济、有效的地球化学勘查和异常查证方法技术组合。 相似文献
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关于矿田地质学的初步探讨 总被引：5，自引：1，他引：4
依据板块构造理论和构造-矿床组合规律,在数千-数万平方千米的范围内,基本掌握了不同级别的金属成矿区带.通过成矿模式和成矿系列研究,也在矿区周围不断发现一些新矿床.然而,如何开展矿田范围内地质找矿,国际上称为中尺度勘查的潜在矿产的识别标准、调查思路、勘查方法等问题,则成为国际成矿学发展所面临的严峻挑战. 相似文献
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拜仁达坝矿区位于大兴安岭西坡银多金属成矿带,是近年来新发现的又一大型银多金属矿床.内蒙古自治区第九地质勘查院对矿区进行了详查①.对矿床的成因、成矿流体等方面的研究尚未见报道. 相似文献
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青海东昆仑下得波利铜钼矿花岗岩地球化学特征 总被引：1，自引：0，他引：1
下得波利铜钼矿地处青海省东昆仑成矿带,矿区位于诺木洪乡镇西南约80 km处.该区的地质工作始于20世纪50年代,青海第五地质矿产勘查院2009年在化探异常查证过程中发现了该矿,实现了东昆仑成矿带斑岩型找矿的重大突破.本区以往的地质研究程度很低,前人有对成矿斑岩的地球化学、年代学和成矿流体做了研究,但笔者在野外调研过程中发现,下得波利铜钼矿床的铜钼矿化也有发生在矿区破碎花岗岩中,相关研究较少,笔者详细地研究了花岗岩主量、微量、稀土元素特征,以期探讨矿床地质特征,矿区内岩浆岩的形成环境及矿床成因问题,为本区进一步寻找斑岩型矿床以及区域成矿物质来源和成矿规律的研究提供了新的资料. 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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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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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