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依托于"北京市矿产资源潜力评价"项目自然重砂和化探专题,结合北京黄松峪地区的金矿分布特征,对已有的1:20万自然重砂和1:5万水系沉积物地球化学数据处理后,进行综合对比分析研究。结果表明:黄松峪地区金矿物自然重砂异常与地球化学异常,两者的吻合程度高,自然重砂异常完全在地球化学异常的范围内,且93%的范围存在于地球化学异常II级与III级富集带中,所圈出的自然重砂和地球化学异常能直接指示相应地质体的含矿性。同时,自然重砂异常亦表明,在一级异常点密集的区域,是寻找金矿的最有利部位。从而验证了,利用自然重砂对寻找金矿的有效性。 相似文献
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自然重砂(灰砂)资料的取得是普查勘探工作的一个基本组成部分,利用自然重砂提供的信息,可以指导追索原生露头或寻找砂矿.如何通过数据处理方法,尽可能多地利用重砂资料提供的信息,仍是一个值得探讨的问题.例如,在利用重砂资料来进行矿床统计预测时,我们会发现,重砂分布图上所标出的重砂特高异常值常常不能代表该异常所在预测单元的原生矿化强度.目前对于这些特高异常值的处理方法有:1.规定一个异常上限,将超过该上限的重砂异常值均用该上限值代替,或者全部弃之不用;2.根据地质人员的经验,将高异常值按某种比例分配给某些单元.这两种方法都有其缺陷,前者会漏掉重砂高值所提供的某些有用信息,后者带有较多的主观因素.本文将建立重砂的理想搬运模式,并据此导出一种重砂高异常值的比较合理的处理方法.这可能对于指导寻找原生露头或砂矿具有一定的意义. 相似文献
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主要探讨基于GIS的重砂数据的自动化解译,建立重砂空间信息库的实现过程.对单矿物建立重砂地球化学图、异常图;对多矿物进行空间的组合异常分析,建立组合异常图.在建立各类图形库的同时,建立相应的空间信息合成属性库.实现从标准重砂数据输入到空间图形数据库、信息库自动建立的自动化解译建库手段,为重砂在地学各领域的充分应用,提供了一个有用的空间信息合成库.目前,该模块已在我国试运行,服务于矿产预测、资源与环境评价等领域. 相似文献
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大面積重砂取样是与1:200,000地質測量同时進行的找礦方法之一。根据重砂取样的結果,就可以概略的了解取样地区的礦產种类及其分布情况,从而指出今后進一步進行普查工作的远景地区。这項任务完成的好坏,不僅取决于野外取样工作在重砂取样点的布置上,以及样品的規格等方面是否合理,而重砂礦物的室內分析工作也起着很重要的作用。由于大面積重砂取样在我國才剛剛开始,对服务于大面積重砂取 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 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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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