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云南省者太地区金锑矿找矿预测-来自水系沉积物测量的证据 总被引:1,自引:0,他引:1
云南者太地区位于开远-丘北金成矿带东缘,该区及其周边已发现卡林型金矿和木利式锑矿床(点)20余处,具有良好的金、锑矿找矿前景。本文以1:5万水系沉积物测量19种元素含量数据为基础,统计分析了水系沉积物地球化学参数、元素相关性、成矿有利度系数等指标,总结了元素组合、富集贫化规律及其与地质背景、地质构造与成矿作用的关系。区内主要富集元素为Au、Sb、As、Bi、Cd,主要高分异元素为Au、Sb、As、Cd,且具有较高的成矿有利度系数。结果显示,Au元素异常严格受近东西向构造带、北西向构造带、北东向构造带,以及二叠系-三叠系不纯碳酸盐岩、硅质岩、细碎屑岩等因素控制;而Sb元素异常与近东西向构造带、台盆相沉积环境、泥盆系硅化灰岩(硅化碎屑岩等)有着密切联系。依据水系沉积物异常特征和成矿地质条件,圈定综合异常7处,划分出3个找矿远景区,指出了区内今后的找矿方向。 相似文献
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通过在甘肃临夏太子山一带开展1 ∶ 5万水系沉积物测量工作,初步查明了研究区1 874 km2范围水系沉积物的地球化学特征,依据元素组合特征、区域成矿地质背景等圈定综合异常31处,其中见矿异常19处,划分找矿远景区6个,优选找矿靶区10处,结合异常查证,确认大多数异常受岩浆岩和断裂构造控制,区内与酸性侵入岩有关且强度较高、元素组合较好的异常区有利于找矿。通过矿产检查新发现金、铜、铅、锌、锑等金属矿(化)点13处,取得了较好的找矿效果,为找矿选区提供了依据。 相似文献
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研究区位于临沧-勐海Fe-Pb-Zn-Au-Ag-Sn-Sb-Ge-REE成矿带.以临沧地区1∶5万水系沉积物测量获得的数据为基础,统计分析水系沉积物地球化学特征,依据元素组合特征,结合地质背景成矿条件,圈定综合异常10处,划分出4个找矿远景区,通过异常查证,探获较好稀土资源量.总结了水系沉积物地球化学异常与离子吸附型稀土矿的关系:异常中心能指示成矿母岩稀土元素富集地段,周边有利表生环境可富集成矿,为以后离子吸附型稀土矿勘查工作提供依据. 相似文献
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湘西南苗儿山地区地层发育较齐全,地质构造复杂,岩浆活动频繁,成矿地质条件良好.依据1/5万水系沉积物测量成果,分析研究了苗儿山地区水系沉积物地球化学特征,包括元素分布、元素相关性、异常元素组合及异常成因等,认为W、Mo、Bi、Cu、Pb、Zn元素为区内主要成矿元素,异常按地质成因可分为与花岗岩有关的异常、与北东—北北东向断裂构造有关异常、与地层局部富集有关异常三类,共圈定31处地球化学综合异常.综合区内成矿地质背景,优选了猫儿界-平滩钨锡多金属找矿远景区、杨荷岭-安堂坪金找矿远景区及周塘-茅坪铜铅锌金多金属找矿远景区. 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20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献