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始兴地区位于湘赣粤三省交界处,南岭成矿带的东段。区内成矿地质条件优越,钨锡、稀有及稀土金属矿产均较为丰富,其中钨和锡都是我国的优势矿产资源,其矿床尤其引人注目。本文在1∶5万水系沉积物测量成果资料的基础上,对粤北始兴地区的W、Sn、Mo等14种元素地球化学特征进行了初步总结,发现该区与钨有关的成矿伴生元素丰度均远大于区域元素丰度,其中W平均值为37×10~(-6),峰值为2980×10~(-6),Sn平均值为21×10~(-6),峰值为787×10~(-6);元素分布特征显示中下泥盆统是区内W、Mo、Bi等元素的主要富集层位,燕山期侵入岩中Sn、Bi、Wo、W、Zn等元素富集程度也较高;数理统计显示区内W、Sn、Mo、Bi、Pb、Ag等元素之间相关性较强;R型聚类分析显示区内元素组合主要有W-Mo和Pb-Zn-Ag等;因子分析显示区内的主要成矿组合为W-Sn-Mo-Bi-CuPb-Zn-Ag。本次工作共计圈定了21个以W-Sn为主的组合异常,并在空间上形成北北东向和近东西走向的两个综合异常带,结合区内成矿地质条件和异常检查工作,优选了南山坑和良源综合异常区为区内成矿远景最好的靶区。本文以南山坑综合异常区为例,指出该区良好的钨锡多金属矿找矿前景,同时该区的找矿方向可从传统的石英脉型黑钨矿向矽卡岩型钨锡矿和岩体型钨钼多金属矿转变,进而在该区实现找矿突破。 相似文献
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本文通过在西藏邦卓玛地区开展的1∶10000土壤地球化学测量工作,运用元素的变化系数、元素富集离散特征对邦卓玛地区土壤地球化学测量的12种微量元素进行地球化学统计分析,论述了12种微量元素的成矿潜力,得出Au、Ag、W、Pb、Sb 5种元素具有较大的成矿潜力。并通过相关分析、因子分析确立了测区内元素组合特征,共划分了三组主成矿元素组合(即Au-Ag-Cu-Bi-W;PbSn;Sb),运用衬值异常法在区内圈定组合异常,结果显示,组合异常明显,异常套合较好,大体呈NW向串珠状展布。根据组合衬值异常叠加,在研究区内圈定了4个重点靶区,为下一步在该区内寻找Au、Ag、Sb、W、Pb等多金属矿提供了理论依据。 相似文献
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在成矿作用地球化学与勘查地球化学分析的基础上,选取W、Sn、Mo、B i、Cu、Pb、Zn、Au、Ag、As、Sb、Hg共十二种元素作为南岭地区钨矿勘查的重要指示元素。对这十二种指标元素采用等权平均归一化,相关系数加权累加归一化和异常能归一化三种方法进行处理,都可较好地反映该区钨元素的矿化信息,且均比钨元素单指标异常信息效果显著。相关系数加权累加归一化指标主要反映钨元素信息,而等权平均归一化指标和异常能归一化指标主要反映成矿元素的共同矿化信息,这二者在南岭地区对钨矿成矿信息都具有较好的指示作用。 相似文献
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青海大坂山地区水系沉积物测量元素组合分区 总被引：3，自引：0，他引：3
采用R型因子分析方法,对大坂山地区水系沉积物地球化学测量所取得的数据进行了统计处理,提取了具有代表性的6种因子组合类型,并利用各因子组合得分值进行了地球化学分区,制作了元素组合分区图,由此将工作区内全部水系沉积物样品所反映的地球化学统计信息以区块的形式反映在一幅图中,通过对该图的判读分析,不仅反映了不同地段中以相应元素组合类型为主的地球化学异常和其地质成因信息,也揭示出相应元素的背景含量特征,为从整体上认识该区地质、地球化学成矿特征提供了简明、清晰的参考资料. 相似文献
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依据1:5万水系沉积物测量资料,对雄梅地区水系沉积物地球化学特征进行了初步分析。通过对元素分布、元素相关性、单元素异常、组合异常等特征的研究表明,该区Pb、Zn、Au、W、Sn、Bi等元素具有一定的成矿潜力,结合野外异常查证工作,推断大多数异常受岩浆岩和构造作用控制,区内与酸性岩体有关且强度较高、元素组合较好的异常区有利于成矿。依据水系沉积物综合异常的圈定,结合区内成矿地质构造背景,进一步优选出赤打日钨锡多金属矿、查江铅锌多金属矿2个远景区,并在后续的野外工作中得到了相应的验证。 相似文献
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藏东达翁金矿区位于班公湖-怒江成矿带东段,其成矿地质背景和成矿地质条件优越。为研究该矿区找矿潜力,利用SPSS软件对1∶10000土壤地球化学测量获得的Au、Ag、Cu、Pb、Zn、As、Sb、Mo、W、Bi等10种元素数据进行多元统计分析,运用元素异常NAP值累加方法和组合元素NAP值异常评序方法分别对各元素的成矿潜力及综合异常的找矿潜力进行评价。结果表明：区内矿化与中酸性岩浆热液有关,Pb、As、Sb、Ag、Bi是矿化体前缘晕指示元素,Au是主成矿元素,W是近矿指示元素,Cu、Mo是矿化体尾晕指示元素;Au的成矿潜力最大,Bi、Mo成矿潜力较大,Sb、Ag有一定的成矿潜力;区内共圈定土壤地球化学综合异常5个,其中HS-1综合异常找矿潜力最大,其次是HS-4综合异常。结合成矿地质特征和异常查证结果认为,区内具有寻找隐爆角砾岩型金矿、斑岩型钼金矿的巨大潜力及热液型银锑铋多金属矿的较大潜力。 相似文献
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衡阳盆地北缘国庆矿区土壤地球化学特征及找矿方向 总被引：1，自引：0，他引：1
对国庆矿区开展了1∶10000地质简测,在了解矿区地质特征的基础上进行了1∶10000土壤地球化学测量工作。Cu、Pb、Zn、Au、Ag、W、Mo7种微量元素含量特征(变异系数、富集系数和浓集比率)显示,Cu、Au、W元素为区内成矿有利元素。运用统计学软件SPSS19对7种微量元素含量值进行R型聚类分析和R型因子分析,划分出Cu-Pb-Ag和Au-Mo两组主成矿元素组合。采用衬度异常法对成矿有利元素和两组主成矿元素组合进行处理成图,共圈定了2个异常靶区。经过地表工程和深部工程验证,确定了一条一定规模的工业铜矿体。 相似文献
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为查明曙光石场地区各成矿元素和矿(化)体的分布特征,在1∶2万土壤地球化学测量的基础上,对研究区多种成矿元素进行聚类分析和因子分析。研究表明:区内Ag、Pb、Zn、Bi、Sn单元素异常个数多、变异系数值较高,具有较强的成矿潜力;区内Ag-Pb-Zn元素组合异常套和极好,异常强度较强,与岩浆热液型成矿作用相关,具有较好的找矿前景;根据单元素异常的套合情况及元素共生组合规律圈定组合异常六处并进行了槽探工程验证,在Ht-4组合异常处发现一铅锌银矿点,矿体、矿化体产于上石炭统唐家屯组流纹质凝灰岩中。 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