胶东邓格庄金矿深部地球化学及预测

通过对胶东邓格庄金矿深部（－225m～-345m)进行地球化学原生晕研究，结果表明Ⅰ2号脉的原生晕具有正向分带的特征，Ⅱ号脉的原生晕呈反向分带。据此推测在－345m以下地段Ⅰ2号矿体延伸不大，而Ⅱ号脉在－345m以下地段还有盲矿体的叠加。     

山东省牟平邓格庄金矿Ⅱ号矿体深部预测

牟平邓格庄金矿为一富黄铁矿石英脉型金矿床,其Ⅱ号矿体金品位及其厚度数据处理表明矿体具有向北侧伏的规律.Ⅱ号矿体深部(-225~-345 m)地球化学原生晕研究表明,其原生晕呈反向分带.据上述研究推测Ⅱ号矿体-345 m以下地段还有盲矿体的存在.     

胶西北上庄金矿床原生晕轴(垂)向分带特征及深部矿体预测的勘查地球化学标志

文章应用格里格良原生晕分带指数方法,系统研究了上庄金矿单个矿体、矿区等不同取样系统的原生晕轴(垂)向分带特征.结果表明,上庄金矿床原生晕轴(垂)向分带序列及原生晕叠加模式在矿区范围内比较相似,因此,可利用典型矿体原生晕轴(垂)向分带规律来指导矿床内深部矿体的预测.适用于该矿区-750 m以上的原生晕轴(垂)向分带序列为B-(Hg W Bi)-(As Mn Co)-Zn-(Au Ag)-Pb-Mo.典型矿体原生晕叠加模式显示,沿垂直方向矿体间断部位原生晕出现头、尾晕同位叠加以及头、尾、近矿晕同位叠加2种情况,并均呈现出地球化学参数的剧烈波动.其中,前者是下部有盲矿体存在的反映,而后者则有可能既是深部有盲矿体存在,也是2个矿化带或大矿体间有小矿体存在的反映.依此认识对深部矿体开展了预测,部分靶区已获得成功验证.     

湖南临湘虎形山钨矿原生晕地球化学特征与深部找矿预测

为预测湖南临湘虎形山钨矿床主矿体的深部变化趋势,在矿床地质特征和矿床成因研究的基础上,开展了野外地质调查和原生晕地球化学研究。微量元素统计分析表明,矿体的前缘晕元素为Ag、Zn、Au、Pb、Be、As、Cu,近矿元素为W、Bi,尾晕元素Sb、Sn、Mo。24号勘探线的钻孔原生晕数据表明,矿体自上而下其原生晕轴向分带序列为:Ag-Zn-Au-Pb-Be-As-Cu-W-Bi-Sb-Sn-Mo,具有"头尾晕共存"和"反分带"特征。结合矿体原生晕轴向分带模式,预测矿体向深部(-350 m以下)有一定的延伸或深部有盲矿体的存在。     

广东京村金矿床原生晕分带特征对深部找矿预测的启示

京村金矿床位于华南两广交界的云开地区,距河台金矿田约5 km,是近些年河台金矿田外围找矿的重大突破,已达中型规模。与河台金矿田中金矿床类似,京村金矿床的金矿体也严格受韧性剪切带控制。不同的是,前者主要产于云开群糜棱岩化的混合岩中,后者则产于糜棱岩化及碎裂岩化的花岗岩中。为指导深部勘探工程部署,选择V1矿体进行原生晕分带特征研究。通过对12种微量元素的多变量统计分析表明,该矿床具有中-低温热液型金矿床的特征,Au与Cu、As、Sb的正相关性显著,对找Au有较大的指示意义。4号勘探线原生晕轴向分带序列从上至下:Pb-Bi-W-Mo-Ag-Cu-Hg-Zn-As-Sb-Ba-Au,呈现出"反向分带序列"特征。结合地球化学参数在地下深处的转折变化规律及V1矿体尾部的前尾晕叠加共存的特征,推测标高-500 m以下可能有隐伏矿体的存在。根据以上成矿成晕元素的地球化学特征,建立了V1矿体的原生晕叠加理想模型。     

中国主要类型金矿床的原生晕轴向分带序列研究及其应用准则

汇集了中国６３个典型金矿床的原生晕轴向分带序列,统计出了中国主要金矿类型、不同规模矿床的原生晕轴向分带序列的共性和特性,总结出了中国金矿床原生晕轴向分带序列及其应用于盲矿预测的准则     

冀西三道沟金矿地球化学特征及深部找矿预测

解析三道沟金矿地球化学场,利用聚类分析得出3号矿脉主成矿元素、并伴有多种元素的综合原生晕;厘定金矿床的地球化学原生晕横向分带、垂向分带及纵向晕异常特征;确定了原生晕垂向分带序列,并建立矿床晕地球化学模式;优选找矿靶区,对深部隐伏金矿体进行定位预测。     

河南萑香洼金矿原生晕地球化学特征和深部找矿预测

河南熊耳山地区是豫西重要的金矿化集中区,萑香洼金矿是该成矿带近几年新发现的金矿床.通过运用地球化学成矿指数、聚类分析和因子分析的理论与方法,解析了萑香洼金矿的地球化学场,得出如下主要研究成果:①金矿床F985矿脉呈现以Au、Ag为主,伴有Pb、Zn、Cu、Bi、As、Sb等多元素的综合原生晕;②厘定金矿床的地球化学原生晕的轴向分带、横向分带和纵向分带;③原生晕轴向分带序列:头晕元素组合为As、Sb、Ba,主成矿晕元素组合为Au、Ag、Pb、Zn、Cu、Mo,尾晕元素组合为Co、Ni、Bi;④依据综合原生晕异常套合的特征,优选了4个找矿靶区,对深部隐伏矿体进行定位预测.     

河南省栾川县红庄-元岭金矿床原生晕轴向分带特征及深部成矿远景评价

红庄-元岭金矿床位于豫西熊耳山金及多金属成矿带南亚带上,是近年来发现的中型金矿床。通过对该矿床地质特征、成晕元素共生组合及分带特征的研究,认为该区原生晕分带序列整体为正常序列,49号勘探线中存在前缘晕元素与近矿晕元素叠加共存的现象。地球化学参数反映了该区成矿具多期多阶段的特点,部分参数在深部有向高值转折的趋势,Au及近矿晕元素异常规模向深部具有增大趋势,表明深部有一定找矿潜力。结合原生晕轴向序列特征及地球化学参数、异常规模随深度的变化特征,认为浅部找矿的重点应放在海拔约400m以上,攻深找盲的重点应放在海拔300m以下。     

河北水晶屯金矿元素垂向分带序列及原生晕空间特征

以河北崇礼水晶屯金矿为例，选择了与金矿化关系密切的１４种指标元素，分析研究了该矿床金的指示元素的垂向分带序列及原生晕的空间发育特征，并建立了该矿床综合地球化学原生晕模型。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

正~~     

GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)     

GEOCHEMISTRY

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