内蒙古哈达门沟金矿床13号脉构造叠加晕模式及深部找矿预测

哈达门沟金矿床13号脉受断裂构造控制,具有多期多阶段叠加成矿（晕）的特点.矿床分为4个成矿阶段,各成矿阶段元素含量和地球化学特征参数表明,金成矿与金属硫化物关系密切.第Ⅰ阶段成矿较弱,第Ⅱ、Ⅲ阶段为主成矿阶段,第Ⅳ阶段不成矿.确定矿床的头晕元素为As、Sb、Hg,矿体晕元素为Au、Ag、Cu、Pb、Zn、Bi,尾晕元素为Ni、W、Co、Mo.建立了原生叠加成矿成晕模式,矿脉在垂向上形成串珠状分布的多个富集矿体,各富集矿体上部存在头晕元素异常,中部对应矿体晕元素异常,下部存在尾晕元素异常,富集矿体之间存在头、尾晕元素共存区.总结了应用模式找矿的准则,认为在含矿构造带内,Au品位较低时,如果存在头、尾晕元素共存,则指示深部有矿,当再叠加Cu、Pb、Zn等元素异常时,指示深部矿体还很富.同时,利用构造叠加晕模式和深部预测标志对已知矿体深部进行盲矿体预测,在实践生产中得到了很好的验证.     

广西昭平大王顶金矿床深部盲矿预测的构造叠加晕模型

广西大王顶金矿为热液型金矿,成矿严格受岩体和构造控制,成矿具有多期多阶段叠加特点。文章总结了该矿床及不同阶段元素组合,在研究单一次成矿形成的原生晕轴向分带和识别出不同成矿阶段形成矿体(晕)在空间上的叠加结构基础上,建立了矿床的构造叠加晕模式,确定了盲矿预测标志,对矿床深部给出了盲矿靶位。     

构造叠加晕找矿法在云南省杨梅田铜矿床深部盲矿预测中的应用

云南省龙陵县杨梅田铜矿为中温热液型铜矿床,铜矿体的分布宏观上受上奥陶统第2层底部层位的控制,主要产于构造破碎带中。在系统研究赋矿地层和矿床的元素组合、成矿成晕的轴向分带及叠加特征基础上,总结了深部盲矿预测的构造叠加晕标志;根据矿床成矿规律和探矿构造圈定有利成矿空间,结合构造叠加晕原理,在有利成矿空间上方坑道或钻孔中的前缘晕叠加部位圈定盲矿体预测靶区,并对定位预测的靶区进行工程验证。验证结果证明了构造叠加晕找盲矿法在热液型铜矿深部盲矿体定位预测的有效性。     

山西灵丘刁泉矽卡岩型银铜矿床构造叠加晕模型

在研究山西灵丘刁泉矽卡岩型银铜矿床不同成矿阶段元素组合及矿床构造叠加晕特征的基础上,建立了矿床深部盲矿预测的构造叠加晕模型,用模型预测,取得了很好找盲矿效果。     

云南会泽县麒麟厂铅锌矿床构造叠加晕特征及找矿意义

麒麟厂铅锌矿床是云南省会泽矿区内的一个独立的特大型矿床,对该矿床10#矿体的构造叠加晕特征进行了研究,以实现矿床的深部找矿突破。研究表明:麒麟厂铅锌矿床10#矿体原生晕轴向分带序列从上到下为As、Sb、Hg、Ba、F→Pb、Zn、Ag、Cu、Cd、Ge→La、Li、Be、Sr、Bi、Mn、Co、Ni、V;在识别10#矿体群空间叠加结构的基础上,建立了构造叠加晕模式及其成矿指示,并以此对10#矿体进行了深部成矿预测,提出了1个找矿靶位和2个成矿有利部位,取得了较好的找矿效果,可应用于会泽矿区内矿山厂等其他矿床(段)的深部成矿预测,进一步表明构造叠加晕对沉积-热液强改造型矿床的适用性。     

构造叠加晕法在预测金矿区深部盲矿中的应用效果

在原生晕分带理论的基础上,根据不同成矿阶段的元素组合、不同成矿阶段矿体的轴向分带及其在空间上的叠加特点,建立起一种预测盲矿的新模式---构造叠加晕模式.构造叠加晕法在一些金矿区深部及其外围预测盲矿已取得了显着效果.     

甘肃李坝金矿床定位预测的叠加晕模式

李坝金矿具有多期多阶段叠加成矿成晕的特点,根据不同成矿阶段元素组合和单阶段形成原生晕的垂直分带规律（从上→下是As,Hg,Sb→Ag,Pb,Au,Cu,Zn→Bi,Mn)及不同成矿阶段形成矿体（晕）在空间上的叠加特点,建立了矿床的原生叠加晕模式,确定了盲矿定位预测标志。     

青海达达肯乌拉山铅锌矿床原生晕深部找矿预测

达达肯乌拉山铅锌矿床位于柴北缘成矿带南部,是近年来在泥盆系牦牛山组陆相火山岩中新发现的矿床。笔者对矿区00勘探线上3个钻孔岩心样数据,运用格里戈良原生晕分带指数法和构造叠加晕找盲矿法研究了原生晕特征。研究表明,Mo、Cu是铅锌矿体前晕,Sb是近矿晕,Au、As、Ag是矿尾晕;垂向分带序列由下向上为Ag→As→Au→Pb→Zn→Sb→Cu→Mo,序列具反向分带特征,铅锌成矿成晕是多次叠加的结果;矿(化)体轴向深部有前、尾晕叠加共存的重要信息,推测存在隐伏矿体。综上建立了该矿床深部找矿预测的成矿成晕模型。     

北祁连鹰嘴山金矿床原生晕地球化学特征及深部矿体预测

为探讨鹰嘴山金矿深部找矿潜力,解决资源危机,对主矿体开展了原生叠加晕研究。结果显示,原生晕轴向分带序列自矿体下部至上部为:Au-W-Mn-Zn-Hg-Sb-Cu-Co-V-Ti-Ni-Ag-B-Pb-Bi-As-Sn-Mo,出现"反向分带序列"现象,显示多阶段叠加成矿的特征;地球化学参数自地表向下有:增大→减小→增大变化趋势,矿体剥蚀参数随着标高的降低逐渐升高,且矿体下部前缘晕强度较大,尾晕出现弱异常,推测认为沿断裂延伸方向可能有盲矿存在,深部找矿前景良好。原生叠加晕方法在该区域目前应用较少,本次模型的建立和找矿标志的确定,为区域同类矿床成矿预测提供了新途径。     

勘查(新)区构造叠加晕研究方法及预测参照实用理想模型

构造叠加晕找盲矿法在可以建模的已知矿床深部预测盲矿已取得了显著效果。本文介绍了在尚未发现矿体、未建模的勘查(新)区采用构造叠加晕法预测盲矿的理论与方法,并根据作者总结建立的热液型金及有色金属矿床深部盲矿预测的构造叠加晕"实用理想模型",建立了在勘查(新)区预测构造-蚀变带深部含矿性的构造叠加晕"参照实用理想模型"。据此模型可快速、有效地对勘查(新)区各构造-蚀变带进行评价、深部预测,筛选出最有利成矿的构造蚀变带,提出有利成矿部位或预测靶位,从而缩小找矿范围,为进一步勘查提供依据。     

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

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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