勃利金山金矿化区土壤地球化学异常特征及矿体预测

根据金山金矿化区20 km2土壤地球化学测量结果,运用聚类分析和因子分析,显示Au与Ag、As、Sb相关性较好,可作为金矿找矿间接指示元素;并通过计算各元素背景值及异常下限,圈定出9处金异常和其他元素异常35处。区内主要发育含硫化物蚀变岩型和含硫化物石英脉型金矿体。其中北西向断裂控制矿体走向,为重要的控矿构造。综合地质条件及元素异常特征,预测并圈定出3个Ⅰ级靶区和2个Ⅱ级靶区,并在Ⅰ级靶区经地表槽探工程验证,发现并控制14条矿体。     

福建安村金矿地质找矿的再认识

安村金矿地球化学异常规模大,特征好,并具良好的成矿地质背景,以往做了一些地质工作,但找矿尚未突破.文章从火山构造控矿特征入手,通过对相关找矿信息的综合分析研究,初步建立了矿区火山构造控矿模型,在此基础上,优选了3处找矿靶区进行找矿预测评价.     

福建安村金矿地质找矿的再认识

安村金矿地球化学异常规模大，特征好，并具良好的成矿地质背景，以往做了一些地质工作．但找矿尚未突破。文章从火山构造控矿特征入手，通过对相关找矿信息的综合分析研究，初步建立了矿区火山构造控矿模型，在此基础上，优选了3处找矿靶区进行找矿预测评价。     

河南栾川Mo多金属矿集区构造地球化学特征及找矿预测

栾川Mo多金属矿集区位于华北陆块南缘与北秦岭造山带的结合部。本文在对栾川Mo多金属矿集区地质特征、构造控岩控矿特征总结的基础上,运用数学地质的方法对矿集区构造裂隙地球化学特征进行分析,根据构造地球化学异常特征圈出有利找矿靶区,工程验证取得明显的找矿效果。这表明构造地球化学-数学地质方法具有良好的找矿效果,为栾川Mo多金属矿集区开展深部矿产勘查工作提供了科学依据。     

小秦岭金矿带潼峪矿集区金的成矿规律与找矿预测

在调查分析的基础上,结合变质核杂岩构造特征,研究了小秦岭金矿带潼峪矿集区金的成矿规律与控矿因素,指出潼峪矿集区金矿床的成矿物质来自太华群,并受晚期岩浆和构造的控制,尤其是变质核杂岩构造系统及其剥离(滑脱)构造控矿特征非常明显。综合研究认为,区内佛头崖-狮子包地段、东交沟—佛头崖一带、岳王庙-王排沟地区与复背斜倾伏端是重要的找矿靶区,值得进一步深入工作,并可为老矿区找矿提供示范。这对在老矿区深部寻找金矿,把小秦岭西段的深部找矿工作推向新阶段,实现找矿突破,具有重要的现实意义。     

西藏班-怒成矿带多龙矿集区斑岩铜矿综合信息找矿预测

通过对西藏班-怒成矿带多龙矿集区的研究,提出了含矿花岗闪长斑岩的特征、构造与铜矿化体的关系、矿体围岩蚀变特征及找矿意义、矿体风氧化带特征、地层接触带与铜矿化的规律、铜矿化的物探异常特征、铜矿化的化探异常特征等8个成矿-找矿模型标志信息,组成找矿靶区定量预测数学模型的8个统计变量.针对区内地质工作基础较差的现实情况,将加权特征分析方法应用到多龙矿集区找矿靶区预测中,优选出10个具代表性的见矿钻孔,作为模型单元,对7个未知预测单元进行了定量预测,优选了找矿靶区.     

吉林省五凤—五星山金矿地区遥感地质特征与找矿远景分析

五凤—五星山金矿地区成矿受火山喷发机构控制,具有热液成矿特征。本区为构造控矿,特别是多种构造交汇处更利于成矿。通过遥感地质解译确定了本区的线性构造和环形构造,环形构造的成因与隐伏岩体有关。据此在多种构造交汇处为找矿首选靶区,并划分出找矿远景区,为今后在该区找矿指明了方向。     

延边东部金铜矿化区成矿规律与找矿方向

珲春东北部金铜矿化区与古生代、中古生代火山岩浆活动有关。通过对中生代火山岩及矿区地质特征,构造控矿特征及已知典型矿床的研究,提取多元综合成矿信息,总结出矿化区控岩、控矿条件及找矿标志,确定了区内找矿靶区和找矿方向,并对成矿远景进行了评价。     

GIS矿床定量综合预测在川滇黔接壤区铅锌多金属矿化域的应用

运用GIS矿床定量综合预测方法,在川滇黔接壤区铅锌多金属矿化域选取断裂、赋矿层位、地层组合关系、线环构造、构造复杂程度等控矿因素作为预测信息,提取找矿信息量,圈定和优选找矿靶区。以3 000m×3 000m作为基本统计单元格,选取NE向断裂、次级断裂构造、多个有利赋矿层位、线环构造交汇部分等控矿因素,提取变量信息,分析变量信息特征及变量计算结果优选找矿信息,通过分析单元信息量单元频数曲线,以横坐标1.3为临界值划分铅锌多金属矿床预测靶区,共划分出Ⅰ级靶区5个,Ⅱ级靶区6个,Ⅲ级靶区4个。     

元谋尹地金矿化区控矿条件及找矿前景

从地球化学特征分析中提取出矿化区控矿因素,矿化存在于海资哨岩组千枚岩、石英岩、石英片岩中,受地层岩性、韧性剪切破碎带的控制。圈出Ⅰ级靶区1处、Ⅱ级靶区2处。     

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