北京市得田沟金矿床矿物特征和金的赋存状态

得田沟金矿床是受韧性剪切带控制的石英脉－蚀变岩型金矿床。容矿岩石主要为太古宙受混合岩化的角闪岩相变岩系。矿石矿物主要为黄铁矿、方铅矿、闪锌矿、黄铜矿、碲铅矿及金、银（铋）的单质和化合物等；脉石矿物主要为石英、方解石、绿泥石、绿帘石、绢云母、阳起石等。Ａｕ、Ａｇ（Ｂｉ）主要呈细粒自然金、自然银、碲金银矿、针碲金银矿、碲银矿、六方碲银矿、螺状硫银矿、未定名矿物ＡｇＳ１＋ｘＴｅ１－ｘ和Ｂｉ５Ｔｅ６存在。     

河南祁雨沟金矿针硫铋铅矿的初步研究

利用反光显微镜、MPV-1型显微光度计、JCXA-733型电子探针、X射线粉晶分析等手段对产在河南祁雨沟爆破角砾岩型金矿中的针硫铋铅矿进行了研究。获得其平均化学成分为:S 16.36％,Cu 10.14％,Bi 41.14％,Pb 33.07％。硬度为161.9kg/mm~2,比重为7.1。该针硫铋铅矿常和硫铋铜矿、辉碲铋矿、碲银矿、自然金、银金矿等密切共生,产在形成温度相对较高的爆破角砾岩型和石英脉型金矿中。     

胶东牟平-乳山金矿带金青顶金矿碲化物矿物的特征及沉淀机制

通过光学显微镜、电子显微镜并结合能谱分析,在金青顶金矿Ⅱ号矿脉深部除含碲化物碲银矿、碲金银矿和碲铋矿外,首次发现碲金矿的存在,进一步证实了前人对于该矿床中存在碲金矿这一新矿物的推测,也打破了该金矿深部无碲金银矿的传统认识。这些碲化物呈连生体或者细脉状产于黄铁矿等硫化物、石英与黄铁矿裂隙中。在金银碲化物矿物中,Te含量变化较小,Au含量变化较大,与Ag呈负相关,与Bi为正相关。结合金-银-碲矿物成分-共生图解,对金银碲化物矿物的共生组合特征进行了研究。研究表明,Te总是优先与Ag结合形成碲银矿或碲金银矿,只有热液中Ag被消耗后才与Au结合形成碲金矿,最后Te被耗尽,矿液中残留很多的Au,从而形成自然金,说明随着成矿过程的演化,成矿热液可能逐渐富金,具体表现为碲银矿-碲金银矿-碲金矿-自然金的析出顺序。     

黑龙江三道湾子金矿Au-Ag-Te系列矿物特征及其成矿流体

本文采用光学显微镜、扫描电镜和电子探针对黑龙江省三道湾子金矿中Au-Ag-Te系列矿物碲银矿、碲金银矿、针碲金银矿、斜方碲金矿和碲金矿进行了详细的矿物学研究,本次研究还发现Au2Te的存在。碲化物矿物多呈粒状或脉状分布于石英或硫化物矿物的裂隙中。Au-Ag-Te系列矿物中,Au含量与Ag含量呈负相关性,与Te含量呈弱的负相关性。结合Au-Ag-Te成分共生图解及镜下特征对金银碲化物矿物共生组合进行分析表明Te优先与Ag结合形成碲银矿或碲金银矿,只有成矿流体中Ag被大量消耗后,Te才与Au结合形成针碲金银矿、斜方碲金矿、碲金矿,最后当成矿流体中Te也被大量消耗后,Au才会形成自然金。氦、氩同位素研究表明石英—黄铁矿阶段流体包裹体中3He/4He值为0.01～0.03Ra,金银碲化物阶段3He/4He值为0.08～1.04Ra,指示金银碲化物阶段有大量地幔物质参与。     

小秦岭金矿田中的两种罕见矿物—碲铅铋矿和自然碲

碲铅铋矿和自然碲产于河南省小秦岭含金石英脉矿床中。碲铅铋矿化学成分平均值(%)为:Te44.06,Bi40.24,Pb14.23,并含有微量的Ag、Au、Hg、Fe、Ni、Cu等元素。理论化学式为(Bi,Pb)_3Te_4,其中Bi>Pb。共生矿物有自然金、碲金矿、破银矿、碲铅矿、碲金银矿、碲铋矿;方铅矿、闪锌矿、黄铁矿、黄铜矿等。 自然碲反射色为纯白微带乳色,非均质性清楚,偏光色为蓝灰-棕灰色。显微硬度为H_v=85.1kg/mm~2(25g)。共生矿物有碲金银矿、碲银矿、黄铜矿等。化学成分中碲含量达98.44％,并含Ag、Cu、W、Fe、Pt等微量元素。     

西澳大利亚LadyBountiful矿山金矿化：以花岗岩类为主岩的太石代

ＬａｄｙＢｏｕｎｔｉｆｕｌ脉金矿位于中绿片岩相变质的ＯｒａＢａｎｄａ绿岩层中，主要以构造晚期Ｌｉｂｅｒｔｙ花岗闪长岩为主岩。金矿化沿石英脉状的，左旋的脆性断裂带产出，此断裂带横切Ｌｉｂｅｒｔｙ花岗闪长岩和Ｐｌｅａｓａｎｔ山岩床。石英脉的结构表明，与金有关的单脉发育分为２个阶段，高品位矿化局限于第２阶段。矿石矿物包括黄铁矿，黄铜矿、磁黄铁矿、方铅矿、闪锌矿、Ａｕ－Ａｇ－Ｂｉ－Ｐｂ－碲化物和自然金。流     

吉林小西南岔金铜矿床的金属矿物及矿石特征。

小西南岔矿床是与燕山期花岗岩有关的斑岩矿床，以金、铜为主，伴有银、铋矿化。金属硫化物主要是黄铁矿、毒砂、磁黄铁矿、黄铜矿。金矿物是金－银系列的自然金、银金矿及金银矿。金的成色低，平均成色７２８，且变化在３０５～９９３这一较大范围内。另外，还发现了碲银矿、硫碲银铋铅矿、自然铋、赫啼铋矿、富硫铋铅矿等多种银、铋矿物。成矿早期只有微弱的铜（钼）矿化，大量金和铜富集于成矿中期（２１０～４７５℃），而银、铋矿化则出现在成矿作用晚期（１６０～２４０℃）。     

西藏尕尔穷铜金矿金矿物特征研究

尕尔穷铜金矿床是班公湖-怒江成矿带西段第一个达到详查程度的矽卡岩型铜金矿床。通过对矿床中金矿物的电子显微镜观察和扫描电镜能谱分析,查明了金矿物的类型及赋存状态,划分了成矿阶段。研究表明,金矿物有银-金矿物系列、铜-金矿物系列和少量碲化物类,主要有自然金、银金矿、金银矿、铜质金银矿、铜金矿、铜质银金矿和碲金银矿。金矿物主...     

胶东金矿中含铋不透明矿物的发现及其地质意义

本文介绍了胶东金矿中发现的几种含铋不透明矿物:自然铋、针硫铋铅矿、板硫铋铜铅矿、辉碲铋矿,对它们的产地、化学成分、光学性质等进行了阐述。这几种矿物在胶东金矿中的出现具有重要的地质意义。     

山东乳山金矿中金-银碲化物的矿物学特征与沉淀机理

通过显微鉴定和应用电子探针微束分析,查明乳山金矿中碲化物主要为碲银矿和碲金银矿,少量碲铅矿和碲铋矿,它们呈密切共生的集合体或联生体产出在黄铁矿等硫化物及石英等脉石矿物粒问或裂缝中。碲银矿和碲金银矿中Au含量变化较大,w（Au）为痕量至26．1％,与银呈负相关,与铋为正相关,可能是以类质同象形式替代Ag进入到碲银矿中;碲铅矿中未检测到金。金在金-银碲化物中的含量随温度降低而升高,相关矿物的形成顺序为碲银矿-碲金银矿-（碲金矿）。将金银碲化物成分投到Au-Ag-Te三元成分,共生图解上发现,它们都不是标准成分的端元矿物,推测这些碲化物（尤其是金银碲化物）是在非平衡状态下快速沉淀形成的,可能与含矿浠体的闻歇忡沸腾作用有关。     

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