新疆哈密清白山铅锌矿矿床成因及成矿模型探讨

在总结清白山铅锌矿矿床地质特征、控矿因素的基础上,通过与MVT型矿床典型特征对比,认为其成因类型为MVT型。通过总结控矿因素,讨论了成矿时代,初步建立成矿模型,认为矿床成型分为含矿流体沉淀的主成矿期、构造改造期、岩浆改造期3个阶段。     

安溪青洋石墨矿床地质特征及其成因探讨

安溪青洋石墨矿矿源层为该区二叠系童子岩组第三段煤层,受成矿期后断裂构造以及岩脉侵入的影响,属后期热液接触变质层控矿床.通过对该区成矿构造条件及热液变质作用的关系的研究分析,探讨了石墨矿床的成因以及控矿条件,为周边地区找矿提供了方向.     

西秦岭铅锌矿床的层控多样性与岩相、Ⅱ级构造单元控矿

通过系统归纳西秦岭铅锌矿床的赋矿地层、Ⅱ级构造单元控矿事实认为,矿床的层控多样性在矿田域表现为时控和岩相控矿,层、相、位控矿模式在矿田具有普遍性;在更大的区域上则主要表现为岩相和Ⅱ级构造单元控矿。板内环境下的拉张和陆内叠覆环境下的具走滑性质的俯冲分别形成了热水沉积型和沉积改造型铅锌矿床;沉积成矿期盆地的裂陷程度及改造成矿期沿深断裂活动的岩浆作用决定了铅锌矿床产出的Ⅱ级构造单元。控矿因素的地球化学表征为铁族元素、亲硫元素与亲石元素三位一体产出。     

西秦岭铅锌矿床的层控多样性与岩相、Ⅱ级构造单元控矿

通过系统归纳西秦岭铅锌矿床的赋矿地层、Ⅱ级构造单元控矿事实认为,矿床的层控多样性在矿田域表现为时控和岩相控矿,层、相、位控矿模式在矿田具有普遍性;在更大的区域上则主要表现为岩相和Ⅱ级构造单元控矿。板内环境下的拉张和陆内叠覆环境下的具走滑性质的俯冲分别形成了热水沉积型和沉积改造型铅锌矿床;沉积成矿期盆地的裂陷程度及改造成矿期沿深断裂活动的岩浆作用决定了铅锌矿床产出的Ⅱ级构造单元。控矿因素的地球化学表征为铁族元素、亲硫元素与亲石元素三位一体产出。     

吉林大东南岔金铜矿床地质特征及控矿条件分析

本文简要地介绍了矿区的成矿地质背景及主要矿床的地质特征,重点阐述了控矿因素,分析了区内下古生界五道沟群变质岩系、华力西晚期至燕山期侵入岩以及主要断裂构造与成矿作用的关系。通过对大东南岔金铜矿床控矿条件进行分析、评价,为区内及外围找矿提供依据。     

吉林爱林金矿成矿物质来源及成矿机理研究

通过对爱林金矿床的控矿条件分析,矿床地质特征阐述,探讨了成矿物质来源、成矿热液来源、矿床成因及成矿机理。成矿与燕山期次火山活动密切相关,矿床成因类型属浅成次火山热液型。     

桂北黑刚地区锑矿地质特征及控矿条件

近年在黑刚地区锑矿找矿获得新进展。作者总结了该区矿床地质特下及控矿条件，肯定锑矿属印支－燕山期下热水渗滤富集低温热液辉锑矿脉型矿床，地层岩性及断裂构造的多级控制是锑印成矿的主要控矿因素，最后提出找矿标志及有利靶区。     

吉林爱林金矿成矿物来源及成矿机理研究

通过对爱林金矿床的控矿条件分析,矿床地质特征阐述,探讨了成矿为源、成矿热液来源、矿床成因及成矿机理。成矿与燕山期次火山活动密切相关,矿床成因类型属浅成次火山热液型。     

山东蒙阴西峪矿区深部与外围金刚石矿床地质特征及成因

山东蒙阴西峪金刚石原生矿床位于华北克拉通东缘。结合区域地质背景、矿床和矿（化）体地质特征,对该矿床的成矿地质条件、控矿因素和矿床成因进行研究。结果表明,断裂是该矿床主要的控矿因素,矿床的形成及分布与区域NNE向沂沭断裂带、上五井断裂和NWW向新泰—垛庄断裂、铜治店—蔡庄断裂有关,金刚石矿大多产于这些断裂的交接复合部位,是金伯利岩浆的运移通道和储存空间;金刚石是加里东期金伯利岩浆作用的产物。     

延边-东宁成矿区带金矿资源预测与找矿远景

通过对延边-东宁成矿区带地质特征、控矿条件及典型矿床的研究,总结了延边-东宁成矿区带的控矿地质条件及成矿规律,应用矿床定位预测系统(DPIS),对延边-东宁成矿带进行了成矿预测,结合区内的控矿条件及成矿规律划分了找矿远景区.     

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

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.)