贵州烂泥沟金矿成矿条件——岩石地球化学研究

黔西南中三叠统浸染型的烂泥沟金矿具有储量大，原生矿发育的特征。岩石学（无机）和岩石地球化学的综合研究表明，金矿源为深部上古生界或更老地层的沉积；浊积岩容矿不仅具有物理障（主要是压力和孔渗性）方面的因素，而且包含化学障（如活性铁和有机碳）因素；成矿溶液具有不，偏酸性特征。良好的深部矿源层，适宜的导矿和容矿构造，加上岩石适宜的物理－化学障等因素是烂泥沟金矿成为富矿，大矿的重要条件。     

河北省灵寿县石湖金矿的构造地球化学特征

本文通过对石湖金矿区地表（横向）及深部（纵向）构造岩石地球化学特征的分析，反映构造对石湖金矿岩石地球化学的影响和控矿作用，指出了构造地球化学的找矿方向。     

湖南龙山地区金矿床断裂构造地球化学特征

通过对龙山地区地表（横向）及深部（纵向）断裂构造特征及岩石地球化学特征的分析,反映构造对龙山地区金矿岩石地球化学的影响和控矿作用,指出了构造地球化学的找矿方向.     

贵州省贞丰县石柱金矿床地质特征及成矿模式

石柱金矿位于黔西南贞丰县,是烂泥沟金矿外围的一处小型卡林型金矿床。本文基于野外地质勘查工作和各类岩矿测试结果,系统总结了矿床的地质特征和矿石特征,指出矿区的矿体主要受构造控制,矿石工业类型为少硫化物微细粒浸染型难处理金矿石。矿化富集规律研究成果显示,矿体具有NEE向倾伏的特征,在深部有尖灭再现的可能;在此基础上,提出石柱金矿与烂泥沟金矿具有相似的成因,并建立了烂泥沟—石柱金矿田的成矿模式。     

黔西南烂泥沟金矿田构造变形及演化分析

烂泥沟金矿是滇黔桂“金三角”内的大型金矿床,具有重要的经济价值。其矿体产出严格受断层控制,构造控矿特征明显。本文通过对烂泥沟金矿及其邻区主要断层之次级构造现象进行详细的野外观察和力学性质鉴定,继而进行几何学、运动学分析,认为研究区构造变形特征分为伸展和挤压两类。其中,晚古生代—中三叠世安尼期早期为伸展阶段,而在安尼期中期及以后为挤压阶段,构造反转时间应为248 Ma或246 Ma稍后。根据作者地震解释剖面,烂泥沟—尾怀断层和隐伏的巧洛断层向下已经延伸到南盘江盆地变质基底,可能为成矿流体提供运移通道,且烂泥沟—尾怀断层南部有较好的地球化学异常和矿化显示,说明烂泥沟金矿深部及外围具有较好的找矿前景。     

浅析希勒阔腊金的成矿条件

从地质、地球化学、地球物理３个方面分析了希勒阔腊的成矿条件、大地构造位置、地层、岩浆岩、构造、围岩蚀变特征和矿产与矿化特征，说明该地区成矿地质条件有利；地层、岩属和水系沉积物、岩浆岩及原生晕的地球化学特征，说明该地区具有形成金（铜）矿床的专属性，两次生晕异常的诸多参数又表明其具有矿致异常的特征；磁场特征和地球化学特征反映该地区具有等间隔控矿（容矿）构造；所有这些都说明，希勒阔腊是寻找构造破碎蚀变者型或韧性剪切带型大、中型金矿的有利地区。     

贵州省烂泥沟金矿深部水文地质特征初探——以磺厂沟矿段为例

由于烂泥沟金矿区磺厂沟矿段水文地质条件是最初的以基岩裂隙潜水直接充水为主的简单类型,逐渐向碳酸盐岩溶水和构造裂隙承压温热水直接充水为主的复杂类型发生变化。因此在以往勘查工作成果的基础上,通过对磺厂沟矿段■号矿体11～31勘探线深部进行水文地质研究工作,初探烂泥沟金矿深部水文地质特征,对今后矿山勘查及防治水措施工作有一定的指导意义。     

辽三小佟家堡子金矿岩石地球化学及成矿条件研究

辽东小佟家堡子金矿为隐伏的大型微细浸染型金矿。矿体寄主岩石以变粒岩为主,次为大理岩、云母片岩。不同类型容矿岩石对比研究表明,具有良好渗透性,同时又是成矿溶液物理障和化学障的岩石是细脉浸染状矿床的最有利容矿岩石。围岩与矿石的地球化学特征综合研究反映了成矿溶液早期为氧化、偏酸性,晚期逐渐变为还原、偏碱性。矿化元素组合、矿化过程微量元素变化特征以及成矿溶液的演化等表明该矿床为浅成低温热液成矿。     

测汞在金矿床深部含矿性评价中的应用

首先介绍了汞化合物的地球化学特征及热释汞测试方法，并以冀西北水晶屯金矿为例，对矿床主要工业矿体的赋存地段（Ⅱ号矿脉），进行了深部含矿性评价。结果表明，不同的汞化合物在评价金矿床深部含矿性中具有很好的指示作用，其评价效果同微量元素评价效果相比有良好一致笥。     

深部矿阶梯找矿方法：以胶东金矿集区深部找矿为例

【研究目的】胶东是中国率先开展深部找矿并取得重大突破的地区，阶梯找矿方法在深部勘查中发挥了重要作用，研究深部找矿方法，有利于推动为中国“攻深找盲”找矿战略实施。【研究方法】本文基于胶东深部金矿找矿工作，研究了深部金矿成矿模式，分析了可控源音频大地电磁测深（CSAMT）、频谱激电测量（SIP）、大地电磁测深（MT）和反射地震等方法在深部找矿中的作用和效果。【研究结果】深部矿体常赋存于控矿断裂沿倾向的倾角变缓段，构成阶梯成矿模式，这一模式是地质构造作用与成矿物理化学条件等多种因素耦合的结果。深部矿阶梯找矿方法的要点是：在地表通过高精度地球物理探测，查明控矿断裂的深部结构和倾角变化，根据阶梯成矿模式预测深部矿的位置、规模。【结论】阶梯成矿模式为深部找矿提供了核心技术前提和可以识别的探测目标，CSAMT、SIP、MT和反射地震等方法能够探测控矿断裂的深部特征，多种地球物理方法组合是阶梯找矿方法的有效技术手段。     

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