福建邱村金矿床控矿因素及成因

邱村金矿矿体严格受构造、次火山岩、次火山隐爆角砾岩控制，通过对矿石黄铁矿Pb、S同位素分析以及相邻矿区成矿温度的对比研究，金矿成矿物质来源于元古宇麻源群深变质岩系，成矿热液来源于火山岩浆期后分异的热液，该矿床属火山岩中－低温热液型金矿床。     

闹牛山铜矿床次火山岩及与成矿的关系

论述了闹牛山铜矿床的地质特征，着重阐明铜矿床受火山机构、次火山岩，隐爆角砾岩控制，并将隐爆系统角砾岩划分为隐爆角砾岩，隐爆震碎热液角砾岩和隐爆破裂隙带三种类型。讨论了火山岩岩石化学、稀土元素特征；次火山岩，隐爆系统然砾岩与成矿关系，硫同位素特征，爆裂温度特征，并提出了闹牛山铜矿为与次火山岩有关的浅成中低温热液矿术。     

赣杭火山岩带潜火山岩型铀矿床及其成矿机制

赣杭火山岩带中生代强烈的火山喷发及浅成-超浅成潜火山岩浆侵入,造就了火山-潜火山热液型铀矿床成矿作用。与潜火山岩具空间和成因关联、成矿作用受潜火山岩浆活动控制的铀矿床,应归属为潜火山岩型铀矿床。潜火山岩型铀矿床赋矿围岩以酸性潜火山岩为主,矿体形态主要为脉状,共伴生Cu、Ag、Au等元素,矿石金属矿物及围岩蚀变特征与我国东部潜火山岩型多金属矿床具相似性。火山-潜火山岩浆活动及分异演化完善,促使成矿物质在热液体系不断浓集及成矿流体演化,在成矿流体温度、压力、化学成分改变及气液沸腾机制作用下,铀在断裂构造及其旁侧裂隙构造、潜火山岩内外接触带及围岩裂隙密集带、隐爆角砾岩及其内发育的隐爆裂隙带等容矿构造空间内沉淀。     

赣东南地区火山地质、矿产特征及找矿方向

赣东南火山岩区主要发育侏罗纪中、晚世中酸性火山碎屑岩－火山熔岩，其中以爆溢相产出的流纹质晶屑凝灰溶岩分布最广；火山构造主要发育破火山口、岩穹、隐爆角砾岩筒等构造，且与成矿关系；与成矿关系密切的次火山岩广泛发育。区内主要矿化类型为斑岩型、（次火山）隐爆层间裂隙带型、蚀变花岗岩型、隐爆角砾岩型，矿床成因均为与火山活动期后次火山（隐爆）活动有关的岩浆期后高－中温热液交代－充填型矿床。同时，矿床类型上具相互穿插性，隐爆层间裂隙带型、隐爆角砾型等矿床类型往往可以看作是斑岩型矿床的延伸；矿床空间分布上往往具有“一体多型”的特征。新矿化类型是赣南中生代火山岩找矿的重要方向。     

黑龙江金厂金矿区火山构造及其控矿特征

金厂矿区化类型主要有隐爆角砾岩型、构造蚀变岩型和黄铁矿及多金属硫化物细脉充填型，与其相对应的容矿构造分别为隐爆角砾岩筒，断裂和环状、放射状断裂。其中隐爆角砾岩筒和环状、放射状断裂是印支期花岗岩和燕山中－晚期闪长玢岩岩浆活动时伴生的火山－次火山构造,岩浆期后含矿热液充填其中并发生蚀变交代，形成了隐爆角砾岩型矿体及由黄铁矿－石英脉和多金属硫化物－石英脉充填的环状、放射状矿体。     

吉林省洮南市闹牛山铜矿床(吉林段)地质特征及成因探讨

闹牛山铜矿位于吉林与内蒙古交界处,矿体主要赋存于闹牛山火山机构边部和西侧次火山岩中的构造裂隙中,通过分析矿体的赋存状态和矿床成因,认为闹牛山铜矿在火山机构的外侧,矿化主要受断裂裂隙构造控制,属于次火山热液成因,在火山机构边部铜矿化在深部表现为斑岩型矿化特征,为以后在该地区的找矿提出了新的思路。     

景谷民乐火山灰流型铜矿地质及成因

民乐浸染状铜矿产于中三叠统灰流型富钠质熔结凝灰岩中。矿区火山岩主体为细碧角斑岩系，矿床的形成与陆内再生地槽海相火山活动及其4后的热液蚀变作用密切相关。矿体分布明显受火山岩岩性、岩相、层位及构造控制，成因上与火山喷发和爆发作用有关。矿床受后期火山热液、次生富集改造后富化明显。     

会昌县淘锡坝锡矿地质特征、成因初探及找矿意义

淘锡坝锡矿发育有云英岩型，破碎带蚀变岩型、（次火山）隐爆层间裂隙带型等锡矿化，（次火山）隐爆层间裂隙带型锡矿化是矿区主要矿化类型，矿化产于密坑山侵入杂岩体、北西部分鸡笼嶂组流纹质晶屑凝灰熔岩外接触带微细裂隙带中，矿体呈缓倾斜似层状、脉状，控矿因素主要有地层、岩浆岩、构造。矿化对火山岩岩性有一定的选择性，矿矿物质主要来源于岩浆岩，（次火山）隐爆层间裂隙带构造是矿床重要的赋矿构造，矿床成因类型为与火山活动期后次火山（隐爆）活动有关的岩浆期后高-中温热液交代-充填型矿床；同时，矿床兼具广义的斑岩型锡矿的特征，该矿化类型的初步探明，进一步拓展了赣南中生代火山岩区的找矿空间。     

新疆也列莫顿地区小赞浅成低温热型金矿床地质地球化学

小于赞金矿赋存于下石炭统大哈拉军山组陆相火山岩中,矿体受火山－次火山岩体与ＮＷ向断裂构造的联合控制,呈脉状产出。元素地球化学异常为Ａｕ－Ａｇ－Ｈｇ－Ａｓ－Ｂｉ组合。该矿床属浅成低温热液型金矿床。     

新疆也列莫顿地区小于赞浅成低温热液型金矿床地质地球化学

小于赞金矿赋存于下石炭统大哈拉军山组陆相火山岩中,矿体受火山－次火山岩体与ＮＷ向断裂构造的联合控制,呈脉状产出。元素地球化学异常为Ａｕ－Ａｇ－Ｈｇ－Ａｓ－Ｂｉ组合。该矿床属浅成低温热液型金矿床。     

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.)