新疆阿尔恰勒铅锌矿成矿模式①

阿尔恰勒铅锌矿产于下石炭统阿克沙克组灰岩中,铅锌矿体呈层状富厚矿体产出。铅同位素组成表明该矿床的铅可能主要来源于造山带,硫同位素组成显示硫来源于地幔或地壳深部,氢氧同位素反映出成矿流体具有大气降水加入的特征,包裹体特征为中温成矿和低盐度流体。该矿床属于层控矿床,为喷流沉积改造富集形成的矿床,并建立了成矿模式。     

北祁连山西段剪切带型金矿床成矿流体特征

北祁连山西段金矿床以剪切带型为主,控矿的主导因素是剪切构造和成矿流体。对寒山、鹰嘴册和珠龙等代表性矿床的流体包裹体的研究表明,产于剪切带中金矿床的成矿流体具有中低温、低密度和低盐度等特点,包裹体中气候和液体ＣＯ２／Ｈ２Ｏ比值较高。稳定同位素研究结果表明,不同矿床的成矿流体来源不尽相同,鹰嘴山浚矿床和寒山矿床成矿流体来源以深部流体为主,珠龙矿床的成矿流体主要为大气降水。     

湖南城步县金水铜矿地质特征及成因探讨

金水铜矿床受构造控制,热液成矿标志明显。依据成矿地质背景及矿床地质特征、硫同位素和流体包裹体特征等研究认为,成矿物质来源深部,成矿作用具多阶段,成矿流体具热卤水性质;矿床初步确定为岩浆期后热液脉型铜矿床。     

哀牢山金矿带冬瓜林金矿床流体包裹体及硫同位素研究

流体包裹体和硫同位素研究可以揭示成矿流体特征和成矿物质来源,是探讨矿床成因的重要手段。冬瓜林金矿床位于哀牢山金矿带的镇沅金矿田,研究程度较低,矿床成因研究尚未系统开展。本文针对该矿床利用显微测温和硫同位素示踪,分别对两个金成矿阶段脉体中的流体包裹体和矿石中黄铁矿的硫同位素进行了测定,进而探讨其矿床成因。流体包裹体测试结果显示,流体体系为NaCl-H_2O体系;包裹体的均一温度主要分布于100~400℃(有160~190℃和280~310℃两个峰值),盐度集中于6%~9%,密度集中于0.7~0.8 g/cm3和0.9~1.0 g/cm~3,表明成矿流体为中低温度和低盐度的流体。硫同位素测试结果显示,两个金成矿阶段的δ~(34)S值分别集中于0~1‰和-4.7‰~3‰,整体上与该矿床最主要的矿石——煌斑岩型矿石的δ~(34)S值最为接近,且矿床中煌斑岩和金矿化关系最为密切,因此成矿物质可能主要来自与煌斑岩有关的幔源物质,但受到地壳物质的混染。综合上述结果认为,冬瓜林金矿床的形成可能与幔源含金流体有关,但有大气降水和围岩的加入,这一结论为揭示本矿床及哀牢山金矿带的矿床成因研究提供了重要依据。     

小宛南山金矿地质特征及成因

小宛南山金矿是产于太古宙花岗岩-绿岩地体,受敦煌群D岩组上部层位和韧性剪切带控制的变质热液型金矿床.矿源岩为绿岩带的镁铁质火山岩,成矿流体主要为变质热液,主成矿期属中元古宙.基于金矿床区域地质背景、矿床地质特征、微量元素特征、硫铅同位素组成和包裹体特征,以金赋存层位、容矿岩石、韧性剪切构造、蚀变作用为基础,通过分析成矿地质条件,证明金矿床应属变质热液成因.     

论地幔流体参与大水金矿成矿的可能性

通过对大水金矿时空分布及元素地球化学特征的分析研究,探讨了地幔流体参与大水金矿床成矿的可能性。大水金矿属于川甘陕＂金三角＂矿集区的一个组成部分,在时空分布上受深大断裂、壳幔混合源岩浆岩的控制,是西秦岭地区勘查发现的大型金矿床之一。研究表明,矿石及贯穿于整个成矿过程中的方解石脉的稀土配分模式总体具相对富集轻稀土的特征。流体包裹体显微测温显示矿床的成矿温度范围为105℃-400℃。包裹体（方解石）气相成分主要为CO2和H2O,液相成分中阳离子以K^＋为主,Na^＋次之;阴离子以SO4^2-为主,Cl^-次之。矿物黄铁矿的δ^34S为-1.8‰-＋4.1‰,平均值＋2.4‰,反映成矿流体中硫部分来源于地幔。热液方解石的碳、氢、氧同位素组成反映成矿流体既有来自地幔的流体,也有来自岩浆岩、地层的流体,还有明显大气降水的加入。硅化灰岩矿石及硅质岩矿石的硅同位素组成具深部或岩浆热液和热水来源的特点,其氧同位素组成具火成石英来源的特点。矿石铅与矿区岩石铅（灰岩和脉岩）的铅同位素组成比较相近,在铅同位素构造模式图及Δγ-Δβ成因分类图解中,铅属壳幔混合铅。综上可知,矿床在成矿作用过程中存在地幔流体活动。     

东天山马庄山金矿床流体包裹体和同位素地球化学研究及其对矿床成因的制约

在详细的矿床地质研究基础上，对马庄山金矿床流体包裹体和氢、氧、硫、铅同位素组成进行了研究。成矿流体具有中温、中低盐度、富H2O、CO2和富Na^ 、K^ 、Cl^-离子等特征。氢、氧、硫同位素组成表明，成矿流体存在着两个主要来源：岩浆流体和大气降水来源的加热地下水。铅同位素组成分布区间较为宽广且构成良好的线性相关（R^≥0.98），反映金属物质的多源性以及地壳和地幔各个储库的混合趋势。显微温度计及气体组分间的协变关系的不一致性，排除了去气作用存在的可能性。流体包裹体和同位素综合研究表明，两种来源流体发生了混合作用，从而导致了矿石矿物和金的沉淀。     

江西省村前铜多金属矿床成矿流体性质与物质来源:流体包裹体及硫铅同位素证据

为揭示村前铜多金属矿床成矿流体性质与物质来源,为矿床成因的深入研究提供依据,对铁铜硫化物石英脉中的流体包裹体和金属硫化物进行硫、铅同位素分析测试。结果显示,铁铜硫化物石英脉中存在纯液相、气液两相、气液固三相和纯(极富)气相4种类型流体包裹体。流体包裹体均一温度范围为256~417℃,流体盐度则分为明显的两个族群,一为低盐度(7.15%~13.88%NaCl_(eqv))的气液两相包裹体,另一为高盐度(31.93%~43.79%NaCl_(eqv))的气液固三相包裹体,且二者在空间上具有共存关系,代表了流体的沸腾作用,成矿流体属中高温、高盐度岩浆热液流体。硫、铅同位素研究表明,矿石硫同位素组成为接近1的正值,属深源硫;铅同位素指示矿石中铅主要为上部地壳来源,有少量幔源铅或壳幔混源的造山带铅,表明上部地壳对矿质来源具有重要的贡献作用。     

辽东庄河金矿同位素地球化学特征及成矿时代

到目前为止,对辽宁庄河金矿尚没有做过系统的矿床地球化学和同位素年代学的研究。本文在成矿地质条件分析的基础上,对庄河金矿床的氢、氧同位素、硫同位素、铅同位素、碳同位素以及Rb-Sr同位素的组成特征进行了分析研究。氢、氧同位素组成表明成矿流体主要来源于岩浆热液,并与围岩发生了同位素交换;硫同位素和碳同位素组成表明成矿物质主要来源于地壳深部;矿石和花岗斑岩脉具有非常相似的铅同位素组成,暗示该矿床的形成和物质来源与此岩浆活动有密切的成因联系;石英流体包裹体Rb-Sr等时线年龄为143.0±5.8Ma,表明金的成矿期为燕山期。     

吉林省龙井市后底洞金矿床的成因探讨

后底洞金矿床是吉林省延边优地槽区一个与基性岩有关的典型矿床,通过研究其地质特征及矿床矿石的硫,氢氧同位素组成等,认为该矿床的物质来源及成矿热液来源是深部基性岩浆,矿床属中温岩浆热液型金矿床。     

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.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)