Physicochemical Conditions of the Formation of Beryl and Aquamarin in Mufushan Granopegmatite Deposit,Hunan Province,China

The formation of the Mufushan granopegmatite was closely related to the Late Yenshanian multiphase and multistage magmatic activities,More than one generation of beryl and aquamarine occur in different types of pegmatite in the granites.The presence of melt and melt-fluid inclusions strongly indicates a melt-solution character of the pegmatitic magma.Forming temperatures of the different generations of beryl in a Na^ -K^ ,Ca^2 -CO3^2--Cl^--SO4^2- solution ranges from 990℃to 200℃.Aquamarine was formed at 720-180℃.The contents of alkali metals(Na^ K^ )in th ore-formming solution of aquamarine are lower than those in the beryl,but the contents of alkali earths(Ca) and salinity are higher,The granite was generated by remelting of the basement formation(meta-sedimentary rocks of the Lengjiaxi Group)which also served as the source of ore-forming material.Beryllium in the pegmatite was transported mainly in the form of Na[Be(CO3)2],with part of it being complexed with Cl^- and SO4^2-.During the generation and evolution of the pegmatite,equilibrium might have been reached in the solid-melt-fluid or solid-fluid system.The intergranular solutions may have reacted with the early crystallized minerals,resulting in potash-feldsparization,albitization and muscovitization during which the ore-forming elements were mobilized and transported in favour of ore deposition.     

粒间溶液形成条件的实验研究

粒间溶液形成条件的实验研究李兆麟，雷丽红，郭洪中，蒋浩深，赵梅芳（中山大学地质系，广州５１０２７５）（南京大学地球科学系，南京２１００００８）关键词粒间溶液，实验地球化学关于粒间溶液成矿的问题，作者在１９８６年进行过论述，１９８９～１９９２年进行了深...     

粒间溶液与成矿作用

本文通过对20多个矿床的野外地质特征及室内矿物中的包裹体、高温-高压成岩、成矿实验和元素地球化学研究,论述了花岗岩浆性质属熔体-溶液,并分析了岩浆冷凝过程中的局部岩浆分异作用形成粒间溶液的机制,进一步提出与花岗岩有关的矿床成矿溶液主要来源于粒间溶液。这一论点不但可以解释与花岗岩有关的成矿溶液来源问题,而且可以合理解释花岗岩体内自变质蚀变交代作用及其与成矿的关系,此外对研究矿床成因均有重要意义。     

实验地球化学展望

近年来,我国实验地球化学在当前地质事业不景气的情况下,每年国家自然科学基金都注意到支持和扶植这一领域的研究项目,并取得不少成绩。此外,已创立的实验基地及各实验地球化学实验室为科研生产服务,发挥了积极作用。在新的形势下,实验地球化学往何处去?如何走出一条适合于当今科学及经济发展的道路?现提出一点肤浅见解供大家参考。 1.实验地球化学发展应加强矿物中包裹体研究与成岩成矿实验相结合。我们认为实验地球化学是利用专门实验手段测定天然地球化学作用的各种物理化学参数及模拟空间化学、地球化学的学科。涂光炽在《实验地球化学》(1988)一书序言中指出:实验地球化学涉及面较宽,凡在室内对岩石圈、大气圈、外来天体和天体本身的各式各样化学组成、化学作用和化学演化进行基础实验、应用实验和模拟实验热力学和动力学以及气液与熔融包裹体研究,均可包括在内。矿物中包裹体研究可以获得比较客观的天然地球化学作用的各种物理化学参数,     

Characteristics of melt inclusions in skarn minerals from Fe,Cu(Au) and Au(Cu) ore deposits in the region from Daye to Jiujiang

The skarns and skarn deposits are widely distributed at home and abroad. The skarn deposits include many kinds of ores and higher ore grade. Some of them are broad in scale. Scientists of ore deposits from different countries have paid and are paying grea…     

粤西河台金矿锆石SHRIMP年龄及其地质意义

河台金矿是一个受剪切带控制的金矿床,成矿作用分为韧性剪切变质成矿期的韧性剪切变质成矿作用阶段和热液蚀变成矿期的金硅化石英脉阶段、金硫化物阶段以及方铅矿闪锌矿碳酸盐脉阶段,金的成矿主要发生在热液蚀变成矿期的金石英脉阶段和金硫化物阶段。SHRIMP锆石U-Pb测年显示赋矿围岩混合岩中继承性锆石的核部和幔部年龄为343.9~1732Ma,代表形成混合岩原岩的源区岩石的年龄;继承性锆石边部和混合岩化变质作用中新生锆石的年龄平均值为239.6±3.9Ma,属印支期,为混合岩化变质作用的年龄,这一年龄与印支期印支板块与扬子板块、扬子板块与华北板块的碰撞时代相一致,证实在中国华南存在印支期的混合岩化变质作用。韧性剪切变质成矿作用的年龄小于混合岩化变质作用的年龄(239.6±3.9Ma);富硫化物含金石英脉中热液锆石普通铅含量高,为0.65%~2.27%,Th/U值变化围很小,为0.306~0.557,其年龄为152.5±3.1Ma,属燕山期,代表河台金矿主成矿期年龄。     

编后语

流体包裹体研究已有一百多年历史,在上个世纪60年代发展成一门独立的科学分支。1968年在国际地质学会会议上成立了"国际流体包裹体委员会(COFFI)"。与此同时,世界各国学者相继在欧美分别建市了欧洲流体包裹体协会和美洲流体包裹体协会,并每两年定期召开 ECROFI(European Current Research On Fluid Inclusion)和PACROFI(Pan American Current Research On Fluid Inclusion)。此外,国际矿物学会设立了流体包裹体专业委员会(WGIM,IMA)。     

前言：首届亚洲流体包裹体研究国际会议

ACROFI,abbreviation of the Asian Current Research on Fluid Inclusions,is a parallel of ECROFI and PACROFI.The first conference of ACROFI(ACROFI-I)was held at Nanjing University,China on 26～28 May 2006.ACROFI was designed as a biennial conference and aimed at providing an international forum for the exchange of latest researches and new ideas of geoscientists from academy,government and industry from Asian countries and other nations focusing on studies of both fluid and silicate inclusions.