全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
矿床地质  2011 

西藏尤卡朗铅银矿床成矿作用初步研究

Keywords: 地质学,成矿作用,流体包裹体,稳定同位素,铅银矿,尤卡朗,西藏

Full-Text   Cite this paper   Add to My Lib

Abstract:

西藏尤卡朗铅银矿床产于中侏罗统拉贡塘组受岩浆热变质的砂泥质岩中,与矿区北部出露的燕山期至喜马拉雅期中酸性侵入岩体有关。矿体的产出和分布受到北北东向断裂构造的控制,尤其是多期活动的节理造成局部矿化富集。成矿作用可划分为5个阶段,包括石英菱铁矿阶段、铅锌(银)矿化阶段、细粒铅银矿化阶段、黄铁矿化阶段和石英脉阶段。矿石中硫化物δ34S值为-3.62‰~-9.47‰。闪锌矿和方铅矿平衡硫同位素温度值为214℃。单矿物的铅同位素206Pb/204Pb分布于18.683~18.923之间,207Pb/204Pb分布于15.684~15.800之间,208Pb/204Pb为39.090~39.581,μ值在9.60和9.82之间,Th/U比值在3.88和4.05之间,在构造环境图解中位于上地壳附近,可能与俯冲带中海底沉积物随洋壳板片俯冲进入地幔的重熔岩浆作用有关。流体包裹体研究表明,成矿温度为中温,流体盐度不高且有降低的趋势,成矿热液主要来源于岩浆期后热液,推测地下水混入成矿热液导致铅银矿的形成。

References

[1]  佐岐秋良;石原舜三,马大铨译 日本磁铁矿系列和钛铁矿系列花岗岩类岩石的硫同位素成分,1979.
[2]  朱炳泉,地球科学中同位素体系理论与应用——兼论中国大陆壳幔演化,北京:科学出版社,1998.
[3]  杨德明;和仲华,西藏1∶25万门巴区幅区调(H46C002002),吉林大学地调院,2005.
[4]  魏菊英,同位素地球化学,北京:地质出版社,1988.
[5]  Yang D M;He Z H,Republic of China 1∶ 250 000 Regional geological survey of the Mamba district sheet in Tibet (H46C002002),Geological Survey of Jilin University,2005.
[6]  Wei J Y,Isotope Geochemistry,北京:地质出版社,1988.
[7]  Sasaki A;Ishihara S;Ma D Q,Sulfur isotopic composition of the magnetite-series and ilmenite-series granitoids in Japan,Yichang Institute of Geology and Mineral Resources,Granite Genesis,1979.
[8]  R E Zartman;B R Doe,Plumbotectonics-the model,Tectonophysics,1981.
[9]  Brown P E;Lamb W M,P-V-T properties of fluids in the system H2O-CO2-NaCl:New graphical presentations and implications for fluid inclusion studies,Geochimica et Cosmochimica Acta,1989.
[10]  Lu Y F.GeoKit:A Geochemical toolkit for Microsoft Excel[J].Geochimica,2004(05)
[11]  Huang M;Lai J Q;FanJ C;Hu R G,Wang T,Wen L C and Wang Z D,Geological characteristics and prospecting potential in the Youqialang Pb-Ag deposit,Naqu County in Tibet,Beijing:Geol Pub House,2008.
[12]  Fu S Y;Jin Y H;Zhang S;Wang F Q.Geological characteristics of the Youqialang Pb-Ag deposit with its genesis research,Naqu County in Tibet[J].Mineral Resources and Geology,2008(5)
[13]  路远发.GeoKit:一个用VBA构建的地球化学工具软件包[J].地球化学,2004(05)
[14]  黄敏;赖健清;樊俊昌;胡荣国,王涛,文力才,王振东,西藏那曲尤卡朗铅银矿床特征及其找矿前景,北京:地质出版社,2008.
[15]  付少英;靳拥护;张哨波;王福全.西藏那曲县尤卡朗铅银矿床地质特征及成因分析[J].矿产与地质,2008(05)
[16]  Zhu B Q,Theory and application of the isotopic systematics in the earth sciences:Discussion on the crust-mantle evolution for China Continent,北京:科学出版社,1998.
[17]  Brown P E,FLINCOR:A microcomputer program for the reduction and investigation of fluid inclusion data,American Mineralogist,1989.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133