钛矿和石榴石U-Pb定年及微量元素对夕卡岩型钨矿床年龄和成矿条件的指示——以皖南逍遥钨多金属矿床为例

IF 1.7 3区地球科学 Q2 GEOLOGY

岩石学报 Pub Date : 2023-01-01 DOI:10.18654/1000-0569/2023.10.13

SHI Ke, XIAO Xin, YANG XiaoYong, ZHANG DaYu, CAI Yang, WENG WangFei, WANG JinQuan

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引用次数: 0

摘要

逍遥矿床是安徽南部新发现的大型钨多金属矿床,其精细的岩浆-热液时限及成矿作用仍不明确。本文对其开展了石榴子石和榍石的U-Pb年代学和微量元素分析,发现逍遥矿床发育多阶段榍石(岩浆榍石和热液榍石),岩浆榍石与石英、磁铁矿、长石共生,而热液榍石与石英、方解石、辉钼矿、黄铜矿关系密切。逍遥矿床中石榴子石和榍石中均具有一定的U含量,其中石榴子石中U含量较低(平均为15.9×10-6),岩浆榍石和热液榍石的U含量较高(平均值大于100×10-6)。石榴子石和榍石U-Pb同位素定年结果显示成岩和W多金属矿化均形成于150Ma左右,指示W多金属矿化与花岗闪长岩密切相关。岩浆榍石、钾长石、石英、磁铁矿矿物组合指示逍遥成矿岩浆具有氧化性强和富水的特征。逍遥钨矿中的石榴子石以钙铁榴石为主且富集W、Sn特征,指示早期流体为氧化性流体。此外,热液榍石中HFSE元素的高度富集表明其成矿流体为富碱、富F的热液系统,为钨、铅、锌、铜、银、钼多金属的富集提供了有利热液条件。综上所述,石榴子石和榍石能够有效指示矽卡岩W矿的成矿时代和成岩成矿条件。

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U-Pb dating and trace element of titanite and garnet as indicators of the age and ore-forming condition of skarn W deposit: A case study of the Xiaoyao W polymetallic deposit in southern Anhui, China

逍遥矿床是安徽南部新发现的大型钨多金属矿床,其精细的岩浆-热液时限及成矿作用仍不明确。本文对其开展了石榴子石和榍石的U-Pb年代学和微量元素分析,发现逍遥矿床发育多阶段榍石(岩浆榍石和热液榍石),岩浆榍石与石英、磁铁矿、长石共生,而热液榍石与石英、方解石、辉钼矿、黄铜矿关系密切。逍遥矿床中石榴子石和榍石中均具有一定的U含量,其中石榴子石中U含量较低(平均为15.9×10^-6),岩浆榍石和热液榍石的U含量较高(平均值大于100×10^-6)。石榴子石和榍石U-Pb同位素定年结果显示成岩和W多金属矿化均形成于150Ma左右,指示W多金属矿化与花岗闪长岩密切相关。岩浆榍石、钾长石、石英、磁铁矿矿物组合指示逍遥成矿岩浆具有氧化性强和富水的特征。逍遥钨矿中的石榴子石以钙铁榴石为主且富集W、Sn特征,指示早期流体为氧化性流体。此外,热液榍石中HFSE元素的高度富集表明其成矿流体为富碱、富F的热液系统,为钨、铅、锌、铜、银、钼多金属的富集提供了有利热液条件。综上所述,石榴子石和榍石能够有效指示矽卡岩W矿的成矿时代和成岩成矿条件。

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来源期刊

岩石学报 Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

3.60

自引率

22.20%

发文量

5997

审稿时长

6 months

期刊介绍： Acta Petrologica Sinica is an academic journal under the supervision of the Chinese Academy of Sciences and sponsored by the Chinese Society of Mineralogy, Petrology and Geochemistry and the Institute of Geology and Geophysics of the Chinese Academy of Sciences. The journal's publishing policy is to adhere to innovation, comprehensiveness, cutting-edge and orientation, advocate diversity and multi-school, rely on and unite the vast number of geoscientists across the country, explore the mysteries of nature, carry out extensive and in-depth basic theoretical research, promote the research and development of the field of earth science in my country, publish high-level scientific research results, and cultivate and train a large number of geoscientific research talents for my country. Acta Petrologica Sinica mainly reports on various disciplines related to the basic theory of petrology, including important basic theories and applied research results in magmatic petrology, metamorphic petrology, sedimentary petrology, petrology geotectonics, rock isotope chronology and isotope geochemistry, rock mineralization, and rock-forming mineralogy. At the same time, the journal also publishes review articles, problem discussions, academic trends and book reviews.