【引用本文】 朱鑫祥, 刘琰, . 四川雪宝顶W-Sn-Be矿床中矿物化学组成及矿床成因[J]. 岩矿测试, 2021, 40(2): 296-305. doi: 10.15898/j.cnki.11-2131/td.202101100006
ZHU Xin-xiang , LIU Yan . Chemical Composition of Materials in Xuebaoding W-Sn-Be Deposit, Sichuan Province: Constraints on Ore Genesis[J]. Rock and Mineral Analysis, 2021, 40(2): 296-305. doi: 10.15898/j.cnki.11-2131/td.202101100006

四川雪宝顶W-Sn-Be矿床中矿物化学组成及矿床成因

1. 中国地质科学院地质研究所, 北京 100037;

2. 中国地质大学(北京), 北京 100083

收稿日期: 2021-01-10  修回日期: 2021-03-07 

基金项目: 国家自然科学基金项目(41922014,41772044);自然资源部地质调查局地质调查项目(DD20190060,DD20190629)

作者简介: 朱鑫祥,硕士,矿物学、岩石学、矿床学专业,主要从事稀有金属矿床研究。E-mail:2120180006@cugb.edu.cn。

Chemical Composition of Materials in Xuebaoding W-Sn-Be Deposit, Sichuan Province: Constraints on Ore Genesis

1. Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China;

2. China University of Geosciences (Beijing), Beijing 100083, China

Received Date: 2021-01-10
Revised Date: 2021-03-07

摘要:雪宝顶矿床位于四川省的松潘甘孜造山带中,以出产大颗粒含W-Sn-Be-F-P的矿物而闻名,前人对该矿床已经开展了大量的研究,但缺乏对粗粒矿物的主次痕量元素研究。本次研究采用X射线荧光光谱(XRF)、电子探针(EMPA)和电感耦合等离子体质谱(ICP-MS)技术对矿床中的各矿物的主次痕量元素进行测试分析。结果显示,雪宝顶矿床中的绿柱石、白钨矿、锡石、白云母、萤石、磷灰石、电气石,除富含W、Sn、Be、Na、K、Ca等主要成矿元素外,还富集Li、Rb、Cs等碱金属元素和F、B、P等挥发份。其中,雪宝顶绿柱石中富含Li(3484~4243μg/g)、Rb(39.3~71.1μg/g)、Cs(2955~3526μg/g);白云母中Li、Rb和Cs元素含量分别高达4243μg/g、72.3μg/g和3526μg/g;磷灰石中除主量元素P外,F(4.48%~5.21%)含量相对较高;电气石中的B含量高达30990~32880μg/g。雪宝顶矿床中的花岗岩岩体W、Sn、Be、Li、Rb、Cs、F、B、P等元素相对富集,但CaO(0.46%~0.82%)含量相对较低。其中Li、F、B、P等元素对成矿元素在成矿流体内的富集起到了极大的促进作用。矿区内大理岩是一种富Ca的方解石大理岩,为成矿提供了大量的Ca元素,有利于粗粒矿物的大规模沉淀。因此,粗粒矿物中的W、Sn、Be、Li、Rb、Cs、F、B、P等元素主要来源于原始岩浆流体,大理岩地层为粗粒矿物提供了大量的Ca元素。

关键词: 雪宝顶, W-Sn-Be矿床, X射线荧光光谱法, 电感耦合等离子质谱法, 电子探针, 化学组成, 矿床成因

Chemical Composition of Materials in Xuebaoding W-Sn-Be Deposit, Sichuan Province: Constraints on Ore Genesis

KEY WORDS: Xuebaoding, W-Sn-Be deposit, X-ray fluorescence spectrometry, inductively coupled plasma-mass spectrometry, electron probe, chemical composition, ore genesis

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四川雪宝顶W-Sn-Be矿床中矿物化学组成及矿床成因

朱鑫祥, 刘琰