摘要
锂同位素在地质学、地球化学研究中有着广阔的应用前景。简单介绍了锂同位素研究已取得的进展,并在四川甲基卡伟晶岩型锂多金属矿床研究中开展应用。研究表明,四川甲基卡锂矿床中2件锂辉石的锂含量非常高,分别为33 592×10-6和34 264×10-6,相应的δ7Li值分别为-0.6‰和-0.4‰,平均值为-0.5‰,而二云母花岗岩中黑云母的锂含量为7 350×10-6,δ7Li值为+0.6‰,两者在误差范围内具有非常好的一致性,证明锂辉石来源于二云母花岗岩,这与其他包裹体、同位素地球化学和年代学证据等相一致。
As a useful geochemical tracer,lithium isotope system has been used to study some important geological or geochemical issues.This paper summarizes the recent advances in research on lithium isotopes and its application to Jiajika pegmatite type lithium polymetallic deposit in Sichuan.The Jiajika deposit is the largest pegmatite type Li polymetallic deposit in China.Samples from Jiajika deposit were analysed by MC-ICP-MS in the University of Maryland.Two samples of spodumene contain 33592×10-6 and 34264×10-6 Li and have δ7 Li values of-0.6 ‰ and-0.4‰.One sample of biotite in two mica granite contains 7350×10-6 Li and has δ7Li value of ＋0.6‰.They are consistent in the uncertainty range.Therefore,following interpretations of published data of C,H and O isotopes,fluid inclusions and chronology,we consider that spodumenes in the lithium polymetallic deposit may have originated from the granite,suggesting that ore forming fluids were also derived from the granite.
出处
《现代地质》
CAS
CSCD
北大核心
2011年第2期236-242,共7页
Geoscience
基金
国家自然科学面上基金项目(40973013)
国土资源部公益性行业科研专项(201011027)
中国地质调查局国土资源大调查项目(1212011120298
12120108160)
中央级公益性科研院所基本科研业务费专项资金项目(K0802)
中国地质科学院实验室基金项目(2009-SYS-06)
关键词
地球化学
锂同位素
伟晶岩
锂多金属矿床
四川甲基卡
geochemistry
lithium isotope
pegmatite
lithium polymetallic deposit
Jiajika in Sichuan
