Lithium Isotope and Its Application to Jiajika Pegmatite Type Lithium  Polymetallic Deposit in Sichuan

Abstract

Abstract:

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.

Key words: geochemistry, lithium isotope, pegmatite, lithium polymetallic deposit, Jiajika in Sichuan

CLC Number:

SU Yuan-Na,TIAN Shi-Hong,HOU Zeng-Qian,LI Jian-Kang,LI Zhen-Zhen. Lithium Isotope and Its Application to Jiajika Pegmatite Type Lithium Polymetallic Deposit in Sichuan[J]. Geoscience, 2011, 25(2): 236-242.

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Lithium Isotope and Its Application to Jiajika Pegmatite Type Lithium Polymetallic Deposit in Sichuan

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