赣东北蛇纹岩中铬尖晶石特征及其形成环境

CHARACTERISTICS AND FORMATION ENVIRONMENT OF Cr-SPINEL IN SERPENTINITE IN THE NORTHEAST OF JIANGXI PROVINCE

赣东北蛇纹岩主要分布于该区的蛇绿混杂岩带内，经ICPMS分析发现该区蛇纹岩Cr的丰度达6187×10^-6，电子探针分析发现主要以铬尖晶石类矿物形式存在。铬尖晶石矿物的Cr^#[=100＊Cr／（Cr＋Al）]为60～69，指示其形成环境可能与SSZ型蛇绿岩（supra—subduction zone ophiolite）有关。

Serpentinite in the northeastern Jiangxi Province is mainly distributed in the ophiolitic melange zone. Results from ICP - MS and EPMA analysis show that serpentinite is dominated by Cr - spinel group minerals with an abundance of Cr up to 6187×10^-6 and Cr^#（ = 100 ＊ Cr/（ Cr ＋ Al） ） ranging between 60 and 69, indicating that the formation environment may have relations with supra - subduction zone ophiolite.