【摘要】 通过对采自金川镍矿 I矿区露天矿的第二期侵入岩体中。样品的稀土元素、微量元素进行全岩等离子质谱 (ICP- MS)测定发现第二期侵入的岩体具有明显的轻稀土元素富集和无明显铕异常的特征 ,是上地幔低比例平衡部分熔融和分离结晶共同作用的产物。岩体中镍黄铁矿、磁黄铁矿、黄铁矿成条带状出现 ,表明其形成时低氧逸度的成岩环境。更多还原

【Abstract】 The samples used in this article are the second episode intrusive rocks in Jinchuan nickel deposit area.The contents of REE and trace elements in the samples measured by ICP MS showed that the REE abundance distribution pattern was characterized by high REE content ( 16.878 5 ×10 -6 ~53.590 1×10 -6 ), the enrichment of LREE (LREE/HREE=4.195 8~7.249 4) and no apperant Eu anomaly (δEu=0.822 3~1.546 5). It was considered to be resulted from the low partial melting of the upper mantle and separated crystallization. The REE pattern of the rocks and the appearance of nickel pyrites, pyrite and pyrrhotite in the samples indicated that the rocks were in low oxygen fugacity during the formation of the Jinchuan nickel deposit.更多还原