【作者】 彭根永； 鲍佩声； 王希斌； 金远新； 郝梓国；

【Author】 Peng Genyong Bao Peisheng Wang Xibin Jin Yuanxin(Institute of Geology,CAGS) Hao Ziguo (Chinese Academy Geological Sciences)

【机构】 中国地质科学院地质研究所； 中国地质科学院；

【摘要】 新疆洪古勒楞蛇绿岩中存在两种不同类型的铬铁矿：一种产于变质橄榄岩的纯橄岩-斜辉辉撖岩杂岩中；另一种产于堆积岩底部的纯橄岩、含长纯橄岩及长橄岩中。两者的产状、结构构造及地球化学特征均存在较明显的差异,系两种不同的成因类型。堆积岩中的铬铁矿为岩浆房中早期结晶的产物,而变质橄榄岩中的铬铁矿则是原始地幔的熔融残余。更多还原

【Abstract】 There are two types of chromite deposit in Hongguleleng ophiolite. One is located in the meta-peridotite,the other is at the bottom of the cumulates.The two types of chromite deposit have sharp differences in the field occurrence,texture,structure and geochemistry,which reflects that their genetic mechanisms are different.The ore-forming spinel in the meta- morphic peridotite is richer in Cr₂O₃ and poorer in Al₂O₃,TiO₂ than that in the cumulates.The paper hence holds tile opinion that the chromite deposit in the cumulates is the product of the early crystallization in magma chamber and the one in the metamorphic peridotite is the product of highly meltingresidue of the primary mantle.更多还原