论文部分内容阅读
萨尔托海蛇绿岩是西准噶尔达拉布特蛇绿岩带重要组成部分。萨尔托海蛇绿岩以变质橄榄岩为主,少量堆集岩和上层辉长岩,大量熔岩即细碧岩和角斑岩。岩脉为钠长斑岩和辉绿岩。亏损的变质橄榄岩稀土总丰值1.45ppm,总量低两个数量级。堆集岩和熔岩稀土丰度显示,不可能来源于亏损的变质橄榄岩。细碧岩和角斑岩熔度为2.5至5%,而上层辉长岩为12—15%,由两次熔融事件产生。萨尔托海蛇绿岩由稀土和微量元素图解表明属岛弧型蛇绿岩,与地质背景一致。
The Salto Sea ophiolite is an important part of the Dalbot ophiolite belt in the West Junggar. Salto Sea ophiolite is dominated by metamorphic peridotite, a small amount of plutons and upper gabbro, a large number of lava that is small bilite and angular porphyry. Dike diorite porphyrite and diabase. Loss of peridotite rare earth total abundance 1.45ppm, two orders of magnitude lower. The abundance of rare earths in lava and lava shows that it is impossible to come from depleted metamorphic peridotites. The feldspars and angular porphyries have a melting rate of 2.5 to 5%, while the upper gabbro is 12-15%, resulting from two melting events. The Salto Sea ophiolite is illustrated by the REE and trace elements as an island arc-shaped ophiolite, consistent with the geological background.