中国地质Issue(5)：1483-1492,10.
西藏泽当地幔橄榄岩中的异常矿物及其指示意义
Implications of unusual minerals in Zedang mantle peridotite, Tibet
摘要
Abstract
The mineral assemblage of such minerals as diamond and moissanite has been discovered in several mantle peridotites in Yarlung Zangbo ophiolite belt. The authors collected 526 kg harzburgite rocks from Zedang mantle peridotite for artificial heavy mineral research so as to further investigate the physical and chemical environment of these unusual minerals. Diamond, moissanite and more than 30 other mineral species were discovered, similar to the result of other mantle peridotite in the Yarlung Zangbo ophiolite belt. These unusual minerals show that high pressure, super-reduction conditions and numerous continental crust materials <br> existed in mantle peridotite, suggesting that ancient crust might have experienced continental deep subduction or lithosphere delamination into mantle or even into mantle transition zone (410-660 km) at the early stage;subsequenty these crustal materials were modified in an environment of high pressure and super-reduction in the deep mantle, and surged upward to shallow crust by mantle plume or mantle convection process. Unusual minerals were trapped within the mantle peridotite in such a recycling process. It is of great significance to understend crust mantle exchange and deep mantle dynamics for comprehensive research on mineralogy of unusual mineral assemblages in mantle peridotite.关键词
地幔橄榄岩/泽当/金刚石/蛇绿岩/西藏Key words
mantle peridotite/Zedang/diamond/ophiolite/Tibet分类
天文与地球科学引用本文复制引用
郭国林,杨经绥,刘晓东,徐向珍,张仲明,田亚洲,熊发挥,武勇..西藏泽当地幔橄榄岩中的异常矿物及其指示意义[J].中国地质,2015,(5):1483-1492,10.基金项目
国家自然科学基金(40930313,41262002)、国家行业专项(SinoProbe-05-02)、中国地质调查局工作项目(12120115027201,1212011121263)及中国地质科学院地质研究所基本科研业务费项目（J1526）联合资助。 （40930313,41262002）
