西藏罗布莎蛇绿岩中透镜网络系统的特征及成因

详细信息

FEATURES AND GENESIS OF LENS-NETWORK SYSTEMS IN THE LUOBUSHA OPHIOLITE,TIBET

摘要: 通过对罗布莎蛇绿岩进行详细的构造解析，厘定了造山带蛇绿岩中多种类型、尺度的透镜网络系统，并认为它们是在裂陷海盆向造山带离合转换和镁铁质、超镁铁质岩从上地幔向上地壳固态位移过程中，由部分熔融产生的物性不均一的变质橄榄岩，在中、下地壳塑性挤压状态下发生变形分解的产物。

Abstract: Multi-type and multi-scale lens-network systems in orogen ophioltes have been de-termined by means of detalied structural analysis of the Luobusha ophiolite in Tibet.The au-thor holds that they are the product of deformation and decomposition of inhomogeneousmetamorphosed peridotite produced by partial melting of the mantle in the compres- sionalplastic state of the middle and lower crust during the process of" opening- and- closing" transformation from a taphrogenic sea to orogenic belt and solid emplacment of mafic and ul-tramafic rocks from the upper mantle to upper crust.