秦岭佛坪穹隆盖层岩系的地质和地球化学特征

Geological and geochemical features of the cover rock series of Foping dome,Qinling orogenic belt

地质和地球化学研究表明，佛坪穹隆盖层岩系主要由晚震旦—晚古生代地层组成，呈变质程度不等的变质岩产出，构成以佛坪基底杂岩为核心的中心式递增变质带。认为该岩系经历了多期构造变形，与穹隆核部基底杂岩以剪切带或断层接触，其原岩为陆源碎屑岩－碳酸盐岩组合，形成于扬子板块北缘的被动大陆边缘（Ｚ２－Ｐｚ１）和秦岭微板块内的陆表海（Ｐｚ２）沉积环境。

Geological and geochemical study shows that the cover rock series of Foping dome consists of matamorphic rocks with different degrees of metamorphism,which formed the zone of progressive metamorphism of central type surrounding the Foping complex and came from Z 2 Pz 2 strata.The series underwent multiple phases of deformation and got in touch with the core complex of the dome by shear zons or faults.The protolith of the cover rock series composed mainly of micro clastic rocks and carbonate formed in the sedimentary environment of passive continental margin of Yangtze Plate(Z 2 Pz 1)and epicontinental sea in Qinling Micro plate(Pz 2).