鲁西早前寒武纪变质岩区变质砾状岩石成因类型及其地质意义

GENETIC TYPES OF METAMORPHOSED PSEPHITIC ROCKS OF THE EARLY PRECAMBRIAN METAMORPHIC TERRANE IN WESTERN SHANDONG AND THEIR GEOLOGICAL SIGNIFICANCE

鲁西早前寒武纪结晶基底中，分布有热液结晶型、火山碎屑沉积型、陆源碎屑沉积型和构造改造型四种成因类型包变质砾状岩石。本文对其形态、规模、产状及砾石特征等进行了分析。据变质砾状岩石性质推测，在平邑县南涝坡—泰安市化马湾一带，泰山群形成之前地表岩石主要为斜长花岗岩，并经历过一期变形变质作用。

There exist four genetic types of metamorphosed psephitic rocks in the early precambrian Ctystalline basement in western Shandong,i.e. hydrothermal crystalline,terrigenous clastic sedimentary,volcaniclastic sedimentary and tectonic reformation types,which have different identification characters,respectively. Inferred from the psephite character it is believed that before the formation of the Taishan Group in West Shandong Province there were predominantly plagiogranitic rocks on the surface which had undergone a metamorphic-deformational event.