对胶南造山带基础地质问题的新认识

:胶南造山带主体是由晚元古代同造山双花岗岩组成的造山带 ,有少量造山前幔源深成岩及造山后碱性花岗岩类。零星分布的地层残片可分为晚太古代胶东岩群 ,早元古代荆山群、粉子山群及震旦纪朋河石岩组。造山带经历了高压相系—中低压相系多期、多相变质作用 ,主要构造形迹为韧性剪切带 ,其次为穹隆构造、弧形构造。胶南造山带可分为北段、中段和南段 3部分 ,北段、中段属于华北板块南部边缘带 ,南段属扬子板块北部边缘带。

The latest understandings of fundamental geology of Jiaonan orogenic belt

Jiaonan orogenic belt is mainly composed of the synorogenic bimodal granite of the Upper Proterozoic Subera, besides a little of pre orogenic mantle derived plutonic rock and post orogenic alkaline granite. The occasional exposed stratigraphic remains can be divided into four types:late Archaeozoic Jiaodong Group, lower Proterozoic Jingshan Group and Fenzishan Group, and Sinian Pengheshi Formation complex. The belt experienced a series of metamorphic faces from high pressure to middle and low pressure in stages, and essential structural features are ductile shear belt, dome and arc structure. Jiaonan orogenic belt can be divided into three segments: the north and middle segments,which belong to south margin of North China Plate, and the south segment a part of the north margin of Yangtze Plate.