摘要
胶南造山带范围指安丘－莒县断裂以东、五莲－桃村断裂东南、嘉山－响水河断裂以北狭长隆起区，是秦岭－大别造山带的东延部分。十多年来该区开展的区调工作和专题研究取得了重要进展，成果表明该造山带主要由晚元古代晋宁期及震旦期变质变形侵入岩组成，另有少量中元古代四堡期超基性－基性侵入岩分布；变质地层为晚太古代胶东岩群和早元古代荆山群、粉子山群，呈孤岛状残留于晚元古代花岗岩中。榴辉岩沿造山带广泛分布，部分榴辉岩含柯石英和微粒金刚石，表明经历过超高压变质作用。除此，造山带东段还有麻粒岩及麻粒岩相岩石出露。胶南造山带主体是晚元古代时由华北板块与扬子板块碰撞造山作用形成的，韧性变形作用强烈，可划分为早期中深部构造相推覆韧性剪切带和晚期浅部构造相走滑韧性剪切带。
The Jiaonan orogenic belt is a long and narrow uplifted situated to the east of the Anqiu-Juxian fault,to the southeast of the Wulian-Taocun fault and to the north of the Jiashan-Xiangshuihe fault. It is the east extension of the Qinling-Dabei orogenic belt. Over the last ten years, new developments have been gained in the regional surveys and special subject research in this area. These developments prove that the orogenic belt consists mainly of metamorphosed and deformed intrusive rocks of the Neo-proterozoic Jinning and Sinian phases, little ultrabasic-basic intrusive rocks of the Meso-proterozoic Sibao phase and some deformed strata,such as the late Archean Jiaodong group,Palaeo-proterozoic Jinshan and Fenzishan groups which are residued in the Neo-proterozoic granites. Eclogites spread widely along the orogenic belt. Some eclogites contain coesite and micro-grained diamond indicating that they have experienced ultrahigh-pressure metamorphism. In addition,in the east part of the orogenic belt, granulite and graulite-factes rocks are exposed. The Jinonan orogenic belt was formed by the collision-orogenism of the north China plate and the Yangtz plate during the Neo-proterozoic when the ductile deformation was intensive. It can be divided into ductile shear zones of medium-deep level structural-factes in the early stage and the slip ductile shear zones of shallow-level structural-factes in the late stage.
出处
《山东地质》
1997年第1期1-11,共11页
Geology of Shandong
