胶南-威海造山带研究进展及重要地质问题讨论

Study Development on Jiaonan-Weihai Tectonic Belt and Discussion of Some Important Geological Problems

摘要:

胶南-威海造山带基底主要由新元古代变质花岗岩组成 ,另有少量变质表壳岩、浅变质碎屑岩、基性—超基性岩及榴辉岩。变质花岗岩可分为同造山花岗岩及后造山花岗岩。造山带之上曾经有过古生代盖层 ,造山带中侵入有三叠纪闪长岩及花岗岩体。在榴辉岩及其围岩中发现了许多高压、超高压变质矿物 ;确认高压、超高压变质作用分早期的超高压榴辉岩相变质作用和晚期的高压绿片岩相变质作用 ;变质地层、超镁铁质岩及部分片麻岩等围岩与榴辉岩经历了相同的超高压变质作用 ,大部分花岗质片麻岩是在超高压变质作用发生后或发生过程中侵入榴辉岩中的。苏鲁造山带是一条以韧性剪切带为格架 ,穹窿构造、褶皱构造相伴随的“无山”的造山带 ;造山带可分为南、北二部分 ,北带主体属于华北板块南缘带 ,而南带主体则属于扬子板块北缘带。南、北带的界线大致与连云港嘉山断裂及近岸断裂一致。造山带南界与响水淮阴断裂一致 ,北界位于五莲—王台—朱吴—牟平一线 ,西侧被郯庐断裂带切割。

Abstract:

The basements of Jiaonan-Weihai tectonic belt are mainly composed of Neo-proterozoic granites, including little amount of metamorphic supracrustal rocks, epimetamorphic clastic rocks, basic-superbasic rocks and eclogites. Metamorphic granites can be divided into syorogenic granites and after orogenic granites. Palaeozoic roof rocks are once occurred on orogenic belt, and Triassic diorites and granites are intruded in it also. Whether ophiolite and its country rocks occurred or not still need do more work to proof. Sulu tectonic belt is a "no mountain" tectonic belt, accompanying with domal structure and fold structure, and a ductile shear belt is its framework; tectonic belt can be divided into north and south part, north part belongs to south edge of Huabei platform, while south part belongs to north edge of Yangtz platform. The boundary of south and north part is conformity with Lianyungang-Jiashan fault and offshore fault. South boundary of tectonic belt is conformity with Xiangshui...