苏鲁造山带浅变质岩的成因及其大地构造意义

苏鲁造山带超高压变质带内部及其北缘,出露仅经过绿片岩相变质作用的浅变质岩系。通过对该浅变质岩的区域分布、地质特征及地球化学的综合研究,表明这些浅变质岩系与大别-苏鲁造山带大陆板块俯冲存在密切的成因关系,为扬子板块俯冲过程中被刮削下来的构造残片,构成大陆板块俯冲过程中形成的构造加积杂岩。在此基础上,厘定了苏鲁造山带的构造成因模型,并对苏鲁造山带的东延问题进行了讨论。

Geological Genesis and Tectonic Implications of Low-grade Metamorphic Rocks in Sulu Orogenic Belt

According to the geological occurrences of low-grade metamorphic rocks and high to ultrahigh pressure metamorphic rocks(UHP) in the Sulu orogenic belt, There are the low-grade metamorphic rocks which underwent greenschist facies metamorphism in the middle Dabie ultrahigh pressure(UHP) metamorphic belt and at the north edge of the UHP metamorphic belt. By studying thg area distributing,geology character and geochemistry of the low-grade metamorphic rocks, it indicates that the original rocks of the low-grade metamorphic rocks and part of the high pressure-UHP rocks not only tie tightly up on their causes of formetion and together experienced teconic events during the subduction-colliding of the Yangze plate, but also make sure that the low-grade metamorphic rocks are the structure tags which due to subduction of Yangze plate. In terms of the accretionary wedge model of plate subduction, the geodynamic processes of formation and evolution are explored for the different grades of metamorphic rocks in the Sulu orogenic belt. The results provide constraints on the tectonic locations of subduction and suture zones between the Yangtze and Sino-Korean plates.