陈蔡早古生代俯冲增生杂岩对华夏与扬子地块拼合过程的指示意义

doi:10.13278/j.cnki.jjuese.20170022

Abstract

Abstract: The timing and model of the collage between Cathaysia block and Yangtze block have been debated for a long time. In this study, a detailed profile anatomy from "Chencai Group" was carried out on outcrop scale in Zhejiang. The field geological survey showed that the "Chencai Group" mainly consists of exotic rocks and matrix. The metamorphic age of the marble and amphibolite from the exotic rocks are (424.7±2.9) and (420.6±1.8) Ma respectively, and their diagenesis ages fall between (479.2±9.5)-(424.7±2.9) Ma and (507.7±7.8)-(420.6±1.8) Ma respectively. The protoliths of amphibolites show the OIB characteristics similar to those of alkaline basalts, and the marble protoliths belong to marine carbonate rocks that together make up the combination of ocean island seamount. The provenance of autochthonous feldspar quartz sandstone was the ancient crust in a continental margin and continental arc environment aged between 3 620-1 530 Ma. The protoliths of amphibolites were island arc tholeiite formed in a subduction zone, and Nb-rich basalts formed in a subduction environment,and alkaline basalts with OIB features in an ocean island seamount environment. The LA-MC-ICP-MS zircon U-Pb data indicated that the metamorphic age of the matrix garnet-bearing biotite-plagioclase gneiss is (441.0±3.0) Ma, with detrital age of 840-780 Ma. These data demonstrated that the source of the gneisses was mainly formed in the Neoproterozoic, with the youngest depositional age of 598 Ma, an Early Paleozoic sedimentary strata. The recognition of the rock units in the Chencai region showed that the "Chencai Group" belonged to the early Paleozoic subduction accretionary complex. In combination with the Caledonian granulite and garnet amphibolite in the Longyou area, the collision between the Cathaysia and Yangtze block occurred during 445-420 Ma.

Key words: subduction-accretionary complex, Caledonian, Cathaysia block, Yangtze block, ocean island seamount, Chencai Group, geochemistry

CLC Number:

P585.3

Zhao Xilin, Jiang Yang, Xing Guangfu, Yu Shengyao, Peng Yinbiao, Huang Wencheng, Wang Cunzhi, Jin Guodong. Chencai Early Paleozoic Subduction-Accretionary and Their Restrictions on Collage Between Cathaysia and Yangtze Block[J].Journal of Jilin University(Earth Science Edition), 2018, 48(4): 1135-1153.

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Chencai Early Paleozoic Subduction-Accretionary and Their Restrictions on Collage Between Cathaysia and Yangtze Block

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