Geochemical Characteristics of the Basic and Magnesian Metamorphic Rocks in Longyou Area,Zhejiang Province and Their Tectonic Setting
Dong Xuefa
Tang Zengcai
Chen Zhongda
Yu Shengqiang
Zhao Xudong
Zhou Zongyao
Wu Xiaoyong
Xiao Qinghui
Abstract：A medium and high grade metamorphic rock series is exposed in Longyou area located in the southeast margin of Yan-gtze block and Cathaysia block,which is important for the interpretation of South China Predevonian tectonic pattern.But the tectonic setting of its formation remains unknown presently.It is found out these rocks can be divided into three types:“N-MORB”,“T-MORB”and “E-MORB”type rock by a basic and magnesian metamorphic rock geochemical study in this paper The protoliths of the “N-MORB”is mainly formed in the intra-oceanic arc,the “T-MORB”is mainly formed in the transition of mid-oceanic ridge and the volcanic arc,and the “E-MORB”type rock is formed in the enrichment of mid-oceanic ridge,epiconti-nental arc and intraplate environment.Rock diagenesis environment diversity shows that the metamorphic rock of Longyou area is a tectonic mélange and its forming process is related with the ancient oceanic crust subduction,which also provides a reasona-ble explanation for the output,positioning of the pomegranate amphibolite in Longyou area.
Keywords：basic metamorphic rocksmagnesia metamorphic rocksgeochemistrytectonic settingLongyouZhejiang Province
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 1322-1333 )