Petrogenesis of Mesozoic granitoids and volcanic rocks in South China： A response to tectonic evolution

作     者：Xinmin Zhou Tao Sun Weizhou Shen Liangshu Shu Yaoling Niu 

作者机构：Department of Earth Sciences Nanjing University Nanjing 210093 China. Department of Earth Sciences Durham University Durham DHI 3LE UK. 

出 版 物：《Episodes》 (地质幕（英文版）)

年 卷 期：2006年第29卷第1期

页      面：26-33页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This study is supported by the National Natural Sciences Foundation of China(40132010) the Foundation of the Education Ministry of China(20030284026) 

主　　题：SOUTHEASTERN CHINA CRUSTAL EVOLUTION JAPANESE ISLANDS GEOCHEMISTRY MAGMATISM ASIA ND CONSTRAINTS SUBDUCTION ACCRETION 

摘      要：This paper summarizes the new results on the petrogenesis of Mesozoic granitoids and volcanic rocks in South China. The authors propose that these rocks were formed in time and space as a response to regional tectonic regime change from the continent-continent collision of the Indosinian orogeny within the broad Tethyan orogenic domain in the Early Mesozoic （T1-T3） （Period Ⅰ） to the largely extensional setting as a result of the Yanshanian orogeny genetically associated with the NW-WNW-ward subduction of the paleo-Pacific oceanic lithosphere in the Late Mesozoic （J2-K2） （Period Ⅱ）. Of the Period I Indosinian granitoids, the early （T1-T2^1） ones are syn-collisional, and formed in a compressional setting; the late （T2^2-T3） ones are latecollisional, and formed in a locally extensional environment. During the Period Ⅱ Yanshanian magmatism, the Early Yanshanian （J2-J3） granitoid-volcanic rocks, which are distributed mainly in the Nanling Range and in the interior of the South China tectonic block （SCB）, are characteristic of rift-type intraplate magmatism, whereas the Late Yanshanian K1 granitoidovolcanic rocks are interpreted as genetically representing active continental margin magmatism. The K2 tholeiitic basalts interlayered with red beds are interpreted as genetically associated with the development of back-arc extensional basins in the interior of the SCB. The Yanshanian granitoid-volcanic rocks are distributed widely in South China, reflecting extensional tectonics within much of the SCB. The extension-induced deep crustal melting and underplating of mantle-derived basaltic melts are suggested as the two principal driving mechanisms for the Yanshanian granitic magmatism in South China.