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Multistage Deformation in the Northeastern Segment of the Jiangshao Fault (Suture) Belt: Constraints for the Relationship between the Yangtze Plate and the Cathaysia Old Land
作者姓名:ZHANG Jin  LI Jinyi  XIAO Wenxi  FENG Qianwen and MA Zongjin
作者单位:1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China. 2 Department of Chang Qing Geophysical Survey, Geophysical Company Limited, China National Petroleum Corporation, Xi’an 710000, Shaanxi, China. 3 Institute of Geology, China Earthquake Administration, Beijing 100029, China
基金项目:This article was funded by the Nonprofit Special Research Program "The formation and destruction of northeastern segment of Cathaysia-the Yangtze Plate Suture Zone and their mineralization" (No. 200811015) from the Ministry of Land and Resource, and the Land Resource Survey Project of the Ministry of Land and Natural Resources, China “The convergence and breakup process of main blocks of China and their geological background for mineralization” (Nos. 1212011121064, 1212011121068) from the China Geological Survey.
摘    要:Multistage deformation events have occurred in the northeastern Jiangshao Fault (Suture) Belt. The earliest two are ductile deformation events. The first is the ca. 820 Ma top-to-the-northwest ductile thrusting, which directly resulted from the collision between the Cathaysia Old Land and the Chencai Arc (?) during the Late Neoproterozoic, and the Jiangnan Orogenic Belt that formed as the ocean closed between the Yangtze Plate and the jointed Cathaysia Old Land and the Chencai Arc due to continuous compression. The second is the ductile left-lateral strike-slipping that occurred in the latest Early Paleozoic. Since the Jinning period, all deformation events represent the reactivation or inversion of intraplate structures due to the collisions between the North China and Yangtze plates during the Triassic and between the Philippine Sea and Eurasian plates during the Cenozoic. In the Triassic, brittle right-lateral strike-slipping and subsequent top-to-the south thrusting occurred along the whole northeastern Jiangshao Fault Zone because of the collision between the North China and Yangtze plates. In the Late Mesozoic, regional extension took place across southeastern China. In the Cenozoic, the collision between the Philippine Sea and Eurasian plates resulted in brittle thrusts along the whole Jiangnan Old land in the Miocene. The Jiangshao Fault Belt is a weak zone in the crust with long history, and its reactivation is one of important characteristics of the deformation in South China; however, late-stage deformation events did not occur beyond the Jiangnan Old Land and most of them are parallel to the strike of the Old Land, which is similar to the Cenozoic deformation in Central Asia. In addition, the Jiangnan old Land is not a collisional boundary between the Yangtze Plate and Cathaysia Old Land in the Triassic.

关 键 词:intraplate  deformation    Jiangshao  Fault  (Suture)  Belt    Yangtze  Plate    Cathaysia  Old  Land    Jiangnan  Old  Land
收稿时间:1/7/2013 12:00:00 AM
修稿时间:5/3/2013 12:00:00 AM

Multistage Deformation in the Northeastern Segment of the Jiangshao Fault (Suture) Belt: Constraints for the Relationship between the Yangtze Plate and the Cathaysia Old Land
Authors:ZHANG Jin  LI Jinyi  XIAO Wenxia  FENG Qianwen  MA Zongjin
Institution:1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2. Department of Chang Qing Geophysical Survey, Geophysical Company Limited, China National Petroleum Corporation, Xi'an 710000, Shaanxi, China
3. Institute of Geology, China Earthquake Administration, Beijing 100029, China
Abstract:Multistage deformation events have occurred in the northeastern Jiangshao Fault (Suture) Belt. The earliest two are ductile deformation events. The first is the ca. 820 Ma top‐to‐the‐northwest ductile thrusting, which directly resulted from the collision between the Cathaysia Old Land and the Chencai Arc (?) during the Late Neoproterozoic, and the Jiangnan Orogenic Belt that formed as the ocean closed between the Yangtze Plate and the jointed Cathaysia Old Land and the Chencai Arc due to continuous compression. The second is the ductile left‐lateral strike‐slipping that occurred in the latest Early Paleozoic. Since the Jinning period, all deformation events represent the reactivation or inversion of intraplate structures due to the collisions between the North China and Yangtze plates during the Triassic and between the Philippine Sea and Eurasian plates during the Cenozoic. In the Triassic, brittle right‐lateral strike‐slipping and subsequent top‐to‐the south thrusting occurred along the whole northeastern Jiangshao Fault Zone because of the collision between the North China and Yangtze plates. In the Late Mesozoic, regional extension took place across southeastern China. In the Cenozoic, the collision between the Philippine Sea and Eurasian plates resulted in brittle thrusts along the whole Jiangnan Old land in the Miocene. The Jiangshao Fault Belt is a weak zone in the crust with long history, and its reactivation is one of important characteristics of the deformation in South China; however, late‐stage deformation events did not occur beyond the Jiangnan Old Land and most of them are parallel to the strike of the Old Land, which is similar to the Cenozoic deformation in Central Asia. In addition, the Jiangnan old Land is not a collisional boundary between the Yangtze Plate and Cathaysia Old Land in the Triassic.
Keywords:intraplate deformation  Jiangshao Fault (Suture) Belt  Yangtze Plate  Cathaysia Old Land  Jiangnan Old Land
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