New Jurassic Paleomagnetic Results from Southeastern China and Their Geological Implication  

作　　者：WANG Bin ZHANG Guowei 

机构地区：[1]State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi＇an 710069,Shaanxi,China

出　　处：《Acta Geologica Sinica(English Edition)》2011年第4期792-800,共9页地质学报（英文版）

基　　金：funded by postdoctoral and momentous subject research seed money from Northwestern University and (Structure and oil-gas foreground of south China) from China Petrochemical Corporation

摘　　要：A paleomagnetic study was carried out on late Jurassic sediments in the Nanjing area. Stepwise thermal demagnetization was used to isolate the characteristic higher temperature component （HTC）（D=354.0°,I=48.5°,a95=7.8°）,which passes the reversal test.A 24.7±8.7°counter-clockwise rotation relative to the Sichuan area is detected through comparing this new pole（84.4°N,7.0°E, A95=7.7°）with other coeval poles reported from South China.This rotation was conducted by sinistral action of slip faults.These cases presenting in several areas of eastern China indicate that deformation of eastern China is under the effect of subduction from the Pacific Ocean plate.The difference on the paleolatitude of several areas across the Tan-Lu fault zone is calculated and suggests about at most 250 km offset distance after the later Jurassic.A paleomagnetic study was carried out on late Jurassic sediments in the Nanjing area. Stepwise thermal demagnetization was used to isolate the characteristic higher temperature component （HTC）（D=354.0°,I=48.5°,a95=7.8°）,which passes the reversal test.A 24.7±8.7°counter-clockwise rotation relative to the Sichuan area is detected through comparing this new pole（84.4°N,7.0°E, A95=7.7°）with other coeval poles reported from South China.This rotation was conducted by sinistral action of slip faults.These cases presenting in several areas of eastern China indicate that deformation of eastern China is under the effect of subduction from the Pacific Ocean plate.The difference on the paleolatitude of several areas across the Tan-Lu fault zone is calculated and suggests about at most 250 km offset distance after the later Jurassic.

关 键 词：PALEOMAGNETISM late Jurassic Ning-wu basin 

分 类 号：P318.4[天文地球—固体地球物理学] P588.121[天文地球—地球物理学]