The Yanshanian Orogeny and Two Kinds of Yanshanides in Eastern-Central China
The Tan-Lu Fault was once a transform fault in the Paleotethys,west of which was the Qinling-Dabie Ocean separating the Yangtze Craton from the North China Craton,and east of which was the Su-Lu Ocean separating the SuWan Block from the Jiao-Liao Craton.The Qinling-Dabie Ocean closed in the Indosinian orogeny,which created the China-Southeast Asia Subcontinent,with the Tan-Lu Fault becoming a marginal shear zone along the newly-formed amalgamated subcontinent.The Su-Lu Ocean subducted partly in the Indosinian.orogeny,but not closed.In the Jurassic and Early Cretaceous,the Su-Wan Block drifted northwards with subduction of the Su-Lu Ocean and moved westwards to converge the subcontinent by sinistral shearing of the ENE-striking fractures.The Su-Lu Ocean finally closed and the SuWan Block collided with the Jiao-Liao Craton in the Early Cretaceous,which constituted a part of the magnificent interplate Yanshanides.The interplate orogeny rejuvenated the fossil sutures and deep fractures,as well as the Indosinian orogen,and the intraplate (intracontinental) Yanshanian orogeny occurred in the subcontinent.The East Asia Yanshanides,consisting of the interplate orogens in the outer side and the intraplate orogens in the inner side,collapsed quickly in the latest Early Cretaceous and Late Cretaceous.The eastern China area entered a tensile period from the Eogene,and the tectonic differentiation between the central and eastern China areas since the Jurassic was further strengthened.
作 者： Wu Genyao 作者单位： Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029 刊 名： 地质学报（英文版） SCI 英文刊名： ACTA GEOLOGICA SINICA 年，卷(期)： 2005 79(4) 分类号： P5 关键词： Yanshanian orogeny interplate orogen intraplate (intracontinental) orogen East Asia Yanshanides easterncentral China