The principal part of the Middle-Late Proterozoic Yanshan Rift Basin is located in Hebei and Liaoning provinces of North China. An obvious rifting of the Yanshan Basin occurred in the early stage of the Middle Proterozoic, named Changchengian about 1800-1400Ma. Sedimentary fills of the basin during this period are earliest deposits within the covering strata after formation of the crystalline basement of the Archaeozoic-Early Proterozoic.The Changchengian of the early Middle Proterozoic mainly consists of five Formations, namely, Changzhougou, Chuanlinggou, Tuanshanzi, Dahongyu and Gaoyuzhuang Formations.During the Changchengian the palaeotectonic activities of the basin controlled the basin fillings in four ways, that is, synsedimentary faulting, structural tilting, and intent subsidence in basin axis and equilibrium subsidence in entire basin. In particular, the synsedimentary faulting, characterized by abrupt or pulsing activities, controls the distribution of main facies belts of the basin. During the intense periods of the basin, the synsedimentary faulting also caused a series of event depositions, such as palaeo-seismic records, carbonate slumping, clastic turbidites, and volcanism-induced volcanic turbidite deposits. Analyses of palaeocurrent, stratigraphic framework, and special facies belts show that the main axis of the basin is along NE direction. The outlet position, towards open sea, of the intracontinental rift basin probably was located in the north part of the Sino-Korea Paraplatform and the basin infilling during the Changchengian was not obviously affected with the E-W direction (from Chicheng to Beipiao) faulting.
About author: He Zhengjun, born in 1954, graduated from Chinese Academy of Geological Sciences(CAGS) in 1991, and obtained his Ph.D. degree. Now he is a Senior Research Fellow in Institute of Geology, CAGS, and is engaged in sedimentology and regional geology.
Cite this article:
. THE EARLY SYNSEDIMENTARY FAULTING OF THE MIDLLE PROTEROZOIC YANSHAN RIFT AND ITS INFLUENCE ON EVENT SEDIMENTATION[J]. JOURNAL OF PALAEOGEOGRAPHY, 2000, 2(3): 83-91.
. THE EARLY SYNSEDIMENTARY FAULTING OF THE MIDLLE PROTEROZOIC YANSHAN RIFT AND ITS INFLUENCE ON EVENT SEDIMENTATION[J]. JOPC, 2000, 2(3): 83-91.
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