During the Mesoproterozoic, the northern SinoKorean Plate experienced a period of intensive tectonic extension and breakup,thus formed the YanLiao Aulacogen. Abundant palaeoearthquake records has been preserved in the Chuanlinggou and Gaoyuzhuang Formations of the Changcheng System （1800—1400 Ma） and the Wumishan Formation （ 1200 Ma） of the Jixian System of the Mesoproterozoic. These earthquake records are characterized by various liquefied deformations of soft sediments such as the liquefied sandveins, microspar and coarsespar veins in the carbonate rocks, limestone dike, liquefied breccia, hydroplastic deformation, various curly deformations, loop bedding, graded fault in the interval, and the brittle deformation of the early diagenetic stage. These deformations of earthquake origins are always associated with the synsedimentary faults. Based on the earthquake records and volcanic activities, the SinoKorean Plate experienced at least two episodes of intraplate breakups. One occurred between 1800—1400 Ma, and the other at about 1200 Ma with the latter one resulting in the formation of the YanLiao Aulacogen. The palaeogeographic framework of the YanLiao Aulacogen was connected with the two breakups of the SinoKorean Plate. The boundary of the palaeosea basin, the lithofacies zone were both controlled by the contemporary faultearthquake. The palaeoenviroment of the YanLiao Aulacogen was a tectonic zone characterized by deeper material vibrancy, active fault movements, major igneous activities and frequent earthquakes.
About author: Qiao Xiufu, was born in 1930. He is a professor on sedimentology and stratigraphy at Institute of Geology, Chinese Academy of Geological Sciences
Cite this article:
. Mesoproterozoic palaeoearthquake and palaeogeography in YanLiao Aulacogen[J]. JOURNAL OF PALAEOGEOGRAPHY, 2007, 9(4): 337-352.
. Mesoproterozoic palaeoearthquake and palaeogeography in YanLiao Aulacogen[J]. JOPC, 2007, 9(4): 337-352.
