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《Acta Petrologica Sinica》 2016-04
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Two important Cretaceous deformation events of the Dunhua-Mishan Fault Zone,NE China

SUN XiaoMeng;ZHANG XuQing;HE Song;WANG PuJun;ZHENG Han;WAN Kuo;LI DuoZi;Collage of Earth Sciences,Jilin University;  
This paper reports on the~(40) Ar /~(39) Ar biotite age of the mylonites,the geometric and kinematic characteristics and forming age of large-scale strike-slip thrust faults in the Dunhua-Mishan Fault Zone,to reveal the tectonic attribute of two important deformation events in the fault zone. The~(40) Ar /~(39) Ar weighted average age of biotite from the granitic mylonite in the Mishan City of Heilongjiang Province is 132. 2 ± 1. 2Ma,which yields the cooling age of the extension event and it is the product of Cretaceous Hauterivian-Albian intensive regional extension in the continental margin of Northeast Asia. A series of large-scale strike-slip thrust faults and fault-related folds in the Mishan City to Qingyuan County of Liaoning Province indicate that the age of dextral strike-slip thrust event is in the lateend stage of Late Cretaceous. This large-scale event has a wide influence scope,which leads to an intensive reformation in the whole fault zone and forms a ramp type fault system. Comparing the strike-slip thrust faults in study area with compressional structures in the middle segment of the Tan-Lu Fault Zone in Shandong Province,we conclude that both the north and middle segment of the Tan-Lu Fault Zone underwent an intensive strike-slip thrust event in the latest stage of Late Cretaceous and they share a similar structural characteristics and tectonic attribute with each other.
【Fund】: 中国地质调查局地质调查项目(12120113098100);; 国家“973”项目(2009CB219305)联合资助
【CateGory Index】: P542.3
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