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Earthquake-induced Soft-sediment Deformation Structures in the Dengfeng Area,Henan Province,China:Constraints on Qinling Tectonic Evolution during the Early Cambrian

查看全文 作　　者：YANG [1]Wentao;WANG [1]Min;QI Yong'[1]an 高影响力作者 机构地区：[1]Institute of Resources and Environment,Henan Polytechnic University高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2015年第89卷第6期,共12页高影响力期刊 基　　金：granted by the doctor foundation of Henan Polytechnic University(NO:B2013-076);the National Nature Science Foundation of China(NO:41472083;41440016) 摘　　要：Soft-sediment deformation structures are abundant in the Cambrian Zhushadong and Mantou formations of the Dengfeng area, Henan Province, China. Soft-sediment deformation structures of the Zhushadong Formation consist of fluidized deformation, synsedimentary faults, seismo-folds and plastic deformation; the Mantou Formation is dominated by small-scale horst faults, intruded dikes, fluidized veins, and seismo-cracks. These structures are demonstrated to be earthquake-related by analysis of trigger mechanisms, and may indicate the activity of the Qinling tectonic belt during the early Cambrian. Furthermore, the assemblages of soft-sediment deformation structures altered with time: large-scale, intense deformation in the Zhushadong Formation alters to small-scale, weak deformation in the Mantou Formation. This striking feature may have been caused by changes in hypocentral depth from deep-focus to shallow-focus earthquakes, indicating that the Qinling tectonic belt developed from the subduction of the Shangdan Ocean to the extension of the Erlangping back-arc basin. This study suggests that soft-sediment deformation structures can be used to reveal the activity of a tectonic belt, and, more importantly, changes in deformation assemblages can track the evolution of a tectonic belt. 关 键 词：秦岭构造带 变形构造 构造演化 早寒武世 地震裂缝 沉积物 河南地区 中国
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