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《Geoscience》 2018-05
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Discussion on the Distribution and Main Controlling Factors of Mud Volcanoes in Makran Accretionary Wedge,Northern Indian Ocean

GONG Jianming;LIAO Jing;ZHANG Li;HE Yongjun;ZHAI Bin;MENG Ming;CHENG Haiyan;Qingdao Institute of Marine Geology;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology;Key Laboratory of Gas Hydrate,Ministry of Natural Resources;Guangzhou Marine Geological Survey;School of Ocean Sciences,China University of Geosciences;Qingdao Geological Exploration Institute of China Metallurgical Geology Bureau;  
In order to study the distribution and main controlling factors of mud volcanoes in the active continental margin in low angle subduction background,a large amount of data on sedimentary strata,fault structures,mud volcanoes or mud diapir have been collected in the Makran accretionary wedge of northern Indian Ocean. The comprehensive analysis results show that the sedimentary strata in the study area are mainly composed of the upper and lower parts,among which the lower hemipelagic muddy strata have the characteristics of"east thick and west thin",while the upper coarse Makran sand strata have the characteristics of high speed deposition. The characteristics of density inversion and high sedimentary rate provide the material basis for the formation of mud diapir or mud volcano. In Makran accretionary wedge,the convergence rate between Arabian plate and Eurasian plate is characterized by"east fast and west slow",moreover,the strike-slip faults and mudvolcanoes developed on both sides of the east and west. Considering the convergence rate of the Mediterranean Sea Ridge with the same low subduction angle and the distribution characteristics of mud volcanoes,it is considered that the mud volcanoes on both sides of the east and west are mainly controlled by strike-slip faults,while the mud volcanoes in the accretionary wedge are mainly controlled by the convergence rate,thrust faults and density inversion,showing the characteristics of "the East mud volcanoes are more than the West".
【Fund】: 国家自然科学基金项目“祁连山冻土区天然气水合物气源成因研究”(41273066);; 国家青年科学基金项目“南海北部神狐海域深水水道演化与水合物成藏的关系”(41406080);; 国家重点研发计划项目(2018YFC0310000)
【CateGory Index】: P618.13;P736
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