Effective Elastic Thickness of the Lithosphere in the Mariana Subduction Zone and Surrounding Regions and Its Implications for Their Tectonics  

作　　者：LING Zilong ZHAO Lihong WU Zhaocai ZHI Pengyao DING Renwei 

机构地区：[1]College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China [2]Second Institute of Oceanography,Ministry of Nature Resources,Hangzhou 310012,China [3]Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology,Qingdao266237,China

出　　处：《Journal of Ocean University of China》2022年第4期827-836,共10页中国海洋大学学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(Nos.41676039 and 4207061006);the Shandong Young Teacher Growth Program.

摘　　要：To understand the rheology,structure,and tectonics of the lithosphere in the Mariana subduction zone and surrounding regions,we calculated the effective elastic thickness of the lithosphere(Te)in these areas using the improved moving window admittance technique(MWAT)method.We find that smaller data grid spacing can better reflect Te variations in the subduction zone.The Te of the study region ranges from 0 to 47 km.The Te is reduced from 40 km on the seaward side of the outer-rise region to 1-2 km along the trench axis.The lithospheric breaking distance from the trench axis ranges from 0 to 250 km.We suggest that the intermediate Te values in seamounts and high Te values on the seaward side of the outer-rise region respectively reflect the‘fossil’rheological state and current lithospheric strength of the Pacific plate.The faulting induced by the downward bending of subducting plate not only ruptures the lithosphere but also contributes to the mantle serpentinization,significantly reducing the lithospheric strength.The largest breaking distance of the Ogasawara Plateau may be due to the increase in the mass load of the subducting plate in the Ogasawara Plateau and the significant horizontal bending force in the plate caused by the resistance of seamounts to subduction.Furthermore,a good positive correlation exists between the breaking distance and subduction dip angle along the trench axis.We suggest that the subducting plate with a larger breaking distance is likely to form a larger subduction angle.

关 键 词：effective elastic thickness moving window admittance technique Mariana subduction zone plate bending 

分 类 号：P736[天文地球—海洋地质]