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《Chinese Journal of Geophysics》 2016-09
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The effective elastic thickness of the Caroline plate and its adjacent areas

YANG An;FU Yong-Tao;LI An-Chun;Institute of Oceanology,Chinese Academy of Sciences;Key Laboratory of Marine Geology and Environment,Chinese Academy of Sciences;  
The purpose of this work is to study the effective elastic thickness(T_e)of the Caroline plate and its adjacent areas by using free-air gravity anomaly and bathymetric data,in combination with a moving window admittance technique(MWAT).We use the multitaper spectral estimation method to calculate the power spectral density.Correction is obtained through synthetic tests with actual bathymetric data.Results show that the recovered T_eis about 20%lower than the input T_e.The Caroline plate and adjacent areas have a T_erange of 1~34km.The study area includes a wide range of features such as seamounts,plateaux,subduction zones and spreading ridges.The examination of the lithospheric strength for these structures provides important information for the tectonic setting and evolution of the Western Pacific lithosphere.T_e is related to the age of the lithosphere at the time of loading,heat flow and other proxy features.Plots of T_eversus ages of the oceanic crust show that T_eis above the depth of 450 ℃isotherm based on a cooling plate model.For the Magellan seamounts and Marcus-Wake Guyots(MWG)areas,plots of T_eversus the ages of the lithosphere at the time of loading suggest that T_eis ataround the depth of 200 ℃ isotherm based on a cooling plate model.The low isotherm could resulted from the effect of the South Pacific supper plume.Our results also show a negative correlation between heat flow and T_ein the study area.
【Fund】: 中国科学院战略性先导科技专项(XDA1103010102);中国科学院海洋地质与环境重点实验室开放基金(MGE2015KG07)资助
【CateGory Index】: P313;P541
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