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《Chinese Journal of Geophysics》 2005-03
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Effects of mantle flow on generation and distribution of global lithospheric stress field

WANG Jian, YE Zheng_Ren Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China  
We apply a kinematic simulation method to perform modeling for the global lithospheric stress field induced by mantle flow. Both the internal density anomalies and surface plate movements drive the mantle circulation. Mantle flow causes normal stress and tangential stresses at the base of the lithosphere, which affect or even lead to lithospheric stress field and lithospheric deformation. Our simulation shows that the agreement between predictions and observations is good in most regions. Most subduction zones and continental collisions, such as the circum_Pacific subduction zone and the collision zone between the India and Eurasia plate, are under compression. While ocean ridges, such as the east Pacific ridge, the Atlantic ridge and the east African rift, are under tension. And hotspots preferentially occur in regions where calculated stress is tensile. Calculated directions of the maximum horizontal principal compressive stress are in accord with observed principal stress directions in the mass except for some regions such as the northwest Pacific subduction zone and the Qinghai_Tibet Plateau. Our study shows that, mantel flow plays an important role in generating and distribution of the stress field within the lithosphere.
【Fund】: 国家自然科学基金 (4 0 2 740 3 6);; 海洋石油总公司与中国科学院联合攻关项目 (5 0 2 12 910 )联合资助
【CateGory Index】: P551
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