西太平洋洋陆板块碰撞
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摘要
根据地震震中的空间分布判断,西太平洋板块除了沿日本海沟斜向向黑龙江板块大陆下俯冲外,别的地区大洋板块均近垂直向下回流,未向大陆斜向俯冲。究其原因,可能是这些地区的地幔内所存在的大范围柔性低速岩石圈阻挡了大洋板块的斜向俯冲。中国东部岩石圈的剧变不是太平洋板块俯冲到大陆岩石圈所引起的效应,它的构造动力需要重新认识。
The spatial distribution of epicenters indicates that the mantle of the West Pacific remains in the state of flowing fluid,except for the Japan trench,where the Pacific Plate keeps subducting as a plate,owing to the existence of a soft mantle lithosphere in the region.With the same consideration,it is inferred that the Izanagi plate in the Paleo-Pacific might act in a similar manner and never subducted under the Eurasia.Therefore,the dynamic mechanism of the drastic change of lithosphere in the Eastern Part of China must be reconsidered.
The spatial distribution of epicenters indicates that the mantle of the West Pacific remains in the state of flowing fluid,except for the Japan trench,where the Pacific Plate keeps subducting as a plate,owing to the existence of a soft mantle lithosphere in the region.With the same consideration,it is inferred that the Izanagi plate in the Paleo-Pacific might act in a similar manner and never subducted under the Eurasia.Therefore,the dynamic mechanism of the drastic change of lithosphere in the Eastern Part of China must be reconsidered.
引文
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[2]Lina Handayani.Seismic Tomography Constraints on Reconstructing the Philippine Sea Plate and Its Margin[M].12 A Dissertation Submitted to Texas A&M University,2004.
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[6]Bird P.An updated digital model of plate boundaries[J].Geochemistry Geophysics Geosystems,2003,4(3):1027.
[7]袁学诚.再论岩石圈地幔蘑菇云构造及其深部成因[J].中国地质,2007,34(5):737-758.[YUAN Xuecheng.Re-discussion of the lithospheric mantle mushroom structure and its deep causes[J].Geology in China,2007,34(5):737-758.]
[8]Engebretson D C.Relative motions between oceanic and continental plates in the Pacific Basin[J].Special Paper,1985,206:1-59.
[9]万天丰.中国大地构造学纲要[M].地质出版社,1989.[WAN Tianfeng.Outlie of Geotectonics in China[M].Geologcal Publishing House,1989.]
[10]Whittaker J,Muller R D,Sdrolias M.Revised history of Izanagi-Pacific ridge subduction,Hawaii,IODP,poster,2009.
[11]Seton M,Müller R D.Reconstructing the junction between Panthalassa and Tethys since the Early Cretaceous,PESA Eastern Australasian Basins[C].Symposium III Sydney,14-17September,2008.
[12]Hall C E.Catastrophic initiation of subduction following forced convergence across fracture zones[J].Earth and Planetary Science Letters,2003,212:15-30.
[2]Lina Handayani.Seismic Tomography Constraints on Reconstructing the Philippine Sea Plate and Its Margin[M].12 A Dissertation Submitted to Texas A&M University,2004.
[3]张立敏,唐晓明.西太平洋板块俯冲运动与中国东北深震带[J].地球物理学报,1983,26(4):331-340.[ZHANG Limin,TANG Xiaoming.Plate subduction of Western Patific and deep seismic belt of northeastern China[J].Chinese Journal of Geophysics,1983,26(4):331-340.]
[4]Ekstrm G,Dziewonski.The unique anisotropy of the Pacific upper mantle[J].Nature,1998,394:168-172.
[5]Pysklywec R N,Beaumont C,Fullsack P.Modeling the behavior of the continental mantle lithosphere during plate convergence[J].Geology,2000,28:655-658.
[6]Bird P.An updated digital model of plate boundaries[J].Geochemistry Geophysics Geosystems,2003,4(3):1027.
[7]袁学诚.再论岩石圈地幔蘑菇云构造及其深部成因[J].中国地质,2007,34(5):737-758.[YUAN Xuecheng.Re-discussion of the lithospheric mantle mushroom structure and its deep causes[J].Geology in China,2007,34(5):737-758.]
[8]Engebretson D C.Relative motions between oceanic and continental plates in the Pacific Basin[J].Special Paper,1985,206:1-59.
[9]万天丰.中国大地构造学纲要[M].地质出版社,1989.[WAN Tianfeng.Outlie of Geotectonics in China[M].Geologcal Publishing House,1989.]
[10]Whittaker J,Muller R D,Sdrolias M.Revised history of Izanagi-Pacific ridge subduction,Hawaii,IODP,poster,2009.
[11]Seton M,Müller R D.Reconstructing the junction between Panthalassa and Tethys since the Early Cretaceous,PESA Eastern Australasian Basins[C].Symposium III Sydney,14-17September,2008.
[12]Hall C E.Catastrophic initiation of subduction following forced convergence across fracture zones[J].Earth and Planetary Science Letters,2003,212:15-30.
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