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中国科学院地质与地球物理研究所2013年度（第13届）...

作者： SI ShaoKun TIAN XiaoBo ZHANG HongShuang TENG JiWen Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

The baikal rift is the most seismically active continental rift in the world and is significant for studying the dynamics of continental rifts,although its precise dynamic mechanisms remain *** calculated receiver functions(1748)from Global Seismographic Network seismic stations TLY and ULN and stacked receiver functions in different *** we present discontinuities at depths of 410 km and 660 km and thickness of the mantle transition zone(MTZ)beneath the study area. The MTZ structure shows an obvious thickening(292 km)in the baikal rift zone except for an area of limited thinning(230 km),whereas it is basically normal(250 km)beneath the Mongolian area,to the southeast of the baikal *** these results with previous findings,we propose that the large-scale thickening beneath the baikal rift zone is likely to be caused by the Mesozoic collision between the Siberian Platform and the Mongolia-North China Block or magmatic intrusion into the lower crust,which would result in crust and lithosphere ***,the lower crust becomes eclogitized and consequently detached into the deep mantle because of negative *** detachment not only induces asthenosphere upwelling but also accelerates mantle convection of water detached from the subducted slab,which would increase mantle melting,while both processes promote the development of the *** preliminary results indicate that the detachment and the consequent hot upwelling have an important influence on the development of the baikal rift,and a small-scale mantle upwelling indicated by the located thinning may have destroyed the lithosphere and promoted this development.

关键词： baikal rift zone mantle transition zone P wave receiver function

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蒙古Khuvsgul湖HDP09湖芯中地下玄武岩的K-Ar年龄:对贝加尔裂谷起始时间的估计（英文）

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地球环境学报 2011年第3期2卷 462-466页

作者： HASEBE Noriko ITO Kazumi HASEBE Akihiro NARANTSETSEG Ts OYUNCHIMEG Ts IVANOV Egor V KASHIWAYA Kenji Institute of Nature and Environmental Technology Kanazawa University Frontier Science Organization Kanazawa University Institute of Geology and Mineral Resources MAS Institute of Geochemistry Siberia Branch of RAS

HDP09 core drilled in Lake Khuvsgul,Mongoria,at 50°52'48 'N,100°26'30' E where the water depth is 222.25 m reached to the depth of ~60 m below lake floor in *** bottom part of the core consists of alkali *** basalt consists of the basement of the lake Khuvsgul based on its bulk chemistry and core position plotted on the seismic profile.K-Ar age of the basalt is(8.5±0.2) Ma,which is concordant with the on-land basalt distributed in the eastern part of the lake,and implies the maximum age of the Lake Khuvsgul formation.

关键词： Lake Khuvsgul baikal rift zone alkali basalt K-Ar dating

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