NDLI: Prevalent thickening and local thinning of the mantle transition zone beneath the Baikal rift zone and its dynamic implications

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Prevalent thickening and local thinning of the mantle transition zone beneath the Baikal rift zone and its dynamic implications

Content Provider	Springer Nature Link
Author	Si, ShaoKun Tian, XiaoBo Zhang, HongShuang Teng, JiWen
Copyright Year	2013
Abstract	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 controversial. We calculated receiver functions (1748) from Global Seismographic Network seismic stations TLY and ULN and stacked receiver functions in different bins. Here 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 rift. Combining 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 thickening. Thus, the lower crust becomes eclogitized and consequently detached into the deep mantle because of negative buoyancy. The 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 rift. Our 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.
Starting Page	31
Ending Page	42
Page Count	12
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	56
Issue Number	1
e-ISSN	18691897
Language	English
Publisher	SP Science China Press
Publisher Date	2013-01-12
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Baikal rift zone mantle transition zone P wave receiver function Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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