globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.09.012
Scopus记录号: 2-s2.0-85054193912
论文题名:
Absence of thermal influence from the African Superswell and cratonic keels on the mantle transition zone beneath southern Africa: Evidence from receiver function imaging
作者: Sun M.; Fu X.; Liu K.H.; Gao S.S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503
起始页码: 108
结束页码: 117
语种: 英语
英文关键词: African Superswell ; Lithosphere ; mantle transition zone ; receiver function ; Southern Africa
Scopus关键词: Geology ; Mathematical models ; African Superswell ; Lithosphere ; Mantle transition zone ; Receiver functions ; Southern Africa ; Naval architecture
英文摘要: The depths of the 410 km (d410) and 660 km (d660) discontinuities beneath southern Africa, which is presumably underlain by the lower-mantle African Superswell, are imaged in 1∘ radius consecutive circular bins using over 6400 P-to-S receiver functions (RFs) recorded by 130 seismic stations over a 27 yr period. When the IASP91 standard Earth model is utilized for moveout correction and time-depth conversion, a normal mantle transition zone (MTZ) thickness of 246 ± 7 km is observed, suggesting that the Superswell has no discernible effect on mantle transition zone temperature. Based on the negligible disparity of the mean MTZ thicknesses between on (246 ± 6 km) and off (246 ± 8 km) cratonic regions, we conclude that the deep Archean cratonic keels possess limited influence on MTZ thermal structure. The apparently shallower-than-normal MTZ discontinuities and the parallelism between the d410 and d660 are mostly the results of upper mantle high wave speed anomalies probably corresponding to a thick lithosphere with a mean thickness of about 245 km beneath the Kaapvaal and 215 km beneath the Zimbabwe cratons. In contradiction to conclusions from some of the previous studies, the resulting spatial distribution of the stacking amplitudes of the P-to-S converted phases at the discontinuities is inconsistent with the presence of an excessive amount of water in the MTZ and atop the d410. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109619
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: College of Earth Science and Research Institute of Unconventional Oil and Gas, Northeast Petroleum University, Daqing, Heilongjiang 163318, China; Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, United States

Recommended Citation:
Sun M.,Fu X.,Liu K.H.,et al. Absence of thermal influence from the African Superswell and cratonic keels on the mantle transition zone beneath southern Africa: Evidence from receiver function imaging[J]. Earth and Planetary Science Letters,2018-01-01,503
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