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DOI	10.1016/j.tecto.2021.228993
	Geodynamic processes inferred from Moho and Curie depths in Central and Southern African Archean Cratons
	Akinrinade O.J.; Li C.-F.; Afelumo A.J.
发表日期	2021
ISSN	00401951
卷号	815
英文摘要	Central and Southern Africa is home to major Archean Cratons, flanked by Proterozoic mobile belts. The region is characterized by anomalously high topography and shallow Curie depth (Zb). Factors controlling topography and Zb anomalies in old continental crusts remain poorly understood. In this study, we present high-resolution Moho undulation (Zm) derived with gravity spectral technique. Archean Cratons and Proterozoic belts are mostly characterized by deep Moho (>36 km), whereas the Moho depths in Mozambique belts is mostly shallow (~26 to 41 km). Extremely shallow Zb (<10 km) is dominant in Archean Cratons, whereas intermediate Zb (10–25 km) is prevalent in the mobile belts. The Curie points are mostly above the Moho. Low surface heat flow (Qs) in Archean Cratons indicate that Zb is not correlated with thermal perturbation. Shallow Zb are mostly found in areas with low Vp/Vs ratio, predominantly felsic lower crust and sharp Moho. Shallow Zb also correlate with intense metasomatism and mineral enrichment, as well as depletion in basaltic components and geochemical overprinting by multiple episodes of melt and fluid infiltration. Crustal composition is the main factor that controls shallow Zb in Central and Southern Africa Archean Cratons. The regional elevated topography is not due to thermal perturbation as mostly argued by mantle plume hypothesis, but may be caused by regional thermo-chemical mantle upwelling dominated by composition. © 2021 Elsevier B.V.
关键词	Archean Craton crustal composition Curie depth Moho depth Southern Africa thermal perturbation
英文关键词	Belts; Planetary surface analysis; Continental crusts; Crustal composition; Geodynamic process; Mantle plume hypothesis; Mantle upwellings; Spectral techniques; Surface heat flow; Thermal perturbations; Topography
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207929
作者单位	Institute of Marine Geology and Resources, Zhejiang University, Zhoushan, 316021, China; Hainan Institute, Zhejiang University, Sanya, 572025, China; Department of Marine Science and Technology, Federal University of Technology Akure, Nigeria; Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
推荐引用方式 GB/T 7714	Akinrinade O.J.,Li C.-F.,Afelumo A.J.. Geodynamic processes inferred from Moho and Curie depths in Central and Southern African Archean Cratons[J],2021,815.
APA	Akinrinade O.J.,Li C.-F.,&Afelumo A.J..(2021).Geodynamic processes inferred from Moho and Curie depths in Central and Southern African Archean Cratons.Tectonophysics,815.
MLA	Akinrinade O.J.,et al."Geodynamic processes inferred from Moho and Curie depths in Central and Southern African Archean Cratons".Tectonophysics 815(2021).