DOI: 10.1016/j.tecto.2021.228993
论文题名: Geodynamic processes inferred from Moho and Curie depths in Central and Southern African Archean Cratons
作者: Akinrinade O.J. ; Li C.-F. ; Afelumo A.J.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 815 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170762
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
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]. Tectonophysics,2021-01-01,815