DOI: 10.1016/j.epsl.2020.116360
论文题名: Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling
作者: Dong S. ; Li J. ; Cawood P.A. ; Gao R. ; Zhang Y. ; Xin Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 544 语种: 英语
中文关键词: Cretaceous
; crustal thinning
; mantle influx
; seismic reflection
; SINOPROBE
; South China
英文关键词: Architecture
; Metals
; Reflection
; Seismic waves
; Seismology
; Cathaysia block
; Crust-mantle interactions
; Crustal thinning
; Deep seismic reflection profiles
; Derived materials
; Igneous province
; Natural laboratories
; Neoproterozoic
; Structural geology
; crustal thinning
; data interpretation
; fault zone
; magmatism
; mantle structure
; Moho
; Proterozoic
; seismic data
; seismic reflection
; Cathaysia Block
; China
英文摘要: The crustal architecture of the Cathaysia Block, South China, is a key element in understanding the late Mesozoic tectono-magmatic history of East Asia, and includes a spectacular (∼260,000 km2) basin and igneous province that forms a natural laboratory for unravelling the interplay of extension, magmatism and crust-mantle interaction. Here we analyze the whole crustal architecture of East Cathaysia through a ∼300-km-long SINOPROBE deep seismic reflection profile. This profile reveals that East Cathaysia is underlain by two seismically distinct terranes (i.e., the Wuyishan and Coastal terranes), separated by a low-angle, northwest-dipping set of mantle-penetrating reflectors interpreted as the Zhenghe-Dapu fault zone, which documents Neoproterozoic terrane amalgamation and Cretaceous extensional reactivation. The seismic image of the Coastal terrane shows large-scale low reflectivity truncated by arrays of high-reflective subhorizontal bands of layered reflectors, corresponding to an extension-related crustal architecture dominated by extensive Cretaceous magmatism. The layered reflectors are interpreted to represent mantle-derived mafic sills, which document significant magmatic underplating associated with asthenospheric upwelling beneath the terrane. This interpretation accounts for the localized distribution of Cretaceous magmatic rocks in the Coastal terrane. We suggest that the magmatic underplating added large volumes of mantle-derived material to the crust, compensating for the crustal thinning. Such a magma-compensating process might have formed an integral part of crustal reworking and growth in creating the magma-dominated crust and the broadly flat Moho of the Coastal terrane during the Cretaceous. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164943
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210023, China; SinoProbe Center, Chinese Academy of Geological Sciences, Beijing, 100037, China; Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia; School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou, 510275, China
Recommended Citation:
Dong S.,Li J.,Cawood P.A.,et al. Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling[J]. Earth and Planetary Science Letters,2020-01-01,544