气候变化领域集成服务门户(CCPortal): Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling

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DOI	10.1016/j.epsl.2020.116360
	Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling
	Dong S.; Li J.; Cawood P.A.; Gao R.; Zhang Y.; Xin Y.
发表日期	2020
ISSN	0012821X
卷号	544
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202565
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
推荐引用方式 GB/T 7714	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],2020,544.
APA	Dong S.,Li J.,Cawood P.A.,Gao R.,Zhang Y.,&Xin Y..(2020).Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling.Earth and Planetary Science Letters,544.
MLA	Dong S.,et al."Mantle influx compensates crustal thinning beneath the Cathaysia Block, South China: Evidence from SINOPROBE reflection profiling".Earth and Planetary Science Letters 544(2020).