Crustal structure beneath the middle-lower Yangtze metallogenic belt in;East China: Constraints from passive source seismic experiment on the;Mesozoic intra-continental mineralization

doi:10.1016/j.tecto.2013.01.012

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	Crustal structure beneath the middle-lower Yangtze metallogenic belt in;East China: Constraints from passive source seismic experiment on the;Mesozoic intra-continental mineralization
	Shi, Danian 4; Lu, Qingtian ; Xu, Wenyi ; Yan, Jiayong ; Zhao, Jinhua ; Dong, Shuwen 1; Chang, Yinfo 2; CA SinoProbe-03-02 Team
刊名	TECTONOPHYSICS
	2013
卷号	606;SI SI 页码:48-59
关键词	Middle-lower Yangtze metallogenic belt Broadband seismic experiment Receiver function profiling Seismic anisotropy Crustal and upper mantle structure Mineralization
ISSN号	0040-1951;EI 1879-3266
DOI	10.1016/j.tecto.2013.01.012
英文摘要	To understand the formation and the tectonic process of the Mesozoic middle-lower Yangtze metallogenic belt (YMB), the SinoProbe program deployed a quasi-linear passive source seismic array across the belt. We performed receiver function profiling and measurement of shear-wave splitting parameters with the collected data. Our results show that the Moho depth varies significantly along the profile and that a "mantle uplift" exists right beneath the YMB. We also found that the lower crust of the YMB is different from that of its adjacent areas in structure on the receiver function profile. It possesses seismic anisotropy with direction roughly parallel to the belt. Our SKS/SKKS shear-wave splitting results also show similar belt-parallel azimuthal anisotropy right beneath the YMB. We interpret the seismic anisotropy in the lower crust of the YMB as the result of mineral crystal alignment caused by melting and belt-parallel flow in the Mesozoic ore-forming process. Besides, we observed a nearly south-dipping converter extending from shallow to lower crust beneath the Hefei Basin, which most possibly resulted from the Mesozoic crustal extension. We interpret the "mantle uplift" and the crustal extensional structures to be consequences of asthenospheric upwelling during the Mesozoic ore-forming process. Our results suggest that the lower crust of the YMB was most likely one part of the multi-level metallogenic magma system in the Mesozoic magmatism and mineralization processes, and the formation of the metallogenic belt to be a result much similar to the MASH (Melting, Assimilation, Storage and Homogenization; cf. Hildreth and Moorbath, 1988; Richards, 2003) process. First, the asthenospheric upwelling resulted in a crustal extensional environment; then the melts from the upwelling asthenosphere intruded into the lower crust of the YMB, and assimilation occurred when they mixed with in situ lower crustal materials, which led to the formation of adakitic-like magma; the adakitic-like magma rose up along extensional structures, and reacted with country rocks to form mineral deposits. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	矿床地质
WOS关键词	S-RECEIVER FUNCTIONS ; LATTICE PREFERRED ORIENTATION ; UPPER-MANTLE ; BENEATH ; ADAKITE-LIKE ROCKS ; SOUTH CHINA ; PALEOMAGNETIC CONSTRAINTS ; AZIMUTHAL ANISOTROPY ; SOUTHEASTERN CHINA ; CONTINENTAL-CRUST ; PLATE ; SUBDUCTION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000326420900005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40036]
专题	中国地质科学院矿产资源研究所
作者单位	1.CAGS, Inst Mineral Resources, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 3.Geol Survey Anhui Prov, Hefei 230001, Peoples R China. 4.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Shi, Danian,Lu, Qingtian,Xu, Wenyi,et al. Crustal structure beneath the middle-lower Yangtze metallogenic belt in;East China: Constraints from passive source seismic experiment on the;Mesozoic intra-continental mineralization[J]. TECTONOPHYSICS,2013,606;SI SI:48-59.
APA	Shi, Danian.,Lu, Qingtian.,Xu, Wenyi.,Yan, Jiayong.,Zhao, Jinhua.,...&CA SinoProbe-03-02 Team.(2013).Crustal structure beneath the middle-lower Yangtze metallogenic belt in;East China: Constraints from passive source seismic experiment on the;Mesozoic intra-continental mineralization.TECTONOPHYSICS,606;SI SI,48-59.
MLA	Shi, Danian,et al."Crustal structure beneath the middle-lower Yangtze metallogenic belt in;East China: Constraints from passive source seismic experiment on the;Mesozoic intra-continental mineralization".TECTONOPHYSICS 606;SI SI(2013):48-59.