Reflection seismic imaging of the Lujiang-Zongyang volcanic basin,;Yangtze Metallogenic Belt: An insight into the crustal structure and;geodynamics of an ore district

doi:10.1016/j.tecto.2013.04.006

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

	Reflection seismic imaging of the Lujiang-Zongyang volcanic basin,;Yangtze Metallogenic Belt: An insight into the crustal structure and;geodynamics of an ore district
	Lu, Qingtian 5; Yan, Jiayong ; Shi, Danian ; Dong, Shuwen 1; Tang, Jingtian 2; Wu, Mingan 3; Chang, Yinfo 3
刊名	TECTONOPHYSICS
	2013
卷号	606;SI SI 页码:60-77
关键词	Reflection seismic Crustal structure Geodynamics Ore district Lujiang-Zongyang Yangtze metallogenic belt
ISSN号	0040-1951;EI 1879-3266
DOI	10.1016/j.tecto.2013.04.006
英文摘要	Five intersecting reflection seismic profiles were shot over the Lu-Zong volcanic basin, one of the seven ore districts in the middle and lower Yangtze River Metallogenic Belt in east China. The seismic data reveal diversified reflective patterns in the upper crust, which are interpreted as horsts and grabens in general. The middle crust presents both thrust related structures and boudinage and pinch-and-well structure on different profiles, suggesting a strong structural heterogeneity, which developed due to a change from compressional to extensional movement. Below the central part of a volcanic basin, the lower crust shows an obvious reflective anisotropy both at the crust-mantle and the brittle-ductile transition in the crust. This feature may be explained by magma system emplaced along a NE-trending fault or weak zone at different depths. The Tan-Lu fault zone is present as a northwest-dipping fault extending to the middle crust. The lower crust beneath the Tan-Lu fault and peripheries is possibly of Dabie affinities. The Lu-Zong volcanic basin is clearly defined as an asymmetric graben with master faults on both the east and north flanks. A contrasting reflection character suggests a division of the basin into northern and southern parts separated by a concealed fault. The relatively thin volcanic sequences, inferred to be 800-1000 m in thickness, cover Triassic and Paleozoic sequences at depth, that provide an exploration target in the northern part for deep porphyry and skarn deposits. The dominant deformation reflects NW-SE-oriented compression and extension formed during the Yanshanian orogenic episode. The contraction deformation is characterized by thrust faults with imbrication of crustal slices, whereas the extension deformation is featured by normal faults, regional detachments and basins. Underplating of mantle-derived magma and a multi-layer magma intrusion model are proposed to explain both seismic features and the NE-striking Lu-Zong volcanism and igneous intrusions in the region. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	固体地球物理学
WOS关键词	LU FAULT ZONE ; SOUTH CHINA ; EASTERN CHINA ; TAN-LU ; WESTERN-AUSTRALIA ; YILGARN CRATON ; IGNEOUS ROCKS ; MODEL ; INTRUSION ; DEPOSITS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000326420900006
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40019]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 3.Cent S Univ, Sch Geosci & Infophys, Changsha 410083, Peoples R China. 4.Anhui Geol Survey, Hefei 230088, Peoples R China. 5.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Lu, Qingtian,Yan, Jiayong,Shi, Danian,et al. Reflection seismic imaging of the Lujiang-Zongyang volcanic basin,;Yangtze Metallogenic Belt: An insight into the crustal structure and;geodynamics of an ore district[J]. TECTONOPHYSICS,2013,606;SI SI:60-77.
APA	Lu, Qingtian.,Yan, Jiayong.,Shi, Danian.,Dong, Shuwen.,Tang, Jingtian.,...&Chang, Yinfo.(2013).Reflection seismic imaging of the Lujiang-Zongyang volcanic basin,;Yangtze Metallogenic Belt: An insight into the crustal structure and;geodynamics of an ore district.TECTONOPHYSICS,606;SI SI,60-77.
MLA	Lu, Qingtian,et al."Reflection seismic imaging of the Lujiang-Zongyang volcanic basin,;Yangtze Metallogenic Belt: An insight into the crustal structure and;geodynamics of an ore district".TECTONOPHYSICS 606;SI SI(2013):60-77.