The Crustal and Uppermost Mantle Vs Structure of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt: Implications for Metallogenic Process

Zhang，Yongqian1,2; Qingtian，L.1,2; Shi，Danian1,2; Yang，Yingjie3,4; Afonso，Juan Carlos3,5; Xu，Yao1,2; Yan，Jiayong1,2; Gong，Xuejing1,2; Xu，Tao6

2023-08-01

10.1029/2023JB026817

Journal of Geophysical Research: Solid Earth   Impact Factor & Quartile

2169-9313

2169-9356

The Middle and Lower Reaches of the Yangtze River metallogenic belt (MLYMB) is one of the most important Fe-Cu polymetallic belts in China. However, the mechanism and deep geodynamical process for the formation of this belt are still controversial. Here, we obtain the crustal and the uppermost mantle structures using ambient noise data from a dense seismic profile. A low velocity zone is revealed beneath the Moho of MLYMB, interpreted as the source of the deep mineralization materials. In addition, a low velocity layer (LVL) and a high velocity layer (HVL) are observed in the crust of the southern segment of the profile. The LVL is interpreted as a tectonic detachment layer between the upper and the lower crust, and the HVL is interpreted as the aggregation zone for mineralizing melts or crystallized magma chambers. Based on the observed velocity features, we propose a three-stage model for the formation of ore deposits in MLYMB. Our model suggests that an upwelling of asthenosphere triggered by the delamination of a previously thickened lithosphere leads to the partial melting of upper mantle rocks, which eventually ponders under the Moho. The magma then infiltrates through the ductile lower crust and reaches a depth of ∼7–13 km, forming a minerals-enriched magma chamber. Minerals-rich hot fluids originating from the magma chamber continue to move upward along the pre-existent faults and the minerals finally precipitate in dense veinlets when reaching shallow depths, forming the ore deposits in and around the MLYMB.

ambient noise tomography metallogenic belt metallogenic model middle and lower reaches of the Yangtze River shear wave velocity

SCI

English

NI Journal Papers

Corresponding

National Key Research and Development Program of China[2016YFC0600201];National Natural Science Foundation of China[41574082];National Natural Science Foundation of China[42074069];National Natural Science Foundation of China[42074099];China Geological Survey[DD20190012];China Geological Survey[DD20221643];

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001042083600001

AMER GEOPHYSICAL UNION

GEOSCIENCES

2-s2.0-85166749337

Scopus

1.Chinese Academy of Geological Sciences,Beijing,China
2.China Deep Exploration Center—SinoProbe Center,China Geological Survey & Chinese Academy of Geological Sciences,Beijing,China
3.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
4.Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen,China
5.Faculty of Geo-Information Science and Earth Observation (ITC),University of Twente,Enschede,Netherlands
6.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China

Zhang，Yongqian,Qingtian，L.,Shi，Danian,et al. The Crustal and Uppermost Mantle Vs Structure of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt: Implications for Metallogenic Process[J]. Journal of Geophysical Research: Solid Earth,2023,128(8).

Zhang，Yongqian.,Qingtian，L..,Shi，Danian.,Yang，Yingjie.,Afonso，Juan Carlos.,...&Xu，Tao.(2023).The Crustal and Uppermost Mantle Vs Structure of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt: Implications for Metallogenic Process.Journal of Geophysical Research: Solid Earth,128(8).

Zhang，Yongqian,et al."The Crustal and Uppermost Mantle Vs Structure of the Middle and Lower Reaches of the Yangtze River Metallogenic Belt: Implications for Metallogenic Process".Journal of Geophysical Research: Solid Earth 128.8(2023).