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

• Published in: Tectonophysics Vol. 606; pp. 48 - 59
• Main Authors: Shi, Danian, Lu, Qingtian, Xu, Wenyi, Yan, Jiayong, Zhao, Jinhua, Dong, Shuwen, Chang, Yinfo
• Format: Journal Article
• Language: English
• Published: 23.10.2013
• Subjects: Arrays; Belts; Crusts; Magma; Melts; Receivers; Rocks; Upwelling
• ISSN: 0040-1951
• DOI: 10.1016/j.tecto.2013.01.012

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. 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.