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- W4212786346 abstract "A Paleozoic gabbro–diabase–granite association in the Shangdan suture zone (SDSZ) has been studied for zircon U–Pb ages, whole-rock geochemistry, and Sr-Nd isotopic compositions to constrain their petrogenesis and reveal tectonic implications. These rocks have distinctive crystallization ages: the Guchenggou gabbro yield zircon U–Pb ages of 423 to 424 Ma; the average age of Yueritan diabase is 411 Ma; and the Danfeng granites yield zircon U–Pb ages of 411 to 414 Ma. The Guchenggou gabbro was formed by partial melting of phlogopite-bearing garnet lherzolite modified by subduction fluid in a continental arc setting. The Yueritan diabase was generated by mixing phlogopite-bearing garnet lherzolite modified by subduction melt and continental crust in a post-collision setting. The Danfeng granites are weakly peraluminous I-type, formed by mixing juvenile crust and metagreywacks under high temperature and high pressure in a tectonic transition environment from compression to extension. We suggest that the subduction of the Shangdan Ocean induces the formation of gabbro. Meanwhile, the diabases and granites are related to the continental crustal relamination in response to the collision of North Qinling Belt (NQB) and South Qinling Belt (SQB), suggesting that the closure of the Shangdan Ocean may have occurred in ca. 410 Ma." @default.
- W4212786346 created "2022-02-24" @default.
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- W4212786346 date "2022-03-22" @default.
- W4212786346 modified "2023-10-14" @default.
- W4212786346 title "Zircon U–Pb dating and geochemistry of intrusive rocks in the Shangdan suture zone of the Qinling Orogenic Belt: petrogenesis and tectonic implications" @default.
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- W4212786346 doi "https://doi.org/10.1144/jgs2021-157" @default.
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