Late Paleozoic magmatism in South China

Oceanic subduction or intracontinental orogeny?

Jin Hai Yu, Qian Liu, Xiu Mian Hu, Qin Wang, Suzanne Y. O'Reilly

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A gneissic granite with an U-Pb age of 313±4 Ma was found in northeastern Fujian Province, South China. It is an S-type granite characterized by high K2O, Al2O3 and low SiO2, Na2O contents with high A/CNK ratio of 1. 22 for the whole rock. Zircons with stubby morphology from the gneissic granite yield 206Pb/238U ages ranging from 326 to 301 Ma with a weighted average age of 313±4 Ma, and negative e{open}Hf(t) values from -8. 35 to -1. 74 with Hf model ages (TC DM) of 1. 43 to 1. 84 Ga. This S-type granite probably originated from late Paleoproterozoic crust in intracontinental orogeny. Integrated with previous results on paleogeographic reconstruction of South China, the nature of Paleozoic basins, Early Permian volcanism and U-Pb-Hf isotope of detrital zircons from the late Paleozoic to early Mesozoic sedimentary rocks, we suggest the occurrence of a late Paleozoic orogeny in the eastern Cathaysia Block, South China. This orogenic cycle includes Late Carboniferous (340-310 Ma) orogeny (compression) episode and Early Permian (287-270 Ma) post-orogenic or intraplate extension episode. Therefore, the late Paleozoic magmatism in the southeastern South China probably occurred during the intraplate orogeny rather than the arc-related process.

Original languageEnglish
Pages (from-to)788-795
Number of pages8
JournalChinese Science Bulletin
Volume58
Issue number7
DOIs
Publication statusPublished - 2013

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