Petrogenesis and tectonic implications of the Kwangsian orogen: Constrains from geochemical and Sr–Nd–Hf isotopic compositions of the early Paleozoic peraluminous granites and coexisting rocks in Northern Guangdong, SE China

1.China Geological Survey, Wuhan Center of Geological Survey;2.aChina Geological Survey, Wuhan Center of Geological Survey

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    This paper presents whole–rock major and trace elemental and Sr–Nd–Hf isotopic compositions, and zircon U–Pb geochronological data of the peraluminous granitic intrusion and coexisting granitiod rocks in the northern Guangdong province, South China, in order to investigate their source composition, petrogenesis and tectonic implications. The Qingzhou granodiorites are weakly to strongly peraluminous, with A/CNK values of 1.05–1.96. They have relatively high initial 87Sr/86Sr ratios (ISr= 0.7087– 0.7148), low εNd(t) values (-11.2 to -10.1), and varied zircon εHf(t) values of -13.4 to +4.81. By contrast, the Damaoshan granodiorites are metaluminous (A/CNK= 0.79– 0.94) in composition, with ISr values of 0.7083 to 0.7110, εNd(t) values of -7.92 to -5.28 and zircon εHf(t) values of -8.69 to -2.06. The Gaoshou quartz diorites are metaluminous–peraluminous with A/CNK of 0.87– 1.24. Their ISr values rang from 0.7104 to 0.7111 and εNd(t) values from -9.64 to -8.63. Geochemical data and Sr–Nd–Hf isotope compositions indicate that the Qingzhou, Damaoshan and Gaoshou intrusions are mainly derived from partial melting of metagreywackes, tonalitic rocks and amphibolites, respectively. Combined with the previous studies, these prealuminous granites formed in syn–orogen compression environment. In this paper, we test to provide a new way of thinking for the petrogenesis of the early Paleozoic granites in South China Block, and the regional crust restructure. A broader vision and more geological evidences are required to reveal the triggering factor of the Kwangsian orogen.

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  • Received:January 15,2021
  • Revised:April 28,2021
  • Adopted:May 04,2021
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