Zircon U-Pb Geochronology, Hf Isotopic Composition of the Hongfengdui Granitic Intrusion in Jiamao Area of Hainan Island and Its Tectonic Setting Implications

HUZai-Long; CHENJie; HUANGWu-Xuan; WEIChang-Xin; WANGChao; LYUZhao-Ying

doi:10.3969/j.issn.2097-0013.2022.03.011

2022 Vol. 38, No. 3

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HUZai-Long, CHENJie, HUANGWu-Xuan, WEIChang-Xin, WANGChao, LYUZhao-Ying. 2022. Zircon U-Pb Geochronology, Hf Isotopic Composition of the Hongfengdui Granitic Intrusion in Jiamao Area of Hainan Island and Its Tectonic Setting Implications. South China Geology, 38(3): 496-507. doi: 10.3969/j.issn.2097-0013.2022.03.011

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HUZai-Long, CHENJie, HUANGWu-Xuan, WEIChang-Xin, WANGChao, LYUZhao-Ying. 2022. Zircon U-Pb Geochronology, Hf Isotopic Composition of the Hongfengdui Granitic Intrusion in Jiamao Area of Hainan Island and Its Tectonic Setting Implications. South China Geology, 38(3): 496-507. doi: 10.3969/j.issn.2097-0013.2022.03.011

Zircon U-Pb Geochronology, Hf Isotopic Composition of the Hongfengdui Granitic Intrusion in Jiamao Area of Hainan Island and Its Tectonic Setting Implications

1. Hainan Key Laboratory of Marine Geological Resources and Environment, Haikou 570206, Hainan, China
2. Hainan Geological Survey Institute, Haikou 570206, Hainan, China
3. Hainan Geological Survey & Design Institute, Haikou 570206, Hainan, China

Received Date: 28 May 2021

Revised Date: 26 September 2021

Abstract

Abstract

A large number of intrusive rocks are distributed in the Jiamao area of Hainan Island. Limited by the degree of research, the predecessors have changed the formation age of the Hongfengdui granitic intrusion mass many times. This article in-depth study zircon chronology, Hf isotopes and geochemistry of the Hongfengdui granitic intrusion on the basis of field geological surveys in order to reveal the tectonic setting of the Hongfengdui granitic formation.The results show that the LA-ICP-MS zircon U-Pb age is 259.5±1.3Ma, with high Si (SiO2=72.26-75.69 wt%), rich alkali (K2O+Na2O=8.51-9.18 wt%), high K(K2O/Na2O=1.13～1.7), low CaO（0.38%～0.75%）and P2O5（0.01%～0.02%）, belonging to the subalkaline high-K calc-alkaline series. While the A/CNK value is 0.99～1.08, belonging to quasi-aluminous to weakly peraluminous granite. On trace and REE aspects, the rocks are enriched in Rb, Th, U, K, Pb, Nd, Zr, Hf, Sm and LREE, obviously depleted in Ba,Nb,Ta,Sr,P,Eu and Ti with strong negative Eu anomaly and lower zircon saturation temperatures（767～796℃）. Integrated geological and geochemical data suggest that Hongfengdui granitic should be genetically ascribed to highly fractionated I-type granites. Zircon Hf isotopic compositions of the granites are lowly variable with εHf(t) values ranging from +3.0 to +7.3, showing that magma source is relatively uniform. Geochemical characteristics indicate that the Hongfengdui granitic was generated from partial melting of mafic crust, and a high degree of fractionation occurred during the magma’s evolution, the granitic intrusion may be formed in the collision of the South China and Indosinian blocks and belonged to the post-collision tectonic environment, combined with other Late Permian granite features in the region, which proposes the boundary between the tectonic setting of extrusion and the tectonic setting of extension is probably to be accurate to about 259Ma about Hercynian-Indosinian magmatic activity
- zircon U- Pb dating /
- Hf isotope /
- geochemistry /
- the Hongfengdui granite /
- Hainan Island

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