Zircon U-Pb Geochronology, Hf Isotopic Composition of the Hongfengdui Granitic Intrusion in Jiamao Area of Hainan Island and Its Tectonic Setting Implications
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摘要: 本文在野外地质调查的基础上，对海南加茂地区红峰队细中粒黑云母正长花岗岩体进行锆石年代学、Hf同位素及地球化学等特征的深入研究，以揭示该岩体形成的构造环境。结果显示，红峰队花岗岩体锆石LA-ICP-MS U-Pb年龄为259.5±1.3 Ma，形成于晚二叠世；具有高硅（SiO2=72.26%～75.69%）、富碱（K2O+Na2O=8.51%～9.18%），高钾（K2O/Na2O=1.13～1.7），贫CaO（0.38%～0.75%）和P2O5（0.01%～0.02%）等地球化学特征，A/CNK值为0.99～1.08，属于准铝质-弱过铝质花岗岩；富集Rb、Th、U、K、Pb、Nd、Zr、Hf、Sm和轻稀土，明显亏损Ba、Nb、Ta、Sr、P、Eu、Ti，具强烈的负Eu异常；锆石饱和温度也较低（767～796℃）；显示该岩体属于高分异I型花岗岩；εHf(t)值变化较小（+3.0 ~ +7.3），反映了其岩浆来源较为均一。红峰队岩体来源于新生地壳的部分熔融，并且发生了较高程度的分离结晶，可能形成于华南与印支块体的碰撞后伸展环境。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
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Key words:
- zircon U- Pb dating /
- Hf isotope /
- geochemistry /
- the Hongfengdui granite /
- Hainan Island
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