| 越南西北部Phan Si Pan地区Ngoi Chi岩组的锆石U-Pb年龄和Hf同位素组成 |
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| 关键词:Vietnam Phan Si Pan U-Pb zircon Hf isotope composition basement rock |
| 基金项目:Vietnam National University-Ho Chi Minh City (VNU-HCM) (No. C2014-18-02) |
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| The Ngoi Chi Formation in the Phan Si Pan Area of Northwest Vietnam Revealed by Zircon U-Pb Age and Hf Isotope Composition |
| This paper reports the result of an integrated study of zircon U-Pb age and Hf isotope composition for a gneiss sample (Ngoi Chi formation) from the Phan Si Pan area in northwest Vietnam. CL imaging reveals that most zircons are magmatic, with a few of them exhibiting thin metamorphic rims. The magmatic zircons gave a weighted mean U-Pb age of ~2.9 Ga, indicating the gneiss is the basement rock in the Phan Si Pan area. They have εHf(t) value of –4.70±0.92, and two-stage Hf model age of ~3.5 Ga, indicating that the gneiss was derived from partial melting of >3.5 Ga crustal rock. The metamorphic rims yielded an age of ~1.8 Ga, implying that the metamorphic event occurred in the Neoarchean era, which might have been also a major tectono-thermal event in the Phan Si Pan area. |
| HIEU Pham Trung.2015.The Ngoi Chi Formation in the Phan Si Pan Area of Northwest Vietnam Revealed by Zircon U-Pb Age and Hf Isotope Composition[J].Acta Geoscientica Sinica,36(6):755-760. |
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