Geochemistry, zircon U-Pb age and Hf isotopic constraints on the petrogenesis of the Silurian rhyolites in the Loei fold belt and their tectonic implications

Tianyu Zhao; Xin Qian; Qinglai Feng

doi:10.1007/s12583-016-0671-y

Volume 27 Issue 3

Jun 2016

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Journal of Earth Science > 2016 > 27(3): 391-402.

Tianyu Zhao, Xin Qian, Qinglai Feng. Geochemistry, zircon U-Pb age and Hf isotopic constraints on the petrogenesis of the Silurian rhyolites in the Loei fold belt and their tectonic implications. Journal of Earth Science, 2016, 27(3): 391-402. doi: 10.1007/s12583-016-0671-y

Citation:

Tianyu Zhao, Xin Qian, Qinglai Feng. Geochemistry, zircon U-Pb age and Hf isotopic constraints on the petrogenesis of the Silurian rhyolites in the Loei fold belt and their tectonic implications. Journal of Earth Science, 2016, 27(3): 391-402. doi: 10.1007/s12583-016-0671-y

Citation:

Tianyu Zhao, Xin Qian, Qinglai Feng. Geochemistry, zircon U-Pb age and Hf isotopic constraints on the petrogenesis of the Silurian rhyolites in the Loei fold belt and their tectonic implications. Journal of Earth Science, 2016, 27(3): 391-402. doi: 10.1007/s12583-016-0671-y

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Geochemistry, zircon U-Pb age and Hf isotopic constraints on the petrogenesis of the Silurian rhyolites in the Loei fold belt and their tectonic implications

doi: 10.1007/s12583-016-0671-y

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China; School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

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Corresponding author: Qinglai Feng, qinglaifeng@cug.edu.cn
Received Date: 11 Jun 2015
Accepted Date: 12 Dec 2016
Publish Date: 10 Jun 2016

Abstract

Abstract

Zircon U-Pb dating, Lu-Hf isotopic and geochemical data for the Silurian rhyolites from the Loei fold belt are presented to constrain their petrogenesis and tectonic settings. The rhyolites give a weighted mean ²⁰⁶Pb/²³⁸U age of 423.7±2.7 Ma, and are characterized by high SiO₂, Al₂O₃, K₂O and low MnO, MgO and P₂O₅. All samples are enriched in LILEs (e.g., Ba, K, Pb) and LREEs and depleted in HFSEs (e.g., Nb, Ta, Ti) with obvious negative Eu-anomalies (dEu=0.56-0.63). The calc-alkaline rhyolites are typical arc-related rocks. The Loei rhyolites have high A/CNK ratios (1.19-1.34) and positive ε_Hf(t) (4.03-5.38), which can be interpreted as partial melting of juvenile crustal materials followed by multistage melting and differentiation, similar to highly fractional I-type rocks. Combined with regional geological surveys, the Loei rhyolites should be formed in a volcanic arc environment and may be in contact with the Truong Son fold belt during the Early Paleozoic. Moreover, the Simao Block might be in contiguity with the Indochina Block during Silurian.
- I-type rhyolite,
- zircon U-Pb dating,
- Hf isotopic composition,
- geochemical characteristics,
- Loei fold belt,
- Indochina Block

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References(63)

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