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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

Tianyu Zhao Xin Qian Qinglai Feng

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[J]. Journal of Earth Science, 2016, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y
引用本文: 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[J]. Journal of Earth Science, 2016, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y
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, 18(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, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y

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

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

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出版历程
  • 收稿日期:  2016-06-12
  • 修回日期:  2016-06-12
  • 刊出日期:  2016-06-12

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

摘要: 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 206 Pb/ 238 U age of 423.7±2.7 Ma, and are characterized by high SiO 2 , Al 2 O 3 , K 2 O and low MnO, MgO and P 2 O 5 . 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 (δEu=0.56–0.63). The calc-alkaline rhyo- lites 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 region- al 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.

English Abstract

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[J]. Journal of Earth Science, 2016, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y
引用本文: 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[J]. Journal of Earth Science, 2016, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y
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, 18(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, 18(3): 391-402. doi: 10.1007/s12583-016-0671-y

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