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Zircon Geochronology of Granodiorite Porphyry in Yaojialing Mine, Anhui Province, and its Geological Implications

Shao Feng Liu, Yang Song Du, Yi Cao, Zhen Shan Pang

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Abstract

This study reports the petrological characteristics and zircon geochronology based on laser ablation ICP mass spectrometry. Zircons extracted from granodiorite porphyry display oscillatory zoning that suggests magmatic crystallization with the ratios of Th/U (0.34~1.20). The zircons yield early cretaceous 206Pb/238U age of (141.0±1.7) Ma that constrains the approximate timing of formation of the granodiorite porphyry. Inherited zircons yield 206Pb/238U age of (490±24) Ma and (556±27) Ma, and 207Pb/206Pb age of (2444±21) Ma implying that the granodiorite porphyry was sourced from middle and lower crust possibly.

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What this paper is about

This study reports the petrological characteristics and zircon geochronology based on laser ablation ICP mass spectrometry. Zircons extracted from granodiorite porphyry display oscillatory zoning that suggests magmatic crystallization with the ratios of Th/U (0.34~1.20). The zircons yield early cretaceous 206Pb/238U age of (141.0±1.7) Ma that constrains the approximate timing of formation of the granodiorite porphyry. Inherited zircons yield 206Pb/238U age of (490±24) Ma and (556±27) Ma, and 207Pb/206Pb age of (2444±21) Ma implying that the granodiorite porphyry was sourced from middle and lower crust possibly.

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Available abstract

This study reports the petrological characteristics and zircon geochronology based on laser ablation ICP mass spectrometry. Zircons extracted from granodiorite porphyry display oscillatory zoning that suggests magmatic crystallization with the ratios of Th/U (0.34~1.20). The zircons yield early cretaceous 206Pb/238U age of (141.0±1.7) Ma that constrains the approximate timing of formation of the granodiorite porphyry. Inherited zircons yield 206Pb/238U age of (490±24) Ma and (556±27) Ma, and 207Pb/206Pb age of (2444±21) Ma implying that the granodiorite porphyry was sourced from middle and lower crust possibly.

Key concepts: Zircon, Geochronology, Geology, Geochemistry, Cretaceous, Crust, Petrology, Paleontology

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Zircon Geochronology of Granodiorite Porphyry in Yaojialing Mine, Anhui Province, and its Geological Implications — Research Paper | ScholarLens