U–Pb zircon age, geochemical and isotopic characteristics of the Miaoya syenite and carbonatite complex, central China

Geological Journal - Tập 52 Số 6 - Trang 938-954 - 2017
Jiang Zhu1,2, Lian‐Xun Wang3, Sanguo Peng1,2, Lianhong Peng1,2, Chang-Xiong Wu4, Xiaofei Qiu1,2
1Research Center of Granitic Diagenesis and Mineralization China Geological Survey Wuhan Hubei China
2Wuhan Center China Geological Survey Wuhan Hubei China
3School of Earth Sciences China University of Geosciences Wuhan Hubei China
4Sixth Geological Brigade Hubei Geological Bureau Xiaogan Hubei China

Tóm tắt

The Miaoya syenite and carbonatite complex is located in the southern margin of the South Qinling belt, central China. LA‐ICP‐MS zircon U–Pb dating reveals that the syenite and carbonatite have crystallization ages of 445.2 ± 2.6 Ma (MSWD = 0.66) and 434.3 ± 3.2 Ma (MSWD = 1.08), respectively. Both syenite and carbonatite display low ISr values (0.7004 to 0.7053) and depleted εNd(t) values of +1.1 to +5.5, with one‐stage Nd model ages of 0.65 to 0.94 Ga. Their zircon εHf(t) values are also similarly positive (+3.1 to +8.9), and one‐stage Hf model ages range from 0.71 to 0.92 Ga. Whole‐rock geochemistry suggests that the syenite belongs to the shoshonitic series and both syenite and carbonatite show identical REE and trace element patterns. The coeval intrusive ages, similar geochemical and Sr–Nd–Hf isotopic compositions suggest that the Miaoya carbonatite and associated syenite are genetically related to each other. We consider that the carbonatite could be a final product by protracted fractionation of a CO2‐rich alkaline melt. The depleted εNd(t) and zircon εHf(t) isotopes also indicate that the associated syenite and carbonatite could be originated from a mantle‐derived magma. The sources are likely composed of dominated HIMU mantle and minor EMI mantle. We propose that the Silurian Miaoya Complex was formed in the extensional rifting setting, associated with the mantle upwelling. Copyright © 2016 John Wiley & Sons, Ltd.

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Geological Journal

Tập 52 Số 6

938-954

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