Geochemistry, Sr-Nd-Pb Isotopic Compositions and Zircon U-Pb Geochronology of Neoproterozoic Mafic Dyke in the Douling Complex, South Qinling Belt, China

Tong Li; Liang Liu; Xiao-Ying Liao; Yong-Sheng Gai; Tuo Ma; Chao Wang

doi:10.1007/s12583-020-1298-6

Volume 31 Issue 2

Apr 2020

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Journal of Earth Science > 2020 > 31(2): 237-248.

Tong Li, Liang Liu, Xiao-Ying Liao, Yong-Sheng Gai, Tuo Ma, Chao Wang. Geochemistry, Sr-Nd-Pb Isotopic Compositions and Zircon U-Pb Geochronology of Neoproterozoic Mafic Dyke in the Douling Complex, South Qinling Belt, China. Journal of Earth Science, 2020, 31(2): 237-248. doi: 10.1007/s12583-020-1298-6

Citation:

Tong Li, Liang Liu, Xiao-Ying Liao, Yong-Sheng Gai, Tuo Ma, Chao Wang. Geochemistry, Sr-Nd-Pb Isotopic Compositions and Zircon U-Pb Geochronology of Neoproterozoic Mafic Dyke in the Douling Complex, South Qinling Belt, China. Journal of Earth Science, 2020, 31(2): 237-248. doi: 10.1007/s12583-020-1298-6

Citation:

Tong Li, Liang Liu, Xiao-Ying Liao, Yong-Sheng Gai, Tuo Ma, Chao Wang. Geochemistry, Sr-Nd-Pb Isotopic Compositions and Zircon U-Pb Geochronology of Neoproterozoic Mafic Dyke in the Douling Complex, South Qinling Belt, China. Journal of Earth Science, 2020, 31(2): 237-248. doi: 10.1007/s12583-020-1298-6

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Geochemistry, Sr-Nd-Pb Isotopic Compositions and Zircon U-Pb Geochronology of Neoproterozoic Mafic Dyke in the Douling Complex, South Qinling Belt, China

doi: 10.1007/s12583-020-1298-6

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

More Information

Author Bio:
Tong Li
Corresponding author: Liang Liu
Received Date: 25 May 2019
Accepted Date: 06 Jan 2020
Publish Date: 01 Apr 2020

Abstract

Abstract

Mafic dyke swarm is widely developed in Proterozoic continental lithosphere. The Gangou diabase dyke from the Xixia area, intruded into the Douling complex of the South Qinling belt, yields zircon U-Pb age of 731 Ma. It has low SiO₂ content (49.02 wt.%-49.37 wt.%) and Mg^# (34.0-37.7) and shows characteristics of subalkaline tholeiite series. They show high ΣREE (155.5×10^-6-184.7×10^-6), weak negative Eu anomaly (δEu=0.88-0.93), slight depletion of Nb and Ta, and enrichment of LILE. Their major and trace element, Sr-Nd-Pb isotope and clinopyroxene compositions indicate that it originated from the partial melting of the asthenospheric mantle within-plate extension setting and was slightly contaminated by crust compositions. The similarities of formation age, petrogenesis, source characteristic and tectonic setting for Gangou diabase with mafic dykes in Wudang Block and mafic volcanic rocks in Yaolinghe Group indicate that the South Qinling belt underwent strong continental extension in Neoproterozoic during 796-685 Ma most likely correspondence to the breaking-up of the Rodinia supercontinent.
- Douling complex,
- diabase dyke,
- LA-ICP-MS zircon U-Pb dating,
- Sr-Nd-Pb isotope,
- Rodinia supercontinent break-up

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References(99)

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