Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen

Shengxin Liu; Haijin Xu

doi:10.1007/s12583-019-0892-y

Volume 30 Issue 3

Jun 2019

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Journal of Earth Science > 2019 > 30(3): 636-646.

Shengxin Liu, Haijin Xu. Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen. Journal of Earth Science, 2019, 30(3): 636-646. doi: 10.1007/s12583-019-0892-y

Citation:

Shengxin Liu, Haijin Xu. Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen. Journal of Earth Science, 2019, 30(3): 636-646. doi: 10.1007/s12583-019-0892-y

Citation:

Shengxin Liu, Haijin Xu. Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen. Journal of Earth Science, 2019, 30(3): 636-646. doi: 10.1007/s12583-019-0892-y

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Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen

doi: 10.1007/s12583-019-0892-y

Shengxin Liu,
Haijin Xu^,

School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Funds:

the National Natural Science Foundation of China 41772054

the National Natural Science Foundation of China 41372076

the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) CUGQYZX1704

the National Natural Science Foundation of China 41572039

More Information

Corresponding author: Haijin Xu
Received Date: 21 Oct 2018
Accepted Date: 20 Dec 2018
Publish Date: 01 Jun 2019

Abstract

Abstract

Syn-collapse magmatism is a critical issue for evolution of the continental orogen. The Dabie Orogen is a typical orogen which was suffered from a complete collapse. Two kinds of granitoids, namely, the coarse-grained diorite and the fine-grained granite, are recognized at the center of the Luotian extensional dome, providing an opportunity to decipher the syn-collapse magmatism in the Dabie Orogen. The diorites (125±3 Ma) are high K calc-alkaline rocks, with low SiO₂ (51.9 wt.%-56.6 wt.%) and high MgO (3.5 wt.%-4.0 wt.%) contents. They are enriched in LREE and LILEs (e.g., Ba, K, Rb) and depleted in HFSEs (e.g., Ta, Nb, and Hf) with low ratio of Sr/Y (30.82-46.89). The granites (118±2 Ma) are shoshonite series rocks, with relatively high SiO₂ (68.9 wt.%-72.6 wt.%) and low MgO (0.32 wt.%-0.66 wt.%) contents. They are also enriched in LREE and LILEs with weakly negative Eu anomalies (δEu=0.81-0.85), and are depleted in HFSEs with low Sr contents (338 ppm-477 ppm) and Sr/Y ratios (23.80-33.13). Therefore, the two kinds of granitoids have no geochemical characteristics of adakitic rocks, suggesting that they were generated from a normal or thinned crust level. The diorites have quite negative zircon ε_Hf(t) values (-18.4 to -21.1), suggesting they were from partial melting of the mafic lower continental crust. The granites have relatively higher zircon ε_Hf(t) values (-14.4 to -18.1). The granites also contains a series of old inherited zircon cores, such as two upper intercept ages of 2 628±41 and 1 840±37 Ma, and a concordant age of 807±9 Ma. All these features suggest that the granites were generated from partial melting of the felsic middle-lower continental crust. Thus, the Huilanshan Early Cretaceous granitoids coupled with the Luotian extensional dome revealed the collapsed process of the Dabie Orogen.
- orogenic collapse,
- magmatism,
- partial melting,
- lower continental crust,
- Dabie Orogen

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References(48)

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Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen

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Geochemistry, Zircon U-Pb Age and Hf Isotope of the Huilanshan Granitoids in the North Dabie Terrane: Implications for Syn-Collapse Magmatism of Orogen

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