Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting

Jiangbo Wang; Tong Li; Yan Zhang; Weihong Li

doi:10.1007/s12583-020-1335-5

Volume 31 Issue 5

Oct 2020

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Journal of Earth Science > 2020 > 31(5): 867-874.

Jiangbo Wang, Tong Li, Yan Zhang, Weihong Li. Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting. Journal of Earth Science, 2020, 31(5): 867-874. doi: 10.1007/s12583-020-1335-5

Citation:

Jiangbo Wang, Tong Li, Yan Zhang, Weihong Li. Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting. Journal of Earth Science, 2020, 31(5): 867-874. doi: 10.1007/s12583-020-1335-5

Citation:

Jiangbo Wang, Tong Li, Yan Zhang, Weihong Li. Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting. Journal of Earth Science, 2020, 31(5): 867-874. doi: 10.1007/s12583-020-1335-5

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Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting

doi: 10.1007/s12583-020-1335-5

Jiangbo Wang^{1, 2
,},
Tong Li^{1
,
,
,},
Yan Zhang¹,
Weihong Li²

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.
Research Institute No. 203, CNNC, Xianyang 712000, China

More Information

Corresponding author: Tong Li, 93328299@qq.com
Received Date: 13 Mar 2020
Accepted Date: 20 Apr 2020
Publish Date: 20 Oct 2020

Abstract

Abstract

Paleozoic granites can provide important insights of crustal differentiation and collision process of the North Qinling terrane. The Dafanggou leucogranites that intruded in the Qinling Complex is a Paleozoic granite with zircon U-Pb age of 404±6.4 Ma (MSWD=0.13,n=9). The leucogranites display moderate SiO₂ (68.4 wt.% to 71.7 wt.%) content and high Na₂O/K₂O (1.07 to 2.74) and Sr/Y (42 to 65) ratios,and low A/CNK (1.04 to 1.08) and Rb/Sr (0.09 to 0.16) ratios. Combined with negative ε_Nd(t) (-10.4) and ε_Hf(t) (-9.35 to -0.25) values and ancient T_DM2 ages (1.2 to 1.7 Ga),suggesting the leucogranite are derived from ancient amphibolitic crust in the Qinling Group. In addition,the absence of coeval mafic igneous rocks or mafic enclaves occurred in the Dafanggou pluton and the low T_Zrn (~700℃) of leucogranites preclude that the leucogranites derived from high temperature dehydration melting of amphibolite. Thus,we propose that the occurrence of the Dafanggou leucogranite indicates that water-flux melting of middle-lower crust in post-collision setting may be a potential model for the genesis of granites in collisional orogenic belt.
- leucogranite,
- North Qinling,
- Late Paleozoic,
- crustal differentiation,
- zircon Lu-Hf isotope

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References(59)

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Water-Flux Melting of Amphibolite in Paleozoic Leucogranite from the North Qinling, Central China: Implication for Post Collisional Setting

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