Age and geochemical features of the Early Devonian Xiangquan A-type syenogranites from Baoji area at the conjunction of Qinling and Qilian Orogen and their tectonic significance

XU Tong; CHEN Qingmin; GUO Qiming; ZHANG Shuanhou; MAO Youliang; WANG Qiang

2017 Vol. 36, No. 7

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XU Tong, CHEN Qingmin, GUO Qiming, ZHANG Shuanhou, MAO Youliang, WANG Qiang. Age and geochemical features of the Early Devonian Xiangquan A-type syenogranites from Baoji area at the conjunction of Qinling and Qilian Orogen and their tectonic significance[J]. Geological Bulletin of China, 2017, 36(7): 1118-1128.

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XU Tong, CHEN Qingmin, GUO Qiming, ZHANG Shuanhou, MAO Youliang, WANG Qiang. Age and geochemical features of the Early Devonian Xiangquan A-type syenogranites from Baoji area at the conjunction of Qinling and Qilian Orogen and their tectonic significance[J]. Geological Bulletin of China, 2017, 36(7): 1118-1128.

Age and geochemical features of the Early Devonian Xiangquan A-type syenogranites from Baoji area at the conjunction of Qinling and Qilian Orogen and their tectonic significance

1.
Shaanxi Geological Survey, Xi'an 710065, Shaanxi, China
2.
Shaanxi Center of Geological Survey, Xi'an 710065, Shaanxi, China
3.
Hanzhong Geological Branch, Shaanxi Bureau of Geology and Mineral Exploration and Development, Hanzhong 723000, Shaanxi, China

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Corresponding author: CHEN Qingmin, 156396685@qq.com

Received Date: 11 August 2016

Revised Date: 24 February 2017

Publish Date: 25 July 2017

Abstract

Abstract

Xiangquan syengranites are located in Baoji area at the conjunction of Qinling and Qilian Orogen, and their LA-ICPMS zircon U-Pb geochronological and petrogeochemical studies were conducted in this paper. The results show that the zircon ²⁰⁶Pb/²³⁸Pb weighted average age of Xiangquan syengranites is 410±5Ma (MSWD=0.20, n=18), indicating that the crystallization age of the syengranites is Early Devonian. Xiangquan syengranites are high in SiO₂ (SiO₂=69.63%~73.94%), K₂O (K₂O=4.24%~4.88%, K₂O/Na₂O=1.23~1.44), and TFe₂O₃ (TFe₂O₃=2.10%~3.70%, TFe₂O₃/MgO=3.88~6.84), but low in MgO (MgO=0.31%~0.94%) and P₂O₅(P₂O₅=0.08%~0.21%), belonging to high-K calc-alkaline series with metaluminous features. In addition, they are enriched in total REE (318×10^-6~499×10^-6), with obvious negative Eu anomaly (δEu=0.37~0.46). The trace elements show enrichement of Rb, Th, Zr, Sm and Ga (10000×Ga/Al=2.59~2.93), depletion of Ba, Nb, Ta and Sr, with the characteristics of A-type granites on the whole. Combined with regional data, the authors hold that the Xiangquan syenogranites were formed in a post-orogenic tectonic setting and derived from partially melted felsic crust under low pressures.
- Xiangquan syengranites /
- Baoji area /
- conjunction of Qinling and Qilian Orogen /
- post-orogenic A-type granites /
- Early Devonian

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