Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi

HUANG Cheng; SHEN Ruiwen; NAN Zhenglu; FU Lianggang; LIU Sheng; CAI Dizhu; WANG Hui; YU Yangzhong

2017 Vol. 36, No. 2-3

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HUANG Cheng, SHEN Ruiwen, NAN Zhenglu, FU Lianggang, LIU Sheng, CAI Dizhu, WANG Hui, YU Yangzhong. Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi[J]. Geological Bulletin of China, 2017, 36(2-3): 209-223.

Citation:

HUANG Cheng, SHEN Ruiwen, NAN Zhenglu, FU Lianggang, LIU Sheng, CAI Dizhu, WANG Hui, YU Yangzhong. Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi[J]. Geological Bulletin of China, 2017, 36(2-3): 209-223.

Zircon U-Pb ages and geochemical characteristics of Early Indosinian Liuwanshan granites, Guangxi

1.
No. 9 Gold Geological Party of CAPF, Haikou 571127, Hainan, China
2.
School of Sciences and Resources, China University of Geosciences, Beijing 100083, China
3.
The Third General Gold Geological Party of CAPF, Chengdu 610036, Sichuan, China
4.
Hebei Institute of Regional Geology and Mineral Resources Survey, Langfang 065000, Hebei, China

Received Date: 30 September 2015

Revised Date: 06 June 2016

Publish Date: 25 March 2017

Abstract

Abstract

The Liuwanshan granites consist mainly of cordierite-bearing biotite monzogranite, which can be divided into four emplacement units according to rock structure and the emplacement relationship. LA-ICP-MS zircon U-Pb dating shows that the ²⁰⁶Pb/²³⁸U weighted average ages of zircons from these emplaced units are 252.8±1.9Ma (MSWD=0.92), 249.2±1.9Ma (MSWD=1.2), 248.3 ± 3.2Ma (MSWD=2.1), and 246.8 ± 2.8Ma (MSWD=2.2), respectively. Geochemical data reveal that these granites are characterized by enrichment of large ion lithophile elements (LILE, such as Rb and K) and relative depletion of high field strength elements (HFSE, such as Nb, Ta and Ti), suggesting geochemical characteristics of typical subduction-related arc magmatic rocks. REE distribution patterns show right-inclined shape with obvious Eu negative anomaly and relative enrichment of HREE, which is consistent with crust-source granites distribution patterns. La-La/Sm diagram indicates that the Liuwanshan granites were mainly formed by partial melting and experienced a certain degree of fractional crystallization. Combined with petrochemical characteristics, trace elements geochemeical characteristics and tectonic setting discrimination diagrams, the authors have reached the conclusion that Liuwanshan granites were formed in a tectonic setting of early ocean-continent subduction and later continental collision.
- Liuwanshan /
- LA-ICP-MS zircon U-Pb dating /
- geochemestry /
- genesis of granites

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References

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