PETROGENESIS AND TECTONIC IMPLICATIONS OF TWO TYPES EARLY SILURIAN GRANITES IN EAST JUNGGAR

XIAO Dian; LIAO Qun-an; WANG Liang-yu; ZHAO Hao; ZHA Yan-hong; ZHAO Hong-wei; YIN Ting-wang; TIAN Jin-ming; LIU Hong-fei

2016 Vol. 22, No. 4

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Article navigation > Journal of Geomechanics > 2016 > 22(4): 1049-1061

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XIAO Dian, LIAO Qun-an, WANG Liang-yu, ZHAO Hao, ZHA Yan-hong, ZHAO Hong-wei, YIN Ting-wang, TIAN Jin-ming, LIU Hong-fei. PETROGENESIS AND TECTONIC IMPLICATIONS OF TWO TYPES EARLY SILURIAN GRANITES IN EAST JUNGGAR[J]. Journal of Geomechanics, 2016, 22(4): 1049-1061.

Citation:

PETROGENESIS AND TECTONIC IMPLICATIONS OF TWO TYPES EARLY SILURIAN GRANITES IN EAST JUNGGAR

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Sichuan Geological Survey, Chengdu 610081, China
3.
No. 243 Geological Party of Nuclear Industry, CNNC, Chifeng 024006, Inner Mongolia, China

More Information

Corresponding author: LIAO Qun-an, qanliao@cug.edu.cn

Received Date: 16 September 2016

Publish Date: 25 December 2016

Abstract

Abstract

The early Silurian monzogranite and syenogranite are located in the western section of Harlik Mountain with a NWW-trending, which intrude into the Ordovician Tashui Formation (O_1-2t). The LA-ICP-MS zircon U-Pb dating shows their emplacement ages are 438.8±2.3 Ma~435.8±3.1 Ma. The rocks have high contents of silicon (SiO₂=73.0~77.8%)and potassium (K₂O=3.31~4.26%), and low contents of magnesium (MgO=0.03~0.59%), with moderate aluminum saturation index (A/CNK=1.02~1.08), which show that the rocks are high-K calc-alkaline, weakly peraluminium series. Monzogranites exhibit strongly fractionated REE patterns with moderate negative Eu anomalies, and they are depleted in Nb, Ta, Ti, P, but enriched in Rb, Ba, K, showing notable fractionated Ⅰ-type granitoids with mafic lower continental crust as a potential magma source. Syenogranites show remarkably depletion of Eu, P, Ti and Sr, and enrichment of Rb, K, Zr and Hf, showing A-type granites affinity, whose magma source maybe the dehydrated felsic upper continental crust. Combined with the stratigraphic unconformity in this region, we propose that the East Junggar is in a post-collisional setting rather than arc-related setting during the early Silurian. The upwelling asthenosphere provided enhanced heat flux and triggered the partial melting of the juvenile crust, and resulted in the generation of various Silurian post-collisional granites in East Jungga.
- Harlik /
- Silurian /
- A-type granite /
- post-collision

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