PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG

WANG Liang-yu; LIAO Qun-an; XIAO Dian; LUO Ting; ZHAO Hao; LIU Hong-fei; WANG Guo-can

Volume 22 Issue 4

Dec. 2016

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Article Navigation > Journal of Geomechanics > 2016 > 22(4): 1032-1048

WANG Liang-yu, LIAO Qun-an, XIAO Dian, et al., 2016. PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG. Journal of Geomechanics, 22 (4): 1032-1048.

Citation:

WANG Liang-yu, LIAO Qun-an, XIAO Dian, et al., 2016. PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG. Journal of Geomechanics, 22 (4): 1032-1048.

Citation:

WANG Liang-yu, LIAO Qun-an, XIAO Dian, et al., 2016. PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG. Journal of Geomechanics, 22 (4): 1032-1048.

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PETROGENESIS AND TECTONIC SIGNIFICANCE OF EARLY CARBONIFEROUS A-TYPE GRAINTE IN HARLIK, XINJIANG

WANG Liang-yu^{1, 2
,},
LIAO Qun-an^{1
,
,},
XIAO Dian^{1, 3},
LUO Ting¹,
ZHAO Hao¹,
LIU Hong-fei¹,
WANG Guo-can¹

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

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Abstract

Abstract

The alkali-feldspar granite is located at the area of Nanshankou, western part of the Harlik Mountain. Its LA-ICP-MS zircon U-Pb age is 331.3±1.9 Ma. Therefore, the granite is formed in the late stage of Early Carboniferous. The dark minerals in the rock are mainly biotite, with litte Na amphibolite. This type of granite is riched in alkali elements, poor in calsium, magnesium, and has low content of aluminum and iron oxide. The rock is riched in large ion lithosphile elements, such as Rb, Th and K. It has abundant HFSE elements and depleted in Ba, Sr and Eu. The 10000 Ga/Al value is varied from 2.93~3.80. It indicates that the rock is A-type granite, formed in intraplate tectonic settings, instead of the previous island arc environment. Its εNd(t) values range from 5.66 to 6.12, the Nd model ages are 600~620 Ma. It tells that the magma may originate from the young crust. Based on the results of the 1:50000 regional geological survey, the Bogada rift was extended during Early Carboniferous, and closed at the late stage of Early Carboniferous. The Late Early Carboniferous alkali-feldspar granites should formed in the rift environment, instead of coming from the previous post-collisional or arc tectonic setting.
- A-type granites,
- late Early Carboniferous,
- rift,
- Harlik

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References(62)

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