Zircon U-Pb ages and geochemical characteristics of the quartz monzonite diorite rocks from Hanmiao area in the southern segment of the Da Hinggan Mountains

WANG Xi; REN Xigang; WANG Yan; HAO Fujiang; PEI Yao; LOU Renxing; XU Chengke

2018 Vol. 37, No. 9

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WANG Xi, REN Xigang, WANG Yan, HAO Fujiang, PEI Yao, LOU Renxing, XU Chengke. Zircon U-Pb ages and geochemical characteristics of the quartz monzonite diorite rocks from Hanmiao area in the southern segment of the Da Hinggan Mountains[J]. Geological Bulletin of China, 2018, 37(9): 1662-1670.

Citation:

WANG Xi, REN Xigang, WANG Yan, HAO Fujiang, PEI Yao, LOU Renxing, XU Chengke. Zircon U-Pb ages and geochemical characteristics of the quartz monzonite diorite rocks from Hanmiao area in the southern segment of the Da Hinggan Mountains[J]. Geological Bulletin of China, 2018, 37(9): 1662-1670.

Zircon U-Pb ages and geochemical characteristics of the quartz monzonite diorite rocks from Hanmiao area in the southern segment of the Da Hinggan Mountains

1.
Applied Technology College, Jilin University, Changchun 130012, Jilin, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
3.
Shenyang Center of China Geological Survey, Shenyang 110034, Liaoning, China

Received Date: 08 January 2018

Revised Date: 08 March 2018

Publish Date: 15 September 2018

Abstract

Abstract

In order to determine the geochronology, petrogenesis and tectonic background of the quartz monzonite diorite rocks in Hanmiao area, the authors conducted the research on petrology by means of LA-MC-ICP-MS zircon U-Pb geochronology and geochemistry. The results show that the zircons from the quartz monzonite diorite rocks are magmatic zircons, and the zircon ²⁰⁶Pb/²³⁸U dating yielded 134±1Ma(n=22, MSWD=0.42), suggesting late Early Cretaceous. The values of SiO₂, K₂O and Na₂O/K₂O are 63.44%~68.96%, 2.04%~3.84% and 0.47~1.17 respectively. The aluminum saturation indexes (A/CNK) range from 2.12 to 2.55. The rocks thus belong to calc-alkaline-high-K calc-alkaline series. The rocks are enriched in LILE (Rb, K) and incompatible elements(Th, U), strongly depleted in HFSE such as Nb, Ta, P and Ti. Combined with the study of regional tectonics the authors hold that the quartz monzonite diorite rocks might have been affected by subducted slab fluids. It was closely related to back-arc extension tectonics and lithospheric thinning after the subduction of Paleo-Pacific plate towards Eurasia plate.
- quartz monzonite diorite /
- geochemistry /
- LA-MC-ICP-MS zircon U-Pb age /
- Da Hinggan Mountains

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References

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