Zircon U-Pb geochronology and petrogenesis of rhyolites in Manketouebo Formation from the Kundu area in Jarud Basin, Inner Mongo-lia

ZHANG Chao; ZHANG Yujin; QUAN Jingyu; GUO Wei; GUO Jiangang; WANG Qingzhao; LI Wei; WANG Yan; SONG Weimin; NA Fuchao; TAN Hongyan

2018 Vol. 37, No. 9

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ZHANG Chao, ZHANG Yujin, QUAN Jingyu, GUO Wei, GUO Jiangang, WANG Qingzhao, LI Wei, WANG Yan, SONG Weimin, NA Fuchao, TAN Hongyan. Zircon U-Pb geochronology and petrogenesis of rhyolites in Manketouebo Formation from the Kundu area in Jarud Basin, Inner Mongo-lia[J]. Geological Bulletin of China, 2018, 37(9): 1633-1643.

Citation:

ZHANG Chao, ZHANG Yujin, QUAN Jingyu, GUO Wei, GUO Jiangang, WANG Qingzhao, LI Wei, WANG Yan, SONG Weimin, NA Fuchao, TAN Hongyan. Zircon U-Pb geochronology and petrogenesis of rhyolites in Manketouebo Formation from the Kundu area in Jarud Basin, Inner Mongo-lia[J]. Geological Bulletin of China, 2018, 37(9): 1633-1643.

Zircon U-Pb geochronology and petrogenesis of rhyolites in Manketouebo Formation from the Kundu area in Jarud Basin, Inner Mongo-lia

1.
Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, Liaoning, China
2.
College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
3.
Shenyang Tests Research Center, Northeast China Coal Field Geology Bureau, Shenyang 110016, Liaoning, China

Received Date: 20 March 2018

Revised Date: 28 June 2018

Publish Date: 15 September 2018

Abstract

Abstract

Age and tectonic implications of the Late Jurassic rhyolites in Kundu area of Jarud Basin were studied by using zircon U-Pb dating, in situ Lu-Hf isotopic analysis, petrographic analysis and other geochemical methods. LA-ICP-MS zircon U-Pb dating results show that the rhyolites were formed in Late Jurassic, with their formation age being 151.2±1.2Ma. The geochemical study suggests that rhyolites are rich in silicon and alkali, but poor in calcium and magnesia. The REE values of them are between 110.38×10^-6 and 138.88×10^-6, displaying medium LREE-enriched and HREE-depleted REE patterns[(La/Yb)_N=6.24~7.43], with weak negative Eu anomaly (δEu=0.72~0.98). The trace element geochemistry is characterized evidently by enrichment of Cs, Rb, Ba and LREE, strong depletion of Sr, P, Ti, and mediate depletion of Nb, Ta, with the ε_Hf(t) values varying from -10.1~4.9, corresponding to T_DM^C model ages of 1192~3639Ma, which shows that the rhyolitc magma originated mainly from the partial melting of Proterozoic and Archean crustal rocks, and suffered fractional crystallization. Based on the above result, in combination with previous studies of the contemporaneous magma-tectonic activities in Da Hinggan Mountains, the authors hold that the rhyolites in Manketouebo Formation were formed in an extensional setting related to Mongolia Okhotsk orogenesis
- Jarud Basin /
- Late Jurassic /
- rhyolites /
- Manketouebo Formation /
- zircon U-Pb dating /
- Hf isotope

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References

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