Zircon U-Pb age, petrogenesis and teceonic setting of the Yabulai adakite, northern Alxa Block, Inner Mongolia

WANG Kailei; ZHANG Xuemeng; LI Huikai; ZHENG Le; ZHANG Jiaxing; XING Dongxue; CHEN Tao; HOU Zhanyuan

2021 Vol. 40, No. 9

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WANG Kailei, ZHANG Xuemeng, LI Huikai, ZHENG Le, ZHANG Jiaxing, XING Dongxue, CHEN Tao, HOU Zhanyuan. Zircon U-Pb age, petrogenesis and teceonic setting of the Yabulai adakite, northern Alxa Block, Inner Mongolia[J]. Geological Bulletin of China, 2021, 40(9): 1443-1458.

Citation:

WANG Kailei, ZHANG Xuemeng, LI Huikai, ZHENG Le, ZHANG Jiaxing, XING Dongxue, CHEN Tao, HOU Zhanyuan. Zircon U-Pb age, petrogenesis and teceonic setting of the Yabulai adakite, northern Alxa Block, Inner Mongolia[J]. Geological Bulletin of China, 2021, 40(9): 1443-1458.

Zircon U-Pb age, petrogenesis and teceonic setting of the Yabulai adakite, northern Alxa Block, Inner Mongolia

No. 519 Geological Party, North China Geological Exploration Bureau, Baoding 071051, Hebei, China

Received Date: 10 September 2019

Revised Date: 15 April 2020

Publish Date: 15 September 2021

Abstract

Abstract

Yabulai adakite is located in the western part of Yabulai-Nuorigong-Honggueryulin belt, northern Alxa Block.The main rock types of the Yabulai adakite are diorite and quartz diorite.The LA-ICP-MS zircon U-Pb dating results are 275±1 Ma(MSWD=1.00, n=27, diorite) and 277±2 Ma(MSWD=0.64, n=26, quartz diorite), which shows that the ages of the adakite are between 275 Ma and 277 Ma, suggesting a product of Early Permian.Geochemical characteristics show that the Yabulai adakite with high content of SiO₂(60.56%~63.41%), Al₂O₃ (15.86%~17.33%), Sr(572×10^-6~758×10^-6) and low content of MgO(1.45%~3.06%), Y(11.1×10^-6~14.7×10^-6), Yb(1.06×10^-6~1.55×10^-6), enrichment of large ion lithophile elements(such as K, Rb, Ba and Sr), and depletion of high field-strength elements(such as Ta, Nb, Ti and P).The Yabulai adakite is typical C-type adakite with high content of Mg#(38~53), the ratio of Y/Yb is between 7.35 and 11.89, and Na₂O/K₂O is between 1.18 and 1.77;in addition, it exhibits significant fractionation between LREE and HREE and is depleted in HREE with slight Eu anomaly(0.81 < δEu < 1.04).The authors hold that the Yabulai adakite was formed by partial melting of delaminated lower crust and interaction with the mantle peridotite, and magmatic mixing was experienced during diagenesis.Combined with previous studies, the authors hold that the Yabulai adakite might have been formed in a post-collision extension stage.
- adakite /
- zircon U-Pb dating /
- Yabulai /
- magma mixing /
- Alxa Block

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