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LIANG Tao, LU Ren, LU Xinxiang, WEN Jingjing. LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the Jiaogou syenite in western Henan Province and its geological implications[J]. Geological Bulletin of China, 2020, 39(5): 681-691.
Citation: LIANG Tao, LU Ren, LU Xinxiang, WEN Jingjing. LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the Jiaogou syenite in western Henan Province and its geological implications[J]. Geological Bulletin of China, 2020, 39(5): 681-691.
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LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the Jiaogou syenite in western Henan Province and its geological implications

  • 1.

    General Institute of Non-ferrous Metals Geologic Exploration of Henan Province, Zhengzhou 450052, Henan, China

  • 2.

    Key Laboratory of Deep Ore-prospecting Technology Research for Non-ferrous Metals of Henan Province, Zhengzhou 450052, Henan, China

  • 3.

    Institute of Land and Resources of Henan Province, Zhengzhou 450051, Henan, China

Received Date:  30 June 2019
Revised Date:  14 October 2019
Publish Date:  15 May 2020
    Abstract

  • The Zhifang-Huangzhuang(ZH)area in western Henan Province has the largest outcrop of Indosinian alkaline intrusives in eastern Qinling orogenic belt.In this paper, the LA-ICP-MS zircon U-Pb ages as well as major elements and trace elements of the Jiaogou syenite were tested in order to obtain new constraint on formation time, rock source of partial melting and tectonic process of syenites in the ZH area.The U-Pb dating sample JG1701 is aegirine-augite syenite, and zircon age spectrum is composed of 7 age groups(~2.6 Ga, ~2.5 Ga, ~2.4 Ga, ~2.3 Ga, ~2.1 Ga, ~1.9 Ga and~243 Ma).The weighted mean age of 6 zircon spots form the last group is 243.2±4.8 Ma, which suggests that it was formed in Middle Triassic.The Jiaogou syenite is ultrapotassic rocks and belongs to alkaline-peralkaline series with higher Na2O+K2O content(11.50%~14.01%), alkalinity ratios(3.92~9.17)and K2O/Na2O ratios(3.78~10.25).The total rare earth elements(REEs)and(La/Yb)N ratios of the Jiaogou syenite are 176×10-6~315×10-6 and 9.51~20.43, which shows the characteristics of LREE enrichment and HREE depletion without obvious Eu negative anomaly.They are enriched in large ion lithophile elements and depleted in high field strength elements, exhibiting negative anomalies of Th, Nb, Ta, P and Ti and positive anomalies of Ba, K, Zr and Hf in spider diagram.The source rock of the Jiaogou syenite was situated in the garnet-spinel transition zone at the depth of about 60~80 km, and its residual phases included phlogopite, Ti-enriched minerals such as rutile and ilmenite, garnet and spinel.The Jiaogou syenite is the mixed product of mantle-derived K-enriched magmas/fluids and crust-derived magmas/fluids, and it was controlled by regional lithosphere delamination in Middle Triassic.

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