中亚造山带南缘甘肃北山地区花牛山闪长玢岩地球化学特征及地质意义

王二腾; 武磊; 翟新伟; 陈万峰; 苏瑞欢; 郭志昂; 王赟; 王金荣

doi:10.3799/dqkx.2021.155

Volume 47 Issue 9

Sep. 2022

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Article Navigation > Earth Science > 2022 > 47(9): 3285-3300

Wang Erteng, Wu Lei, Zhai Xinwei, Chen Wanfeng, Su Ruihuan, Guo Zhiang, Wang Yun, Wang Jinrong, 2022. Geochronology, Petrogenesis and Tectonic Implications of Huaniushan Diorite Porphyrite from the Gansu Beishan Area in the Southern Central Asian Orogenic Belt. Earth Science, 47(9): 3285-3300. doi: 10.3799/dqkx.2021.155

Citation:

Wang Erteng, Wu Lei, Zhai Xinwei, Chen Wanfeng, Su Ruihuan, Guo Zhiang, Wang Yun, Wang Jinrong, 2022. Geochronology, Petrogenesis and Tectonic Implications of Huaniushan Diorite Porphyrite from the Gansu Beishan Area in the Southern Central Asian Orogenic Belt. Earth Science, 47(9): 3285-3300. doi: 10.3799/dqkx.2021.155

Citation:

Wang Erteng, Wu Lei, Zhai Xinwei, Chen Wanfeng, Su Ruihuan, Guo Zhiang, Wang Yun, Wang Jinrong, 2022. Geochronology, Petrogenesis and Tectonic Implications of Huaniushan Diorite Porphyrite from the Gansu Beishan Area in the Southern Central Asian Orogenic Belt. Earth Science, 47(9): 3285-3300. doi: 10.3799/dqkx.2021.155

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Geochronology, Petrogenesis and Tectonic Implications of Huaniushan Diorite Porphyrite from the Gansu Beishan Area in the Southern Central Asian Orogenic Belt

doi: 10.3799/dqkx.2021.155

School of Earth Sciences, Lanzhou University, Key Laboratory of Mineral Resources in Western China (Gansu Province) Lanzhou 730000, China

Received Date: 2021-10-15
Publish Date: 2022-09-25

Abstract

Abstract

To reveal the tectonic dynamic setting and timing of the ocean-continent transform in the southern Central Asian Orogenic Belt (CAOB), the geochronological data, major and trace elements and Sr-Nd-Pb isotopes of Late Paleozoic Huanuishan diorite porphyrites in the Beishan area of southern CAOB are studied. The diorite porphyrites yield a magmatic crystallization of 287.6±7.5 Ma (LA-ICP-MS zircon U-Pb dating). The SiO₂, K₂O+Na₂O contents are 53.92%-54.84%, 6.34%-6.82% respectively. The rocks have high Al₂O₃ (14.66%-15.23%), low MgO (3.20%-3.99%) with Mg^# values of 40.26-46.50. The diorite porphyrites have high LREE enrichment ((La/Yb)_N=20.07-21.33) with negative Eu anomalies (δEu=0.79-0.82), enriched in Cs, Rb, Ba, K, Th and Pb, weakly enriched in Zr and Hf, depleted in Nb, Ta, Ti, P and Sr. Their (⁸⁷Sr/⁸⁶Sr)_i values range from 0.707 009 to 0.708 799, (¹⁴³Nd/¹⁴⁴Nd)_i values 0.512 248 to 0.512 272, ²⁰⁶Pb/²⁰⁴Pb values 18.613 to 18.711 and ε_Nd(t) values are -0.39-+0.09. These features suggest that diorite porphyrites were derived from the mantle material, with assimilation and contamination by curst. Combined with regional geological background, the diorite porphyrites were formed in an intraplate extensional tectonic stage after the northward subduction and closure of Huitongshan-Zhangfangshan Ocean. These results indicate that the southern Beishan area has completed the ocean-continent tectonic transform during the Early Permian.
- diorite porphyrite,
- geochemistry,
- ocean-continent tectonic transform,
- Beishan area,
- Central Asian Orogenic Belt

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References(51)

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