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2023 Vol. 50, No. 6
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ZHANG Jinming, CHEN Guangting, CAI Hangjia, TIAN Chengxiu, LEI Xiaoqing. 2023. Geochemical characteristics and zircon U-Pb age of gabbros in the Zhaqiaohe ophiolite mélange, and its limitation on the ocean ridge environment[J]. Geology in China, 50(6): 1837-1847. doi: 10.12029/gc20200416002
Citation: ZHANG Jinming, CHEN Guangting, CAI Hangjia, TIAN Chengxiu, LEI Xiaoqing. 2023. Geochemical characteristics and zircon U-Pb age of gabbros in the Zhaqiaohe ophiolite mélange, and its limitation on the ocean ridge environment[J]. Geology in China, 50(6): 1837-1847. doi: 10.12029/gc20200416002
shu

Geochemical characteristics and zircon U-Pb age of gabbros in the Zhaqiaohe ophiolite mélange, and its limitation on the ocean ridge environment

  • Qinghai Institute of Geological Survey/Qinghai Province Key Laboratory of Geological Process and Mineral Resources of Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China

    • Fund Project: Supported by the Qinghai Scholars Project (No.QHS201802) and the 1:50000 Regional Geological Survey of Suli Area, Tianjun County, Qinghai Province (No.1212011140088)
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  • Author Bio: ZHANG Jinming, male, born in 1982, master, senior engineer, majors in mineralogy and petrology; E-mail: 271883992@qq.com
Received Date:  16 April 2020
Revised Date:  02 June 2020
Publish Date:  25 December 2023
    Abstract

  • This paper is the result of geological survey engineering.

     Objective

    Zhaqiaohe ophiolite is located at the junction of the Middle Qilian and South Qilian tectonic belt. The ophiolite in the belt is composed of serpentinite, serpentinized pyroxene peridotite, gabbro, diabase, block bedded altered basalt, a small amount of pillow basalt and lenticular silicite. It is the west extension of the Lachishan ophiolite melange belt in Qinghai Province.

     Methods

    In this paper, the study on the chronology and petrogeochemistry of gabbro in Zhaqiaohe ophiolite has been carried out.

     Results

    According to the characteristic judgment of the main chemical components of the gabbro, such as SiO2, Na2O, K2O, (Fe2O3 + FeO) and MgO, the gabbro is tholeiitic series, belonging to tholeiite. According to the REE distribution pattern, there is no Eu anomaly or weak negative anomaly, indicating that the rock experienced the separation and crystallization of plagioclase in the melting process, and the REE distribution curve is approximately flat; the trace elements have obvious Ta and Sr positive anomaly characteristics, indicating that gabbro in ophiolite in this area has similar characteristics with E-MORB. The results of LA-ICP-MS zircon U-Pb dating show that the gabbro crystallization age is (524.0±2.5) Ma.

     Conclusions

    It is suggested that these gabbros originated from the initial slowness without large-scale melting. It is suggested that the Zhaqiaohe ophiolite may have formed in the oceanic ridge environment during the initial cracking stage of the paleo ocean basin.
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