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ZHU Yanfei, MU Hetaer·zhari, ZHAO Tongyang, HAN Qiong, ZHENG Jiaxing. 2018. Zircon U-Pb age and geochemical characteristics of Ordovician volcanic rocks from Kanasi area in Western Altay Mountains, Xinjiang[J]. Geology in China, 45(3): 469-482. doi: 10.12029/gc20180304
Citation: ZHU Yanfei, MU Hetaer·zhari, ZHAO Tongyang, HAN Qiong, ZHENG Jiaxing. 2018. Zircon U-Pb age and geochemical characteristics of Ordovician volcanic rocks from Kanasi area in Western Altay Mountains, Xinjiang[J]. Geology in China, 45(3): 469-482. doi: 10.12029/gc20180304
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Zircon U-Pb age and geochemical characteristics of Ordovician volcanic rocks from Kanasi area in Western Altay Mountains, Xinjiang

  • 1.

    Xinjiang University, Urimqi, 830000, Xinjiang, China

  • 2.

    Xinjiang Institute of Geological Survey, Urimiqi 830000, Xinjiang, China

    • Fund Project: Supported by China Geological Survey Program (No. 12120114040701)
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  • Author Bio: ZHU Yanfei, female, born in 1991, master candidate, majors in mineralogy, petrology, mineral deposits; E-mail: yuri666666@163.com
Received Date:  29 August 2016
Revised Date:  14 February 2017
Publish Date:  25 June 2018
    Abstract

  • There is a suite of volcanic-sedimentary strata comprising Dongxileke Formation in Kanasi area; nevertheless, there is no accurate ages and geochemical study for these rocks. The genesis and geodynamical background are in controversy for a long time. To tackle these problems, the authors chose a layered mylonitic dacite in this area as the study object. LA-ICP-MS zircon U-Pb ages of(445.4±3.1)Ma and(445.7±3.7)Ma from two mylonitic dacite samples suggest that these volcanic rocks erupted in late Ordovician and that Dongxileke Formation was formed in late Ordovician. The mylonitic dacite is characterized by SiO2 content from 53.99% to 71.04%, high Al2O3 (13.83%-16.27%) and low MgO (1.09%-3.53%), with K2O between 1.11% and 3.83%, 2.84% on average, suggesting high alkline volcanic rock series. The mylonitic dacite forms a LREE-enriched distribution pattern with the existence of negative Eu anomaly (δEu=0.65-0.82). Geochemical characteristics of mylonitic dacite suggest island-arc volcanic features characterized by enrichment of LILE such as Rb, Th and Ce and depletion of HFSE such as K, Nb and Ta. Combined with regional data and the results obtained by this study, the authors consider that the volcanic rocks were generated during syn-collision of the late stage subduction in an active continental margin arc. The background was the conversion from the northward subduction of Paleo-Asia Ocean under the Siberia plate to Altay micro landmass land, which resulted in the formation of late Ordovician volcanic rocks in an active continental margin arc of Kanasi area.

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