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LIU Jianmin, LIU Xiaochun, ZHAO Yue, ZHANG Shuanhong, XU Gang, DONG Shuwen, MAO Qian, CHEN Bailin. 2021. Microstructure and geochronology of pseudotachylite from the Hamm Peak, East Antarctica, and its geological significances. Journal of Geomechanics, 27(5): 747-758. doi: 10.12090/j.issn.1006-6616.2021.27.05.061
Citation: LIU Jianmin, LIU Xiaochun, ZHAO Yue, ZHANG Shuanhong, XU Gang, DONG Shuwen, MAO Qian, CHEN Bailin. 2021. Microstructure and geochronology of pseudotachylite from the Hamm Peak, East Antarctica, and its geological significances. Journal of Geomechanics, 27(5): 747-758. doi: 10.12090/j.issn.1006-6616.2021.27.05.061
shu

Microstructure and geochronology of pseudotachylite from the Hamm Peak, East Antarctica, and its geological significances

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Research Center of Polar Geosciences, China Geological Survey, Beijing 100081, China

  • 3.

    Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China

  • 4.

    School of Earth Science and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China

  • 5.

    Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

    • Fund Project: This research is financially supported by the National Natural Science Foundation of China(Grant No.41941004)
Received Date:  30 June 2021
Revised Date:  30 August 2021
Publish Date:  28 October 2021
    Abstract

  • The pseudotachylite in granulite facies granitic gneisses from the Hamm Peak, southwestern Prydz Bay, East Antarctica, occurs along the east-west-trending ductile-brittle shear zone. The characteristics of microstructure show that the pseudotachylite was formed by the frictional-melt during the rapid faulting along the paleoseismic zone. This inference is supported by the common presence of spherulites and different morphological microlites, such as skeletal, dendritic, acicular and globular in the matrix of pseudotachylite. There exist two kinds of microlite mineral assemblage. One consists mainly of hyperite and plagioclase, which developed in the northeastern part of the shear zone. The other consists of biotite, plagioclase, alkali feldspar and quartz, etc, which developed in the southwestern part of the shear zone. The occurrence of different kinds of microlite mineral assemblage indicates the differences of tectonic surrounding and stress distribution along different parts of the shear zone. Moreover, the presence of aluminous-rich hyperite may indicates the relatively high temperature and high pressure in the ambient physical condition during the pseudotachylite formation and crystallization afterwards, i.e., under the granulite facies conditions. The K-Ar age of bulk matrix of pseudotachylite is 878.1±16.8 Ma. Bulk 40Ar/39Ar step-heating release spectrum gave the varying ages mainly from 925 to 626 Ma. Combined with the regional comparison, we conclude that the pseudotachylite formed during the Grenvillian tectonic events.

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