Japan Geoscience Union Meeting 2022

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S (Solid Earth Sciences ) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT20] New perspectives on accretion and exhumation processes during oblique plate convergence

Tue. May 31, 2022 9:00 AM - 11:00 AM Online Poster Zoom Room (23) (Ch.23)

convener:Timothy B Byrne(University of Connecticut), convener:Jian-Cheng Lee(Academia Sinica), Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), convener:Yui Kouketsu(Department of Earth & Planetary Sciences, Graduate School of Environmental Studies, Nagoya University), Chairperson:Timothy B Byrne(University of Connecticut), Jian-Cheng Lee(Academia Sinica), Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), Yui Kouketsu(Department of Earth & Planetary Sciences, Graduate School of Environmental Studies, Nagoya University), Gong-ruei Ho(Academia Sinica, Institute of Earth Sciences)

9:00 AM - 11:00 AM

[SIT20-P04] A new structural transect along the Southern Central Range metamorphic core and sedimentary cover (Taiwan): tectonic development and new metamorphic temperatures constrains.

*Lucas Mesalles1, Decheng Yi2, Yuan-Hsi Lee1 (1.National Chung-Cheng University, Department of Earth and Environmental Science, 2.National Cheng-Kung University, Department of Earth Science)

Keywords:Taiwan mountain belt, mountain building, metamorphism

We present a new structural transect along the Dalun River and the eastern South Cross-Island Highway in the southeastern flank of Taiwan’s Central Range mountains integrating recent geological field work in the area. Based on field geological relationships and structural analysis, a relative chronology of deformation is proposed, which, with the help of new and existing geochronological constrains, is placed in an absolute chronological framework. Additionally, we present new maximum metamorphic temperatures along the transect based on Raman Spectroscopy of Carbonaceous Material, providing additional constrains on the metamorphic conditions undergone by the sedimentary cover, and the Yuli and Taroko metamorphic belts. Finally we attempt to integrate our results and observations into a coherent model of the tectonic development of the Central Range Mountains.