Basal accretion, a major mechanism for mountain building in Taiwan revealed in rock thermal history
| Autor: | Chih Tung Chen, Jacques Malavieille, Ching-Hua Lo, Yuan-Hsi Lee, Jui Ting Tang, Yu-Chang Chan, Chia-Yu Lu |
|---|---|
| Přispěvatelé: | National Central University, Zhongli, Institute of Earth Sciences [Tapei] (IES Sinica), Academia Sinica, National Taiwan University, Taipei, Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), National Chung Cheng University, Chiayi |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics
Laser ablation 010504 meteorology & atmospheric sciences Geochemistry Basal accretion Geology Time-temperature history Taiwan mountain belt 010502 geochemistry & geophysics Overprinting 01 natural sciences Wedge (geometry) Tectonics Mountain formation Thermal Cleavage (geology) Orogenic wedge Geomorphology Mountain root 0105 earth and related environmental sciences Earth-Surface Processes Zircon |
| Zdroj: | Journal of Southeast Asian earth sciences Journal of Southeast Asian earth sciences, Elsevier, 2018, 152, pp.80-90. ⟨10.1016/j.jseaes.2017.11.030⟩ |
| ISSN: | 0743-9547 |
| DOI: | 10.1016/j.jseaes.2017.11.030⟩ |
| Popis: | International audience; Deep tectonic processes are key integral components in the evolution of mountain belts, while observations of their temporal development are generally obscured by thermal resetting, retrograde alteration and structural overprinting. Here we recorded an integrated rock time-temperature history for the first time in the pro-wedge part of the active Taiwan arc-continent collision starting from sedimentation through cleavage-forming state to its final exhumation. The integrated thermal and age results from the Raman Spectroscopy of Carbonaceous Material (RSCM) method, zircon U-Pb laser ablation dating, and in-situ 40Ar/39Ar laser microprobe dating suggest that the basal accretion process was crucial to the development of the Taiwanese orogenic wedge. The basal accretion process commenced early in the mountain building history (∼6 Ma) and gradually migrated to greater depths, as constrained by persistent plate convergence and cleavage formation under nearly isothermal state at similar depths until ∼ 2.5 Ma recorded in the early-accreted units. Such development essentially contributed to mountain root growth by the increased depth of the wedge detachment and the downward wedge thickening during the incipient to full collision stages in the Taiwan mountain belt. |
| Databáze: | OpenAIRE |
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