Desde el cinturón de pliegues y cabalgamientos al prisma de acreción en el sur de Taiwánestructura cortical
- I. Expósito 1
- A. Jiménez-Bonilla 1
- M. Díaz-Azpiroz 1
- M. Sánchez-Gómez 1
- A. Crespo-Blanc 2
- María Puy Ayarza Arribas 3
- Ramon Carbonell Bertran 1
- 1 Instituto de Ciencias de la Tierra Jaume Almera ICTJA-CSIC
- 2 National Central University, Zhongli, Taiwan
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3
Universidad de Salamanca
info
ISSN: 1576-5172
Year of publication: 2021
Issue Title: X Congreso Geológico de España
Issue: 18
Pages: 33
Type: Article
More publications in: Geotemas (Madrid)
Abstract
In Taiwan there is an active, oblique arc-continent colision between the Luzon Arc on the Philippine Sea Plate and the con- tinental margin of Eurasia. The Fold-and-Thrust Belt (FTB) in Taiwan passes southwards into a submarine accretionary wedge at the Manila subduction zone. The aim of this contribution is to examine how an on land FTB changes into a marine accretionary prism in that tectonic context. Here we use surface geology, marine seismic reflection profiles, and seismic tomography models to obtain maps of the basal thrust and the depth to the Moho across a transition area. The basal thrust of the FTB/Prism system cuts laterally along-strike through the margin’s sedimentary cover to incorporate thicker Miocene pre-orogenic sediments onto its hanging wall as it passes from the submarine wedge to the on land FTB. The Moho shows changes of depth that may be related to the changes in crustal thickness and the obliquity of the collision. Because of this, crustal thickening is less pronounced beneath southern Taiwan where the thinner part of the margin is colliding with the arc. This research is part of project PGC2018-094227-B-I00 funded by the Spanish Research Agency from the Ministry of Science Innovation and Universities of Spain.