https://scholars.lib.ntu.edu.tw/handle/123456789/386663
Title: | Development of arc-continent collision mélanges: Linking onshore geological and offshore geophysical observations of the Pliocene Lichi Mélange, southern Taiwan and northern Luzon arc, western Pacific | Authors: | Chi, W.-C. Chen, L. CHAR-SHINE LIU Brookfield, M. |
Keywords: | Arc-continental collision; Backthrust; Mélange; Seismic reflection profiles; Side-scan sonar; Taiwan | Issue Date: | 2014 | Journal Volume: | 636 | Start page/Pages: | 70-82 | Source: | Tectonophysics | Abstract: | Although the Lichi mélange has been studied intensively over the last decade, its enigmatic nature has generated debates regarding its origin and evolution. Two prominent models have been proposed to explain the Lichi melange: the olistostrome model with slumping sediments and the tectonic collision model with intensive shearing. Neither model can explain what causes the interpreted slumping and complex faulting processes for the sediments. Here, we study the Lichi melange using a time-space equivalence approach, in which the tectonics of the offshore continuation of the Lichi mélange should represent an earlier stage in its evolution. Our study of marine multichannel seismic data suggested that the backthrusts in the accretionary prism propagate arcward above and within the deforming forearc and arc basement to incorporate the sediment and basement materials into the rear of the accretionary prism. Therefore, we proposed the "retrowedge evolution model" whose novel key feature is that the irregular topography of the arc basement affects the taper angle of the retrowedge. The retrowedge has a greater taper than the minimum taper of the prowedge, so the slope can be steeper, and thus favors gravitational failure. Such processes would generate complex faulting and slumping processes in the backthrusted forearc ridge and basin. In sum, this retrowedge model reconciles the mixture of slumping and faulting processes found in the Lichi mélange. © 2014 Elsevier B.V. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84922380835&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/386663 |
DOI: | 10.1016/j.tecto.2014.08.009 | SDG/Keyword: | Buildings; Offshore oil well production; Prisms; Sediments; Seismic waves; Seismology; Topography; Backthrust; Continental collisions; Seismic reflection profiles; Side scan sonar; Taiwan; Faulting; accretionary prism; arc-continent collision; deformation; faulting; melange; seismic data; seismic reflection; seismology; slumping; spatiotemporal analysis; tectonic evolution; Taiwan |
Appears in Collections: | 海洋研究所 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.