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Post-collisional collapse in the wake of migrating arc-continent collision in the Ilan Basin, Taiwan

Peter D. Clift, Andrew T. S. Lin, Andrew Carter, Francis Wu, Amy E. Draut, T. H. Lai, L. Y. Fei, Hans Schouten and Louis Teng
Post-collisional collapse in the wake of migrating arc-continent collision in the Ilan Basin, Taiwan (in Formation and applications of the sedimentary record in arc collision zones, Amy E. Draut (editor), Peter D. Clift (editor) and David W. Scholl (editor))
Special Paper - Geological Society of America (2008) 436: 257-278

Abstract

The Ilan Basin of northern Taiwan forms the western limit of the Okinawa Trough, where the trough meets the compressional ranges of central Taiwan. Apatite fission-track ages of 1.2+ or -0.5 Ma and 3.5+ or -0.5 Ma, measured north and south of the basin, respectively, indicate faster exhumation rates in the Hsuehshan Range to the north (>1.6 mm/yr) than in the Backbone Range to the south (0.7 mm/yr). Reconstructed subsidence rates along the northern basin margin are also faster than in the south (6-7 compared with 3-5 mm/yr). Global positioning system (GPS) and active seismo-logical data indicate motion of the southern basin margin to the east and southeast. We propose that the Ilan Basin is being formed as a result of extension of northern Taiwan, largely controlled by a major southeast-dipping fault, modeled at approximately 30 degrees dip, and mapped as a continuation of the Lishan Fault, a major thrust structure in the Central Ranges. Flexural rigidity of the lithosphere under the basin is low, with elastic thickness approximately 3 km. A southwest-migrating collision between the Luzon Arc and southern China, accompanied by subduction polarity reversal in the Ryukyu Trench, has allowed crustal blocks that were previously held in compression between the Eurasian and Philippine Sea plates to move trenchward as they reach the northern end of the collision zone. Subduction polarity reversal permits rapid extension and formation of the Ilan Basin and presumably, at least, the western Okinawa Trough, as a direct consequence of arc-continent collision, not because of independent trench rollback forces. This conceptual model suggests that migrating arc-continent collision causes the rapid formation of deep marginal basins that are then filled by detritus from the adjacent orogen, and that these should be common features in the geologic record.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 436
Title: Post-collisional collapse in the wake of migrating arc-continent collision in the Ilan Basin, Taiwan
Title: Formation and applications of the sedimentary record in arc collision zones
Author(s): Clift, Peter D.Lin, Andrew T. S.Carter, AndrewWu, FrancisDraut, Amy E.Lai, T. H.Fei, L. Y.Schouten, HansTeng, Louis
Author(s): Draut, Amy E.editor
Author(s): Clift, Peter D.editor
Author(s): Scholl, David W.editor
Affiliation: University of Aberdeen, School of Geosciences, Aberdeen, United Kingdom
Affiliation: U. S. Geological Survey, Santa Cruz, CA, United States
Pages: 257-278
Published: 2008
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 73
Accession Number: 2008-111764
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
Secondary Affiliation: University of Aberdeen, GBR, United KingdomNational Central University, TWN, TaiwanUniversity and Birkbeck College London, GBR, United KingdomState University of New York at Binghamton, USA, United StatesU. S. Geological Survey, USA, United StatesCentral Geological Survey, TWN, TaiwanWoods Hole Oceanographic Institution, USA, United StatesNational Taiwan University, TWN, Taiwan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200841
Program Name: USGSOPNon-USGS publications with USGS authors
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