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Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America; implications for building the rock record of convergent margins

Paola Vannucchi, Peter B. Sak, Jason P. Morgan, Ken'ichi Ohkushi and Kohtaro Ujiie
Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America; implications for building the rock record of convergent margins
Geology (Boulder) (July 2013) 41 (9): 995-998

Abstract

Integrated Ocean Drilling Program (IODP) Expedition 334 to southern Costa Rica, Central America, documented unprecedented subduction erosion in an area of active seismic slip. Widespread subduction erosion of the upper plate initiated when the Cocos Ridge, an overthickened aseismic ridge, arrived at the Middle America Trench. Subduction erosion was coeval with the rapid formation of deposition centers on the forearc of the upper plate. The completely recovered shelf sequence constrains a short (<2 m.y.) interval of extreme subsidence ( approximately 1200 m) with a rapid pulse occurring during the first approximately 0.3 m.y. This event removed an estimated 1.2 X 10 (super 6) km (super 3) of forearc material at a rate of approximately 1690 km (super 3) /m.y./km of trench during a time of rapid ( approximately 1035 m/m.y.) shelf sediment accumulation. At this erosive margin, a sediment-starved trench persisted, in spite of abundant sediment supply, because subduction erosion led to the creation of forearc basins. Similar rapid pulses of subduction erosion may punctuate the evolution of many margins, contributing disproportionately to crustal recycling at subduction zones with implications for the evolution of continental crust and mountain belts, and recycling of continental material into the mantle.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 9
Title: Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America; implications for building the rock record of convergent margins
Affiliation: University of London-Royal Holloway, Egham, United Kingdom
Affiliation: Integrated Ocean Drilling Program, Expedition 334 ScientistsCollege Station, TXUnited States
Pages: 995-998
Published: 20130711
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 2013-061454
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2013278
Illustration Description: illus. incl. geol. sketch map
N08°40'51" - N08°40'51", W84°02'02" - W84°02'01"
Secondary Affiliation: Dickinson College, USA, United StatesKobe University, JPN, JapanTsukuba University, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201337
Program Name: IODPIntegrated Ocean Drilling Program
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