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Seismic imaging of subduction zone metamorphism

Stephane Rondenay, Geoffrey A. Abers and Peter E. van Keken
Seismic imaging of subduction zone metamorphism
Geology (Boulder) (April 2008) 36 (4): 275-278

Abstract

Combined analysis of high-resolution seismic images of the Alaska and Cascadia subduction zones reveals where metamorphic fluids are released. Both images show the subducted oceanic crust as a dipping low-velocity layer with a clear termination depth. However, in Alaska the crust is thicker (15-20 km compared to 8 km) and terminates at greater depth (120 km compared to 40 km) than in Cascadia. Based on metamorphic reaction estimates and geodynamic models, we demonstrate that the termination depth corresponds to eclogitization of the crust triggered by dehydration of water-bearing minerals, and that the location of this reaction is dependent on the thermal structure of the subducted slab.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 36
Serial Issue: 4
Title: Seismic imaging of subduction zone metamorphism
Affiliation: Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA, United States
Pages: 275-278
Published: 200804
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 2008-082517
Categories: Solid-earth geophysicsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2008067
Illustration Description: illus. incl. sects., sketch map
N51°00'00" - N72°00'00", W130°00'00" - E173°00'00"
Secondary Affiliation: Boston University, USA, United StatesUniversity of Michigan, USA, United States
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: 200824
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