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Seismic imaging evidence that forearc underplating built the accretionary rock record of coastal North and South America

Published online by Cambridge University Press:  09 September 2019

David W. Scholl Open the ORCID record for David W. Scholl [Opens in a new window]
David W. Scholl*
Affiliation:
University of Alaska Fairbanks, Emeritus, Los Gatos, CA, USA
*
Author for correspondence: David W. Scholl, Email: [email protected]
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Abstract

The submerged forearcs of Pacific subduction zones of North and South America are underlain by a coastally exposed basement of late Palaeozoic to early Tertiary age. Basement is either an igneous massif of an accreted intra-oceanic arc or oceanic plateau (e.g. Cascadia(?), Colombia), an in situ formed arc massif (e.g. Aleutian Arc) or an exhumed accretionary complex of low and high P/T metamorphic facies of late Palaeozoic (e.g. southern Chile, Patagonia) and Mesozoic age (e.g. Alaska). Seismic studies at Pacific forearcs image frontal prisms of trench sediment accreted to the seaward edge of forearc basement. Frontal prisms tend to be narrow (10–40 km), weakly consolidated and volumetrically small (∼35–40 km3/km of trench). In contrast, deep seismic imaging of submerged forearcs commonly reveals large volumes (∼2000 km3/km of trench) of underplated material accreted at subsurface depths of ∼10–30 km to the base of forearc basement. Underplates have been imaged below the southern Chile, Ecuador–Colombia, north Cascade, Alaska, and possibly the eastern Aleutian forearcs. Deep underplates have also been observed below the Japan and New Zealand forearcs. Seismic imaging of northern and eastern Pacific forearcs supports the conclusion drawn from field and laboratory studies that exposed low and high P/T accretionary complexes accumulated in the subsurface at depths of 10–30 km. It seems significant that imaged underplated bodies are characteristic of modern well-sedimented subduction zones. It also seems likely that large Pacific-rim underplates store a significant fraction of sediment subducted in Cenozoic time.

Keywords

Subductionaccretionunderplatingsubduction complex
Type
Original Article
Information
Geological Magazine , Volume 158 , Special Issue 1: Subduction zone processes and crustal growth mechanisms at Pacific-Rim continental margins: modern and ancient analogues , January 2021 , pp. 104 - 117
Copyright
© Cambridge University Press 2019

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