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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The processes of underthrusting and underplating in the geologic record: Structural diversity between the Franciscan Complex (California), the Kodiak Complex (Alaska) and the Internal Ligurian Units (Italy)
Geological Journal, Volume 44, No. 2, Year 2009
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Description
Existing studies on active subduction margins have documented the wide diversity in structural style between acretionary prisms, both in space and time. Together with physical boundary conditions of the margins, the thickness of sedimentary successions carried by the lower plate seems to play a key role in controlling the deformation and fluid flow during accretion.We have tested the influence of the subducting sedimentary section by comparing the structural style and fluid-related structures of four units from three fossil accretionary complexes characterized by similar physical conditions but different subducting sediment thicknesses: (1) the Franciscan Complex of California, (2) the Internal Ligurian Units of Italy and (3) the Kodiak Complex, Alaska. Subducting plates bearing a thick sedimentary cover generally result in coherent accretion through polyphase deformation represented by folding and thin thrusting events, while underplating of sediment-starved oceanic sections results in diffuse deformation and mélange formation. These two structural styles can alternate through time in a single complex with a long record of accretion such as Kodiak. The parallel analysis of the selected analogues show that although the volume of sediments carried by the lower plate determines different structural styles, deformation is strongly controlled by injection of overpressured fluids during underthrusting and accretion. Transient hydrofracturing occurs through the development of a system of dilatant fractures grossly parallel to the décollement zone. Copyright © 2009 John Wiley & Sons, Ltd.
Authors & Co-Authors
Meneghini, Francesca
Italy, Pisa
Università Di Pisa
United States, Santa Cruz
University of California, Santa Cruz
Marroni, Michèle
Italy, Pisa
Università Di Pisa
Italy, Pisa
Istituto Di Geoscienze e Georisorse, Sezione Di Pisa
Moore, James Casey
United States, Santa Cruz
University of California, Santa Cruz
Pandolfi, Luca
Italy, Pisa
Università Di Pisa
Italy, Pisa
Istituto Di Geoscienze e Georisorse, Sezione Di Pisa
Rowe, Christie D.
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 65
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1002/gj.1144
e-ISSN:
10991034
Research Areas
Violence And Injury