Grain fabric measured using magnetic susceptibility anisotropy in deformed sediments of the Barbados accretionary prism:Leg 110

Hounslow, M. W. (1990) Grain fabric measured using magnetic susceptibility anisotropy in deformed sediments of the Barbados accretionary prism:Leg 110. Proceedings of the Ocean Drilling Program, Scientific Results. pp. 257-275.

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Abstract

The fabric observed in initial accretion is largely produced by overprinting of the original sedimentary susceptibility anisotropy by an E-W horizontal tectonic shortening and vertical extension. The response of the sediments to stress during initial accretion is variable and appears to reflect the inhomogeneous distribution of strain rate in the overthrust sequence. The slope sediments deposited on the accreted sequence are also affected by tectonic shortening. The accreted sequences at Sites 673 and 674 show a complex history of fabric modification, with previous tectonic fabrics overprinted by later fabric modifications, pointing to continued tectonic shortening during the accretion process. The form of the susceptibility anisotropy axes at Sites 673 and 674 is consistent with NE-SW shortening, probably reflected in the NW-SE surface expression of the out-of-sequence thrusts. The susceptibility anisotropy appears to document a downhole change in the trend of shortening from E to W at the surface to more NE-SW at depth, probably as a result of the obliquely trending basement ridge, the Tiburon Rise. -from Author

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Ocean Drilling Program, Scientific Results
Additional Information:
Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
168273
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Deposited On:
06 Apr 2022 14:30
Refereed?:
Yes
Published?:
Published
Last Modified:
03 May 2022 01:38