Tectonics of the Dalrymple Trough and uplift of the Murray Ridge (NW Indian Ocean)

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doi: 10.1016/j.tecto.2014.08.001
Author(s): Rodriguez, Mathieu; Chamot-Rooke, Nicolas; Huchon, Philippe; Fournier, Marc; Lallemant, Siegfried; Delescluse, Matthias; Zaragosi, Sébastien; Mouchot, Nicolas
Author Affiliation(s): Primary:
Ecole Normale Supérieure, Laboratoire de Géologie, Paris, France
Other:
Université Pierre et Marie Curie Université Paris 06, France
Université de Bordeaux, France
Beicip-Franlab, France
Volume Title: Tectonophysics
Source: Tectonophysics, Vol.636, p.1-17. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English. 105 refs.; illus., incl. 1 table, sketch maps
Summary: The Dalrymple Trough is a 150-km-long, 30-km-wide basin located at the northern termination of the Owen Fracture Zone (OFZ), which is the present-day active India-Arabia plate boundary. The Dalrymple Trough is closely associated with the Murray Ridge, a complex of prominent bathymetric highs located on its eastern flank. Recent multibeam mapping of the connection between the Dalrymple Trough and the OFZ revealed a horsetail structure, which suggests a close relationship between geological histories of both structures. However, the 3-6 Ma age of initiation of the OFZ contrasts with the commonly accepted Early Miocene emplacement of the Dalrymple Trough. Recent seismic lines document a new tectonic history of the Dalrymple Trough, involving two major episodes of deformation along the India-Arabia plate boundary at ∼ 8-10 Ma and ∼ 1.9 ± 0.9 Ma. The 8-10 Ma episode is marked by a system of folds linked to the main uplift of the southern Murray Ridge and the first uplift of the northern Murray Ridge. This episode is related to a global plate reorganization event in the Late Miocene, well expressed by intraplate deformation in the Central Indian Ocean. The Dalrymple Trough opened at ∼ 1.9 ± 0.9 Ma subsequently to the formation of a stepover at the India-Arabia plate boundary, coeval with the regional M-unconformity in the Oman abyssal plain, which marks a structural reorganization of the Makran accretionary wedge, and the last uplift of the northern Murray Ridge. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 16 Structural Geology; 20 Geophysics, Applied; Abyssal plains; Accretionary wedges; Arabian Plate; Arabian Sea; Cenozoic; Compression tectonics; DSDP Site 222; DSDP Site 223; Dalrymple Trough; Deep Sea Drilling Project; Deformation; Environmental geology; Faults; Fracture zones; Geophysical methods; Geophysical surveys; Indian Ocean; Indian Plate; Indus Fan; Leg 117; Leg 23; Makran Wedge; Marine methods; Miocene; Multibeam methods; Murray Ridge; Neogene; Neotectonics; Northwestern Indian Ocean; ODP Site 730; Ocean Drilling Program; Ocean floors; Oman abyssal plain; Owen fracture zone; Plate boundaries; Plate tectonics; Sedimentation; Sedimentation rates; Seismic methods; Strike-slip faults; Submarine fans; Surveys; Tectonics; Tertiary; Unconformities; Uplifts; Upper Miocene
Coordinates: N184458 N184459 E0600747 E0600746
N174353 N174354 E0574132 E0574131
N200529 N200530 E0613034 E0613033
N180000 N240000 E0640000 E0600000
Record ID: 2015013537
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands