The geological evolution of the Aden-Owen-Carlsberg triple junction (NW Indian Ocean) since the late Miocene

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doi: 10.1029/2017TC004687
Author(s): Rodriguez, Mathieu; Fournier, Marc; Chamot-Rooke, Nicolas; Huchon, Philippe; Delescluse, Matthias
Author Affiliation(s): Primary:
Paris Sciences et Lettres (PSL) Research University, Ecole Normale Supérieure, Laboratoire de Géologie, Paris, France
Université Paris VI, France
Volume Title: Tectonics
Source: Tectonics, 37(5), p.1552-1575. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0278-7407 CODEN: TCTNDM
Note: In English. 86 refs.; illus., incl. block diag., sects., sketch maps
Summary: The Aden-Owen-Carlsberg triple junction is the place where Arabia, Somalia, and India meet in the Arabian Sea (NW Indian Ocean). Here we present a new seismic data set crossing a key structure of the triple junction, namely, the Beautemps-Beaupré pull-apart basin at the southern end of the Owen Fracture Zone. The seismic data set is tied to Ocean Drilling Program Leg 117 Sites at the top of the Owen Ridge, which provides a detailed tectono-stratigraphic framework since the Late Miocene. We show that the triple junction configuration has been disturbed by a major kinematic change at ∼8 Ma and since then experienced a series of transient structural adjustments. A major structural episode is recorded at 2.4 Ma, expressed by the opening of the Beautemps-Beaupre Basin and the uplift of its southern flank (the Beautemps-Beaupre Ridge). This episode is coeval with the formation of the present-day Owen Fracture Zone and must be considered as a part of a major structural reorganization of the entire India-Arabia plate boundary up to the Makran subduction zone. This 2.4-Myr-old geological episode is unrelated to any significant kinematic change, leaving questions over its driving mechanism. Abstract Copyright (2018). American Geophysical Union. All Rights Reserved.
Year of Publication: 2018
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Aden-Owen-Carlsburg triple junction; Angular unconformities; Arabian Plate; Arabian Sea; Basins; Bathymetry; Beautemps-Beaupre Basin; Beautemps-Beaupre Ridge; Cenozoic; Contourite; Correlation; Deformation; Earthquakes; Extension tectonics; Faults; Filters; Geophysical methods; Geophysical profiles; Geophysical surveys; Gravity anomalies; Growth faults; Indian Ocean; Indian Plate; Indus Fan; Kinematics; Leg 117; Lithosphere; Mechanism; Miocene; Multibeam methods; Neogene; Normal faults; Northwestern Indian Ocean; ODP Site 722; Ocean Drilling Program; Oceanic lithosphere; Owen Ridge; Owen fracture zone; Plate boundaries; Plate tectonics; Pull-apart basins; Seismic methods; Seismic profiles; Sheba Ridge; Strike-slip faults; Surveys; Tectonics; Tertiary; Turbidite; Unconformities; Uplifts; Upper Miocene
Coordinates: N120000 N160000 E0600000 E0560000
Record ID: 2019053117
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom