Gondwana breakup; no evidence for a Davie fracture zone offshore northern Mozambique, Tanzania and Kenya

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doi: 10.1111/ter.12214
Author(s): Klimke, Jennifer; Franke, Dieter
Author Affiliation(s): Primary:
Bundesanstalt für Geowissenschaften und Rohstoffe, Hanover, Germany
Volume Title: Terra Nova
Source: Terra Nova, 28(4), p.233-244. Publisher: Wiley-Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Note: In English. 54 refs.; illus., incl. sects., sketch maps
Summary: Plate tectonic reconstructions assume a major inactive transform fault, the Davie Fracture Zone, in the West Somali Basin, along which Madagascar is thought to have migrated southwards following Gondwana breakup in the Mesozoic. Based on the interpretation of reflection seismic data, we show that the Walu Ridge offshore Kenya and the Kerimbas Basin offshore northern Mozambique are tectonically unrelated to the southward motion of Madagascar and correlate with Late Cretaceous volcanism and inversion in Kenya and the evolution of the East African Rift System respectively. Offshore Tanzania, geophysical data do not show basement structures indicating the presence of a major transform fault. These results challenge the commonly supported transform margin concept and imply a more southerly pre-breakup position of Madagascar within Gondwana. Opening of the West Somali Basin by SW-propagating oblique rifting and seafloor spreading is proposed. Abstract Copyright (2016), John Wiley & Sons, Ltd.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Africa; Basement; Bottom features; Cenozoic; Concepts; Continental margin; Cretaceous; DSDP Site 241; DSDP Site 242; Davie Ridge; Davie fracture zone; Deep Sea Drilling Project; Displacements; East Africa; East African Rift; Faults; Fracture zones; Free-air anomalies; Geophysical methods; Geophysical profiles; Geophysical surveys; Gondwana; Gravity anomalies; Gravity field; Indian Ocean; Indian Ocean Islands; Inversion tectonics; Jurassic; Kenya; Kerimbas Basin; Kerimbas Graben; Leg 25; Madagascar; Magnetic anomalies; Mesozoic; Mid-ocean ridges; Movement; Mozambique; Mozambique Channel; Neogene; Ocean floors; Paleogeography; Plate tectonics; Prestack migration; Reconstruction; Reflection methods; Research vessels; Rifting; Sea-floor spreading; Seismic methods; Seismic migration; Seismic profiles; Somali Basin; Strike-slip faults; Surveys; Tanzania; Tectonics; Tertiary; Transform faults; Uplifts; Upper Cretaceous; Volcanism; Walu Ridge; West Somali Basin
Coordinates: S022215 S022214 E0444047 E0444046
S155039 S155039 E0414914 E0414914
Record ID: 2017010828
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom