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Submarine topography and shallow structure of the Madagascar Ridge, western Indian Ocean

1980; Geological Society of America; Volume: 91; Issue: 12 Linguagem: Inglês

10.1130/0016-7606(1980)91 2.0.co;2

1943-2674

Jean Goslin, J. Ségoufin, R. Schlich, Robert L. Fisher,

Geology and Paleoclimatology Research

Research Article| December 01, 1980 Submarine topography and shallow structure of the Madagascar Ridge, western Indian Ocean JEAN GOSLIN; JEAN GOSLIN 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France Search for other works by this author on: GSW Google Scholar JACQUES SEGOUFIN; JACQUES SEGOUFIN 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France Search for other works by this author on: GSW Google Scholar ROLAND SCHLICH; ROLAND SCHLICH 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France Search for other works by this author on: GSW Google Scholar ROBERT L. FISHER ROBERT L. FISHER 2Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093 Search for other works by this author on: GSW Google Scholar Author and Article Information JEAN GOSLIN 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France JACQUES SEGOUFIN 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France ROLAND SCHLICH 1Institut de Physique du Globe, Laboratoire de Géophysique Marine, 4, Avenue de Neptune, 94100 Saint Maur des Fossés, France ROBERT L. FISHER 2Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1980) 91 (12): 741–753. https://doi.org/10.1130/0016-7606(1980)91 2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation JEAN GOSLIN, JACQUES SEGOUFIN, ROLAND SCHLICH, ROBERT L. FISHER; Submarine topography and shallow structure of the Madagascar Ridge, western Indian Ocean. GSA Bulletin 1980;; 91 (12): 741–753. doi: https://doi.org/10.1130/0016-7606(1980)91 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Bathymetric, seismic-reflection, seismic-refraction, and magnetic-anomaly data suggest that the Madagascar Ridge consists of two different domains. North of 31°S, both the sea floor and the basement topography appear to be locally and regionally complex. Small sediment-filled pockets are present between numerous basaltic basement highs. Large-scale normal faulting shapes the western flank; on the east, the Late Cretaceous fracture zones of the Madagascar Basin penetrate deeply into the ridge. South of 32°S, an extensive area of thick undeformed sediments is found over the central part of the ridge. Two prominent seismic horizons — the upper one being attributed to an unconformity between lower Eocene–upper Oligocene and lower Miocene sediments — can be mapped throughout this area. The steep western slope reflects the Mozambique Basin fracture-zone trends. Both the topography and sediment cover at the southeastern limit are closely related to the north-south–trending fracture zones of the Southwest Indian Ridge. The character of magnetic anomalies is in accord with this regional subdivision. An east-west–trending rise situated near 32°S and marked by the 4,000-m isobath marks the former boundary of two spreading systems that are related to the Central Indian Ridge and the Southwest Indian Ridge. The shallow structural data and our interpretation of those data favor an oceanic nature for the entire Madagascar Ridge. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.