CLIP - Origin of the Caribbean Large Igneous Province (CLIP) in connection with the geodynamic evolution of the Central Caribbean - Cruise No. M81/2ab - March 11 - April 21, 2010 - Port of Spain (Trinidad and Tobago) - Bridgetown (Barbados)

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in METEOR-Berichte; M81/2ab; 1-48; METEOR-Berichte

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Dokumentinformationen

  • Format / Umfang:
    48 pages
  • ISSN:
  • DOI:
  • Medientyp:
    Aufsatz (Zeitschrift)
  • Format:
    Elektronische Ressource
  • Sprache:
    Englisch
  • Klassifikation:
    DDC:    550 Earth sciences and geology

Abstract

The main purpose of R/V METEOR cruise M81/2AB was to obtain new insights into the controversially discussed origin and geodynamic evolution of the Caribbean Large Igneous Province (CLIP) and the Caribbean Plate using an interdisciplinary approach combining structural geology, geodynamics, magnetics, volcanology, sedimentology, petrology, magmatic geochemistry and geochronology. The rock sampling on M81/2AB achieved its major objectives through successful 1) stratigrafically-controlled sampling of a complete basement section of the northern Beata Rise with Kiel 6000 ROV (remote operated vehicle), 2) extensive dredge sampling of the southern Beata Rise, and 3) the first representative hard rock sampling of the Hess-Escarpment region. The wide range of intrusive, volcanic and sedimentary rocks recovered on M81/2AB represents the most detailed marine sampling of the CLIP and associated features to date. SIMRAD EM120 and PARASOUND were used to select sampling stations and to assess the structural geology of the region. Multi-beam seafloor mapping and preliminary analyses of the recovered samples suggest large-scale tectonic movements of the Beata Rise and the area north of the Hess-Escarpment and a volcanic rather than continental origin for the Nicaragua Rise north of the Hess-Escarpment. The magnetic studies were also highly successful with more than 7,300 km of magnetic profiles being acquired. Magnetic anomalies measured on four parallel profiles in the Colombia Basin suggest that the crust is oceanic, but seafloor spreading anomalies could not be correlated. Along the Hess Escarpment high amplitude magnetic anomalies associated with morphological features indicate a volcanic origin and basaltic composition of the crust, consistent with the seafloor morphology and recovered samples.


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