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  • American Association for the Advancement of Science (AAAS)  (1)
  • Enke  (1)
  • GSL (Geological Society of London)  (1)
  • 1
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    Porosity modeling and stress evaluation in the Barbados Ridge Accretionary Complex (1989)
    Enke
    In:  Geologische Rundschau, 78 (1). pp. 197-205.
    Details
    Publication Date: 2020-07-30
    Description: Based on sediment physical property data from DSDP/ ODP Legs 78A and 110 (Barbados Ridge Complex), a simple palinspastic reconstruction scheme was employed to study porosity changes during accretion. Undoing the compactional effects caused by imbricate stacking of wedge slices, a synthetic pre-accretion porosity depth profile was developed, which bears strong resemblence to a characteristic profile from a reference drillhole in front of the Barbados accretionary complex. Differences between synthetic and reference profile are interpreted in terms of a semiquantitative estimate of the relative impact of the horizontal stress component on gravitational compaction in accretionary wedge environments. An exponential relationship between depth and porosity divergence for distinct lithologic units is evident. The defined relationship facilitates the analysis of deformational behavior of accreted sediments in general.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Tectonic framework of the mud mounds, associated BSRs and submarine landslides off shore Nicaragua pacific margin (2008)
    GSL (Geological Society of London)
    In:  Journal of the Geological Society, 165 . pp. 167-176.
    Details
    Publication Date: 2019-10-17
    Description: The regional distribution of mounds, associated bottom-simulating reflectors (BSRs) and submarine landslides of the Pacific margin of Nicaragua suggests a genetic relationship between them. In the landslide-dominated parts of the margin, mud mounds occur in groups upslope behind the scarps and aligned parallel to the headwall. The morphotectonic features associated with the slides suggest that the slope failure could be triggered by slope oversteepening on the trailing flank of subducted seamounts. Geometric analysis of the faults triggering and controlling the mud mounds and associated BSRs also indicates that they were caused by collapses of the uplifted sea floor. Thus we propose a simple conceptual genetic model for the occurrences of the submarine landslides, surrounding mud mounds and associated BSRs in the area. Seamount subduction created locally higher fluid overpressure in the décollement. The uplift and fracturing of the margin wedge above the subducting seamount opened pathways for the overpressured fluid to escape, leading to the formation of numerous mud mounds on the sea floor and the BSR in the subsurface. The higher fluid supply locally reduced the shear strength of the sediments and facilitated failure of these sediments as landslides on the oversteepened slope caused by the subduction of the seamount.
    Type: Article , PeerReviewed
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  • 3
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    Asphalt volcanism and chemosynthetic life, Campeche Knoll, Gulf of Mexico (2004)
    American Association for the Advancement of Science (AAAS)
    In:  Science, 304 . pp. 999-1002.
    Details
    Publication Date: 2016-09-09
    Description: In the Campeche Knolls, in the southern Gulf of Mexico, lava-like flows of solidified asphalt cover more than 1 square kilometer of the rim of a dissected salt dome at a depth of 3000 meters below sea level. Chemosynthetic tubeworms and bivalves colonize the sea floor near the asphalt, which chilled and contracted after discharge. The site also includes oil seeps, gas hydrate deposits, locally anoxic sediments, and slabs of authigenic carbonate. Asphalt volcanism creates a habitat for chemosynthetic life that may be widespread at great depth in the Gulf of Mexico.
    Type: Article , PeerReviewed
    Format: text
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