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  • 1
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    Structure of the frontal part of the Andean Convergent Margin (1985)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 90 (B7). pp. 5429-5442.
    Details
    Publication Date: 2019-05-14
    Description: A multichannel seismic reflection record across the central Peru margin and trench was improved by processing 24 rather than the 12 channels previously processed and by thorough migrating to reject the strong diffractions that obscured weaker primary reflections. The increased resolution clarifies the structure of the 15‐km‐wide frontal accretionary complex and the adjacent truncated continental framework against which the trench sediment was imbricated. Resolved are individual thrust slices and packets adjacent to the trench axis, subducting sediment‐filled graben in the ocean crust beneath the lower slope, and a Tertiary stratigraphic section of the upper slope Yaquina Basin which is cut by normal faults. The resolution in this multichannel record provides criteria for reinterpreting single‐channel data off Chile with increased confidence. The previously proposed truncation of the South American continent along much of the Peru‐Chile Trench is confirmed and the development of an accretionary complex in front of the truncated continental crust appears to vary with the amount of sediment seen in the trench axis. The Andean margin frontal structure is similar to that off Central America, the Aleutian Trench, and the Japan Trench which suggests common truncation as well as accretion at the front of convergent margins.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/JB090iB07p05429
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Annotated record of the detailed examination of Mn deposits from DSDP Leg 84 (Holes 565 and 568) (1985)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The Middle America Trench was first drilled in 1979 during Leg 66 off Oaxaca, Mexico and Leg 67 off Guatemala as part of a broad effort to study the mechanics of plate subduction and continental accretion and erosion. Leg 84 was recommended by the JOIDES Advisory Panels specifically to further examine the tectonic and gas-hydrate problems which had been revealed in the previous survey.
    Keywords: 84-565; 84-568; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Identification; Leg84; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Pacific/SLOPE; North Pacific/TRENCH; Position; Quantity of deposit; Sample code/label; Sediment type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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