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    • Mineralogy and origin of sediments from drill holes on the Continental Margin off Florida, 1965-1969 (NCEI Accession 7100714)

    Metadata Updated: March 1, 2025

    This dataset refers to an analog publication and contains no digital representation of any data.

    Drill cores obtained during the Joint Oceanographic Institutions' Deep Earth Sampling Program from the continental shelf, the Florida-Hatteras Slope, and the Blake Plateau off northern Florida are composed of sediments ranging in age from Paleocene to post-Miocene. Calcite is the dominant mineral in all the cores; dolomite is almost completely restricted to the shelf and slope cores. Aragonite persists in samples as old as Oligocene, but the magnesian calcite occurs only in post-Miocene samples. In general, only Miocene samples contain non-carbonate minerals in appreciable quantity. Phosphates are limited largely to the Miocene sediments. Here also, the clay minerals palygorskite, sepiolite, and montmorillonite are dominant. These clay minerals and the zeolites clinoptiolite and phillipsite in Miocene and older sediments suggest that volcanic activity was the principal source of non-carbonate deposition during much of the Tertiary. Heavy-mineral analyses suggest a southern Appalachian source for detrital materials. Terrigenous detrital material is scarce in most of the cores except for the surface samples on the continental shelf. The concentration of detrital quartz here probably resulted from reworking and winnowing by regression and transgression of the sea during Pleistocene rather than by increased influx of Terrigenous material.

    Consolidated chertlike rocks consist of dominantly carbonate minerals in the near-shore holes and dominantly opaline cristobalite in the Blake Plateau holes. Reflux dolomitization by dense brines produced in evaporative lagoons in the area of the continental shelf and later incursions of fresh ground water from the Florida peninsula may have lithified sediments in the near-shore holes. Only when conditions were favorable for silicification were sediments on the Blake Plateau appreciably consolidated.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Date 2025-02-16T13:24:33Z
    Metadata Created Date June 25, 2021
    Metadata Updated Date March 1, 2025
    Reference Date(s) July 12, 2023 (publication)
    Frequency Of Update asNeeded

    Metadata Source

    Harvested from NOAA/NESDIS/ncei/accessions

    Other Data Resources

    Graphic Preview

    Graphic not available.

    Additional Metadata

    Resource Type Dataset
    Metadata Date 2025-02-16T13:24:33Z
    Metadata Created Date June 25, 2021
    Metadata Updated Date March 1, 2025
    Reference Date(s) July 12, 2023 (publication)
    Responsible Party (Point of Contact)
    Contact Email
    Guid gov.noaa.nodc:7100714
    Access Constraints Cite as: United States Geological Survey (2023). Mineralogy and origin of sediments from drill holes on the Continental Margin off Florida, 1965-1969 (NCEI Accession 7100714). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/7100714. Accessed [date]., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
    Bbox East Long -76
    Bbox North Lat 32
    Bbox South Lat 28
    Bbox West Long -82
    Coupled Resource
    Frequency Of Update asNeeded
    Graphic Preview Description Graphic not available.
    Graphic Preview File https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:7100714
    Graphic Preview Type PNG
    Harvest Object Id e51dbeda-a1af-4b94-87f3-d0af3487b8fa
    Harvest Source Id c084a438-6f6b-470d-93e0-16aeddb9f513
    Harvest Source Title NOAA/NESDIS/ncei/accessions
    Licence accessLevel: Public
    Lineage
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-82.0, 28.0], [-76.0, 28.0], [-76.0, 32.0], [-82.0, 32.0], [-82.0, 28.0]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1965-05-01
    Temporal Extent End 1969-12-31

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