Mineralogy and Origin of Sediments From Drill Holes on the Continental Margin Off Florida, 1965-1969 (NCEI Accession 7100714)

Metadata Updated: February 27, 2019

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 inthe 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.

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Metadata Date December 8, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 27, 2019
Reference Date(s) December 8, 2017 (publication)
Frequency Of Update asNeeded

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Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date December 8, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 27, 2019
Reference Date(s) December 8, 2017 (publication)
Responsible Party (Point of Contact)
Contact Email
Access Constraints Cite as: US DOI > US Geological Survey (2017). Mineralogy and Origin of Sediments From Drill Holes on the Continental Margin Off Florida, 1965-1969 (NCEI Accession 7100714). NOAA National Centers for Environmental Information. Unpublished Dataset. [access date], 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
Guid gov.noaa.nodc:7100714
Harvest Object Id 757485d7-0e53-45a7-9884-6efb90e61425
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence Data in this archival information package are not currently available for public download from NCEI. Please contact NCEI Information Services directly for access to these data., accessLevel: Public
Metadata Language eng
Metadata Type geospatial
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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