Citation:

dsdp.proc.76.129.1983

Name: (Table 2) Physical properties at DSDP Holes 44-391 and 76-534
Creator: Thomas H Shipley
Published: 1983
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1983 (exact date unknown) • DOI registered: 2013-05-08

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Abstract:

Laboratory measurements on sediment samples and density well logs run at DSDP Site 534 in the Blake-Bahama Basin were used to establish an in situ velocity and density structure. Synthetic seismograms were generated for comparison to reprocessed seismic reflection data in the vicinity of the Site. Uncertainties in the relative positions of the hole and seismic reflection data, velocity corrections, and the composition of the unrecovered section were evaluated. In light of the errors and compressed section, no unique correlation of the seismic reflection data to the drill hole is completely defensible either in this chapter or elsewhere.

The preferred correlation resulting from this exercise is as follows, with the Site 534 report correlation shown in parentheses where different. Horizon beta', 887 m; Horizon beta, 950 m (975 m); Horizon C , 1202 m (1250 m); Horizon C, 1268 m (1340 m); Horizon D', 1342 m (1432 m); Horizon D, 1550 m (1552 m).

The major differences in these correlations arise from the use of slightly different velocities and hole location relative to the seismic profiles. The Site 534 report results rely on hole placement on a basement flank, whereas in this chapter we locate it within a basement depression still within the uncertainty of the navigation. The Site 534 report also uses drilling rates, CDP velocity analyses, sonobuoy data, and previous similar drilling correlation methods used at Site 391, along with other geologic considerations in arriving at differing results. Although the correlation method used in this investigation is more objective and the hole location uncertainties better defined, in order to have confidence in any results we will require drilling in areas where reflections are either more widely spaced or where we have better vertical velocity control in the hole.

Project(s):

Deep Sea Drilling Project (DSDP)

Coverage:

Median Latitude: 28.286050 * Median Longitude: -75.497200 * South-bound Latitude: 28.228800 * West-bound Longitude: -75.612700 * North-bound Latitude: 28.343300 * East-bound Longitude: -75.381700

Date/Time Start: 1975-09-02T00:00:00 * Date/Time End: 1980-10-21T00:00:00

Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 1635.3 m

Event(s):

44-391 * Latitude: 28.228800 * Longitude: -75.612700 * Date/Time: 1975-09-02T00:00:00 * Elevation: -4974.0 m * Penetration: 4.5 m * Recovery: 2.3 m * Location: North Atlantic/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 cores; 4.5 m cored; 0 m drilled; 51.1 % recovery

76-534 * Latitude: 28.343300 * Longitude: -75.381700 * Date/Time: 1980-10-21T00:00:00 * Elevation: -4973.0 m * Penetration: 87.5 m * Recovery: 2.1 m * Location: North Atlantic/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 cores; 2 m cored; 0 m drilled; 105 % recovery

Comment:

Sediment depth is given in mbsf. Values from depths 500 to 545.8 m are a combination of data from both sites.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	Lithologic unit/sequence	Unit		Shipley, Thomas H		There are further subdivision of the lithologic subunit to indicate changes in physical properties or abundances not considered relevant to the sedimentology
4	Lithology/composition/facies	Lithology		Shipley, Thomas H
5	Percentage	Perc	%	Shipley, Thomas H		Abundance
6	Percentage	Perc	%	Shipley, Thomas H		Abundance, assuming all unrecovered section is mud-mudstone. These were used in Model 2
7	Velosity, vertical	Vel ver	km/s	Shipley, Thomas H	see reference(s)	Laboratory data, supplemented in a few places with data extrapolated from adjacent units
8	Density, wet bulk	WBD	g/cm³	Shipley, Thomas H	see reference(s)	Laboratory data, supplemented in a few places with data extrapolated from adjacent units
9	Porosity	Poros	% vol	Shipley, Thomas H	see reference(s)	Laboratory data, supplemented in a few places with data extrapolated from adjacent units
10	Velosity, vertical	Vel ver	km/s	Shipley, Thomas H	see reference(s)	In situ corrections based on porosity rebound of Hamilton (1976) with qualification that the density log was interpreted to indicate no systematic rebound for terrigenous sediments below 940 m and below 700 m for chalks; depths 950-1107 and 1342-1625.3 same as labratory
11	Density, wet bulk	WBD	g/cm³	Shipley, Thomas H	see reference(s)	In situ corrections based on porosity rebound of Hamilton (1976) with qualification that the density log was interpreted to indicate no systematic rebound for terrigenous sediments below 940 m and below 700 m for chalks; depths 950-1107 and 1342-1625.3 same as labratory
12	Density, wet bulk	WBD	g/cm³	Shipley, Thomas H	see reference(s)	Login situ densities varied significantly from calculated values, these were used to determine in situ velocity and used in the models. There are no corrections for hydrostatic pressure or temperature
13	Velosity, vertical	Vel ver	km/s	Shipley, Thomas H	see reference(s)	Model 1
14	Density, wet bulk	WBD	g/cm³	Shipley, Thomas H	see reference(s)	Model 1
15	Velosity, vertical	Vel ver	km/s	Shipley, Thomas H	see reference(s)	Model 2; depths 0-914 same as model 1
16	Density, wet bulk	WBD	g/cm³	Shipley, Thomas H	see reference(s)	Model 2; depths 0-914 same as model 1

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

518 data points

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