Citation:

odp.proc.sr.164.235.2000

Name: (Table 1) Paleomagnetic characteristics of sediments from ODP Leg 164 sites
Creator: Yoshihisa Hiroki
Published: 2000
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The Blake Ridge, offshore South Carolina, was drilled at three sites, Sites 994, 995, and 997, during Ocean Drilling Program Leg 164. During the cruise, shipboard paleomagnetic measurements were performed to establish a magnetostratigraphy to refine age dates of the sediments. Shipboard measurements yielded a preliminary reversal stratigraphy (Shipboard Scientific Party, 1996, doi:10.2973/odp.proc.ir.164.1996). The routine paleomagnetic measurements of continuous core sections with the pass-through cryogenic magnetometer after alternating field (AF) demagnetization at 20 mT showed downhole inclination profiles with negative and positive intervals in the sections recovered with the advanced hydraulic piston corer (APC). The cryogenic results agreed with the results from analysis of discrete samples. The reversal stratigraphy was constructed based on the cryogenic and discrete sample results.

Although the primary reversal stratigraphy was constructed for each site during the cruise, the boundaries of magnetic polarity zones were poorly constrained because there were insufficient polarity measurements obtained from the discrete sample analysis (Only one or two samples per core were made in the intervals recovered with the APC; fewer were made in the intervals cored with the extended core barrel [XCB]. Each core is 9.5 m). Therefore, I conducted shore-based paleomagnetic analyses to determine more precise locations of the magnetic polarity zones and reversals for the APC-cored intervals at Sites 994, 995, and 997.

In this report, I describe progressive AF demagnetization behavior of the samples and present paleomagnetic declination, inclination, and intensity data before and after AF demagnetization. Magnetic polarity zones are defined for the APC-cored intervals of Sites 994, 995, and 997, and these are presented with nannofossil data and interpreted nannofossil zonations (Okada, 2000, doi:10.2973/odp.proc.sr.164.232.2000).

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 31.810767 * Median Longitude: -75.512300 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545900 * North-bound Latitude: 31.843100 * East-bound Longitude: -75.468600

Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-12-10T00:10:00

Minimum DEPTH, sediment/rock: 0.25 m * Maximum DEPTH, sediment/rock: 176.89 m

Event(s):

164-994C * Latitude: 31.785700 * Longitude: -75.545900 * Date/Time Start: 1995-11-08T12:45:00 * Date/Time End: 1995-11-15T01:10:00 * Elevation: -2799.1 m * Penetration: 703.5 m * Recovery: 501.47 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 84 cores; 703.5 m cored; 0 m drilled; 71.3 % recovery

164-995A * Latitude: 31.803500 * Longitude: -75.522400 * Date/Time Start: 1995-11-20T07:49:00 * Date/Time End: 1995-11-26T13:08:00 * Elevation: -2778.5 m * Penetration: 704.5 m * Recovery: 478.71 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 83 cores; 704.5 m cored; 0 m drilled; 68 % recovery

164-997A * Latitude: 31.843100 * Longitude: -75.468600 * Date/Time Start: 1995-12-06T12:35:00 * Date/Time End: 1995-12-10T00:10:00 * Elevation: -2770.1 m * Penetration: 434.3 m * Recovery: 342.66 m * Location: Nicaraguan Rise, North Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 434.3 m cored; 0 m drilled; 78.9 % recovery

Comment:

Sediment depth is given in mbsf. Declination (core) = declination referred to arbitrary core coordinates, (relative to the x-axis direction defined by the double-line fiducial mark in the center of the core liner on the working half of the cores), declination (oriented) = declination oriented to geographic coordinates (relative to geographic north) with the Tensor tool.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Latitude of event	Latitude
3	Longitude of event	Longitude
4	Elevation of event	Elevation	m
5	Sample code/label	Sample label		Hiroki, Yoshihisa	DSDP/ODP/IODP sample designation
6	DEPTH, sediment/rock	Depth sed	m			Geocode
7	NRM, Inclination	Incl (NRM)	deg	Hiroki, Yoshihisa
8	NRM, Declination	Decl (NRM)	deg	Hiroki, Yoshihisa		core
9	NRM, Declination	Decl (NRM)	deg	Hiroki, Yoshihisa		oriented
10	NRM, Intensity	Inten (NRM)	mA/m	Hiroki, Yoshihisa	Magnetometer, cryogenic, 2G Enterprises 750
11	NRM, Inclination after demagnetization	Incl (AF)	deg	Hiroki, Yoshihisa
12	NRM, Declination after demagnetization	Decl (AF)	deg	Hiroki, Yoshihisa		core
13	NRM, Declination after demagnetization	Decl (AF)	deg	Hiroki, Yoshihisa		oriented
14	NRM, Intensity after demagnetization	Inten (AF)	mA/m	Hiroki, Yoshihisa	Magnetometer, cryogenic, 2G Enterprises 750	after the unstable low-coercivity component is removed
15	Demag Type	Demag Type		Hiroki, Yoshihisa		type of response to progressive AF demagnetization, see Method section in article for explanation
16	Polarity	Polarity		Hiroki, Yoshihisa		N = normal polarity, R = reversed polarity, ? = less certain, - = uncertain
17	Sample comment	Sample comment		Hiroki, Yoshihisa		X = onboard data

License:

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

Size:

6273 data points

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