Furuta, Toshio; Levi, Shaul; Facey, D (1983): (Table 1) Paleomagnetic properties of specimens from DSDP Holes 69-504B and 70-504B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.816633, Supplement to: Furuta, Toshio; Levi, Shaul (1983): Basement paleomagnetism of Hole 504B. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 697-703, https://doi.org/10.2973/dsdp.proc.69.144.1983
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Abstract:
Paleomagnetic and rock magnetic measurements of basalt specimens from DSDP Hole 504B, associated with the Costa Rica Rift, have a mean natural remanence intensity (Jn) between 5 and 10 x 10**-3 gauss, consistent with the presence of a magnetized layer that is 0.5 to 1 km thick, which produces the observed magnetic anomalies. A mean Koenigsberger ratio (Qn) greater than 10 indicates that the remanence dominates the magnetic signal of the drilled section. The susceptibility (x) increases with depth, and the median demagnetizing field (MDF) decreases with increasing depth in Hole 504B, congruent with the downhole increase in the relative abundance of massive flow units. Hole 504B is composed of at least 12 units with distinct stable average inclinations (Is), which probably represent extrusion at times of different geomagnetic field directions and possibly also the effects of faulting. The thickness of basalt associated with these inclination units varies from less than 9 meters to possibly as much as 160 meters. Two relatively thick magnetic units (40 m and 45 m, separated by 100 m) have anomalously high Is values of -53° and -63°, in contrast with the near zero inclinations expected for the equatorial latitude of Site 504. For this reason and because the average inclination of all the magnetic units is skewed to a negative value, it might be that the entire section at Hole 504B was tilted by approximately 30°.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 1.227100 * Median Longitude: -83.730100 * South-bound Latitude: 1.227000 * West-bound Longitude: -83.730200 * North-bound Latitude: 1.227200 * East-bound Longitude: -83.730000
Date/Time Start: 1979-10-07T00:00:00 * Date/Time End: 1979-12-04T00:00:00
Minimum DEPTH, sediment/rock: 278.9 m * Maximum DEPTH, sediment/rock: 828.6 m
Event(s):
69-504B * Latitude: 1.227200 * Longitude: -83.730200 * Date/Time: 1979-10-07T00:00:00 * Elevation: -3460.0 m * Penetration: 489 m * Recovery: 262 m * Campaign: Leg69 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL)
70-504B * Latitude: 1.227000 * Longitude: -83.730000 * Date/Time: 1979-12-04T00:00:00 * Elevation: -3460.0 m * Penetration: 836.1 m * Recovery: 91.6 m * Campaign: Leg70 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 328.6 m cored; 18.5 m drilled; 27.9 % recovery
Comment:
Sediment depth is given in mbsf. Magnetic units were defined by the stable inclination. Inclinations in parentheses denote NRM values; question marks indicate doubtful sample orientation or somewhat questionable stable inclinations.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Facey, D | DSDP/ODP/IODP sample designation | ||
| 3 | Unit | Unit | Facey, D | Magnetic | ||
| 4 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 5 | NRM, Intensity | Inten (NRM) | mA/m | Facey, D | Magnetometer, long-core spinner, Digico | Original unit mG, 1G = kA/m |
| 6 | Inclination | Incl | deg | Facey, D | Magnetometer, long-core spinner, Digico | |
| 7 | Susceptibility, volume | kappa | µGs/Oe | Facey, D | Susceptibility meter (Bison Instrument, Inc.) | |
| 8 | Koenigsberger ratio | Q-ratio | Oe | Facey, D | ||
| 9 | Median demagnetizing field | MDF | Oe | Facey, D | Magnetometer, long-core spinner, Digico |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
979 data points