Housden, J; Tucker, Peter; O'Reilly, W (1984): A magneto-mineralogical study of basalt at DSDP Leg 73 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.811207, Supplement to: Housden, J et al. (1984): A magneto-mineralogical study of basalt samples from Holes 519A, 522B, and 524, Leg 73 of the Deep Sea Drilling Project. In: Hsü, KJ; LaBrecque, JL; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 73, 687-698, https://doi.org/10.2973/dsdp.proc.73.130.1984
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Abstract:
The basalts in Holes 519A, 522B, and 524 were studied for intensity of natural remanent magnetization, magnetic hysteresis, magnetic susceptibility, stability of isothermal remanence, and thermomagnetic behavior. Some of these properties are sensitive to both the composition and the microstructure of the magnetic minerals, others to composition only. Thus it is possible to separate the two effects and to trace the variation of effective magnetic grain size and degree of alteration within a lithologic unit or over a yet larger distance or time interval. The flow in Hole 519A is highly maghemitized at the top, the degree of maghemitization decreasing with depth in the flow. Effective grain size increases with increasing depth. Electron microprobe analysis of the titanomaghemite grains in these samples provides no support for the leaching out of iron during alteration. The pillows and flows in Hole 522B are distributed among a number of cooling units, and no systematic downhole variations are apparent. The inferred magneto-petrology is consistent with the cooling and alteration history that might be expected within the units. The upper and lower sills in Hole 524 are more uniform and have a larger concentration of well-developed magnetic mineral grains than the pillows and flows in Holes 519A and 522B. Maghemitization appears to have developed from the boundaries of the sills that are in contact with the sediments between the sills.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -27.692813 * Median Longitude: -2.839833 * South-bound Latitude: -29.484200 * West-bound Longitude: -11.666200 * North-bound Latitude: -26.114000 * East-bound Longitude: 3.512300
Date/Time Start: 1980-04-22T00:00:00 * Date/Time End: 1980-05-21T00:00:00
Event(s):
73-519 * Latitude: -26.136700 * Longitude: -11.666200 * Date/Time: 1980-04-22T00:00:00 * Elevation: -3769.0 m * Penetration: 151.6 m * Recovery: 138.1 m * Location: South Atlantic/RIDGE * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 151.6 m cored; 0 m drilled; 91.1 % recovery
73-519A * Latitude: -26.136700 * Longitude: -11.666200 * Date/Time: 1980-04-22T00:00:00 * Elevation: -3769.0 m * Penetration: 180 m * Recovery: 61.4 m * Location: South Atlantic/RIDGE * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 84.5 m cored; 0 m drilled; 72.7 % recovery
73-522B * Latitude: -26.114000 * Longitude: -5.129700 * Date/Time: 1980-05-06T00:00:00 * Elevation: -4441.0 m * Penetration: 170.4 m * Recovery: 26 m * Location: South Atlantic/PLATEAU * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 40.5 m cored; 0 m drilled; 64.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
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Datasets listed in this publication series
- Housden, J; Tucker, P; O'Reilly, W (1984): (Table 2) Geochemistry of titanomagnetite/titanomaghemite grains at DSDP Leg 73 Holes. https://doi.org/10.1594/PANGAEA.811204
- Housden, J; Tucker, P; O'Reilly, W (1984): (Table 3) Magnetic properties at DSDP Leg 73 Holes. https://doi.org/10.1594/PANGAEA.811205
- Housden, J; Tucker, P; O'Reilly, W (1984): (Table 1) Optical properties of opaque minerals at DSDP Leg 73 Holes. https://doi.org/10.1594/PANGAEA.811202
- Housden, J; Tucker, P; O'Reilly, W (1984): (Table 4) Thermomagnetism at DSDP Leg 73 Holes. https://doi.org/10.1594/PANGAEA.811206