Kono, Masaru; Clague, David A; Larson, Edwin E (1980): Reflection microscopy and geochemistry at DSDP Leg 55 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.823371, Supplement to: Kono, M et al. (1980): Fe-Ti oxide mineralogy of DSDP Leg 55 basalts. In: Jackson, ED; Koisumi, I; et al., (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 55, 639-652, https://doi.org/10.2973/dsdp.proc.55.126.1980
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Abstract:
Magnetic properties of volcanic rocks are controlled mainly by the physical and chemical state of their constituent ferromagnetic minerals. The most important parameters determining magnetic properties are concentration, composition, grain size, and oxidation state. In sea floor basalts, the main ferromagnetic minerals are titanomagnetites which are either unoxidized or, more commonly, have undergone various degrees of posteruptive low-temperature oxidation to become cationdeficient titanomagnetites, or titanomaghemites. The effects of this low-temperature alteration are seen in the increase of Curie temperature and decrease of saturation magnetization and lattice parameter of ferromagnetic minerals (Readman and O'Reilly, 1972). It is now believed that titanomaghemitization of newly formed mid-ocean ridge crust proceeds with a time constant of about 1 m.y., accompanying drastic decrease of the intensity of the natural remanent magnetization (NRM) (Johnson and Atwater, 1977).
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 41.366319 * Median Longitude: 170.332481 * South-bound Latitude: 37.988200 * West-bound Longitude: 170.020500 * North-bound Latitude: 44.777200 * East-bound Longitude: 170.597700
Date/Time Start: 1977-08-01T00:00:00 * Date/Time End: 1977-08-16T00:00:00
Event(s):
55-430A * Latitude: 37.988200 * Longitude: 170.597700 * Date/Time: 1977-08-01T00:00:00 * Elevation: -1479.0 m * Penetration: 118 m * Recovery: 18.3 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg55 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 59 m cored; 28.5 m drilled; 31.1 % recovery
55-432A * Latitude: 41.333800 * Longitude: 170.379000 * Date/Time: 1977-08-06T00:00:00 * Elevation: -1310.0 m * Penetration: 74 m * Recovery: 16.1 m * Location: North Pacific/TERRACE * Campaign: Leg55 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 5 cores; 38 m cored; 0 m drilled; 42.4 % recovery
55-433A * Latitude: 44.776700 * Longitude: 170.021000 * Date/Time: 1977-08-16T00:00:00 * Elevation: -1862.0 m * Penetration: 174 m * Recovery: 88.6 m * Location: North Pacific/SEAMOUNT * Campaign: Leg55 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 174 m cored; 0 m drilled; 50.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets
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Datasets listed in this publication series
- Kono, M; Clague, DA; Larson, EE (1980): (Table 4) Geochemistry of Fe-Ti oxides at DSDP Hole 55-430A. https://doi.org/10.1594/PANGAEA.823368
- Kono, M; Clague, DA; Larson, EE (1980): (Table 1) Reflection microscopy of Fe-Ti oxides at DSDP Hole 55-430A. https://doi.org/10.1594/PANGAEA.823364
- Kono, M; Clague, DA; Larson, EE (1980): (Table 5) Geochemistry of Fe-Ti oxides at DSDP Hole 55-432A. https://doi.org/10.1594/PANGAEA.823369
- Kono, M; Clague, DA; Larson, EE (1980): (Table 2) Reflection microscopy of Fe-Ti oxides at DSDP Hole 55-432A. https://doi.org/10.1594/PANGAEA.823365
- Kono, M; Clague, DA; Larson, EE (1980): (Table 6) Geochemistry of Fe-Ti oxides at DSDP Site 55-433. https://doi.org/10.1594/PANGAEA.823370
- Kono, M; Clague, DA; Larson, EE (1980): (Table 3) Reflection microscopy of Fe-Ti oxides at DSDP Site 55-433. https://doi.org/10.1594/PANGAEA.823367