Hargraves, Robert B (1990): Petrography, chemistry and magnetic properties of ODP Leg 115 basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.755770, Supplement to: Hargraves, RB (1990): Magnetic properties, iron-titanium oxides, and petrology of four Leg 115 basalts. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 103-110, https://doi.org/10.2973/odp.proc.sr.115.127.1990
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Abstract:
A detailed study of the Fe-Ti oxides in four basalt samples-one from each of the four holes drilled into basement on Ocean Drilling Program Leg 115 (Sites 706, 707, 713, and 715) has been performed. Ilmenite is present only in samples from Sites 706 and 715. In the sample from Site 715, Ti-magnetite intergrowths are characteristic of subaerial (?) high-temperature oxy-exsolution; Ti-magnetite in the other three samples has experienced pervasive low-temperature oxidation to Ti-maghemite, as evidenced by the double-humped, irreversible, saturation magnetization vs. temperature (Js/T) curves.
The bulk susceptibility of these samples, which are similar in terms of major element chemistry, varies by a factor of ~20 and correlates semiquantitatively with the modal abundance of Fe-Ti spinel, as determined by image analysis with an electron microprobe. The variation in Fe-Ti oxide abundance correlates with average grain size: fine-grained samples contain less Fe-Ti oxide. This prompts the speculation that the crystallization rate may also influence Fe-Ti oxide abundance.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -3.087800 * Median Longitude: 66.990745 * South-bound Latitude: -13.114000 * West-bound Longitude: 59.016800 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-06-28T07:45:00
Event(s):
115-706C * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-05-26T00:45:00 * Elevation: -2518.0 m * Penetration: 121.7 m * Recovery: 19.72 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 77.4 m cored; 0 m drilled; 25.5 % recovery
115-707C * Latitude: -7.545300 * Longitude: 59.016800 * Date/Time Start: 1987-05-29T10:30:00 * Date/Time End: 1987-06-02T03:30:00 * Elevation: -1552.0 m * Penetration: 443.2 m * Recovery: 91.56 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 259.4 m cored; 0 m drilled; 35.3 % recovery
115-713A * Latitude: -4.193000 * Longitude: 73.394200 * Date/Time Start: 1987-06-16T23:30:00 * Date/Time End: 1987-06-20T09:15:00 * Elevation: -2920.0 m * Penetration: 191.7 m * Recovery: 114.98 m * Location: Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 191.7 m cored; 0 m drilled; 60 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Hargraves, RB (1990): (Table 1) Petrographic properties of ODP Leg 115 basalt samples. https://doi.org/10.1594/PANGAEA.755767
- Hargraves, RB (1990): (Table 3) Chemical analyses of the ODP Leg 115 basalts. https://doi.org/10.1594/PANGAEA.755769
- Hargraves, RB (1990): (Table 2) Magnetic properties of ODP Leg 115 basalt samples. https://doi.org/10.1594/PANGAEA.755768