Petrography, chemistry and magnetic properties of ODP Leg 115 basalts
| Cobertura |
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 |
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| Data(s) |
14/01/1990
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| Resumo |
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. |
| Formato |
application/zip, 3 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.755770 doi:10.1594/PANGAEA.755770 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Hargraves, Robert B (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, doi:10.2973/odp.proc.sr.115.127.1990 |
| Palavras-Chave | #115-706C; 115-707C; 115-713A; 115-715A; Al2O3; Aluminium oxide; Ba; Barium; Calcium oxide; CaO; Chromium; Co; Cobalt; Copper; Cr; Cu; Curie temp; Curie temperature; Depth; DEPTH, sediment/rock; determined by A.N. Baxter; DRILL; Drilling/drill rig; Estimated; Event; Fe2O3; Fe3O4; FeO; Grain size descr; Grain size description; Hysteresis, saturation magnetization; illmenite; illmenite, in µm; ilmenite vs. magnetite abundance could not be resolved quantitatively, and the magnetite contents of samples from Sites 706 and 715 are based on a visual estimate.; Indian Ocean; Inten (NRM); Iron oxide, Fe2O3; Iron oxide, FeO; Jh/Jo = ratio of saturation magnetization after heating to the original; Joides Resolution; K2O; Label; Lakshadweep Sea; Leg115; LOI; Loss on ignition; Magnesium oxide; Magnetite; Manganese oxide; MgO; MnO; Ms; Na2O; Nb; Ni; Nickel; Niobium; NRM, Intensity; Ocean Drilling Program; ODP; ODP sample designation; originally in emu/cm**3 (1 emu/cm**3 = 10**3 A/m); originally in emu/g (1 emu/g=Am**2/kg); Oxides; P2O5; Phosphorus oxide; plagioclase; plagioclase, in µm; Potassium oxide; pyroxene; pyroxene, in µm; Ratio; Rb; Rubidium; Sample code/label; Silicon dioxide; SiO2; Sodium oxide; South Indian Ridge, South Indian Ocean; spinel; spinel, in µm; Sr; Strontium; Sum; Suscept; susceptibility; Susceptibility; Texture; TiO2; Titanium oxide; total iron; V; Vanadium; X-ray fluorescence (XRF); Y; Yttrium; Zinc; Zirconium; Zn; Zr |
| Tipo |
Dataset |
