Petrography, chemistry and magnetic properties of ODP Leg 115 basalts
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
1990
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| _version_ | 1867171360739950592 |
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| author | Hargraves, Robert B |
| author_facet | Hargraves, Robert B |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_755770 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Petrography, chemistry and magnetic properties of ODP Leg 115 basalts Hargraves, Robert B 115-706C; 115-707C; 115-713A; 115-715A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean 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. |
| title | Petrography, chemistry and magnetic properties of ODP Leg 115 basalts |
| topic | 115-706C; 115-707C; 115-713A; 115-715A; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Lakshadweep Sea; Leg115; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean |
| url | https://doi.org/10.1594/PANGAEA.755770 |