Magnetic properties and chemical composition at DSDP Hole 77-538A
| Cobertura |
LATITUDE: 23.849200 * LONGITUDE: -85.165500 * DATE/TIME START: 1981-01-14T00:00:00 * DATE/TIME END: 1981-01-14T00:00:00 |
|---|---|
| Data(s) |
03/04/1984
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| Resumo |
Magnetic properties of doleritic and some metamorphic basement rocks underlying Catoche Knoll are studied. Doleritic rocks show a high saturation magnetic moment (2-5 emu/g) compared to metamorphic rocks (0.1-1 emu/g). Magnetic minerals of rocks from this hole show a high stability when heated in vacuo up to 600°C at a fixed rate of heating. Curie temperatures are distributed close to 550°C. These properties differ markedly from those of common submarine basalts observed before. X-ray microprobe analysis techniques were used to determine internal structures of ferromagnetic minerals; in most of ferromagnetic minerals there exist two different types of magnetic phases (i.e., products of high-temperature and low-temperature oxidations). Interpretations on the coexisting, seemingly contradictory, phases can be made based upon present analyses. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.809673 doi:10.1594/PANGAEA.809673 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Furuta, Toshio; Kinoshita, Hajimu (1984): Magnetic properties of basement rock samples from Catoche Knoll, Gulf of Mexico, Deep Sea Drilling Project Leg 77. In: Buffler, RT; Schlager, W; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 77, 515-523, doi:10.2973/dsdp.proc.77.118.1984 |
| Palavras-Chave | ## - shipboard measurements; 77-538A; Al2O3; Aluminium oxide; Atomic mole ratio; Chromium(III) oxide; Comment; Cr2O3; Curie temp; Curie temperature; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; During cooling; ? means that, because the magnetic moment of this sample is very weak, we could not precisely determine the type or temperature; During heating; ? means that, because the magnetic moment of this sample is very weak, we could not precisely determine the type or temperature; Electron microprobe; FeO; Glomar Challenger; Grain size, mean; gs mean; Gulf of Mexico/KNOLL; ID; Identification; Iron oxide, FeO; Is; kappa; Label; Leg77; Magnesium oxide; Manganese oxide; Measured; MgO; MnO; Natural remanent magnetization; Nickel oxide; NiO; No; NRM; Number; ODP sample designation; Ratio; Ratio of saturation magnetization observed at room temperature after and before heating; Rock fragm; Rock fragments; Sample code/label; Silicon dioxide; SiO2; Specific saturation magnetization; Susceptibility, volume; Temperature dependence of saturation magnetization; Parentheses indicate atypical curves; Thermomagnetic balance; Ti/Fe; TiO2; Titanium/Iron ratio; Titanium oxide; Total; Total iron; Type; V2O3; Vanadium(III) oxide; x value in the formula Fe2 TiO4 |
| Tipo |
Dataset |
