Magnetic properties of plutonic rocks at DSDP Leg 82 holes
Cobertura |
MEDIAN LATITUDE: 36.893553 * MEDIAN LONGITUDE: -36.802633 * SOUTH-BOUND LATITUDE: 34.722200 * WEST-BOUND LONGITUDE: -38.842700 * NORTH-BOUND LATITUDE: 38.939700 * EAST-BOUND LONGITUDE: -34.685300 * DATE/TIME START: 1981-09-22T00:00:00 * DATE/TIME END: 1981-10-16T00:00:00 |
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Data(s) |
18/01/1985
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Resumo |
Ten samples of gabbro and peridotite, with varying degrees of serpentinization, were studied by magnetic techniques and reflected light microscopy. Evidence from these methods suggests that the natural remanent magnetization is primarily of chemical origin. It is generally weak for the gabbros and much stronger for the peridotites. This difference is offset by the fact that the peridotites have generally lower magnetic stability and Koenigsberger ratios. There is a considerable variation in both magnetic parameters and petrology even among closely spaced samples, which suggests that some combination of source heterogeneity and tectonic mixing was involved in the production of these rocks. However, the small number of samples makes this conclusion tentative. There may also have been significant postemplacement alteration involved. All samples show a significant anisotropy of weak field susceptibility that appears to be related to deformation. This anisotropy may be useful in defining petrofabrics. |
Formato |
application/zip, 3 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.805578 doi:10.1594/PANGAEA.805578 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Smith, Guy M; Banerjee, Subir K (1985): Magnetic properties of plutonic rocks from the Central North Atlantic Ocean. In: Bougault, H; Cande, SC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 82, 377-383, doi:10.2973/dsdp.proc.82.117.1985 |
Palavras-Chave | ## = indicates the amount of remanence remaining at 1000 Oe.; 3D saturation remanence/3D saturation magnetization; ARM, Intensity, per unit volume; ARM, Intensity/NRM, Intensity ratio; ARM, median destructive field/NRM, median destructive field ratio; ARM, median destructive field of anhysteretic remanent magnetisation; Coercivity; Coercivity of remanence; Comment; Cooling; Curie temp; Curie temperature; Deep Sea Drilling Project; Description; DSDP; Event; Hc; Hcr; Hcr/Hc; Heating; Hysteresis, coercivity of remanence/coercivity; Hysteresis, saturation magnetization; Hysteresis, saturation remanence; Incl; Inclination; Inten (ARM); Inten (ARM)/Inten (NRM); Inten (NRM); JN/0.5XQ; Koenigsberger ratio; Magnetometer; Maximum, unit is emu /(g*Oe); MDF (ARM); MDF (ARM)/MDF (NRM); MDF (NRM); Measured; Minimum, unit is emu /(g*Oe); Mrs; Ms; Msr/Ms; NRM, Intensity; NRM, Median destructive field of natural remanent magnetisation; ODP sample designation; Paramagnetic; unit is 10**-5*emu /(g*Oe); Q-ratio; Ratio; Ratio of final to initial magnetization; Sample code/label; see reference(s); Suscept; Susceptibility; Weak field, unit is emu/(cm**3*Oe) |
Tipo |
Dataset |