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  • 1
    Call number: 13/ZSP-607(153)
    In: Proceedings of the ocean drilling program
    Type of Medium: Series available for loan
    Pages: XIX, 577 S. , Ill., graph. Darst. , 1 CD-ROM
    Series Statement: Proceeedings of the Ocean Drilling Program : Scientific results 153
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Call number: 13/ZSP-608(178)
    In: Proceedings of the ocean drilling program [Elektronische Ressource]
    Type of Medium: Series available for loan
    Pages: 1 CD-ROM , CD-ROM (12 cm), Booklet (XVII, 60 S.), Site Map, User Guide , 12 cm
    Series Statement: Proceedings of the ocean drilling program [Elektronische Ressource] : Initial reports 178.1998
    Note: Erscheinungsjahr in Vorlageform:1999
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 327 (1987), S. 610-612 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Previous experiments on the directional properties of CRM produced by the direct precipitation of a magnetic mineral from solution have been inconclusive3"7. Chemical remanence produced by the alteration of a magnetic parent mineral may be parallel to the field during alteration7'8, may be parallel ...
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1990-01-01
    Print ISSN: 0031-9201
    Electronic ISSN: 1872-7395
    Topics: Geosciences , Physics
    Published by Elsevier
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  • 5
    Publication Date: 1990-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
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  • 6
    Publication Date: 1987-06-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 7
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    In:  Supplement to: Ali, Jason Richard; Haston, Roger B; Stokking, Laura B (1992): Magnetostratigraphy of Sites 782, 783, 784, and 786, Izu-Bonin Outer Forearc, western Pacific. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 547-560, https://doi.org/10.2973/odp.proc.sr.125.155.1992
    Publication Date: 2024-01-09
    Description: During Leg 125, scientists drilled Sites 782, 783, 784, and 786 across a transect of the Izu-Bonin forearc near 31°N. Magnetostratigraphy for whole-core and discrete specimens has been integrated with biostratigraphic data and correlated to the geomagnetic polarity time scale. These correlations are good back to the middle Miocene at Sites 783, 784, and 786 and to the late Oligocene at Site 782, but become more tentative in older sediments because of poor recovery and complex magnetizations.
    Keywords: 125-782A; 125-783A; 125-784A; 125-786A; DRILL; Drilling/drill rig; Joides Resolution; Leg125; North Pacific Ocean; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    In:  Supplement to: Stokking, Laura B; Merrill, Dean L; Haston, Roger B; Ali, Jason Richard; Saboda, Kristine L (1992): Rock magnetic studies of serpentinite seamounts in the Mariana and Izu-Bonin regions. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 561-579, https://doi.org/10.2973/odp.proc.sr.125.158.1992
    Publication Date: 2024-01-09
    Description: During Leg 125, scientists drilled two serpentinite seamounts: Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu-Bonin forearc. Grain densities of the serpentinized peridotites range from 2.44 to 3.02 g/cm**3. The NRM intensity of the serpentinized peridotites ranges from 0.01 to 0.59 A/m and that of serpentine sediments ranges from 0.01 to 0.43 A/m. Volume susceptibilities of serpentinized peridotites range from 0.05 * 10**-3 SI to 9.78 * 10**-3 SI and from 0.12 * 10**-3 to 4.34 * 10**-3 SI in the sediments. Koenigsberger ratios, a measure of the relative contributions of remanent vs. induced magnetization to the magnetic anomaly, vary from 0.09 to 80.93 in the serpentinites and from 0.06 to 4.74 in the sediments. The AF demagnetization behavior of the serpentinized peridotites shows that a single component of remanence (probably a chemical remanence carried by secondary magnetite) can be isolated in many samples that have a median destructive field less than 9.5 mT. Multiple remanence components are observed in other samples. Serpentine sediments exhibit similar behavior. Comparison of the AF demagnetization of saturation isothermal remanence and NRM suggests that the serpentinized peridotites contain both single-domain and multidomain magnetite particles. The variability of the magnetic properties of serpentinized peridotites reflects the complexity of magnetization acquired during serpentinization. Serpentinized peridotites may contribute to magnetic anomalies in forearc regions.
    Keywords: 125-778A; 125-779A; 125-780C; 125-784A; DRILL; Drilling/drill rig; Joides Resolution; Leg125; North Pacific Ocean; Ocean Drilling Program; ODP
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    Format: application/zip, 2 datasets
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  • 9
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    In:  Supplement to: Stokking, Laura B; Heise, Elizabeth A; Pariso, Janet E; Allerton, Simon A (1995): Data report: Magnetic mineralogy, major- and trace-element geochemistry, and rock magnetic properties of Hole 504B upper crustal rocks. In: Erzinger, J; Becker, K; Dick, HJB; Stokking, LB (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 137, 327-337, https://doi.org/10.2973/odp.proc.sr.137140.029.1995
    Publication Date: 2024-01-09
    Description: Leg 140 of the Ocean Drilling Program deepened Hole 504B to a total depth of 2000.4 m below seafloor (mbsf), making it the deepest hole drilled into ocean crust. Site 504, south of the Costa Rica Rift, is considered the most important in-situ reference section for the structure of shallow ocean crust. We present the results of studies of magnetic mineralogy and magnetic properties of Hole 504B upper crustal rocks recovered during Legs 137 and 140. Results from this sample set are consistent with those discussed in Pariso et al. (this volume) from Legs 111, 137, and 140. Coercivity (Hc) ranges from 5.3 to 27.7 mT (mean 12 mT), coercivity of remanence (HCR) ranges from 13.3 to 50.6 mT (mean 26 mT), and the ratio HCR/HC ranges from 1.6 to 3.19 (mean 2.13). Saturation magnetization (JS) ranges from 0.03 to 5.94 * 10**-6 Am**2, (mean 2.52 * 10**-6 Am**2), saturation remanence (JR) ranges from 0.01 to 0.58 * 10**-6 Am2 (mean 0.37 * 10**-6 Am**2), and the ratio JR/JS ranges from 0.08 to 0.29 (mean 0.16), consistent with pseudo-single-domain behavior. Natural remanent magnetization (NRM) intensity ranges from 0.029 to 7.18 A/m (mean 2.95 A/m), whereas RM10 intensity varies only from 0.006 to 4.8 A/m and has a mean of only 1.02 A/m. Anhysteretic remanent magnetization (ARM) intensity ranges from 0.04 to 6.0 A/m, with a mean of 2.46 A/m, and isothermal remanent magnetization (IRM) intensity ranges from 0.5 to 1683 A/m, with a mean of 430.7 A/m. Volume susceptibility ranges from 0.0003 to 0.043 SI (mean 0.011 SI). In all samples examined, high-temperature oxidation of primary titanomagnetite has produced lamellae or pods of magnetite and ilmenite. Hydrothermal alteration has further altered the minerals in some samples to a mixture of magnetite, ilmenite, titanite, and a high-titanium mineral (either rutile or anatase). Electron microprobe analyses show that magnetite lamellae are enriched in the trivalent oxides Cr2O3, Al2O3, and V2O5, whereas divalent oxides (MnO and MgO) are concentrated in ilmenite lamellae.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 10
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    In:  Supplement to: Pariso, Janet E; Stokking, Laura B; Allerton, Simon A (1995): Rock magnetism and magnetic mineralogy of a 1-km section of sheeted dikes, Hole 504B. In: Erzinger, J; Becker, K; Dick, HJB; Stokking, LB (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 137, 253-262, https://doi.org/10.2973/odp.proc.sr.137140.028.1995
    Publication Date: 2024-01-09
    Description: Magnetic properties and oxide petrography results are presented from dike samples recovered during Ocean Drilling Program Legs 137 and 140 at Hole 504B on the Costa Rica Rift. Although secondary magnetite is common, the most abundant magnetic phase is low-titanium magnetite produced during oxidation of primary (igneous) titanomagnetite. In general, titanomagnetite grains in the Leg 137/140 dike samples were observed to have experienced substantially higher degrees of high-temperature deuteric oxidation than the upper portion of the dike complex, suggesting a gradual decrease in the rate of cooling with depth. Paleomagnetic measurements indicate that samples recovered during Legs 137 and 140 acquired a component of drilling-induced remanent magnetization. However, stable magnetic inclinations determined after alternating-field demagnetization indicate the direction of the hardest component of magnetization is very near that predicted for this equatorial site (0°). The average intensity of natural remanent magnetization for the entire dike complex is 2.1 A/m, about half that observed for the overlying extrusive basalts. Room temperature rock magnetic measurements indicate that the effective magnetic grain size of the dike samples falls within the region described as pseudo-single domain. Together, these results suggest that the sheeted dike complex sampled at Hole 504B is capable of contributing to the anomaly observed at sea surface.
    Keywords: Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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