Fu, Yanzhe; von Dobeneck, Tilo; Franke, Christine; Heslop, David; Kasten, Sabine (2010): Geochemical data and magnetic measurements of IODP Expedition 308, Hole U1319A from the Gulf of Mexico. PANGAEA, https://doi.org/10.1594/PANGAEA.733404, Supplement to: Fu, Y et al. (2008): Rock magnetic identification and geochemical process models of greigite formation in Quaternary marine sediments from the Gulf of Mexico (IODP Hole U1319A). Earth and Planetary Science Letters, 275(3-4), 233-245, https://doi.org/10.1016/j.epsl.2008.07.034
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A 160 m mostly turbiditic late Pleistocene sediment sequence (IODP Expedition 308, Hole U1319A) from the Brazos-Trinity intraslope basin system off Texas was investigated with paleo- and rock magnetic methods. Numerous layers depleted in iron oxides and enriched by the ferrimagnetic iron-sulfide mineral greigite (Fe3S4) were detected by diagnostic magnetic properties. From the distribution of these layers, their stratigraphic context and the present geochemical zonation, we develop two conceptual reaction models of greigite formation in non-steady depositional environments. The "sulfidization model" predicts single or twin greigite layers by incomplete transformation of iron monosulfides with polysulfides around the sulfate methane transition (SMT). The "oxidation model" explains greigite formation by partial oxidation of iron monosulfides near the iron redox boundary during periods of downward shifting oxidation fronts. The stratigraphic record provides evidence that both these greigite formation processes act here at typical depths of about 12-14 mbsf and 3-4 mbsf. Numerous "fossil" greigite layers most likely preserved by rapid upward shifts of the redox zonation denote past SMT and sea floor positions characterized by stagnant hemipelagic sedimentation conditions. Six diagenetic stages from a pristine magnetite-dominated to a fully greigite-dominated magnetic mineralogy were differentiated by combination of various hysteresis and remanence parameters.
Latitude: 27.266252 * Longitude: -94.403180
Datasets listed in this publication series
- Fu, Y (2010): (Fig. 2c) Total and axial NRM of 8.26 mbsf sample from IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733403
- Fu, Y (2010): (Fig. 5) Kappa arm/SIRM ratio of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733400
- Fu, Y (2010): (Fig. 5) SIRM/kappa ratio of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733401
- Fu, Y (2010): (Fig. 5a) Methane (CH4) content in pore wate of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733342
- Fu, Y (2010): (Fig. 5a) Sulfate (SO4**2-) and iron (Fe**2+) contents in pore water of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733341
- Fu, Y (2010): (Fig. 5a) Total organic carbon in pore water of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733343
- Fu, Y (2010): (Fig. 5b) Greigite-sensitive rock magnetic parameter ARM dem 40mT/ARM 100mT of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733347
- Fu, Y (2010): (Fig. 5b) Greigite-sensitive rock magnetic parameter Delta GRM/Delta NRM of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733345
- Fu, Y (2010): (Fig. 5b) Greigite-sensitive rock magnetic parameter GRM of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733344
- Fu, Y (2010): (Fig. 5c) Remanent coercive field Bcr of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733349
- Fu, Y (2010): (Fig. 8) Hysteresis parameters of IODP Hole 308-U1319A. https://doi.org/10.1594/PANGAEA.733517