/* DATA DESCRIPTION: Citation: König, Iris; Lougear, A; Bruns, P; Gruetzner, Jens; Trautwein, Alfred X; Dullo, Wolf-Christian (2000): (Table T1-2) Proportion of ferrous and ferric iron in ODP Hole 172-1062A sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.787914, Supplement to: König, I et al. (2000): Iron oxidation in sediment cores (Site 1062) during six months of storage in the Ocean Drilling Program archive. In: Keigwin, LD; Rio, D; Acton, GD; Arnold, E (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 172, 1-11, https://doi.org/10.2973/odp.proc.sr.172.214.2000 Abstract: Changes in bulk sediment Fe(II)/Fe(III) ratio and in the distribution of iron among different minerals as a result of Ocean Drilling Program archive storage in the Bremen Core Repository were investigated using Mössbauer spectroscopy. Massive Fe(II) to Fe(III) oxidation, which involved between 24% and 45% of the initial Fe(II), occurred within only 6 months of refrigerated storage. Prior to archive storage, >95% of the Fe(II) in the sediment samples under investigation was structural iron in silicate minerals. Hence, virtually the entire oxidation process took place within silicate mineral lattices, and the sediment mineral assemblage was not changed in this case. Nevertheless, the observed oxidation of the comparatively shielded silicate lattice Fe(II) suggests that Fe(II) bound in authigenic carbonates, phosphates, or sulfides - such as that found in many marine sediments - would likely be oxidized at least as fast. Those minerals, however, would be replaced by Fe(III)-bearing oxides and oxyhydroxides, which implies a change of sediment composition, and thus, of various sediment properties, including the magnetic signal, within a few months of storage. Furthermore, changes in the silicate lattice Fe(II)/Fe(III) ratio during storage, such as those reported here, also signify loss of information. This is because oxidation of the structural Fe(II) upon contact with atmospheric oxygen may occur only inasmuch as the inverse Fe(III)-Fe(II) redox transition has taken place in the seabed. Therefore, the reversible shift, if it were measured under controlled reoxidation in the laboratory, may suggest the chemical stress that was suffered by the iron oxide minerals at the ocean bottom. Concerning Site 1062, this process might help to judge both the authenticity of magnetic field excursion records and the lithostratigraphic value of red lutites at given sediment depths. Although the nature and extent of information loss or alteration during storage depend on sediment type, the reported observations emphasize the need for special sample protection with respect to properties that might be affected. Project(s): Ocean Drilling Program (ODP) (URI: http://www-odp.tamu.edu/) Coverage: LATITUDE: 28.246360 * LONGITUDE: -74.406970 DATE/TIME START: 1997-03-14T10:45:00 * DATE/TIME END: 1997-03-15T23:45:00 MINIMUM DEPTH, sediment/rock: 79.86 m * MAXIMUM DEPTH, sediment/rock: 114.00 m Event(s): 172-1062A * LATITUDE: 28.246360 * LONGITUDE: -74.406970 * DATE/TIME START: 1997-03-14T10:45:00 * DATE/TIME END: 1997-03-15T23:45:00 * ELEVATION: -4763.3 m * Penetration: 180.7 m * Recovery: 181.24 m * LOCATION: Blake-Bahama Outer Ridge, North Atlantic Ocean * CAMPAIGN: Leg172 (URI: https://doi.org/10.2973/odp.proc.ir.172.1998) * BASIS: Joides Resolution (URI: http://www-odp.tamu.edu/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 20 cores; 180.7 m cored; 0 m drilled; 100.3 % recovery Parameter(s): Sample code/label (Sample label) * PI: König, Iris * METHOD/DEVICE: DSDP/ODP/IODP sample designation (URI: hdl:10013/epic.27914.d001) DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * COMMENT: mbsf Age model [ka] (Age model) * PI: König, Iris Sample comment (Sample comment) * PI: König, Iris Iron II, ferrous iron [%] (Fe(II)) * PI: König, Iris * COMMENT: % of total iron Iron III, ferric iron [%] (Fe(III)) * PI: König, Iris * COMMENT: without Fe(III) in hematite; % of total iron Iron III, ferric iron [%] (Fe(III)) * PI: König, Iris * COMMENT: only Fe(III) in hematite; % of total iron License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 144 data points */ Sample label Depth sed [m] (mbsf) Age model [ka] Sample comment Fe(II) [%] (% of total iron) Fe(III) [%] (without Fe(III) in hematite; ...) Fe(III) [%] (only Fe(III) in hematite; % o...) 172-1062A-10H-2,16-18 79.86 654.8 immediately after core retrieval 56.0 35.8 8.2 172-1062A-10H-4,46-48 83.16 684.8 immediately after core retrieval 49.5 50.5 0.0 172-1062A-10H-6,46-48 86.16 711.8 immediately after core retrieval 51.9 37.9 10.2 172-1062A-11H-2,10-12 89.30 764.5 immediately after core retrieval 54.5 39.0 6.5 172-1062A-11H-5,10-12 93.80 798.5 immediately after core retrieval 50.4 39.0 10.6 172-1062A-11H-6,10-12 95.30 818.5 immediately after core retrieval 47.4 52.6 0.0 172-1062A-12H-2,125-127 99.95 893.9 immediately after core retrieval 48.0 41.1 10.9 172-1062A-12H-4,125-127 102.95 923.9 immediately after core retrieval 51.9 48.1 0.0 172-1062A-12H-6,125-127 105.95 965.5 immediately after core retrieval 52.1 47.9 0.0 172-1062A-13H-1,50-52 107.20 980.5 immediately after core retrieval 54.4 45.6 0.0 172-1062A-13H-3,60-62 110.30 1017.0 immediately after core retrieval 48.0 44.8 7.2 172-1062A-13H-5,130-132 114.00 1065.8 immediately after core retrieval 52.5 38.1 9.4 172-1062A-10H-2,16-18 79.86 654.8 after 6 months of ODP archive storage 42.7 49.5 7.8 172-1062A-10H-4,46-48 83.16 684.8 after 6 months of ODP archive storage 32.2 67.8 0.0 172-1062A-10H-6,46-48 86.16 711.8 after 6 months of ODP archive storage 38.4 51.3 10.3 172-1062A-11H-2,10-12 89.30 764.5 after 6 months of ODP archive storage 40.3 54.1 5.6 172-1062A-11H-5,10-12 93.80 798.5 after 6 months of ODP archive storage 38.4 51.3 10.3 172-1062A-11H-6,10-12 95.30 818.5 after 6 months of ODP archive storage 28.3 71.7 0.0 172-1062A-12H-2,125-127 99.95 893.9 after 6 months of ODP archive storage 31.4 58.4 10.2 172-1062A-12H-4,125-127 102.95 923.9 after 6 months of ODP archive storage 28.3 71.7 0.0 172-1062A-12H-6,125-127 105.95 965.5 after 6 months of ODP archive storage 30.8 69.2 0.0 172-1062A-13H-1,50-52 107.20 980.5 after 6 months of ODP archive storage 36.0 64.0 0.0 172-1062A-13H-3,60-62 110.30 1017.0 after 6 months of ODP archive storage 30.2 62.8 7.0 172-1062A-13H-5,130-132 114.00 1065.8 after 6 months of ODP archive storage 38.0 52.9 9.1