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Ito, Takashi; Usui, Akira; Kajiwara, Yoshimichi; Nakano, Takanori (1998): (Table 2) Location, age of accompanied sediments, chemical and Sr isotopic compositions of manganese nodules in DSDP/ODP cores. PANGAEA, https://doi.org/10.1594/PANGAEA.696424, Supplement to: Ito, T et al. (1998): Strontium isotopic compositions and paleoceanographic implication of fossil manganese nodules in DSDP/ODP cores, Leg 1-126. Geochimica et Cosmochimica Acta, 62(9), 1545-1554, https://doi.org/10.1016/S0016-7037(98)00051-9

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Abstract:
Strontium isotopic compositions of acetic acid (HOAc) leachate fractions of eight manganese oxide deposits from the modern seafloor, and of twenty-one buried manganese nodules from Cretaceous to Recent sediments in DSDP/ODP cores were measured. ratios of HOAc leachates in all modern seafloor manganese oxides of various origins are identical with present seawater. The ratios of the HOAc leachates of buried nodules from DSDP/ODP cores are significantly lower than those of nodules from the modern seafloor and are mostly identical with coeval seawater values estimated from the age of associated sediments. It is suggested that the buried nodules in DSDP/ODP cores are not artifacts transported from the present seafloor during the drilling process, but are in situ fossil deposits from the past deep-sea floor during Cretaceous to Quaternary periods. The formation of deep-sea fossil nodules prior to the formation of Antarctic Bottom Water (AABW) indicates that the circulation of oxygenated deep seawaters have activately deposited manganese oxides since the Eocene Epoch, or earlier.
Project(s):
Coverage:
Median Latitude: 13.912936 * Median Longitude: -112.258418 * South-bound Latitude: -51.542000 * West-bound Longitude: 115.541300 * North-bound Latitude: 56.290000 * East-bound Longitude: -19.386100
Date/Time Start: 1969-05-10T00:00:00 * Date/Time End: 1988-07-14T13:00:00
Minimum DEPTH, sediment/rock: 3.5 m * Maximum DEPTH, sediment/rock: 1096.4 m
Event(s):
108-661A * Latitude: 9.446800 * Longitude: -19.386100 * Date/Time Start: 1986-03-17T19:15:00 * Date/Time End: 1986-03-20T19:15:00 * Elevation: -4023.0 m * Penetration: 296.1 m * Recovery: 234.93 m * Location: North Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 32 cores; 296.1 m cored; 0 m drilled; 79.3 % recovery
114-699A * Latitude: -51.542000 * Longitude: -30.677000 * Date/Time Start: 1987-03-20T10:45:00 * Date/Time End: 1987-03-26T15:29:00 * Elevation: -3716.0 m * Penetration: 518.1 m * Recovery: 356.52 m * Location: South Atlantic Ocean * Campaign: Leg114 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 56 cores; 518.1 m cored; 0 m drilled; 68.8 % recovery
122-760A * Latitude: -16.922000 * Longitude: 115.541300 * Date/Time Start: 1988-07-11T23:15:00 * Date/Time End: 1988-07-14T13:00:00 * Elevation: -1981.0 m * Penetration: 284.9 m * Recovery: 196.38 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 284.9 m cored; 0 m drilled; 68.9 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2CommentCommentIto, Takashi
3Latitude of eventLatitude
4Longitude of eventLongitude
5DEPTH, sediment/rockDepthmGeocode
6Sample code/labelSample labelIto, TakashiODP sample designation
7Sample code/label 2Sample label 2Ito, Takashi
8EpochEpochIto, Takashi
9MineralsMineralsIto, Takashi
10Interval commentsInterval commIto, Takashi
11ManganeseMn%Ito, TakashiICP-OES, Inductively coupled plasma - optical emission spectrometrybulk content
12IronFe%Ito, TakashiICP-OES, Inductively coupled plasma - optical emission spectrometryleached with 1% acetic acid
13StrontiumSrmg/kgIto, TakashiICP-OES, Inductively coupled plasma - optical emission spectrometrybulk content
14StrontiumSrmg/kgIto, TakashiICP-OES, Inductively coupled plasma - optical emission spectrometryleached with 1% acetic acid
15RubidiumRbmg/kgIto, TakashiICP-OES, Inductively coupled plasma - optical emission spectrometryleached with 1% acetic acid
16Strontium 87/Strontium 86 ratio87Sr/86SrIto, TakashiMass spectrometer Finnigan MAT 262 RPQ Plusof 1% acetic acid laechates
17Strontium 87/Strontium 86, error87Sr/86Sr e±Ito, TakashiMass spectrometer Finnigan MAT 262 RPQ Plus
Size:
257 data points

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