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Chen, Tian-Yu; Frank, Martin; Haley, Brian A; Gutjahr, Marcus; Spielhagen, Robert F (2012): (Table 1) Nd-Hf isotopes from leachates and detrital materials of the Arctic sediments. PANGAEA,, Supplement to: Chen, T-Y et al. (2012): Variations of North Atlantic inflow to the central Arctic Ocean over the last 14 million years inferred from hafnium and neodymium isotopes. Earth and Planetary Science Letters, 353-354, 82-92,

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The warm and saline North Atlantic inflow to the Arctic Ocean is a major component of high northern latitude circulation and the main mechanism of deep water renewal in the Arctic Ocean. Knowledge of its past variability is critical for understanding the high latitude feedback mechanisms of the climate system. Here we present the first combined seawater Hf and Nd isotope compositions of past Arctic Intermediate Water extracted from the authigenic Fe?Mn oxyhydroxide fraction of two sediment cores recovered near the North Pole, to reconstruct changes in contributions from glacial brines of the Eurasian shelf and past inflow of Atlantic waters. The Hf and Nd isotopic compositions obtained from leachates of the authigenic fraction show closely coupled and environmentally controlled variations over the past 14 million years. An observed offset of these data from seawater e-Hf and e-Nd compositions from other ocean basins (seawater array) is interpreted as the result of continuously prevailing glacial weathering conditions on the high latitude Eurasian continent. In the late Quaternary, large amplitude Hf and Nd isotopic variations of Arctic Intermediate Water (AIW) was characterized by more radiogenic isotope signatures generally prevailing under glacial conditions and less radiogenic values during interglacial periods. On the basis of the close coupling between Nd and Hf isotopes, we suggest that the evolution of Hf isotope compositions of central Arctic AIW has primarily been controlled by changes in ocean circulation and provenance of weathering inputs, rather than changes in weathering regime.
Related to:
Haley, Brian A; Frank, Martin; Spielhagen, Robert F; Eisenhauer, Anton (2008): Influence of brine formation on Arctic Ocean circulation over the past 15 million years. Nature Geoscience, 1, 68-72,
Median Latitude: 81.086438 * Median Longitude: 111.136229 * South-bound Latitude: 72.093160 * West-bound Longitude: 72.662000 * North-bound Latitude: 88.204000 * East-bound Longitude: 144.166200
Date/Time Start: 1991-08-30T00:00:00 * Date/Time End: 2007-08-30T13:48:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 189.68 m
302-M0002A (ACEX-M2A) * Latitude: 87.921180 * Longitude: 139.365010 * Date/Time: 2004-08-19T00:00:00 * Elevation: -1209.0 m * IGSN: IBCR0302RHTS001 * Penetration: 270.1 m * Recovery: 214.68 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking
302-M0004C (ACEX-M4C) * Latitude: 87.867750 * Longitude: 136.189680 * Date/Time: 2004-09-03T00:00:00 * Elevation: -1287.9 m * IGSN: IBCR0302RHXS001 * Penetration: 37.33 m * Recovery: 25.6 m * Location: Arctic Ocean * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: Vidar Viking
BP97-12 * Latitude: 72.170333 * Longitude: 74.293667 * Date/Time: 1997-09-15T01:06:00 * Elevation: -13.0 m * Location: Kara Sea * Campaign: BP97 (KaraSea97) * Basis: Akademik Boris Petrov * Method/Device: Sampling gear, diverse (DIVERSE) * Comment: CTD-1,RS-3,LVS-3,OG-3,LBC-1,MUC-2
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventChen, Tian-Yu
2Sample code/labelSample labelChen, Tian-Yu
3CommentCommentChen, Tian-Yu
4Latitude of eventLatitudeChen, Tian-Yu
5Longitude of eventLongitudeChen, Tian-Yu
6Elevation of eventElevationmChen, Tian-Yu
7DEPTH, sediment/rockDepthmChen, Tian-YuGeocode
8AGEAgeka BPChen, Tian-YuGeocode
9Neodymium 143/Neodymium 144143Nd/144NdChen, Tian-YuLeachate
10Neodymium 143/Neodymium 144, standard deviation143Nd/144Nd std dev±Chen, Tian-Yu2 sigma
11ε-Neodymiumε-NdChen, Tian-Yu
12ε-Neodymiumε-NdHaley, Brian Acomparison with previously published neodymium isotope data from Haley et al. (2008)
13Hafnium 176/Hafnium 177176Hf/177HfChen, Tian-YuLeachate
14Hafnium 176/Hafnium 177, standard deviation176Hf/177Hf std dev±Chen, Tian-Yu2 sigma
15ε-Hafniumε-HfChen, Tian-Yu
16Neodymium 143/Neodymium 144143Nd/144NdChen, Tian-YuDetrital
17Neodymium 143/Neodymium 144, standard deviation143Nd/144Nd std dev±Chen, Tian-Yu2 sigma, Detrital
18ε-Neodymiumε-NdChen, Tian-YuDetrital
19Hafnium 176/Hafnium 177176Hf/177HfChen, Tian-YuDetrital
20Hafnium 176/Hafnium 177, standard deviation176Hf/177Hf std dev±Chen, Tian-Yu2 sigma, Detrital
21ε-Hafniumε-HfChen, Tian-YuDetrital
522 data points

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