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Xie, Ruifang C; Marcantonio, Franco (2012): (Table A1) Isotopic ratios of Sr, Nd, and Pb for sediments in ODP Leg 138 sites. PANGAEA, https://doi.org/10.1594/PANGAEA.786410, Supplement to: Xie, RC; Marcantonio, F (2012): Deglacial dust provenance changes in the Eastern Equatorial Pacific and implications for ITCZ movement. Earth and Planetary Science Letters, 317-318, 386-395, https://doi.org/10.1016/j.epsl.2011.11.014

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Abstract:
The provenance of eolian dust supplied to deep-sea sediments has the potential to offer insights into changes in past atmospheric circulation. Specifically, measuring temporal changes in dust provenance can shed light on changes in the mean position of the Intertropical Convergence Zone (ITCZ), a region acting as a barrier separating wind-blown material derived from northern versus southern hemisphere sources. Here we have analyzed Nd, Sr, and Pb isotope ratios in the operationally-defined detrital component extracted from deep-sea sediments in the eastern equatorial Pacific (EEP) along a meridional transect at 110°W from 3°S to 7°N (ODP Leg 138, sites 848–853).
Sr isotope results show that barite Sr has a significant influence on 87Sr/86Sr isotope ratios of samples in the upwelling zone of the EEP. However, sites located >3° or more away from the equator (sites 852 and 853) are believed to not be affected by barite Sr and provide useful detrital Sr signals. 208Pb/206Pb and 207Pb/206Pb ratios in all cores fall into the Pb-isotope space of five potential dust sources (Asia, North and Central/South America, Sahara, and Australia), with no distinct isotopic fingerprinting of the dominant source(s). epsilon-Nd values were most valuable for discerning detrital source provenance, and their values at all sites, ranging from ~5.46 to ~3.25, were more unradiogenic for sediments deposited during the last glacial than for those deposited during the Holocene. There are distinct latitudinal trends in the epsilon-Nd values, with more radiogenic values further south and less radiogenic values further north, excluding site 848. This distinction holds true for both Holocene and last glacial periods. For the most southerly site, 848, we invoke, for the first time, a distinct southern hemisphere Australian source as being responsible for the unradiogenic Nd isotope ratios. Both average last glacial and Holocene epsilon-Nd values show similar sharp gradients along the transect between 5.29°N and 2.77°N, suggesting little movement of the glacial ITCZ in the EEP. However, during the deglacial, this gradient is stronger and shifted further north between 5.29°N and 7.21°N, suggesting a more northerly, possibly stronger, deglacial ITCZ.
Project(s):
Coverage:
Median Latitude: 2.293380 * Median Longitude: -110.319786 * South-bound Latitude: -2.994083 * West-bound Longitude: -110.571633 * North-bound Latitude: 7.210917 * East-bound Longitude: -109.751300
Date/Time Start: 1991-06-04T00:00:00 * Date/Time End: 1991-09-07T00:00:00
Minimum Elevation: -3860.1 m * Maximum Elevation: -3714.1 m
Event(s):
138-848 * Latitude: -2.994083 * Longitude: -110.479983 * Date/Time Start: 1991-06-04T00:00:00 * Date/Time End: 1991-06-06T00:00:00 * Elevation: -3854.7 m * Penetration: 291.3 m * Recovery: 301.9 m * Location: South Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 34 cores; 291.3 m cored; 0 m drilled; 103.6% recovery
138-849 * Latitude: 0.183330 * Longitude: -110.518330 * Date/Time Start: 1991-09-07T00:00:00 * Date/Time End: 1991-06-12T00:00:00 * Elevation: -3839.0 m * Penetration: 791.4 m * Recovery: 777.62 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 83 cores; 786.4 m cored; 0 m drilled; 98.9 % recovery
138-850 * Latitude: 1.297200 * Longitude: -110.521400 * Date/Time Start: 1991-06-12T00:00:00 * Date/Time End: 1991-06-16T00:00:00 * Elevation: -3786.1 m * Penetration: 474 m * Recovery: 470.7 m * Location: North Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 50 cores; 471 m cored; 0 m drilled; 99.9% recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Sample code/labelSample labelXie, Ruifang C
3AGEAgeka BPGeocode
4Strontium 87/Strontium 8687Sr/86SrXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)with DTPA
5Strontium 87/Strontium 86, error87Sr/86Sr e±Xie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)with DTPA
6Strontium 87/Strontium 8687Sr/86SrXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)without DTPA
7Strontium 87/Strontium 86, error87Sr/86Sr e±Xie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)without DTPA
8ε-Neodymiumε-NdXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
9Lead 206/Lead 204 ratio206Pb/204PbXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
10Lead 207/Lead 204 ratio207Pb/204PbXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
11Lead 208/Lead 204 ratio208Pb/204PbXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
12Lead 207/Lead 206 ratio207Pb/206PbXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
13Lead 208/Lead 206 ratio208Pb/206PbXie, Ruifang CThermal Ionization Mass Spectrometry (TIMS)
14NeodymiumNdmg/kgXie, Ruifang CICP-MS, Inductively coupled plasma - mass spectrometrybulk
15NeodymiumNd%Xie, Ruifang C
16ResidualResidual%Xie, Ruifang C
17CommentCommentXie, Ruifang C
Size:
469 data points

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