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Keller, Randall A; Fisk, Martin R; White, William M (2000): (Table 1) Isotopic and trace-element ratios of Emperor Seamount basalts. PANGAEA,, Supplement to: Keller, RA et al. (2000): Isotopic evidence for Late Cretaceous plume-ridge interaction at the Hawaiian hotspot. Nature, 405(6787), 673-676,

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When a mantle plume interacts with a mid-ocean ridge, both are noticeably affected. The mid-ocean ridge can display anomalously shallow bathymetry, excess volcanism, thickened crust, asymmetric sea-floor spreading and a plume component in the composition of the ridge basalts (Schilling, 1973, doi:10.1038/242565a0; Verma et al., 1983, doi:10.1038/306654a0; Ito and Lin, 1995, doi:10.1130/0091-7613(1995)023<0657:OSCHIC>2.3.CO;2; Müller et al., 1998, doi:10.1038/24850). The hotspot-related volcanism can be drawn closer to the ridge, and its geochemical composition can also be affected (Ito and Lin, 1995, doi:10.1130/0091-7613(1995)023<0657:OSCHIC>2.3.CO;2; White et al., 1993, doi:10.1029/93JB02018; Kincaid et al., 1995, doi:10.1038/376758a0; Kingsley and Schilling, 1998, doi:10.1029/98JB01496 ). Here we present Sr–Nd–Pb isotopic analyses of samples from the next-to-oldest seamount in the Hawaiian hotspot track, the Detroit seamount at 51° N, which show that, 81 Myr ago, the Hawaiian hotspot produced volcanism with an isotopic signature indistinguishable from mid-ocean ridge basalt. This composition is unprecedented in the known volcanism from the Hawaiian hotspot, but is consistent with the interpretation from plate reconstructions (Mammerickx and Sharman, 1988, doi:10.1029/JB093iB04p03009) that the hotspot was located close to a mid-ocean ridge about 80 Myr ago. As the rising mantle plume encountered the hot, low-viscosity asthenosphere and hot, thin lithosphere near the spreading centre, it appears to have entrained enough of the isotopically depleted upper mantle to overwhelm the chemical characteristics of the plume itself. The Hawaiian hotspot thus joins the growing list of hotspots that have interacted with a rift early in their history.
Median Latitude: 50.108925 * Median Longitude: 167.709775 * South-bound Latitude: 44.777200 * West-bound Longitude: 164.713500 * North-bound Latitude: 53.009500 * East-bound Longitude: 170.020500
Date/Time Start: 1971-08-30T00:00:00 * Date/Time End: 1992-08-25T17:30:00
Minimum Elevation: -3836.0 m * Maximum Elevation: -1874.0 m
145-883F * Latitude: 51.198400 * Longitude: 167.768100 * Date/Time Start: 1992-08-16T18:45:00 * Date/Time End: 1992-08-20T04:30:00 * Elevation: -2397.0 m * Penetration: 849.4 m * Recovery: 13.58 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 29.4 m cored; 0 m drilled; 46.2 % recovery
145-884C * Latitude: 51.450600 * Longitude: 168.337000 * Date/Time Start: 1992-08-24T11:00:00 * Date/Time End: 1992-08-25T17:30:00 * Elevation: -3836.0 m * Penetration: 357.8 m * Recovery: 294.56 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 357.8 m cored; 0 m drilled; 82.3 % recovery
19-192A * Latitude: 53.009500 * Longitude: 164.713500 * Date/Time: 1971-08-30T00:00:00 * Elevation: -3014.0 m * Penetration: 1057 m * Recovery: 37.7 m * Location: North Pacific/GUYOT * Campaign: Leg19 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 47 m cored; 0 m drilled; 80.2 % recovery
All isotopic ratios were measured at Cornell University. All samples were repeatedly leached in hot HCl before digestion, and all isotopic ratios were corrected for fractionation. Sr and Pb isotope ratios are normalized to standards NBS987 ( = 0.710248) and NBS981 ( = 16.937; 15.493; 36.705), respectively. The average 143Nd/144Nd for the La Jolla Nd standard measured at the time of these analyses (via Ames Nd) was 0.511876614. Two-sigma standard errors based on numerous analyses of standards during the time of the unknown runs are: 87Sr/86Sr ± 0.000014, 143Nd/144Nd ± 0.000016, 206Pb/204Pb ± 0.010, 207Pb/204Pb ± 0.011, and 208Pb/204Pb ± 0.030. Within-run standard errors are smaller than these external errors. Trace-element concentrations were measured by isotope dilution thermal ionization mass spectrometry (TIMS-ID) of leached samples (Pb, Th and U) and inductively coupled plasma mass spectrometry (ICP-MS), of unleached samples (Rb, Sr, La, Nd and Sm). The ages of the Site 433 and Site 884 samples are known from 40Ar±39Ar dating (Clagues and Dalrymple, 1987; Lanphere et al., 1980, doi:10.2973/dsdp.proc.55.131.1980). For age correction purposes, the Site 883 samples are assumed to be 1 Myr younger than the Site 884 samples because Site 883 was slightly higher on the seamount, and the Site 883 samples appear to be of transitional composition. The Site 192 sample is estimated to be 85 Myr old for age correction purposes. Errors in the estimated ages of the Site 192 and Site 883 samples of several million years or less are not relevant here.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5Sample code/labelSample labelKeller, Randall AODP sample designation
6AGEAgeka BPGeocode
7Age, commentCommKeller, Randall A
8Strontium 87/Strontium 86 ratio87Sr/86SrKeller, Randall A
9Neodymium 143/Neodymium 144143Nd/144NdKeller, Randall A
10Lead 206/Lead 204 ratio206Pb/204PbKeller, Randall A
11Lead 207/Lead 204 ratio207Pb/204PbKeller, Randall A
12Lead 208/Lead 204 ratio208Pb/204PbKeller, Randall A
13Rubidium/Strontium ratioRb/SrKeller, Randall A
14Samarium/Neodymium ratioSm/NdKeller, Randall A
15Thorium/Lead ratioTh/PbKeller, Randall A
16Uranium/Lead ratioU/PbKeller, Randall A
17Lanthanum/Samarium ratioLa/SmKeller, Randall A
18Strontium 87/Strontium 86 ratio87Sr/86SrKeller, Randall Ainitial
19Neodymium 143/Neodymium 144143Nd/144NdKeller, Randall Ainitial
20Lead 206/Lead 204 ratio206Pb/204PbKeller, Randall Ainitial
21Lead 207/Lead 204 ratio207Pb/204PbKeller, Randall Ainitial
22Lead 208/Lead 204 ratio208Pb/204PbKeller, Randall Ainitial
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