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Murray, Richard W; Leinen, Margaret W (1993): Biogenic components, major, trace and rare earth elements of equatorial Pacific Ocean surface sediments (Table 1). PANGAEA,, Supplement to: Murray, RW; Leinen, MW (1993): Chemical transport to the seafloor of the equatorial Pacific Ocean across a latitudinal transect at 135°W: Tracking sedimentary major, trace, and rare earth element fluxes at the Equator and the Intertropical Convergence Zone. Geochimica et Cosmochimica Acta, 57(17), 4141-4163,

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We have analyzed the major, trace, and rare earth element composition of surface sediments collected from a transect across the Equator at 135°W longitude in the Pacific Ocean. Comparing the behavior of this suite of elements to the CaCO3, opal, and Corg fluxes (which record sharp maxima at the Equator, previously documented at the same sampling stations) enables us to assess the relative significance of the various pathways by which trace elements are transported to the equatorial Pacific seafloor.
The 1. (1) high biogenic source at the Equator, associated with equatorial divergence of surface water and upwelling of nutrient-rich water, and
2. (2) high aluminosilicate flux at 4°N, associated with increased terrigenous input from elevated rainfall at the Intertropical Convergence Zone (ITCZ) of the tradewinds, are the two most important fluxes with which elemental transport is affiliated.
The biogenic flux at the Equator transports Ca and Sr structurally bound to carbonate tests and Mn primarily as an adsorbed component. Trace elements such as Cr, As, Pb, and the REEs are also influenced by the biogenic flux at the Equator, although this affiliation is not regionally dominant. Normative calculations suggest that extremely large fluxes of Ba and P at the Equator are carried by only small proportions of barite and apatite phases.
The high terrigenous flux at the ITCZ has a profound effect on chemical transport to the seafloor, with elemental fluxes increasing tremendously and in parallel with Ti. Normative calculations, however, indicate that these fluxes are far in excess of what can be supplied by lattice-bound terrigenous phases. The accumulation of Ba is greater than is affiliated with biogenic transport at the Equator, while the P flux at the ITCZ is only 10% less than at the Equator. This challenges the common view that Ba and P are essentially exclusively associated with biogenic fluxes. Many other elements (including Mn, Pb, As, and REEs) also record greater accumulation beneath the ITCZ than at the Equator. Thus, adsorptive scavenging by terrigenous paniculate matter, or phases intimately associated with them, appears to be an extremely important process regulating elemental transport to the equatorial Pacific seafloor. These findings emphasize the role of vertical transport to the sediment, and provide additional constraints on the paleochemical use of trace elements to track biogenic and terrigenous fluxes.
Related to:
Isern, Alexandra R (1991): Calcium carbonate and organic carbon accumulation in the Central Equatorial Pacific. MS Thesis, University Thode Island
Martin, William R; Bender, Michael L; Leinen, Margaret W; Orchardo, J (1991): Benthic organic carbon degradation and biogenic silica dissolution in the central equatorial Pacific. Deep-Sea Research Part A. Oceanographic Research Papers, 38(12), 1481-1516,
Fourth Framework Programme (FP4), grant/award no. MAS3970141: Silicon Cycling in the World Ocean
Median Latitude: 1.180769 * Median Longitude: -134.596923 * South-bound Latitude: -14.900000 * West-bound Longitude: -137.520000 * North-bound Latitude: 11.080000 * East-bound Longitude: -132.900000
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
W8803B-T-9 * Latitude: -14.900000 * Longitude: -133.900000 * Elevation: -4312.0 m * Campaign: W8803B * Basis: Wecoma * Method/Device: Gravity corer (GC) * Comment: Tetrahedron cores
W8803B-T-23 * Latitude: -5.980000 * Longitude: -135.000000 * Elevation: -4590.0 m * Campaign: W8803B * Basis: Wecoma * Method/Device: Gravity corer (GC) * Comment: Tetrahedron cores
W8803B-T-31 * Latitude: -2.970000 * Longitude: -135.000000 * Elevation: -4570.0 m * Campaign: W8803B * Basis: Wecoma * Method/Device: Gravity corer (GC) * Comment: Tetrahedron cores
CaCO3 and Corg from Isern (1991), Opal 1 from Martin et al. (1991)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Latitude of eventLatitude
3Longitude of eventLongitude
4Elevation of eventElevationm
5DEPTH, sediment/rockDepth sedmGeocode
6Accumulation rate, massMARg/cm2/kaMurray, Richard W
7Calcium carbonateCaCO3%Isern, Alexandra R
8Opal, biogenic silicabSiO2%Martin, William R
9Opal, biogenic silicabSiO2%Murray, Richard WOpal, normative calculation; Leinen, 1977
10Carbon, organic, totalTOC%Isern, Alexandra R
11Silicon dioxideSiO2%Murray, Richard WX-ray fluorescence (XRF)
12Aluminium oxideAl2O3%Murray, Richard WX-ray fluorescence (XRF)
13Titanium dioxideTiO2%Murray, Richard WX-ray fluorescence (XRF)
14Iron oxide, Fe2O3Fe2O3%Murray, Richard WX-ray fluorescence (XRF)
15Manganese oxideMnO%Murray, Richard WX-ray fluorescence (XRF)
16Calcium oxideCaO%Murray, Richard WX-ray fluorescence (XRF)
17Magnesium oxideMgO%Murray, Richard WX-ray fluorescence (XRF)
18Potassium oxideK2O%Murray, Richard WX-ray fluorescence (XRF)
19Sodium oxideNa2O%Murray, Richard WX-ray fluorescence (XRF)
20Phosphorus pentoxideP2O5%Murray, Richard WX-ray fluorescence (XRF)
21Loss on ignitionLOI%Murray, Richard WX-ray fluorescence (XRF)
22ChromiumCrmg/kgMurray, Richard WX-ray fluorescence (XRF)
23ArsenicAsmg/kgMurray, Richard WX-ray fluorescence (XRF)
24RubidiumRbmg/kgMurray, Richard WX-ray fluorescence (XRF)
25StrontiumSrmg/kgMurray, Richard WX-ray fluorescence (XRF)
26ZirconiumZrmg/kgMurray, Richard WX-ray fluorescence (XRF)
27NiobiumNbmg/kgMurray, Richard WX-ray fluorescence (XRF)
28BariumBamg/kgMurray, Richard WX-ray fluorescence (XRF)
29LeadPbmg/kgMurray, Richard WX-ray fluorescence (XRF)
30LanthanumLamg/kgMurray, Richard WX-ray fluorescence (XRF)
31CeriumCemg/kgMurray, Richard WX-ray fluorescence (XRF)
32PraseodymiumPrmg/kgMurray, Richard WX-ray fluorescence (XRF)
33NeodymiumNdmg/kgMurray, Richard WX-ray fluorescence (XRF)
34SamariumSmmg/kgMurray, Richard WX-ray fluorescence (XRF)
35EuropiumEumg/kgMurray, Richard WX-ray fluorescence (XRF)
36GadoliniumGdmg/kgMurray, Richard WX-ray fluorescence (XRF)
37TerbiumTbmg/kgMurray, Richard WX-ray fluorescence (XRF)
38DysprosiumDymg/kgMurray, Richard WX-ray fluorescence (XRF)
39HolmiumHomg/kgMurray, Richard WX-ray fluorescence (XRF)
40ErbiumErmg/kgMurray, Richard WX-ray fluorescence (XRF)
41ThuliumTmmg/kgMurray, Richard WX-ray fluorescence (XRF)
42YtterbiumYbmg/kgMurray, Richard WX-ray fluorescence (XRF)
43LutetiumLumg/kgMurray, Richard WX-ray fluorescence (XRF)
44Cerium/Cerium ratioCe/CeMurray, Richard WCalculatedCe/Ce*
45Praseodymium/Ytterbium ratioPr/YbMurray, Richard WCalculatedPr(n)/Yb(n)
501 data points

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