Ross, Kent; Elthon, Don (1993): (Table 1) Composition of DSDP Hole 37-334 clinopyroxenes [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.769881, Supplement to: Ross, K; Elthon, D (1993): Cumulates from strongly depleted mid-ocean-ridge basalt. Nature, 365(6449), 826-829, https://doi.org/10.1038/365826a0
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Abstract:
Recent studies of abyssal peridotites (Johnson et al., 1990, doi:10.1029/JB095iB03p02661), mid-ocean-ridge basalts (MORBs) (McKenzie, 1985, doi:10.1016/0012-821X(85)90001-9) and their entrained melt inclusions (Sobolev and Shimizu, 1993, doi:10.1038/363151a0; Humler and Whitechurch, 1988, doi:10.1016/0012-821X(88)90055-6) have shown that fractional melting of the upwelling sub-oceanic mantle produces magmas with a much wider range of compositions than erupted MORBs. In particular, it seems that strongly depleted primary magmas are routinely produced by melting beneath ridges (Johnson et al., 1990, doi:10.1029/JB095iB03p02661). The absence of strongly depleted melts as erupted lavas prompts the question of how long such magmas survive beneath ridges, before their distinctive compositions are concealed by mixing with more enriched magmas. Here we report mineral compositions from a unique suite of oceanic cumulates recovered from DSDP Site 334 (Aumento et al., doi:10.2973/dsdp.proc.37.1977), which indicate that the rocks crystallized from basaltic liquids that were strongly depleted in Na, Ti, Zr, Y, Sr and rare-earth elements relative to any erupted MORB. It thus appears that the magmatic plumbing system beneath the Mid-Atlantic Ridge permitted strongly depleted magmas to accumulate in a magma chamber and remain sufficiently isolated to produce cumulate rocks. Even so, spatial heterogeneity in the compositions of high-calcium pyroxenes suggests that in the later stages of solidification these rocks reacted with infiltrating enriched basaltic liquids.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 37.035500 * Longitude: -34.414500
Date/Time Start: 1974-07-14T00:00:00 * Date/Time End: 1974-07-14T00:00:00
Minimum Elevation: -2619.0 m * Maximum Elevation: -2619.0 m
Event(s):
37-334 * Latitude: 37.035500 * Longitude: -34.414500 * Date/Time: 1974-07-14T00:00:00 * Elevation: -2619.0 m * Penetration: 376.5 m * Recovery: 98.1 m * Location: North Atlantic/BASIN * Campaign: Leg37 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 253 m cored; 0 m drilled; 38.8 % recovery
Comment:
Analytical uncertainties: Er, Yb, Sr, Zr 12-15%, Ce Nd, Sm, Eu 20 %, La 35%, Ti, V, Cr 1.5-2%, Y 5%.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Ross, Kent | DSDP/ODP/IODP sample designation | ||
| 2 | Lithology/composition/facies | Lithology | Ross, Kent | |||
| 3 | Sample code/label 2 | Sample label 2 | Ross, Kent | Grain designation indicate number of grains analysed in each sample. c = nearest core, i = intermediate location between the center and the rim of the grain. | ||
| 4 | Magnesium number | Mg# | Ross, Kent | Mean Mg# in cpx are averages og 8-10 microprobe analyses per sample. | ||
| 5 | Lanthanum | La | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 6 | Cerium | Ce | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 7 | Neodymium | Nd | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 8 | Samarium | Sm | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 9 | Europium | Eu | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 10 | Dysprosium | Dy | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 11 | Erbium | Er | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 12 | Ytterbium | Yb | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 13 | Titanium | Ti | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 14 | Vanadium | V | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 15 | Chromium | Cr | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 16 | Strontium | Sr | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 17 | Yttrium | Y | mg/kg | Ross, Kent | Electron microprobe (EMP) | |
| 18 | Zirconium | Zr | mg/kg | Ross, Kent | Electron microprobe (EMP) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
252 data points