Seyler, Monique; Lorand, J-P; Dick, Henry J B; Drouin, Marion (2007): Element composition in various minerlas of ODP Hole 209-1274A peridotites, Mid-Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.668588, Supplement to: Seyler, M et al. (2007): Pervasive melt percolation reactions in ultra-depleted refractory harzburgites at the Mid-Atlantic Ridge, 15°20' N: ODP Hole 1274A. Contributions to Mineralogy and Petrology, 153, 303-319, https://doi.org/10.1007/s00410-006-0148-6
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
ODP Leg 209 Site 1274 mantle peridotites are highly refractory in terms of lack of residual clinopyroxene, olivine Mg# (up to 0.92) and spinel Cr# (~0.5), suggesting high degree of partial melting (>20%). Detailed studies of their microstructures show that they have extensively reacted with a pervading intergranular melt prior to cooling in the lithosphere, leading to crystallization of olivine, clinopyroxene and spinel at the expense of orthopyroxene. The least reacted harzburgites are too rich in orthopyroxene to be simple residues of low-pressure (spinel field) partial melting. Cu-rich sulfides that precipitated with the clinopyroxenes indicate that the intergranular melt was generated by no more than 12% melting of a MORB mantle or by more extensive melting of a clinopyroxene-rich lithology. Rare olivine-rich lherzolitic domains, characterized by relics of coarse clinopyroxenes intergrown with magmatic sulfides, support the second interpretation. Further, coarse and intergranular clinopyroxenes are highly depleted in REE, Zr and Ti. A two-stage partial melting/melt–rock reaction history is proposed, in which initial mantle underwent depletion and refertilization after an earlier high pressure (garnet field) melting event before upwelling and remelting beneath the present-day ridge. The ultra-depleted compositions were acquired through melt re-equilibration with residual harzburgites.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 15.647780 * Longitude: -46.676360
Date/Time Start: 2003-06-15T00:30:00 * Date/Time End: 2003-06-18T21:45:00
Event(s):
209-1274A * Latitude: 15.647780 * Longitude: -46.676360 * Date/Time Start: 2003-06-15T00:30:00 * Date/Time End: 2003-06-18T21:45:00 * Elevation: -3939.8 m * Penetration: 155.8 m * Recovery: 34.65 m * Location: South Atlantic Ocean * Campaign: Leg209 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 155.8 m cored; 0 m drilled; 22.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets
Download Data
Datasets listed in this publication series
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (eTable 3) Average major element compositions of clinopyroxenes of ODP Hole 209-1274A peridotites. https://doi.org/10.1594/PANGAEA.668581
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (eTable 1) Average major element compositions of olivines of ODP Hole 209-1274A peridotites. https://doi.org/10.1594/PANGAEA.668575
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (eTable 2) Average major element compositions of orthopyroxenes of ODP Hole 209-1274A peridotites. https://doi.org/10.1594/PANGAEA.668577
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (Table 2) Reconstructed primary modal compositions of representative ODP Hole 209-1274A peridotites, Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.668574
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (eTable 4) Average major element compositions of spinels of ODP Hole 209-1274A peridotites. https://doi.org/10.1594/PANGAEA.668582
- Seyler, M; Lorand, J-P; Dick, HJB et al. (2007): (eTable 5) Trace element and sodium oxide composition of representative clinopyroxenes from ODP Hole 209-1274A, Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.668584