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Savelyeva, G N; Bortnikov, Nikolay S; Peyve, Alexander A; Skolotnev, Sergey G (2006): Composition of minerals and rocks from the Markov Deep, Central Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.746013, Supplement to: Savelyeva, GN et al. (2006): Ultramafic rocks from the Markov Deep: rift valley of the Mid-Atlantic Ridge. Geokhimiya (Geochemistry), No 11, 1192-1208

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Abstract:
The paper presents materials on composition and texture of weakly serpentinized ultrabasic rocks from the western and eastern walls of the Markov Deep (5°30.6'-5°32.4'N) in the rift valley of the Mid-Atlantic Ridge. Predominant harzburgites with protogranular and porphyroclastic textures contain two major generations of minerals: the first generation composes the bulk of rocks and consists of Ol_89.8-90.4 + En_90.2-90.8 + Di_91.8 + Chr (Cr#32.3-36.6, Mg#67.2-70.0), while the second generation composes very thin branching veinlets and consists of PlAn_32-47 + Ol_74.3-77.1 + Opx_55.7-71.9 + Cpx_67.5 + Amph_53.7-74.2 + Ilm. Syndeformational olivine neoblasts in recrystallization zones are highly magnesian. Concentrations and covariations of major elements in harzburgites indicate that these rocks are depleted in mantle residues (high Mg# of minerals and whole-rock samples and low in CaO, Al2O3, and TiO2) that are significantly enriched in trace HFSE and REE (Zr, Hf, Y, LREE, and all REE). Mineralogy and geochemistry of harzburgites were formed by interaction of mantle residues with hydrous, strongly fractionated melts that impregnated them. Mineral composition of veinlets in harzburgites and mineralogical-geochemical characteristics of related plagiogranites and gabbronorites suggest that these plagiogranites were produced by melt residuals after crystallization of gabbronorites. Modern characteristics of harzburgites were shaped by the following processes: (i) partial melting of mantle material simultaneously with its subsolidus deformations, (ii) brittle-plastic deformations associated with cataclastic flow and recrystallization, and (iii) melt percolation along zones of maximal stress relief and interaction of this melt with magnesian mantle residue.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 5.910109 * Median Longitude: -33.173961 * South-bound Latitude: 5.908300 * West-bound Longitude: -33.188300 * North-bound Latitude: 5.911700 * East-bound Longitude: -33.158300
Event(s):
I1063 * Latitude Start: 5.908300 * Longitude Start: -33.166700 * Latitude End: 5.911700 * Longitude End: -33.160000 * Elevation Start: -3900.0 m * Elevation End: -3600.0 m * Location: Mid-Atlantic Ridge * Campaign: Ioffe-10 * Basis: Akademik Ioffe * Method/Device: Dredge (DRG)
I1068 * Latitude Start: 5.911700 * Longitude Start: -33.188300 * Latitude End: 5.910000 * Longitude End: -33.168300 * Elevation Start: -4680.0 m * Elevation End: -4020.0 m * Location: Mid-Atlantic Ridge * Campaign: Ioffe-10 * Basis: Akademik Ioffe * Method/Device: Dredge (DRG)
I1069 * Latitude Start: 5.910000 * Longitude Start: -33.163300 * Latitude End: 5.908300 * Longitude End: -33.158300 * Elevation Start: -3800.0 m * Elevation End: -3640.0 m * Location: Mid-Atlantic Ridge * Campaign: Ioffe-10 * Basis: Akademik Ioffe * Method/Device: Dredge (DRG)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 1) Composition of olivine in ultramafic rocks and gabbro (1069-24) from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746004
  2. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 2) Composition of orthopyroxenes in ultramafic rocks from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746005
  3. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 3) Composition of clinopyroxene and amphibole in ultramafic rocks and gabbro (1069-24) from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746007
  4. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 4) Composition of ore minerals in ultramafic rocks from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746009
  5. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 6) Concentrations of trace elements in ultramafic rocks from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746008
  6. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 5) Bulk-rock composition of ultramafic rocks and gabbro from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746010
  7. Savelyeva, GN; Bortnikov, NS; Peyve, AA et al. (2006): (Table 7) Concentrations of rare earth elements in ultramafic rocks from the Markov Deep, Central Atlantic. https://doi.org/10.1594/PANGAEA.746012