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Sharkov, E V; Bortnikov, Nikolay S; Zinger, T F; Chistyakov, A V (2005): Chemical composition of minerals and rocks from the Sierra Leone segment of the Mid-Atlantic Ridge and from the Markov depression, Central Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745121, Supplement to: Sharkov, EV et al. (2005): Silicic Fe-Ti-oxide series of slow-spreading ridges: petrology, geochemistry, and genesis with reference to the Sierra Leone segment of the Mid-Atlantic Ridge axial zone at 6°N. Russian Journal of Earth Sciences, 7(4), 1-30

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Abstract:
Silicic Fe-Ti-oxide magmatic series was the first recognized in the Sierra Leone axial segment of the Mid-Atlantic Ridge near 6°N. The series consists of intrusive rocks (harzburgites, lherzolites, bronzitites, norites, gabbronorites, hornblende Fe-Ti-oxide gabbronorites and gabbronorite-diorites, quartz diorites, and trondhjemites) and their subvolcanic (ilmenite-hornblende dolerites) and, possibly, volcanic analogues (ilmenite-bearing basalts). Deficit of most incompatible elements in the rocks of the series suggests that parental melts derived from a source that had already been melted. Correspondingly, these melts could not be MORB derivatives. Origin of the series is thought to be related to melting of the hydrated oceanic lithosphere during emplacement of an asthenospheric plume (protuberance on the surface of large asthenospheric lens beneath MAR). Genesis of different melts was supposedly controlled by ascent of a chamber of hot mantle magmas thought this lithosphere in compliance with the zone melting mechanism. Melt acquired fluid components from heated rocks at peripheries of the plume and became enriched in Fe, Ti, Pb, Cu, Zn, and other components mobile in fluids.
Project(s):
Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 6.178156 * Median Longitude: -33.359636 * South-bound Latitude: 5.811167 * West-bound Longitude: -33.821700 * North-bound Latitude: 6.676700 * East-bound Longitude: -33.056700
Event(s):
I1026 * Latitude Start: 6.348300 * Longitude Start: -33.536700 * Latitude End: 6.365000 * Longitude End: -33.516700 * Elevation Start: -3870.0 m * Elevation End: -2600.0 m * Location: Mid-Atlantic Ridge * Campaign: Ioffe-10 * Basis: Akademik Ioffe * Method/Device: Dredge (DRG)
I1027 * Latitude Start: 6.355000 * Longitude Start: -33.570000 * Latitude End: 6.383300 * Longitude End: -33.570000 * Elevation Start: -3200.0 m * Elevation End: -2750.0 m * Location: Mid-Atlantic Ridge * Campaign: Ioffe-10 * Basis: Akademik Ioffe * Method/Device: Dredge (DRG)
I1028 * Latitude Start: 6.261700 * Longitude Start: -33.396700 * Latitude End: 6.268300 * Longitude End: -33.396700 * Elevation Start: -3800.0 m * Elevation End: -3400.0 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:
9 datasets

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Datasets listed in this publication series

  1. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 2) Representative analyses of olivine in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745089
  2. Zinger, TF; Chistyakov, AV (2005): (Table 3) Representative analyses of pyroxenes in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745091
  3. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 4) Representative analyses of plagioclase in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745092
  4. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 5) Representative analyses of kaersutite in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745093
  5. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 6) Representative analyses of Cr-spinel in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745116
  6. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 7) Representative analyses of Fe-Ti oxides and apatite in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745117
  7. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 9) U-Pb isotopic dating of zircons from cataclased hornblende gabbronorite of the Markov depression, Central Atlantic. https://doi.org/10.1594/PANGAEA.745118
  8. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 10) Major element contents in rocks from the Sierra Leone segment of the Mid-Atlantic Ridge. https://doi.org/10.1594/PANGAEA.745119
  9. Sharkov, EV; Bortnikov, NS; Zinger, TF et al. (2005): (Table 11) Trace element and REE contents in rocks from the Markov depression, Central Atlantic. https://doi.org/10.1594/PANGAEA.745120