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Mantle peridotites from continental rifts to ocean basins to subduction zones
Bonatti, E.; Michael, P.J. (1989). Mantle peridotites from continental rifts to ocean basins to subduction zones. Earth Planet. Sci. Lett. 91(3-4): 297-311
In: Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X, more
Peer reviewed article  
Available in  Authors 
Keywords
    Chemical elements > Nonmetals > Aluminium
    Chemistry > Geochemistry
    Earth sciences > Geology > Tectonics > Plate tectonics
    Earth structure > Earth mantle
    Minerals > Silicate minerals > Olivine
    Minerals > Silicate minerals > Pyroxenes
    Natural resources > Mineral resources > Mineral deposits > Subsurface deposits > Fuels > Fossil fuels > Petroleum
    Rift zones
    Rocks > Igneous rocks > Ultramafic rocks > Peridotite
    Subduction zones
    Topographic features > Submarine features > Ridges > Submarine ridges > Mid-ocean ridges
    ANE, Portugal [Marine Regions]; ASW, Puerto Rico Trench [Marine Regions]; ISE, Tonga Trench [Marine Regions]; ISEW, Marian Trench [Marine Regions]; ISW, Red Sea, Zabargad; PNE, Norway, Spitsbergen [Marine Regions]; PSE, Australia [Marine Regions]
    Marine/Coastal
Authors  Top 
  • Bonatti, E.
  • Michael, P.J.
Abstract
    Some key parameters for mantle-derived spinel peridotites from the North Atlantic, such as reconstructed primary modal and bulk composition, A12 O3 content of orthopyroxene (opx), Fo content of olivine, and 100 Cr/(Cr + A1) of spinel, have been compared with the same parameters for peridotite bodies from preoceanic rifts (Zabargad Island in the Red Sea), passive ocean margins (Iberian and Spitsbergen margins in the North Atlantic and Southwest Australian margin in the Pacific-Antarctic Ocean) and subduction-related active margins (Mariana, Tonga and Puerto Rico trenches). Going from preoceanic rifts to passive margins to a mature ocean to subduction zones, peridotite bulk and opx A12O3 content and modal clinopyroxene (cpx) content decrease, while olivine Fo, bulk and opx 100 Mg/(Mg + Fe), and spinel 100 Cr/(Cr + A1) increase. These systematic changes, compared with experimental data, suggest an increase of the degree of depletion of the peridotites going from a preoceanic rift to passive margins to mature oceans to subduction-related active margins.
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