Characterization of spinel peridotites by olivine-spinel compositional relationships: Review and interpretation

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書誌事項

公開日
1994-04
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/0009-2541(94)90066-3
公開者
Elsevier BV

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説明

Abstract A comprehensive review on igneous petrological characteristics of mantle-derived spinel peridotites was made on the basis of their olivine-spinel compositional relationships. The spinel peridotites (harzburgites and lherzolites), of both massif and xenolithic derivations, plot in a narrow band, the olivine-spinel mantle array, in terms of Fo of olivine and C# ( Cr (Cr+Al) atomic ratio) of chromian spinel. The Cr# of spinel grows rapidly within the olivine-spinel mantle array with a slight increase of Fo. Their Cpx (Opx+Cpx) volume ratio decreases towards the high-Fo, high-Cr# end; it is 0.1 for Cr#=0.5−0.6. Peridotite suites from each tectonic setting lie in a particular part of the olivine-spinel mantle array. The olivine-spinel mantle array possibly consists of integrated FoCr# residual trends formed at various conditions ( P total and P H 2 O ). Cr# of residual spinel coexisting with olivine of a particular Fo increases with a decrease of P total and/or with an increase of P H 2 O on partial melting. Origins of peridotite suites can be constrained to some extent in terms of the FoCr# residual trends, for example, some of the Japan-arc mantle peridotites and fore-arc peridotites are low-pressure and/or hydrous restites, and subcontinental and oceanic hot-spot peridotites are high-pressure and/or anhydrous restites. Fertile alpine-type lherzolites with Cr#≈0.1 are of subcontinental origin. Other alpine lherzolites are most frequently of sub-arc origin, sometimes of sub-ocean floor origin, and rarely of sub-continental origin. Most of the alpine-type harzburgites are of fore-arc origin.

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