Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6438246 | Geochimica et Cosmochimica Acta | 2014 | 17 Pages |
Abstract
Olivines from the olivine-rich troctolites and the troctolites are distinct by those in the dunites by lower Ni and higher concentrations of Mn and incompatible trace elements (Ti, Zr, Y and HREE). Fractional crystallization cannot reproduce the chemical variations of the olivines from the olivine-rich troctolites and the troctolites. In these rock-types, the olivines commonly show heterogeneous Ti, Zr, Y and HREE compositions, which produce variable Ti/Y and Zr/Y values. We correlate these olivine characteristics with events of reactive melt migration occurred during the formation of the primitive lower oceanic crust. We propose that the migrating melts formed at the mantle-crust transition via interaction with mantle peridotites during periods of low melt supply.
Related Topics
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Geochemistry and Petrology
Authors
Alessio Sanfilippo, Riccardo Tribuzio, Massimo Tiepolo,