Spinel group minerals in metamorphosed ultramafic rocks from Río de Las Tunas belt, Central Andes, Argentina

@inproceedings{Gargiulo2013SpinelGM,
  title={Spinel group minerals in metamorphosed ultramafic rocks from R{\'i}o de Las Tunas belt, Central Andes, Argentina},
  author={Maria Florencia Gargiulo and Ernesto A. Bjerg and Aberra Mogessie},
  year={2013}
}
In the Rio de Las Tunas belt, Central Andes of Argentina, spinel group minerals occur in metaperidotites and in reaction zones developed at the boundary between metaperidotite bodies and their country-rocks. They comprise two types: i) Reddish-brown crystals with compositional zonation characterized by a ferritchromite core surrounded by an inner rim of Cr-magnetite and an outer rim of almost pure magnetite. ii) Green crystals chemically homogeneous with spinel (s.s.) and/or pleonaste… CONTINUE READING

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Origin of the pleonaste-bearing mafic–ultramafic rocks from the Armutlu peninsula, NW Turkey

Mutlu Özkan, Ömer Faruk Çelik
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