Abstract

VALDES-MARINO, Yurisley et al. Metamorphosed volcanic ultramafic rocks associated with the Moa-Baracoa ophiolite complex in the Camarioca Sur sector. Min. Geol. [online]. 2019, vol.35, n.3, pp. 252-269. ISSN 1993-8012.

In the Camarioca Sur sector of Moa municipality, exotic blocks of metamorphic rocks that are not related to the common lithology of the ophiolite complex and over which barely any crust develops have been documented. The aim of this study is identifying the textural, structural, and mineralogical features of the component rocks of these blocks to establish their protolith and formation environment. It was found that the protolith of the metamorphic rocks are made of picro-basalt and basalts, revealing for the first time ultramafic volcanic rocks metamorphosed associated with ultramafic rocks of the ophiolite complex in Moa-Baracoa massif. The mantle character of the metamorphosed ultramafic volcanic rocks is based on the existence and contents of the chemical elements: Ni, Cr, Cu, Co, V, Mg and Ti and it is corroborated that the genesis of these basalts has similarity with type MORB and island arcs, supported by the values of relationships between Al2O3/TiO2 and CaO/TiO2 obtained in this study.

Keywords : metamorphism; amphibolite rocks; ophiolite complex; picrobasalts.

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