Abstract
A new jadeitite jade locality has been discovered in the serpentinite-matrix subduction mélange of the Sierra del Convento (eastern Cuba) in a context associated with tectonic blocks of garnet-epidote amphibolite, tonalitic–trondhjemitic epidote gneiss, and blueschist. The mineral assemblages of jadeitite jade and jadeite rocks are varied and include combinations of jadeite, omphacite, albite, paragonite, analcime, clinozoisite-epidote, apatite, phlogopite, phengite, chlorite, glaucophane, titanite, rutile, zircon, and quartz formed during various stages in their P–T evolution. Field relationships are obscure, but some samples made almost exclusively of jadeite show evidence of crystallization from fluid in veins. In one of these samples studied in detail jadeite shows complex textural and chemical characteristics (including oscillatory zoning) that denote growth in a changing chemical medium. It is proposed that interaction of an Al–Na rich fluid with ultramafic rocks produced Al–Na–Mg–Ca fluids of varying composition. Episodic infiltration of these fluids, as a result of episodic opening of the veins, developed oscillatory zoning by direct precipitation from fluid and after reaction of fluid with pre-existing jadeite. The latest infiltrating fluids were richer in Mg–Ca, favouring the formation of omphacite and Mg–Ca rich jadeite in open voids and the replacement of earlier jadeite by fine-grained omphacite + jadeite at 550–560°C. This new occurrence of jadeite in Cuba opens important perspectives for archeological studies of pre-Columbian jade artifacts in the Caribbean region.
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Acknowledgments
We thank two anonymous reviewers for perceptive comments and Dr. Mary Jane Berman for discussion on Caribbean archeological artifacts and for providing an unpublished report on Bahamian jade artifacts by K. R. Johnson. Y. Rojas-Agramonte acknowledges a Humboldt-Foundation Georg Forster Fellowship and a post-doctoral fellowship of the Geocycles Cluster of Mainz University. This is Mainz Geocycles contribution no. 498 and a contribution to IGCP-546 ‘Subduction zones of the Caribbean’. Research for this paper has received financial support from the Spanish Ministerio de Educación y Ciencia project CGL2006-08527/BTE.
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Communicated by H. Keppler.
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García-Casco, A., Rodríguez Vega, A., Cárdenas Párraga, J. et al. A new jadeitite jade locality (Sierra del Convento, Cuba): first report and some petrological and archeological implications. Contrib Mineral Petrol 158, 1–16 (2009). https://doi.org/10.1007/s00410-008-0367-0
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DOI: https://doi.org/10.1007/s00410-008-0367-0