Productos de fusión parcial de láminas ofiolíticas subducentes (Cuba oriental)
- C. Lázaro 1
- I.F. Blanco-Quintero 2
- M.A. Iturralde-Vinent 3
- K. Núñez Cambra 4
- Y. Rojas-Agramonte 5
- J. Cárdenas-Párraga 1
- J.A. Proenza 6
- A. Garcia-Casco 1
-
1
Universidad de Granada
info
-
2
Universitat d'Alacant
info
- 3 Academia de Ciencias de Cuba
- 4 Instituto de Geología y Paleontología
- 5 Institut für Geowissenschaften Johannes Gutenberg-Universität Mainz
-
6
Universitat de Barcelona
info
ISSN: 1576-5172
Year of publication: 2021
Issue Title: X Congreso Geológico de España
Issue: 18
Pages: 1055
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The Mayarí-Baracoa Ophiolite, in eastern Cuba, is associated with subduction-related serpentinite matrix mélanges (Sierra del Convento and La Corea-Sierra de Cristal) that include blocks of ultrabasic, basic, and sedimentary rocks metamorphosed at high P (Grt-amphibolites, blueschists, antigoritites and zoisite schists). The Grt-amphibolites (MORB-derived) formed early in the subduction history (ca. 120 Ma) and reached water-saturated partial melting at 700-750ºC and 1.5GPa, indi- cating a very hot-subduction scenario related to subduction of very young oceanic lithosphere-ridge. The primary liquids formed normal low-K (phengite-free) trondhjemites derived from normal MORB protoliths and did not significantly react with the mantle wedge or other subducted lithologies. However, high-K-Ba (phengite-bearing) trondhjemites indicate that the partial melting processes in the subducting slab were triggered by infiltration of fluids derived from distinct subducted sources, including juvenile material (hydrated meta-MORB +/- hydrated metaharzburgite) and metasediments. The melting products compare to adakite and TTG compositions, pointing to common formation processes.