Jackson, Trevor A.; Scott, Peter W.
Author Affiliation, Ana.
Department of Geography and Geology
The paleogene volcanic rocks of Cuba and Jamaica: Similarities and differences
Jackson, Trevor A.
Caribbean geology into the third millennium: Transactions of the fifteenth Caribbean Geological Conference
Place of Publication
The University of the West Indies Press
Date of Publication
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Paleogene volcanic lava flows and associated pyroclastic rocks are exposed in eastern Cuba in the Sierra Maestra mountain range, and in eastern Jamaica in the Wagwater Belt of the Port Royal mountain range. In Cuba, the volcanic rocks are contained within the El Cobre Group and comprise basalts, basaltic andesites, andesites and dacites, some of which have been hydrothermally altered. In Jamaica, the volcanic rocks are contained in the Wagwater Group; they are distinctly bimodal in composition, which basalts and dacites being the dominant rock types. Metasomatism is also evident in these rocks, which have been altered to spilites and quartz keratophyres. The volcanic rocks of El Cobre show tholeiitic and calcalkaline characteristics that are typical of an island-arc assemblage. In the Wagwater Group only the dacites are arc-related, whereas the basalts are intra-plate. The presence of intra-plate basalts in the Paleogene island arc of Jamaica, and their absence in Cuba, implies that the evolution of the arc-back arc system in Cuba was different to that of Jamaica, and is a reflection of the tectonic conditions that existed as the Caribbean Plate migrated ENE.....