2026-06-28T04:44:19Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/525042023-08-05T21:36:27Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Escuder Viruete, J.
author
Iriondo, Alexander
author
Premo, W.R.
author
Pérez Estaún, A.
2023-06-20T12:46:54Z
2023-06-20T12:46:54Z
2004
1576-5172
https://hdl.handle.net/20.500.14352/52504
http://www.sociedadgeologica.es/publicaciones_geotemas.html
In parallel to structural and metamorphlc studies, geochronologlcal Investigations have been initiated in eclogites and blueschists from the Samaná Peninsula complex, northern Hispaniola, using Sm-Nd, UPb, Rb-Sr and 40Ar/39Ar methods, to constraint subduction, collision and exhumation processes in the Caribbean-North America plate boundary zone. A garnet-omphacite- whole rock Sm-Nd isochron from eclogite yields an age of 86±47 Ma (l43Nd/l44Ndinitial= 0,512894±0,000057; MSWD=0,00036). Although imprecise, we interpret this age as dating the peak of eclogitic metamorphism and allows us to calculate an initial eNd value of +7,2, which suggests a relatively depleted source for the protolith and that the rock formed in an intra-oceanic island-arc setting without significant influence from continental crust. Whole rock trace elements and REE data and preliminary Pb and Rb-Sr analyses also support this interpretation. The 40Ar/39Ar analyses of phengite mineral separates from eclogite and blueschist were made to record the cooling age during retrograde metamorphism (Tc»325-3009C). Phengites of eclogite and blueschist yields average plateau ages of 36,30±0,l 3 Ma and 33,85±0,12 Ma, respectively. These Late Eocene to Early Oligocène ages are related to the regional exhumation of the high-P basement complex and are attributed to the initial oblique collision of the Bahama Platform beneath the Hispaniola arc.
spa
Datos geocronológicos preliminares de la colisión entre el Gran Arco-Isla Caribeño y la Plataforma Continental de Bahamas en el Segmento de La Española
journal article
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https://docta.ucm.es/bitstreams/685c9222-ac5b-44e7-a9a8-83c63ff2cc12/download
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Páginas desdeGeo_temas_6_1sge-9.pdf
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https://docta.ucm.es/bitstreams/c3fc4f8d-3f96-4994-82b3-76c44561a538/download
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7e42f18af7670e3d3e1956723fd25aa5
14686
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Páginas desdeGeo_temas_6_1sge-9.pdf.txt