U-Pb LA-ICP-MS GEOCHRONOLOGY AND GEOCHEMISTRY OF JURASSIC VOLCANIC AND PLUTONIC ROCKS FROM THE PUTUMAYO REGION (SOUTHERN COLOMBIA): TECTONIC SETTING AND REGIONAL CORRELATIONS
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Universidad Industrial de Santander
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Nuevos datos de campo, análisis geoquímicos y U-Pb LA-ICP MS en circón fueron obtenidos en rocas
plutónicas y volcánicas en el Batolito de Mocoa y la Formación Saldaña, en el departamento de Putumayo
en el sur de Colombia. Los resultados sugieren que el volcanismo y plutonismo que compartieron la misma
historia de evolución magmática. Esta asociación vulcano-plutónica muestra enriquecimientos de LILE y
LREE acompañado de anomalías negativas de Nb y Ti característico de arcos continentales. Rocas volcánicas
y plutónicas de este arco continental cristalizaron entre 180 y 186 Ma como lo indica la geocronología U-Pb
en circón. La actividad magmática esta temporal y geoquímicamente correlacionada con otro arco magmático expuesto en Colombia y Ecuador. Estas unidades pueden representar los remanentes de un solo cinturón que incluye varias unidades entre los 4°N en Colombia y 5°S en Ecuador. Este arco está relacionado a un cinturón magmático Jurásico fragmentado, que caracterizo las márgenes continentales de las Américas luego de la ruptura del súper continente Pangea.
New field data, geochemical analyses and zircon U-Pb LA-ICP MS data were obtained on plutonic and volcanic rocks of the Mocoa Batholith and Saldaña Formation in southern Colombia Putumayo region. Results suggest that the plutonic and volcanic activities are closely related to a common magmatic history. This volcano-plutonic association presents a well-defined LILE and LREE enrichment and negative Nb and Ti negative anomalies characteristic of continental magmatic arcs. Volcanic and plutonic rocks crystallized between 180-186 Ma as revealed by U-Pb zircon geochronology. The magmatic activity is temporally and chemically correlatable with other magmatic arc exposures in Colombia and Ecuador. These units may represent the remnants of a single belt which includes several units from 4°N in Colombia and 5°S in Ecuador. This arc is related to the widespread Jurassic continental magmatic arc setting that characterized the continental margins of the Americas after Pangea break-up.
New field data, geochemical analyses and zircon U-Pb LA-ICP MS data were obtained on plutonic and volcanic rocks of the Mocoa Batholith and Saldaña Formation in southern Colombia Putumayo region. Results suggest that the plutonic and volcanic activities are closely related to a common magmatic history. This volcano-plutonic association presents a well-defined LILE and LREE enrichment and negative Nb and Ti negative anomalies characteristic of continental magmatic arcs. Volcanic and plutonic rocks crystallized between 180-186 Ma as revealed by U-Pb zircon geochronology. The magmatic activity is temporally and chemically correlatable with other magmatic arc exposures in Colombia and Ecuador. These units may represent the remnants of a single belt which includes several units from 4°N in Colombia and 5°S in Ecuador. This arc is related to the widespread Jurassic continental magmatic arc setting that characterized the continental margins of the Americas after Pangea break-up.
Keywords
Jurassic, continental arc, geochronology, geochemistry, Jurásico, arco continental, geocronología, geoquímica