Abstract

SALAZAR-TORRES, Juan Carlos et al. PETROLOGY AND GEOCHEMISTRY OF THE VOLCANIC ROCKS OF CERRO LA TETA AND JURAREIN CREEK, HIGH GUAJIRA - COLOMBIA. bol.geol. [online]. 2013, vol.35, n.2, pp.53-63. ISSN 0120-0283.

This work aims to provide new analytical data, complementing the existing information about the Jurassic volcanic rocks of Cerro La Teta and Jurarein creek in the high area of la Guajira. A Geochemical characterization for three field samples collected in the area was made; major, minor and trace elements were analyzed, indicating a sub alkaline affinity from calc-alkaline series using characterization diagrams for volcanic rocks. The chondritic normalized diagrams show abundance of light rare earth elements (LREE) (La/Yb) _N of 6,38 - 37,17 and of (La/Ce)_N of 1,31 - 1,35 instead of heavy rare earth elements (HREE) (Gd/Yb) _N of 1,15 - 1,35. Geotectonic diagrams suggest that these rocks were formed in a collisional environment, with a calc-alkaline affinity. Analyzing these data we can suggest that during the generation of the volcanic rhyodacite of the Cerro La Teta, the Colombian Guajira Peninsula was in a more southwestern position than the proposed by Kennan and Pindell (2009), closer to Farallon Plate subduction zone.

Keywords : Rhyolite; Cerro La Teta; Petrography; Geochemistry; Calc-alkaline; Guajira.

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