Resumo

VESGA G, Ana María  e  JARAMILLO M., José. GEOCHEMISTRY OF THE VOLCANIC DOME IN THE MUNICIPIO OF IZA, DEPARTAMENTO OF BOYACA; INTERPRETATION GEODINAMIC AND COMPARISON WITH THE NEÓGENO VULCANISM OF THE ORIENTAL CORDILLERA. bol.geol. [online]. 2009, vol.31, n.2, pp.97-108. ISSN 0120-0283.

This work has as purpose to offer new analytic data, supplemented the available ones until the present regarding the volcanic rocks of the region of Iza, (Boyacá); in the same way, the development of a new approach, as for determining if exists a direct connection with other volcanic deposits geographically near to the study area, using descriptive statistical methods. It was realized a characterization geochemistry for 12 samples gathered in the area, where were analyzed big elements, smaller and traces and using diagrams of characterization for effusive rocks, it is corroborated that these possess an alkaline likeness of composión riolític. Besides the use of normalized diagrams whose abundances of elements of strong electrostatic field (HFSE) as the Nb and Zr, and elements of big ionic radio (LILE) in this case the Rb, they allowed to this rocks characteristic of ambient coalitional. On the other hand, with the obtained results of the statistical analyses, the existent relationship settled down between two geographically places near, as are it volcanic bodies of Los Naranjos and those of Paipa. As for of Iza, it was found that relationship doesn’t exist some with another volcanic body among the studied sectors, probably due the alteration hydrothermal that presents the dome of Iza.

Palavras-chave : alkaline; alteration hydrothermal; ambient colisionales; geochemistry; riolític; volcanic body.

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