Los granitoides ordovícicos de la Sierra de Chepes, Batolito de Los Llanos ? Ulapes, Sierras Pampeanas.

DAHLQUIST, J.A.; RAPELA, C.W.

Vila Real

Congreso; XIV Reuniao de Geologia do Oeste Peninsular. Evoluçao geológica do Macizo Ibérico e seu enquadramento continental. Reuniao anual do PICG ? 376 Laurentia ? Gondwana - Báltica Connections.; 1997

Universidad de Oviedo y Universidad de Tras-os-Montes e Alto Douro.

The Los Llanos-Ulapes batholith of Sierras Pampeanas is a complex assemblage of plutons of Ordovician age emplaced in low-to-high grade metasedimentary rocks. Metaluminous and peraluminous granites were recognised in a petrological-geochemical study of the Sierra de Chepes. Metaluminous granites define a calc-alkaline trend controlled by crystal-liquid fractionation. A contrasted cordierite-bearing monzogranite unit shows a different trend with strong geochemical affinities with the metasedimentary rocks. Nd and Sr isotopes of both metaluminous and peraluminous units indicate a large crutsal component in the source which is a distinctive feature of these Ordovician continental arc rocks.