RT Journal Article
T1 Aspectos composidonales de los piroxenos ígneos del magmatismo básico del sinclinal de Almadén. Implicaciones petrogenéticas
T1 Compositional constraints of igneous pyroxenes from the basic magmatism in the Almadén syncline.Petrogenetic implications
A1 Higueras, Pablo L.
A1 Morata Céspedes, Diego
AB Chemical composition of igneous pyroxenes in the basic rocks from the Almadén syncline shows important differences between basaltic lavas and olivine diabases (Silurian to Devonian in age), and quartzdiabases on the other hand. Higher CaO, Al203 and Ti02 and lower Si02 contents in pyroxenes from the first group are characteristics of alkaline magmas. Lower CaO, Al203 and Ti02 and higher Si02 in pyroxene from quartzdiabases are indicative of a subalkaline (tholeiitic) affinity. These chemical differences are consistent with whole-rock chemistry, with higher Nb/Y and (La/Lu)cn ratios in the first group. Alkaline and tholeiitic magmatism are a consequence of different partial melting rates, lower for the alkaline liquids
PB Sociedad Geológica de España
YR 1994
FD 1994
LK http://hdl.handle.net/10272/13926
UL http://hdl.handle.net/10272/13926
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 2 jun 2026