Počet záznamů: 1
Pumpellyite and coexisting minerals in metapelites and veins from the Federico Units in the Internal Zone of the Rif, Spain
0340581 - GLU-S 2011 RIV CA eng J - Článek v odborném periodiku
Ruiz Cruz, M. D. - Sanz de Galdeano, C. - Alvarez-Valero, A. - Novák, Jiří Karel
Pumpellyite and coexisting minerals in metapelites and veins from the Federico Units in the Internal Zone of the Rif, Spain.
Canadian Mineralogist. Roč. 48, č. 1 (2010), s. 183-203 ISSN 0008-4476
Výzkumný záměr: CEZ:AV0Z30130516
Klíčová slova: Betic-Rif Cordillera * Alpine metamorphism * Federico units * metamorphism (Marocco/Spain)
Kód oboru RIV: DB - Geologie a mineralogie
Impakt faktor: 1.289, rok: 2010
The discovery of unusual pumpellyite-bearing assemblages in Permo-Triassic phyllites and synfolian veins from the Beni Mezala I unit is important, because it allows the comparison of the P-T conditions deduced from present parageneses. Pumpellyite is considered sensitive indicator of the metamorphic grade. The Federico units (from northern Rif belt) described here are well exposed near Ceuta (Spain enclave), where they are tectonically overlain by the Ghomáride terrane. The chemical data clearly indicate the presence of two populations of pumpellyite: a/ Fe-rich pumpellyite from actinolite-bearing assemblage, in equilibrium with Fe-rich epidote, and b/ pumpellyite richer in Al from actinolite-free veinlets in phyllite. The composition of the first population is typical of the low-grade pumpellyite described in the zeolite and prehnite-pumpellyite facies. This assemblage in pumpellyite-bearing rocks usually indicate pressures of ca 2 kbar and temperatures of ca 250 °C.
Trvalý link: http://hdl.handle.net/11104/0183793