Szczegóły publikacji
Opis bibliograficzny
Petrology and new data on the geochemistry of the Andahua volcanic group (Cental Andes, southern Peru) / Andrzej GAŁAŚ // Journal of South American Earth Sciences ; ISSN 0895-9811. — 2014 — vol. 56, s. 301–315. — Bibliogr. s. 314–315, Abstr.
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 86456 |
|---|---|
| Data dodania do BaDAP | 2014-12-16 |
| DOI | 10.1016/j.jsames.2014.09.012 |
| Rok publikacji | 2014 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of South American Earth Sciences |
Abstract
The Quaternary Andahua volcanic group is located within the Central Volcanic Zone in Southern Peru. The author presents new data on major and trace elements and Sr-87/Sr-86 and Nd-143/Nd-144 ratios for Andahua rocks from all regions with volcanic centres. The TAS data identify the Andahua lavas as trachyandesites, basaltic trachyandesites and dacites. The phenocrysts are represented mainly by plagioclase, but olivine, clinopyroxene and hornblende are also present. In some cases the trachyandesites show Ca enrichment and their plagioclases have an andesine-bytownite composition. The plagioclase phenocrysts show a slight normal and occasionally reverse zonation. Their basaltic parental magmas were enriched in fluids derived from dehydration of the subducted oceanic crust. The chemical content of the Andahua volcanic rocks shows some similarity to both the slightly older and the contemporaneous and widespread Barroso Group rocks in this region. (C) 2014 Elsevier Ltd. All rights reserved.