SciELO - Scientific Electronic Library Online

 
vol.44 número2Evolución tectonoestratigráfica y arquitectura cenozoica de los Andes Centrales en el norte de Chile, región de Aquine, Cordillera Occidental (19°-19°30’ S)Geoquímica de rocas ígneas Permo-Triásicas del norte de Chile (28°-30°15’S): Implicancias en la dinámica del margen pre-Andino índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google

Compartilhar


Andean geology

versão On-line ISSN 0718-7106

Resumo

CISTERNA, Clara Eugenia et al. Arenigian tholeiitic basalts in the Famatina Ordovician basin, northwestern Argentina: emplacement conditions and their tectonic significance. AndGeo [online]. 2017, vol.44, n.2, pp.123-146. ISSN 0718-7106.  http://dx.doi.org/10.5027/andgeoV44n2-a02.

This study is focused on the analysis of volcanic deposits that crop out at the middle portion of the Las Planchadas range, northern part of the Famatina System in Argentina. These volcanic rocks are records of an Ordovician effusive basaltic volcanism that took place under subaqueous marine conditions. Along the study area crop out an Arenigian volcanic and volcaniclastic rocks succession with massive and autoclastic lavas, hyaloclastites of basaltic composition and volcaniclastic sandstones and mudstones. Large volumes of the volcanic deposits were strongly affected by fragmentation processes during their subaqueous emplacement and in situ accumulated as basaltic breccias. The same volcanic-volcaniclastic association crops out to the south of the Las Planchadas range, forming a basaltic belt with similar characteristics. The geochemical features of the basalts are compatible with depleted mid-ocean ridge basalt (MORB)-like source for the magma, with contribution of subducted related components such as water rich marine hemipelagic sediments, compatible with a back arc geotectonic setting developed along the northern part of the Famatina System during the Arenigian.

Palavras-chave : Tholeiitic basalts; Syn-eruptive Hyaloclastic deposits; Ordovician; Famatina belt.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons