NDLI: Niveles Piroclásticos Como Herramientas De Correlación En Los Depósitos Cenozoicos Del Grupo Payogastilla, Valles Calchaquí, Tonco Y Amblayo, En El Noroeste De Argentina

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Niveles Piroclásticos Como Herramientas De Correlación En Los Depósitos Cenozoicos Del Grupo Payogastilla, Valles Calchaquí, Tonco Y Amblayo, En El Noroeste De Argentina

Content Provider	Semantic Scholar
Author	Coira, Beatriz Galli, Claudia Inés Kay, Suzanne Mahlburg Kay, Robert W. Flores, Patrocinio
Copyright Year	2014
Abstract	The tuffs in the Cenozoic sedimentary sequences of the Payogastilla Group in the Calchaqui, Tonco and Amblayo valleys, Salta, Argentina, can be divided into three distinct textural, mineralogical and geochemical groups that correspond to: (from older to younger) the Angastaco, the Palo Pintado and the San Felipe Formations. Chemical analyses of these tuffs show that they are calc-alkaline magmas with medium-K compositions in the Angastaco and Palo Pintado Formations and with high-K compositions in the San Felipe Formation. Rhyodacite-dacite and traquiandesite composition characterize the Payogastilla Group tuffs. Rare andesitic tuffs also occur in the Angastaco Formation. The chemistry of these tuffs is like that of arc magmas with similar light REE (La/Sm=4,0-6,2) and distinct heavy REE patterns (Sm/Yb=1,6-2,4 in the Angastaco Fm. 3,9-4,1 in the Palo Pintado Formation and 4,0-5,6 in the San Felipe Formation). Using the chemistry, mineralogy and published ages of the tuffs, as a guide, possible eruptive centers are the 15-13 Ma Agua Escondida center (Angastaco Formation), the 10-7 Ma Calama-Olacapato-El Torro group centers (Palo Pintado Formation) and the 6-3 Ma Cerro Galan, Toconquis and Cueva Negra ignimbrite centers (San Felipe Formation).
Starting Page	147
Ending Page	160
Page Count	14
File Format	PDF HTM / HTML
Volume Number	71
Alternate Webpage(s)	http://www.scielo.org.ar/pdf/raga/v71n2/v71n2a01.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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