INGEIS   05370
INSTITUTO DE GEOCRONOLOGIA Y GEOLOGIA ISOTOPICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
MIDDLE DEVONIAN MONZONITIC TO GRANITIC MAGMATISM OF THE SIERRA DE SAN LUIS: A RECORD OF CRUSTAL GROWTH IN EASTERN SIERRAS PAMPEANAS
Autor/es:
LÓPEZ DE LUCHI, M.; GEUNA, S. E.; NOLTE, N.; SIEGESMUND, S.; WEMMER, K.; RAPALINI, A.E.
Lugar:
Medellín
Reunión:
Simposio; 8th South American Symposium on Isotope Geology Medellin; 2012
Institución organizadora:
CORPOGEMMAS y otras
Resumen:
Middle Devonian Achalian granitoids intruded the Eastern Sierras Pampeanas (ESP) basement ca. 600 km east of the inferred proto-Pacific margin of Gondwana margin along which a coeval crustal thickening event was recognized. In Sierra de San Luis voluminous Middle Devonian (393-385 Ma) batholiths are made up by an I- to A-type hybrid monzonite–granite suite. The monzonite suite is composed of shoshonitic metaluminous magnesian alkali-calcic to alkalic porphyritic to equigranular monzodiorite, monzonite, quartz monzonite and monzogranite. The granite suite is composed of shoshonitic and high-K series granitoids which are mildly peraluminous equigranular magnesian alkali-calcic monzogranite and equigranular leucomonzogranites.The Sr–Nd isotopic composition of the monzonites and shoshonitic granites suggest the involvement of continental crustal components in a lithospheric mantle sources.
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