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Application of PIXE to the characterization of vitreous dacites from archaeolgical sites in the Atacama region in northern Chile
(2007)
Geochemical characterization studies using PIXE were carried out on 21 vitreous dacite artifacts from early formative archaeological sites in the Atacama region, in northern Chile, and on 13 samples taken from two potential ...
The onset of flood basalt volcanism, Northern Parana Basin, Brazil: A precise U-Pb baddeleyite/zircon age for a Chapeco-type dacite
(ELSEVIER SCIENCE BV, 2011)
We report the first U-Pb baddeleyite/zircon date for a felsic volcanic rock from the Parana Large Igneous Province in south Brazil. The new date of 134.3 +/- 0.8 Ma for a hypocrystalline Chapeco-type dacite from Ourinhos ...
Structural Constraints on Paraná Basalt Volcanism and their Implications on Agate Geode Mineralization (Salto do Jacuí, RS, Brazil)Structural Constraints on Paraná Basalt Volcanism and their Implications on Agate Geode Mineralization (Salto do Jacuí, RS, Brazil)
(Instituto de Geociências /Universidade Federal do Rio Grande do Sul, 2006)
Removal of Pb2+ from aqueous solutions using two Brazilian rocks containing zeolites
(SPRINGERNEW YORK, 2012)
The removal of Pb2+ from aqueous solution by two Brazilian rocks that contain zeolites-amygdaloidal dacite (ZD) and sandstone (ZS)-was examined by batch experiments. ZD contains mordenite and ZS, stilbite. The effects of ...
Cordierite-bearing lavas from Jaguarao, southern Brazil: Petrological evidence for crustal melts during early rifting of Gondwana
(ELSEVIER SCIENCE BV, 2010)
The Jaguarao stratoid dacites (Rio Grande do Sul, Brazil) are limited in areal extent, are comprised of about 3.2 km(3) of preserved erupted material, and outcrop only in areas of the region underlain by mylonitic and ...
Evolution of the Taupo Volcanic Center, New Zealand: petrological and thermal constraints from the Omega dacite
(Springer, 2013)
The 20 ka *0.1 km3 Omega dacite, which
erupted shortly after the 26.5 ka Oruanui super-eruption,
compositionally stands out among Taupo Volcanic Zone
(TVZ) magmas, which are overwhelmingly characterized
by rhyolites ...
Geochemical analysis of vitreous rocks exploited during the formative period in the Atacama Region, Northern Chile
(2009)
Petrographic analysis and geochemical characterization studies were carried out on vitreous dacite and/or rhyodacite artefacts from Formative period archaeological sites in the upper Salado River Basin in the Atacama Desert, ...