![]() ![]() ![]() A model involving melting processes of basic material, trapped at the base of the crust, with composition similar to low and high TiO 2 basalts appears to be a possibility to originate the Palmas and Chapeco acid melts, respectively. The results obtained sugest an assimilation-fractional crystallization process as viable to explain the differences of both the chemical characteristics and Sr isotope initial ratios observed in basic and intermediate rocks. Several petrogenetic models were tested to explain the compocional variability of the volcanic rocks, in particular those of southern region. In order to study the influence of crustal contamination processes in changing chemical characteristics of the volcanic rocks, 47 samples representative of the crystalline basement of the southern and southeastern Parana Basin were also analysed. The remaining sixty five samples are distributed over the entire basin. Ninety three of these volcanic samples belong to 8 flow sequences from Rio Grande do Sul and Santa Catarina States. The results are based on the analyses of major and trace elements of 158 samples. ![]() International Nuclear Information System (INIS)Ī detailed study of the geochemical characteristics of Parana Basin volcanic rocks is presented. Geochemical characterization of Parana Basin volcanic rocks: petrogenetic implications ![]()
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