Heterogeneidade mantélica de bacias vulcano-sedimentares em contexto global: uma abordagem comparativa

Abstract

One of the most recent developments of volcanology is the analysis of mantle heterogeneity and its contribution to magmatism, mainly of basic rocks. However, this type of study doesn’t yet surpass the regional scale, with a myriad of local studies pointing to a possible heterogeneity in the source of a given occurrence, in which the principle is frequently the topic of discussion. As a way of analyzing this possible agents in a global perspective, this study analyzes basic volcanic rocks from 13 different sedimentary basins worldwide in order to identify heterogeneous signatures in its source, with 9 of them being continental basins and the remaining 5 being oceanic environments, representing pre, post and rifting geotectonic contexts. It is concluded that mantle heterogeneity is an influential factor in all basic magmatism associated with sedimentary basins, which is proportional to crustal thickness.