At the southernmost part of Tierra del Fuego a few outcrops and erratic boulders of alkali basaltic rocks with ultramafic enclaves have been studied. Alkali basalt plugs or pipes hitherto identified are scarce, and host rocks are constituted by slates that belong to Mesozoic deposition. The petrography, texture and composition of the basalt and xenoliths were investigated by petrographic micros...

Abstract The objective of this work was to identify microbial communities associated with the surfaces alkali feldspars and determine whether these microbes might be involved in weathering rocks for agronomic benefit. Samples were taken from profiles soils developed on a syenite, considered as raw material agromineral production, located municipality Triunfo, state Pernambuco, Brazil. Molecular...

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The pre-Neogene basement of the Slavonia-Srijem Depression (eastern Croatia) is composed various types igneous, metamorphic and sedimentary rocks. Here we present petrography geochemistry a heterogenous group represented by two alkali granite, syenite, rhyolite orthogneiss. granite type 1 has an A-type geochemical affinity: ferroan character, high content, concentration rare earth elements (REE...