Geology, geochemistry and petrology of basalts from Paraná Continental Magmatic Province in the Araguari, Uberlândia, Uberaba and Sacramento regions, Minas Gerais state, Brazil

Abstract

This study covers the region between the cities of Sacramento and Araguari/Uberlândia (Minas Gerais State, Brazil), where basalt flows from the Paraná Continental Magmatic Province outcrop. The investigated rocks present tholeiitic signature, with high titanium content, and are classified as Pitanga magma-type. The preserved basalt thickness is between 10 and 200 meters and individual flows do not exceed 15 meters thick. Flows were identified as sheet lobes, smaller and thinner flows units-stacked laterally and vertically forming compound lavas-, or frontal, centimetric lobes. The basalt flows show decimetric to metric intercalations of clastic sedimentary rock, with depositional characteristics that can vary from aeolian to lacustrine, and are important markers on prevailing environmental conditions. The plagioclases are dominantly labradorite and pyroxene is augite, whereas olivine can be hyalosiderite or hortonolite/ferrohortonolite. The behavior of the major, minor and trace elements is compatible with the presence of at least two parental magmas, which were subjected to fractional crystallization mainly of plagioclase, clinopyroxene, ilmenite and magnetite. There is a chemistry distinction between basalts from Sacramento to those from Araguari/Uberlândia region, the former one showing more evolved than the last one. The high (La/Lu)N values are indicative of partial melting of a garnet peridotite, while the Rare Earth Elements (REE) values are indicative of fractional crystallization.

Characterization of Mineralogy, Petrography, Geochemistry and Petrogensis of Basaltic Outcrops in Jurf Ed Darawish Area, Central Jordan

“…The pyroxene crystals have an inclined extinction between 41˚ to 47˚, indicating the presence of clinopyroxene of diopside to augite mineral. The classification of pyroxene after [14] diagram, the rock samples of JDB is plotted within diopside and augite field (Figure 2(b)), these result documented within [15]. The clinopyroxene intersected with plagioclase crystals to form sub ophitic texture.…”

Successive off take of elements by maize grown in pure basalt powder

“…Offtake of manganese, boron, copper, and zinc showed a similar trend when normalized (Figures 4 and 5), although were taken up in different proportions by plants. Krahl et al 237 The micronutrients Mn, B and Zn are present indistinctively in all primary minerals that compose this basalt, especially diopside (Moraes et al, 2018), while Cu is accumulated in smectite structure, formed by hydrothermal process (Baggio et al, 2016).…”

“…A basalt sample was collected from piles located at Araguari, Minas Gerais State, Brazil (Moraes et al, 2018). This is a by-product that originated from the production of gravel for civil construction.…”