Banded Iron Formations are characteristic iron-rich rocks. The deposition of these rocks occured in specific time intervals in Earth history, such as during the first Great Oxygenation Event (GOE) at ca. 2.4-2.2 billion years ago and after the Neoproterozoic Snowball Earth glaciations (Rapitan-type iron formations). A number of factors seem to have been interconnected inContinuar lendo “Microbes influence the formation of iron deposits and can be used in energy fuel cells / Micróbios influenciam na formação de depósitos de ferro e podem ser usados em células de geração de energia”
Arquivos da categoria: Minerals
THE AGE OF MOUNTAINS AND CONTINENTS FROM TINY MINERALS /A IDADE DAS MONTANHAS E DOS CONTINENTES EM PEQUENOS MINERAIS
Some minerals found in rocks are special in that they accommodate a lot of specific chemical elements in their structures and almost none of other elements. This is the case of zircon (ZrSiO4), which likes Uranium but allow almost no Lead in it’s structure. This turns zircon in an ideal mineral to calculate the ageContinuar lendo “THE AGE OF MOUNTAINS AND CONTINENTS FROM TINY MINERALS /A IDADE DAS MONTANHAS E DOS CONTINENTES EM PEQUENOS MINERAIS”
APATITE FISSION TRACKS and mountain denudation / TRAÇOS DE FISSÃO EM APATITA e denudação das montanhas
Those small minerals can help to understand how quickly a mountain belt is eroded. The method is based on the decay of radiogenic elements within the mineral structure, which leaves small tracks due to the damage caused by the nuclear disintegration. By counting the density and length of the tracks, we can estimate the timeContinuar lendo “APATITE FISSION TRACKS and mountain denudation / TRAÇOS DE FISSÃO EM APATITA e denudação das montanhas”
Project MOBILE 