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Full-Text Articles in Physical Sciences and Mathematics
Recreating Intercalated Clays Of Chondritic Meteorites, Katherine Winchell
Recreating Intercalated Clays Of Chondritic Meteorites, Katherine Winchell
Scholars Week
In order to better understand the reactions that form intercalated clays in carbonaceous chondritic (CC) meteorites, a suite of six combinations of nontronite plus fine-grained metal, organics, or sulfur ± water were heated at a temperature of 200°C in sealed Parr bomb containers for a period of three months. Intercalation is the process of materials being introduced between the layers of expandable clays via cation exchange. Reflectance spectra of CC meteorites differ from those of mixtures of the end members made physically in that the CC spectra are darker and show extremely subdued absorption bands of the phyllosilicates (clays) that …
Analysis Of Concentric Growth Rings In Hydrothermal Epidote, Brandi Petryk
Analysis Of Concentric Growth Rings In Hydrothermal Epidote, Brandi Petryk
Scholars Week
Crystals found within geothermal cores from Akutan Island, Alaska, show concentric growth rings of what appear to be alternating bands of epidote and clinozoisite minerals. The intent of this project is to determine the nature of these growth rings and what processes could allow them to form. Our working hypothesis is that the rings are due to fluctuations in the oxidation states of the hydrothermal system, which would control the amount of available Fe3+ needed to make epidote. In relatively reducing conditions, Fe3+ would be scarce and clinozoisite (Fe-poor variety of epidote) would form. We have tested this hypothesis by …