Impact‐related thermal effects on the redox state of Ca‐pyroxene

McCanta, M. C.; Dyar, M. D.

doi:10.1111/maps.12793

Cited by 8 publications

(4 citation statements)

References 73 publications

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“…The three doublets located in the central section of the spectrum partially originate from the dominant diopside/diopsidealuminum phase. Similar Mössbauer parameters for the Fe 3+ -A-doublet were found for the diopside (De Grave and Eeckhout Sigrid 2003;McCanta and Dyar 2017) where the ferric ions usually prefer the M1 site in the pyroxenes. Since it is not commonly found for diopsides (Dyar et al 2006;J.…”

Section: Characterization Of the Tns-pz Samplesupporting

confidence: 65%

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

Novack

Reis

Hackbarth

et al. 2020

Environ Sci Pollut Res

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Section: Characterization Of the Tns-pz Samplesupporting

confidence: 65%

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

Novack

Reis

Hackbarth

et al. 2020

Environ Sci Pollut Res

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“…Changes in the spectral slope of chlorite between λ = 1 and 2 μm suggest that Fe‐oxidation is related to shock, as has been observed in igneous minerals [ McCanta and Dyar , ]. Mössbauer spectroscopy results relating the amount of oxidized Fe to total Fe show that even relatively low amounts of shock pressure (10–20 GPa) have a profound effect on Fe oxidation for chlorite (Figure ).…”

Section: Effects Of Shock On Near‐infrared Spectroscopy Of Clay Mineralsmentioning

confidence: 65%

Shock metamorphism of clay minerals on Mars by meteor impact

Michalski

Glotch

Friedlander

et al. 2017

Geophysical Research Letters

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A large fraction of clay minerals detected on Mars by infrared remote sensing represent materials exhumed from the subsurface by meteor impact, begging the question of whether the infrared features used to detect the clays are affected by shock associated with the impacts. We used X‐ray diffraction and infrared and Mössbauer spectroscopy to evaluate the mineralogy of five clay minerals after experimentally shocking them to six shock pressures from ~10 to 40 GPa. The shocked clays exhibit three main relevant shock effects: (1) an overall decrease in infrared spectral contrast in the impact‐fragmented materials, (2) oxidation of Fe in ferrous clays, and (3) loss of some spectral structure in relatively well‐ordered clays such as kaolinite. Other than the widespread oxidation of ferrous clays, shock metamorphism likely has little effect on the accurate interpretation of clay mineralogy on Mars from remote sensing data. However, we are able to identify rare cases of extreme shock in some Martian clay deposits.

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“…The oxidation state of Fe during and after an impact event is a controversial topic: recently, McCanta and Dyar (2017) studied a set of un‐shocked and shocked Ca‐pyroxenes by means of VNIR reflectance spectroscopy and MS and concluded that shock impacts increase the amount of oxidized Fe. On the other hand, Lukanin and Kadik (2007), Costa et al.…”

Section: Discussionmentioning

confidence: 99%

Spectroscopic Characterization of Impactites and a Machine Learning Approach to Determine the Oxidation State of Iron in Glass‐Bearing Materials

et al. 2023

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We investigated a suite of impact glass‐bearing rocks using a multi‐analytical approach including visible‐near‐infrared diffuse reflectance spectroscopy, Mössbauer spectroscopy, and powder X‐ray diffraction. In order to better understand and interpret the obtained results, we built a database containing physical, chemical, and spectroscopic information on glasses and glass‐bearing materials using new results from this study and published works. We used the database to explore systematic relationships between parameters of interest and finally we applied several machine learning algorithms (support vector machine, random forests, and gradient boosting) to test the possibility to regress the oxidation state of iron from chemical and spectroscopic information. Our results show that even small amounts of mafic crystalline phases have a big influence on the spectral features of glass‐bearing rocks. Samples without mafic crystalline inclusions show the typical spectrum of glasses (two broad and shallow bands roughly centered around 1,100 and 1,900 nm) with minor variations due to bulk chemistry. We described a non‐linear relationship between average reflectance (average reflectance value between 500 and 1,000 nm), FeO + TiO2 content, grain size, and Fe3+/FeTOT. We tested the relation for the finer grain size (0–25 μm), and we qualitatively assessed how it is affected by grain size, Fe3+/FeTOT, and crystal content. Finally, we developed a machine learning pipeline to regress the Fe3+/FeTOT of glass‐bearing materials using the proposed database. Our machine learning calculations give satisfactory results (MAE: 0.0321) and additional data will enable the application of our computational strategy to remotely acquired data to extract chemical and mineralogical information of planetary surfaces.

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Impact‐related thermal effects on the redox state of Ca‐pyroxene

Cited by 8 publications

References 73 publications

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

Shock metamorphism of clay minerals on Mars by meteor impact

Spectroscopic Characterization of Impactites and a Machine Learning Approach to Determine the Oxidation State of Iron in Glass‐Bearing Materials

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