Dataset Information

The parisite-(Ce) enigma: challenges in the identification of fluorcarbonate minerals.

ABSTRACT: A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B ₃ S ₄ (i.e., bastnäsite-3-synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite-(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data - impeded by twinning, complex stacking patterns, sequential and compositional faults - indicates that the dominant parisite-(Ce) polytype M ₁ has space group Cc. Parisite-(Ce), the B ₃ S ₄ phase and röntgenite-(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite-(Ce), the B ₃ S ₄ phase and röntgenite-(Ce) reveal different intensity ratios of the three symmetric CO₃ stretching bands at around 1100 cm^-1. We propose to non-destructively differentiate parisite-(Ce) and röntgenite-(Ce) by their 1092 cm^-1 / 1081 cm^-1 ?₁(CO₃) band height ratio.

SUBMITTER: Zeug M

PROVIDER: S-EPMC7831744 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature

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The parisite-(Ce) enigma: challenges in the identification of fluorcarbonate minerals.

Zeug Manuela M Nasdala Lutz L Ende Martin M Habler Gerlinde G Hauzenberger Christoph C Chanmuang N Chutimun C Škoda Radek R Topa Dan D Wildner Manfred M Wirth Richard R

Mineralogy and petrology 20201010 1

A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite-(Ce) with röntgenite-(Ce) and a phase which is assigned to B 3 S 4 (i.e., bast ...[more]

PMID: 33519095

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Project description:A previously unidentified artifact has been found in Compact Reconnaissance Imaging Spectrometer for Mars targeted I/F data. It exists in a small fraction (<0.05%) of pixels within 90% of images investigated and occurs in regions of high spectral/spatial variance. This artifact mimics real mineral absorptions in width and depth and occurs most often at 1.9 and 2.1 μm, thus interfering in the search for some mineral phases, including alunite, kieserite, serpentine, and perchlorate. A filtering step in the data processing pipeline, between radiance and I/F versions of the data, convolves narrow artifacts ("spikes") with real atmospheric absorptions in these wavelength regions to create spurious absorption-like features. The majority of previous orbital detections of alunite, kieserite, and serpentine we investigated can be confirmed using radiance and raw data, but few to none of the perchlorate detections reported in published literature remain robust over the 1.0- to 2.65-μm wavelength range.Plain language summaryMany minerals can be identified with remote sensing data by their characteristic absorptions in visible-shortwave infrared data. This type of data has allowed geological interpretation of much of Mars' surface, using satellite-based observation. We have discovered an issue with the Compact Reconnaissance Imaging Spectrometer for Mars instrument's data processing pipeline. In ~ <0.05% of pixels in almost all images, noise in the data is smoothed in such a way that it mimics real mineral absorptions, falsely making it look as though certain minerals are present on Mars' surface. The vast majority of previously identified minerals are still confirmed after accounting for the artifact, but some to all perchlorate detections and a few serpentine detections were not confirmed, suggesting that the artifact created false detections. This means concentrated regions of perchlorate may not occur on Mars and so may not be available to generate possibly habitable salty liquid water at very cold temperatures.

Dataset Information

The parisite-(Ce) enigma: challenges in the identification of fluorcarbonate minerals.

Publications

The parisite-(Ce) enigma: challenges in the identification of fluorcarbonate minerals.

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