Chemical composition of sulfides from enstatite-rich meteorites

Description

Datasets of two accelerating voltages (10 and 20 kV) of EPMA analysis of sulfides of enstatite-rich meteorites, including enstatite chondrite and aubrite, are published. Sulfides analyzed in these datasets consist of Cr-Ti-bearing troilite, daubréelite (FeCr2S4), and (Mg,Fe,Mn)S-monosulfide consisting of niningerite (MgS), kelitite (Fe>0.5Mg<0.5S), and alabandite (MnS). A list of the meteorites included in the study is in an Excel file uploaded here.

Steps to reproduce

Samples: We analyzed the set of one-inch polished thick sections of enstatite-rich meteorites. The Excel file, named List of samples, contains detailed information about the sample suite. Electron probe microanalysis: All samples were carbon-coated before the analyses. The chemical composition of sulfides was acquired with a JEOL 8230 Superprobe equipped with a LaB6 electron source, five wavelength-dispersive spectrometers (WDS), and an energy-dispersive spectrometer (EDS) housed at the Institute of Geology of the Czech Academy of Sciences in Prague. Two sets of analyses were acquired with the following analytical conditions: The first set: an accelerating voltage of 20 kV, 4 nA probe current, and a focused beam. The second set: an accelerating voltage of 10 kV, 25 nA probe current, and 1 µm beam diameter. The Excel file, named Analyzed elements, used spectral lines, standards, spectrometer crystal, and average detection limits in ppm, contains detailed information about the analytical conditions for both set. The display of measured analytical points for each set of analyses is included for better understanding. Note that not only troilite, daubréelite, and (Mg,Fe,Mn)S monosulfide were analyzed; however, the other data are not included in this published dataset. Moreover, we are aware that the analytical points are not always displayed in the correct position. However, it is a bias in the analytical points marking of the instrument software and not a mistake in the analytical point measurement itself. The position of all analytical points was checked before measurement and afterward. Sulfides analyzed included troilite, daubréelite, and (Mg,Fe,Mn)S monosulfide. The calculation of the troilite and (Mg,Fe,Mn)S monosulfide formulas was based on 2 atoms per formula unit. The calculation of the daubréelite formula was based on 7 atoms per formula unit.

Institutions

Categories

Funding

Licence