This MSAMurchisonDataSetreadme.txt file was generated on 20250618 by James Farquhar ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset: MSA Murchison Dataset 2. Author Information: Principal Investigator Contact Information: Name: James Farquhar Institution: University of Maryland, Department of Geology Address: 8000 Regents drive, College Park, MD 20742 Email: jfarquha@umd.edu Associate or Co-investigator Contact Information: Name: Amaury Bouyon Institution: University of Maryland, Department of Geology Address: 8000 Regents drive, College Park, MD 20742 Email: abouyon@umd.edu, amaury.bouyon@gmail.com 3. Date of data collection: 20240601 – 20241101 4. Geographic location of data collection: University of Maryland, USA 5. Information about funding sources that supported the collection of the data: NASA EW 80NSSC19K0516 P00006 -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: Use with DRUM DOI 2. Links to publications that cite or use the data: 3. Links to other publicly accessible locations of the data: 4. Links/relationships to ancillary data sets: 5. Was data derived from another source? No If yes, list source(s): 6. Recommended citation for the data: --------------------- DATA & FILE OVERVIEW --------------------- 1. File List: A. Filename: MSA_Murchison_Farquhar_Lab.xlsx Short description: This files contains normalized Sulfur isotope data for Murchison samples. First Tab contains processed sulfur isotope data for Murchison meteorite extracts normalized to Canyon Diablo Troilite. Second Tab contains Raw data (uncleaned) this tab also includes analyses of reference materials run on same days as Murchison analyses and analyses of sulfonic acids for tests). Last Tab contains the processing (Normalization) calculation for Murchison data. 2. Relationship between files: not applicable 3. Additional related data collected that was not included in the current data package: not applicable 4. Are there multiple versions of the dataset? No -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: The data were obtained using a ThermoFisher MAT 253 dual inlet mass spectrometer and are the output data from the mass spectrometry software. The software calculates isotopic data and reports them in the delta notation from ion beam intensity ratios using standard sample standard bracketing. The extracts were prepared using protocols described in Labidi et al 2017 (https://doi.org/10.1016/j.gca.2016.09.036). 2. Methods for processing the data: The raw data are processed in the file by first renormalizing the data to sample gas from the international standard reference material IAEA S-1 and then converting this normalization to the Canyon Diablo Troilite Reference scale of Dottin et al 2023 (https://doi.org/10.1029/2022JE007597) using values reported in that paper. 3. Instrument- or software-specific information needed to interpret the data: MS Excel, or other software able to read .xlsx format 4. Standards and calibration information, if appropriate: See 2. 5. Environmental/experimental conditions: 6. Describe any quality-assurance procedures performed on the data: The mass spectrometry uncertainties are reported for each value. All values standardized against international standard reference material IAEA S-1 Canyon Diablo Troilite (CDT). 7. People involved with sample collection, processing, analysis and/or submission: James Farquhar Amaury Bouyon ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: MSA_Murchison_Data_Farquhar_Lab.xlsx, Sheet "Normalized Data to CDT" ----------------------------------------- 1. Number of variables: 5 2. Number of cases/rows: 14 3. Variable List A. Name: d33S (col C) Description: Sulfur stable isotope 33 (per mil vs CDT). Standard delta notation used (defined as in https://doi.org/10.1029/2022JE007597). d33S = ( 33S / 32S ) sample /( 33S / 32S ) reference - 1, where 33 is the minor isotope. B. Name: d34S (col D) Description: Sulfur stable isotope 34 (per mil vs CDT). Standard delta notation used (defined as in https://doi.org/10.1029/2022JE007597). d34S = ( 34S / 32S ) sample / ( 34S / 32S ) reference - 1, where 34 is the minor isotope. C. Name: d36S (col E) Description: Sulfur stable isotope 36 (per mil vs CDT). Standard delta notation used (defined as in https://doi.org/10.1029/2022JE007597). d36S = ( 36S / 32S ) sample / ( 36S / 32S ) reference - 1, where 36 is the minor isotope. D. Name: D33S (col F) Description: Mass independent Sulfur stable isotope 33 (per mil vs CDT). Capital delta notation used (defined in https://doi.org/10.1029/2022JE007597). D33S = [( 33S / 32S ) sample / ( 33S / 32S ) reference] - [( 34S / 32S ) sample /( 34S / 32S ) reference] exp(lambda), where 33 and 34 are the minor isotopes, and lambda is the exponent that defines the mass dependent reference array 0.515 for 33S. E. Name: D36S (col G) Description: Mass independent Sulfur stable isotope 36 (per mil vs CDT). Capital delta notation used (defined in https://doi.org/10.1029/2022JE007597). D36S = [( 36S / 32S ) sample / ( 36S / 32S ) reference] - [( 34 S/ 32 S) sample /( 34 S/ 32 S) reference]exp(lambda), where 36 and 34 are the minor isotopes, and lambda is the exponent that defines the mass dependent reference array 1.9 for 36S. 4. Missing data codes: Code/symbol Definition Code/symbol Definition 5. Specialized formats of other abbreviations used ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: MSA_Murchison_Data_Farquhar_Lab.xlsx, Sheet "Raw Data" ----------------------------------------- # This sheet is provided to explain calculations for variables d33S, d34S, d36S, D33S, and D36S col A: Run Col B: Sample ID Col C: Analyst initials Col D: date col E: time (EST) Col F: Run conditions Information Col G: Method Col H: Reference signal intensity (mV) Col I: Sample signal Intensity (mV) Col J: instrument generated d33S Col K: instrument generated d34S Col L: instrument generated d36S Col M: d36S corrected for mass interference in the reference gas Col N: D33S of the sample relative to the reference Col O: D36S of the sample relative to the reference without mass interference removed from reference analyses Col P: D36 of the sample relative to reference with mass interference removed from reference ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: MSA_Murchison_Data_Farquhar_Lab.xlsx, Sheet "Normalization Calculations" ----------------------------------------- # This sheet is provided to explain normalization calculations for variables d33S, d34S, d36S, D33S, and D36S col A: Run Col B: Sample ID Col C: Analyst initials Col D: date col E: time (EST) Col F: Run conditions Information Col G: Method Col H: Reference signal intensity (mV) Col I: Sample signal Intensity (mV) Col J: instrument generated d33S Col K: instrument generated d34S Col L: instrument generated d36S Col M: d36S corrected for mass interference in the reference gas Col N: D33S of the sample relative to the reference Col O: D36S of the sample relative to the reference without mass interference removed from reference analyses Col P: D36 of the sample relative to reference with mass interference removed from reference Col R: average d33S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day.   Col S: average d34S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day Col T: average d36S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day Col U: average d36S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day, corrected for mass interference in the reference gas Col V: average D33S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day Col W: average D36S of Murchison runs relative to that of the average of IAEA-S-1 runs done each day Col Y: Run Col Z: Sample ID Col AA: average d33S of Murchison runs relative to Canyon Diablo Troilite with the calibration described in Dottin et al 2023 Col AB: average d34S of Murchison runs relative to Canyon Diablo Troilite with the calibration described in Dottin et al 2023 Col AC: average d36S of Murchison runs relative to Canyon Diablo Troilite with the calibration described in Dottin et al 2023 Col AE: average D33S of Murchison runs relative to Canyon Diablo Troilite with the calibration described in Dottin et al 2023 Col AF: average D36S of Murchison runs relative to Canyon Diablo Troilite with the calibration described in Dottin et al 2023