Date: 30 April, 2021

Dataset Title: Ferric iron triggers greenalite formation in simulated Archean seawater 

Dataset Creators: I. Hinz, C. Nims, S. Theuer, A. Templeton, & J. Johnson

Dataset Contact: Jena Johnson jenaje@umich.edu

Funding: 80NSSC18K1060 (NASA)


Key Points:
- Synthesizing iron-silicates under environmentally relavent conditions for the Archean ocean 
- The addition of 5% Fe(III) of 1 mM Fetotal produced abundant silicates 
- Aging at 150C for 5 days vastly increased silicate crystallinity compared to 25C for 5 days


Research Overview:
Labratory experiments were conducted to compare iron precipitation under completely ferruginous conditions with solutions that contain a low amount of oxidized iron, which can be seen as a proxy for iron oxidation in the environment.


Methodology:
See Supplemental Material: Ferric iron triggers greenalite formation in simulated Archean seawater in Geology 2021. 
https://doi.org/10.1130/G48495.1


Instrument and/or Software specifications: 
See Supplemental Material: Ferric iron triggers greenalite formation in simulated Archean seawater in Geology 2021. 
https://doi.org/10.1130/G48495.1


Files contained here:

XRD Spectra: 2theta vs Intensity

- CITCronstedtite_Cu_XRD.txt 			Iron-silicate standard. 			Suffix: _Cu = Cu source XRD
- Kapton_merged_Co_XRD.xy			Background diffraction of kapton tube.		Suffix: _Co = Co source XRD 


- ISS_5FE3_PH6_5_150C_merged_Co_XRD.xy		Sample 5% Fe(III), pH 6.5, 150C 5 days aged	Suffix: _Co = Co source XRD
- ISS_5FE3_PH6_5_RT_5DAYS_merged_Co_XRD.xy	Sample 5% Fe(III), pH 6.5, 25C 5 days aged	Suffix: _Co = Co source XRD
- ISS_5FE3_PH7_RT_5DAYS_merged_Co_XRD.xy	Sample 5% Fe(III), pH 7.0, 25C 5 days aged	Suffix: _Co = Co source XRD
- ISS_5FE3_PH7_150C_merged_Co_XRD.xy		Sample 5% Fe(III), pH 7.0, 150C 5 days aged	Suffix: _Co = Co source XRD
- ISS_5FE3_PH7_5_RT_5DAYS_merged_Co_XRD.xy	Sample 5% Fe(III), pH 7.5, 25C 5 days aged	Suffix: _Co = Co source XRD
- ISS_5FE3_PH7_5_150C_merged_Co_XRD.xy		Sample 5% Fe(III), pH 7.5, 150C 5 days aged	Suffix: _Co = Co source XRD		



Use and Access: 
This data set is made available under a Creative Commons Public Domain license (CC0 4.0).


To Cite Data: 
Hinz, I.L., Nims, C., Theuer, S., Templeton, A., & Johnson, J.E, (2021). Ferric iron triggers greenalite formation in simulated Archean seawater [Data Set]. University of Michigan - Deep Blue. Deep Blue. https://doi.org/10.7302/k2hs-nh21