Work Description

��Read Me: The files contained in this repository consist of 1.) Raw XRD files -Naming convention: Sample-Number_SizeFraction_preparationMethod.txt e.g. for MTF-FW2_M_AO.TXT Sample #: MTF-FW2 Size Fraction: M (Medium) Preparation Method: AO (Air-dried, oriented via suspension method. See Moore and Reynolds 1997) size fractions key: C (Coarse) MC (Medium Coarse) M (Medium) F (Fine) -XRD parameters are included in the header of each txt file 2) Stable Isotopic Measurements -Sample naming conventions are the same as above, less the preparation method. -Lab Hydrogen standards are listed with samples: G1-Biotite and Kaol_#17B -Lab Oxygen standard is also included: LS-1 Measurement Methods: Hydrogen Stable isotopic measurements of hydrogen and oxygen were completed at the Institute of Earth Surface Dynamics (IDYST) at the University of Lausanne (UNIL). Approximately 1.5 2mg of duplicate sample separates were encapsulated in silver foil packets and kept under vacuum for at least 12 hours prior to analysis. Samples were then quickly transferred to a helium-flushed zero-blank autosampler connected to a Thermo Finnigan Delta Plus XL thermochemical elemental analyzer (TC/EA). A helium carrier gas transferred the reduced hydrogen gas to the mass spectrometer, which measured the ratios of H2 and DH gases, and the weight percent water for each sample. Results are reported using �-notation relative to standard mean ocean water (SMOW) and are reproducible to �3 0 across duplicate sample aliquots. Oxygen Prior to oxygen analyses, samples were loaded onto a platinum sample plate and heated in an oven at 150�C for at least 12 hours. Oxygen gas was isolated from silicate samples for isotopic measurements with laser fluorination (e.g., Sharp, 1990), using a vacuum of approximately 10-4 Pa prior to fluorination. Extracted oxygen gas was collected on a zeolite molecular sieve and transferred to a Finnigan MAT 253 Mass Spectrometer for measurement. As with hydrogen, results are reported using �-notation relative to standard mean ocean water (SMOW) and are reproducible to �0.2 0. We were unable to measure one sample (16: KKF-91-1A) for oxygen isotopic composition due to its reaction with F2 gas at room temperature. Moore, D.M., & Reynolds Jr., R.C. (1997), X-Ray Diffraction and the Identification and Analysis of Clay Minerals, New York, NY: Oxford University Press. Sharp, Z.D. (1990), A laser-based microanalytical method for the in situ determination of oxygen isotope ratios of silicates and oxides. Geochimica et Cosmochimica Acta, 54(5), 1353 1357, doi: 10.1016/0016-7037(90)90160-M.