Data for: The closure of the Rocas Verdes Basin and early tectono-metamorphic evolution of the Magallanes Fold-and-Thrust Belt, southern Patagonian Andes (52-54°S)
Description
Dataset of processed major-element composition of phengite, chlorite, epidote, feldspar, and biotite analyzed in samples FC1723, FC1727, FC1749, and FC1757, from Chilean Southern Patagonia (latitudes 52-54°S), in a field work in 2017 under the supervision of Prof. Mauricio Calderón. The mineral chemical composition was determined using the EPMA CAMECA SX100 at Universität Stuttgart, with 5 wavelength-dispersive spectrometers and an energy-dispersive system. Operating conditions were an acceleration voltage of 15 kV, a beam current of 15 nA, a beam size of 1–3 μm or a focused beam (for very small crystals), and 20 seconds counting time on the Kα peak (Ba: Lα) and on the background for each element. The standards used were natural wollastonite (Si, Ca), natural orthoclase (K), natural albite (Na), natural rhodonite (Mn), synthetic Cr2O3 (Cr), synthetic TiO2 (Ti), natural hematite (Fe), natural baryte (Ba), synthetic MgO (Mg), synthetic Al2O3 (Al) and synthetic NiO (Ni). The PaP correction procedure provided by CAMECA was applied. Analytical errors of this method are given by Massonne (2012).