Cuttings of Lower and Middle Keuper sediments of the INFLUINS-drilling in the central Thuringian Syncline were geochemically analysed. Indications about shifting depositional environments are interpreted from ratios of whole-rock element contents. For the middle part of sandstone cycle S 2 high heavy metal contents imply precipitation of sufidic ores during a short marine interval. Element contents are compared with potential source rocks in the southern part of the Baltic Shield, in the Lausitz Anticline Zone, in the Erzgebirge, in the moldanubian part, in the broad sense, of the Bohemian Massif, in the Münchberg Gneiss Massif and the Fichtelgebirge. The geochemical coincidence of investigated Keuper sediments is highest with grantioid and gabbroic rocks of southern Scandinavia. Granodiorite rocks of the Lausitz are also possible sources, whereas granites of the Fichtelgebirge and the Bohemian Massif are less probable.
Data use restricted to users until end of INFLUINS moratorium, December 31, 2017.1. Low-field mass-specific magnetic susceptibility: Magnetic susceptibility meter MS2, by Bartington, with bulk sensor b, mean of 8x measurements in low frequency (460 Hz) following DEARING, J. (1994): Environmental magnetic susceptibility - using the Bartington MS2 system. - 1. Ed.; 1-104 pp.; Kenilworth, UK (Chi Publishing). Diamagnetic effect of sample boxes accounted for as -410 -9 m3 kg-1. Standard deviation on average 5 10 -9 m3 kg-1 for mean values of 400 *10 -9 m3 kg-1.2. Total digestion: 100 ±0.1 mg of powdered sample in Polytetrafluoroethylene-boxes, plus 2 ml HNO3 65 %, plus 3 ml HF 40 %, plus 3 ml HClO4 70-72 %, 12 hrs reaction time at 20°C, then heating to 180°C during 4 hrs, 12 hrs reaction time at this temperature, then cooling, then evaporation at 180°C for 12 hrs, solid phase digested during 10 hrs at 150°C with 2 ml HNO3, 65%, subboiled, 0,6 ml HCl, 30 %, 7 ml purified water, solution in PMP vials completed to 25 ml by addition of purified water.3. Geochemical analyses: Inductively-coupled plasma with optical emission spectrometry, ICP-OES, 725 ES, by Varian, for main elements plus Sr, Zr; ICP with mass-spectrometry, ICP-MS, XSeries II, by Thermo Fisher Scientific, for trace elements. Calibration for ICP-OES with Multielementstandard, Merck, for ICP-MS with multielementsolution of single/multielementsolutions of ICP Standard CertiPUR, 39-CMS-1, 39-CMS-5, 39-IV-Stock 57 by Inorganic Ventures; precision for concentrations distinctly above detection limits typically better than ±3 % for ICP-MS and better than ±2 % for ICP-OES, accuracy better than ±5 %.
Supplement to: Pirrung, Michael; Händel, Mathias; Merten, Dirk; Engelhart, Jörn; Pudlo, Dieter; Totsche, Kai-Uwe; Voigt, Thomas (2015): Zur Geochemie der Sedimente des Unteren und Mittleren Keupers der zentralen Thüringer Mulde. Beiträge zur Geologie von Thüringen, Neue Folge, 22
