Opalinus Clay is chosen as host rock for the deep geological disposal of nuclear waste in Switzerland and is also being considered in Germany. The underlying Staffelegg Formation comprises potentially water-bearing layers. To investigate the hydrogeological setting of these two formations at the Swiss Rock Laboratory in Mont Terri two bore holes have been drilled in the framework of the HS-Experiment (Hydrogeological Survey). The 58 m long BHS-1 starts in the Lower Shaly facies of the Opalinus Clay, crossects the entire Staffelegg formation and ends in the Triassic Klettgau formation. The shorter BHS-2 provides additional data from the carbonate-rich sandy facies and Lower Shaly facies of the Opalinus Clay. The presented data publication provides geochemical, mineralogical and petrophysical parameters of rocks, pore water and (dissolved) gases from these two drillings. In the following the main measured parameter are listed: geochemical composition of bulk rock and single minerals, isotopic data of carbonates and S isotopes of bulk rock, cation exchange, analyses of organic compounds, bulk rock and clay mineralogy, bulk density, porosity, water content, noble gases, pore water composition, composition and isotopes of dissolved gases and water isotopes.
This data publication consists of two parts:
(1) the questionnaire for round 1 of the G-Chron proficiency test as provided to the participating laboratories via the on-line data submission portal, and
(2) the complete data set of submitted results.
The results of the survey are published as Scientific Technical Report - Data (STR 21/06, Webb et al., 2020).
The questionnaire is structured into distinct segments. The first “metadata segment” allowed each laboratory to report key parameters describing their analytical technique. This part was structured as five independent tracks based on laboratory technique: isotope dilution thermal ionization mass spectrometry (ID-TIMS), secondary ion mass spectrometry (SIMS), laser ablation inductively coupled sector field mass spectrometry (LA-ICP-MS: SF), laser ablation inductively coupled quadrupole / time-of-flight mass spectrometry (LA-ICP-MS: Quad&ToF), and “other”. When reporting results a given laboratory was to select a single one of these options and then was provided a series of questions relevant to that specific method. The second segment of the questionnaire was provided to all laboratories for them to submit their determined age results. The on-line portal required submission of the determined age and uncertainty for both the 206Pb/238U and 207Pb/206Pb chronometers. Submission of results for the 208Pb/232Th chronometer was optional.
Both the April 2020 report and the subsequent manuscript for publication are based on the table that forms the second part of this document. This contains both the reported age values and information about key aspects of each laboratory’s analytical method. In a small number of cases the input data were corrupted due to an apparent incompatibility between the data portal and the character set used by the submitting laboratory. Where the intent of the laboratory reporting was obvious these have been corrected. For two of the reporting laboratories there a software malfunction resulted in their submissions being classified as “other technique”. These data have now been reassigned to their correct technique categories, but the report has not been accordingly modified. All age values are in Ma. The software specified that uncertainty values should be reported as 1s or 1SE, depending on the nature of the value being addressed, though in a number of instances this instruction appears not to have been applied.
This data collection bundles six datasets about the surface, subsurface and environmental conditions of saltpans that express polygonal patterns in their surface salt crust that are fully described in Lasser et al., 2020 (https://doi.org/10.5194/essd-2020-86). Information stems from 5 field sites at Badwater Basin and 21 field sites at Owens Lake – both in central California, US. All data was recorded during two field campaigns, from between November and December, 2016, and in January 2018.
(1) Lasser, J., Goehring, L. (2020a). Grain size distributions of sand samples from Owens Lake and Badwater Basin in central California, collected in 2016 and 2018. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.910996
(2) Lasser, J., Goehring, L. (2020b): Subsurface salt concentration profiles and pore water density measurements from Owens Lake, central California, measured in 2018 (Version 2). PANGAEA, https://doi.org/10.1594/PANGAEA.922264
(3) Lasser, J., Goehring, L., Nield, J. M. (2020). Images and Videos from Owens Lake and Badwater Basin in central California, taken in 2016 and 2018 [Data set]. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.911054
(4) Lasser, J., Karius, V. (2020). Chemical characterization of salt samples from Owens Lake and Badwater Basin, central California, collected in 2016 and 2018. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.911239
(5) Nield, J. M., Lasser, J., Goehring, L. (2020). TLS surface scans from Owens Lake and Badwater Basin, central California, measured in 2016 and 2018 [Data set]. PANGAEA - Data Publisher for Earth & Environmental Science. https://doi.org/10.1594/PANGAEA.911233
(6) Nield, J. M., Lasser, J., Goehring, L. (2020): Temperature and humidity time-series from Owens Lake, central California, measured during one week in November 2016 (Version 2). Max Planck Institute for Dynamics and Self-Organization, PANGAEA, https://doi.org/10.1594/PANGAEA.922231
The data presented here contains PHREEQC geochemical modeling input and output files to model mineralogical-geochemical reactions due to the CO2 injection at the Ketzin CO2 storage site, Germany. The used modeling tool is PHREEQC version 3.4 (Parkhurst & Appelo, 2013), and the Pitzer database (PITZER.dat) is applied. The geochemical model is conducted to investigate the potential mineral precipitation in the reservoir.
The available characterization of the Stuttgart Formation (Norden & Frykman, 2013) and pristine formation fluid (Würdemann et al., 2010) is used in the models. Ketzin baseline (referred as to B, data collected by Würdemann et al. (2010) and post-CO2 injection (referred as to PI, previously unpublished observation data) brine solutions were sampled and analyzed under the surface (B-S and PI-S) and reservoir conditions (B-R and PI-R). Ketzin reservoir pressure and temperature data were obtained at the observation well Ktzi 202 at a depth of 650m before and after the CO2 injection (previously unpublished observation data).