This dataset accompanies the manuscript entitled "Temporal and Granulometric Variability of Fluvial Sand Composition: An Annual Time Series from Four Rivers in SW Germany" by Laura Stutenbecker et al., submitted to JGR Earth Surface in March 2023. The study aims at analyzing the temporal variability of fluvial sediment composition. For this purpose, sediment of four rivers was sampled monthly over the course of one year between April 2019 and December 2020 at the same locations, using the same operator, tools, and sampling strategy, resulting in a total of 46 grab samples. The sampled rivers were the Gersprenz, Modau, Mümling and Upper Neckar rivers in southwestern Germany.
The summary of sample names, coordinates, and sampling dates can be found in the data table "Sampling dates". The sediment was wet-sieved for grain-size analysis using six sieve sizes (63, 125, 250, 500, 1000, and 2000 micrometers). The percentage of each fraction after drying and weighing is provided in the table "Granulometry". The individual fractions (172 sub-samples in total) were analyzed for chemical composition. Geochemical analysis was performed using wavelength-dispersive X-ray spectrometry on pressed powder pellets using a S8 Tiger 4 kW (Bruker) spectrometer at Technical University of Darmstadt. Geochemical data of major element oxides and selected trace elements (in wt% and ppm, respectively) is provided in data table "XRF". Mineralogical analysis was performed on selected samples using X-ray diffraction on powdered samples using a Panalytical X'Pert Pro diffractometer at Goethe University Frankfurt am Main. The percentages of the minerals quartz, alkali feldspar, plagioclase, calcite, dolomite, illite/muscovite, kaolinite, chlorite, amphibole, goethite, and hematite are provided in data table "XRD". The data was input into an unmixing model following Lizaga et al. (2020, https://doi.org/10.1007/s11269-020-02650-0). The data table "Mixing modeling results" sums up the model performance (goodness of fit) as well as the modeled sediment source contributions (in percent, mean and standard deviation) of three considered sediment sources from the literature.
This data-set contains provenance detrital data from the glacimarine sequence of Deep Sea Drilling Project Site 270. The 270 site was cored on a flank of the Central High in the central Ross Sea and recovered a thick Oligocene to lower Miocene glacimarine sequence, overlain by ~20 m of Pliocene to Recent strata. This site provides important temporal constraints on regional stratigraphy and insights into late Oligocene to early Miocene ice sheet dynamics. We analyzed eight detrital samples of glaciomarine sediments distributed along the core and two from the basement rocks recovered during coring, by using an integrated single-grain provenance approach. This multi-proxy provenance study employs conventional U-Pb detrital zircon dating integrated with apatite U-Pb and fission-track dating and trace element analysis of detrital apatite and clast petrology. The data-set suggests a general evolution from local erosion due to small ice caps to far-travelled glacial detritus responding to the continuous sea floor subsidence. The detrital age spectra of a late Oligocene diamicitite is consistent with far travelled grains from southern West Antarctica (WA), suggesting an expansion of the WA ice sheet that should be the oldest and first evidence of ice sheet growth on the WA.
This dataset contains provenance detrital data from the glacimarine sequence of Deep Sea Drilling Project Leg 28, Site 271 e 272. The two boreholes are located in the middle of the Ross Sea, in a key site close at 180° longitude that is considered the present confluence between ice flows fed by West Antarctica and East Antarctica. These two sites, together, provide insights to Middle Miocene to Present ice sheet dynamics.
We analyzed eight detrital samples of glaciomarine sediments, four from 272 drill core and 4 from 271. We used an integrated single-grain provenance approach (Olivetti et al., 2023). This multi-proxy provenance study employs conventional U-Pb detrital zircon dating integrated with apatite U-Pb and fission-track dating and trace element analysis of detrital apatite.
The dataset suggests a recurrent E - W oscillations of the ice flow divide between ice fed by West and East Antarctica ice sheets, respectively.