title: Erosion rate study at the Allchar deposit (Macedonia) based on radioactive and stable cosmogenic nuclides (26Al,36Cl,3He, and21Ne).
abstract: This paper focuses on constraining the erosion rate in the area of the Allchar Sb-As-Tl-Au deposit (Macedonia). It contains the largest known reserves of lorandite (TlAsS2), which is essential for the LORanditeEXperiment (LOREX), aimed at determining the long-term solar neutrino flux. Because the erosion history of the Allchar area is crucial for the success of LOREX, we applied terrestrial in situ cosmogenic nuclides including both radioactive (26Al and36Cl) and stable (3He and21Ne) nuclides in quartz, dolomite/calcite, sanidine, and diopside. The obtained results suggest that there is accordance in the values obtained by applying26Al,36Cl, and21Ne for around 85% of the entire sample collection, with resulting erosion rates varying from several tens of m/Ma to ∼165 m/Ma. The samples from four locations (L-8 CD, L1b/R, L1c/R, and L-4/ADR) give erosion rates between 300 and 400 m/Ma. Although these localities reveal remarkably higher values, which may be explained by burial events that occurred in part of Allchar, the erosion rate estimates mostly in the range between 50 and 100 m/Ma. This range further enables us to estimate the vertical erosion rate values for the two main ore bodies Crven Dol and Centralni Deo. We also estimate that the lower and upper limits of average paleo-depths for the ore body Centralni Deo from 4.3 Ma to the present are 250-290 and 750-790 m, respectively, whereas the upper limit of paleo-depth for the ore body Crven Dol over the same geological age is 860 m. The estimated paleo-depth values allow estimating the relative contributions of205Pb derived from pp-neutrino and fast cosmic-ray muons, respectively, which is an important prerequisite for the LOREX experiment.
authors: Chemistry and Physics of Materials University of Salzburg Salzburg Austria.
authors: M K
authors: MK
authors: Pavićević
authors: Faculty of Mining and Geology University of Belgrade Belgrade Serbia.
authors: V
authors: V
authors: Cvetković
authors: Helmholtz-Zentrum Potsdam-Deutsches GeoForschungsZentrum GFZ Potsdam Germany.
authors: S
authors: S
authors: Niedermann
authors: Faculty of Physics University of Belgrade Belgrade Serbia.
authors: V
authors: V
authors: Pejović
authors: Chemistry and Physics of Materials University of Salzburg Salzburg Austria.
authors: G
authors: G
authors: Amthauer
authors: Faculty of Mining and Geology University of Štip Štip Macedonia (FYROM).
authors: B
authors: B
authors: Boev
authors: Gesellschaft für Schwerionenforschung GSI Darmstadt Germany.
authors: F
authors: F
authors: Bosch
authors: Faculty of Physics University of Belgrade Belgrade Serbia.
authors: I
authors: I
authors: Aničin
authors: Argonne National Laboratory, Physics Division Argonne Illinois USA.
authors: W F
authors: WF
authors: Henning
keywords: 205Tl; Allchar; cosmogenic nuclides; erosion; paleo‐depth; pp‐neutrinos