Allchar (North Macedonia) mining area is known for anomalous background Tl concentrations. In this study, we combine accurate detection of Tl stable isotope ratios with data on mineralogy/speciation and chemical extraction of Tl in Tl-contaminated Technosol profiles. We demonstrate that Tl in the studied soils varies significantly in both concentration (500 mg/kg-18 g/kg) and isotopic composition (-1.6 and +3.2 of ε²⁰⁵Tl, a ∼0.5‰ spread), which is due to changes in the phase chemistry and/or mineralogy of Tl. Moreover, the observed ²⁰⁵Tl/²⁰³Tl ratios do not reflect the extent to which individual soils undergo Tl isotopic fractionation during mineral weathering and soil formation. Clearly, they reflect the initial isotopic signal(s) of the primary ore or ore minerals, and thus, the general history or type of their genesis. As the Tl carriers, various types of Tl-Me-arsenates, mixtures of jarosite and dorallcharite and minor Mn-oxides predominated. We revealed intense adsorption of Tl by the identified Mn-oxides (≤6.7 at.%). It is hypothesized that these phases are of key importance in the fractionation of Tl isotopes, meaning at this type of secondary oxide-soil solution interface. However, model studies involving primary/secondary components (sulfides, sulfates, oxides and arsenates) are required to understand the mechanisms that may lead to post-depositional Tl isotopic redistribution in soils, as well as Tl isotope systematics in mining wastes in general.

The Pelagonian metamorphic complex, or tectono-stratigraphic complex, extends approximately 420 km in length and 60 km in width in a NNW-SSE orientation, forming part of the central Hellenides. The occurrence of pegmatites within the Pelagonian metamorphic complex is quite common. They appear within the metamorphic complex of the gneisses and in direct contact with the granitic intrusive bodies. Mainly these pegmatite bodies are made of quartz, feldspars, micas (bioite, muscovite, paragonite, vermuiculite) as well as are the occurrence of rare minerals such as tourmalines, epidotes, apatites, garnets and zircons. The paper presents the new information related to the age of two pegmatitic bodies by the U/Pb dating and the K/Ar dating: Alinci and Čanište. The obtained age is Cretaceous.