@article{DaempflingMielkeKoellneretal.2022,
  author    = {D{\"a}mpfling, Helge L. C. and Mielke, Christian and Koellner, Nicole and Lorenz, Melanie and Rogass, Christian and Altenberger, Uwe and Harlov, Daniel E. and Knoper, Michael},
  title     = {Automatic element and mineral detection in thin sections using hyperspectral transmittance imaging microscopy (HyperTIM)},
  series = {European journal of mineralogy},
  volume    = {34},
  journal   = {European journal of mineralogy},
  number    = {3},
  publisher = {Copernicus},
  address   = {G{\"o}ttingen},
  issn      = {0935-1221},
  doi       = {10.5194/ejm-34-275-2022},
  pages     = {275 -- 284},
  year      = {2022},
  abstract  = {In this study we present a novel method for the automatic detection of minerals and elements using hyperspectral transmittance imaging microscopy measurements of complete thin sections (HyperTIM). This is accomplished by using a hyperspectral camera system that operates in the visible and near-infrared (VNIR) range with a specifically designed sample holder, scanning setup, and a microscope lens. We utilize this method on a monazite ore thin section from Steenkampskraal (South Africa), which we analyzed for the rare earth element (REE)-bearing mineral monazite ((Ce,Nd,La)PO4), with high concentrations of Nd. The transmittance analyses with the hyperspectral VNIR camera can be used to identify REE minerals and Nd in thin sections. We propose a three-point band depth index, the Nd feature depth index (NdFD), and its related product the Nd band depth index (NdBDI), which enables automatic mineral detection and classification for the Nd-bearing monazites in thin sections. In combination with the average concentration of the relative Nd content, it permits a destruction-free, total concentration calculation for Nd across the entire thin section.},
  language  = {en}
}
@article{RibackiTrumbullLopezDeLuchietal.2022,
  author    = {Ribacki, Enrico and Trumbull, Robert B. and Lopez De Luchi, Monica Graciela and Altenberger, Uwe},
  title     = {The chemical and B-Isotope composition of Tourmaline from intra-granitic Pegmatites in the Las Chacras-Potrerillos Batholith, Argentina},
  series = {The Canadian mineralogist : journal of the Mineralogical Association of Canada},
  volume    = {60},
  journal   = {The Canadian mineralogist : journal of the Mineralogical Association of Canada},
  number    = {1},
  publisher = {Association of Canada},
  address   = {Ottawa},
  issn      = {0008-4476},
  doi       = {10.3749/canmin.2100036},
  pages     = {49 -- 66},
  year      = {2022},
  abstract  = {The Devonian Las Chacras-Potrerillos batholith comprises six nested monzonitic to granitic intrusions with metaluminous to weakly peraluminous composition and a Sr-Nd isotopic signature indicating a dominantly juvenile mantle-derived source. The chemically most evolved units in the southern batholith contain a large number of intra-granitic, pod-shaped tourmaline-bearing pegmatites. This study uses in situ chemical and boron isotopic analyses of tourmaline from nine of these pegmatites to discuss their relationship to the respective host intrusions and the implications of their B-isotope composition for the source and evolution of the magmas. The tourmalines reveal a diversity in element composition (e.g., FeO, MgO, TiO2, CaO, MnO, F) which distinguishes individual pegmatites from one another. However, all have a narrow 5 11 B range of -13.7 to -10.5\%0 (n = 100) which indicates a relatively uniform magmatic system and similar temperature conditions during tourmaline crystallization. The average delta(11) B value of -11.7\%0 is typical for S-type granites and is within the range reported for peraluminous granites. pegmatites, and metamorphic units of the Ordovician basement into which the Las Chacras-Potrerillos batholith intruded. The B-isotope evidence argues for a crustal boron source like that of the Ordovician basement, in contrast to the metaluminous to weakly peraluminous composition and juvenile initial Sr and Nd isotope ratios of the Las Chacras-Potrerillos batholith magmas. We propose that the boron was not derived from the magma source region but was incorporated from dehydration melting of elastic metasedimentary rocks higher up in the crustal column.},
  language  = {en}
}