Browsing Fakultet for naturvitenskap og teknologi by Author "Sahlström, Fredrik"
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Combined X-Ray Computed Tomography and X-Ray Fluorescence Drill Core Scanning for 3-D Rock and Ore Characterization: Implications for the Lovisa Stratiform Zn-Pb Deposit and Its Structural Setting, Bergslagen, Sweden
Luth, Stefan; Sahlström, Fredrik; Bergqvist, Mikael; Hansson, Alexander; Lynch, Edward P.; Sädbom, Stefan; Jonsson, Erik; Andersson, Stefan S.; Arvanitidis, Nikolaos (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-29)We present the results of a pilot study that integrates automated drill core scanning technology based on simultaneous X-ray computed tomography (XCT) and X-ray fluorescence (XRF) analyses to provide high-spatialresolution (<0.2 mm) information on 3-D rock textures and structures, chemical composition, and density. Testing of its applicability for mineral exploration and research was performed by ... -
Iron isotopes constrain sub-seafloor hydrothermal processes at the Trans-Atlantic Geotraverse (TAG) active sulfide mound
Sahlström, Fredrik; Troll, Valentin R; Strmic Palinkas, Sabina; Kooijman, Ellen; Zheng, Xinyuan (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-29)Sub-seafloor hydrothermal processes along volcanically active plate boundaries are integral to the formation of seafloor massive sulfide deposits and to oceanic iron cycling, yet the nature of their relationship is poorly understood. Here we apply iron isotope analysis to sulfide minerals from the Trans-Atlantic Geotraverse (TAG) mound and underlying stockwork, 26°N Mid-Atlantic Ridge, to trace ... -
Mineral paragenesis and sulphide trace element distribution in the metamorphosed Lovisa Zn-Pb deposit, Bergslagen (Sweden), as revealed by 3D X-ray tomography, ore petrography and LA-ICP-MS analysis
Andersson, Stefan S.; Sahlström, Fredrik; Jonsson, Erik; Luth, Stefan; Lynch, Edward P.; Högdahl, Karin; Zack, Thomas; Gies, Nils; Sädbom, Stefan; Alexander Hansson, K.S.; Bergqvist, Mikael (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-29)This study encompasses the ore mineralogy, textures and sulphide trace element chemistry of the Palaeoproterozoic Lovisa stratiform Zn-Pb deposit and the stratigraphically underlying Lovisa Fe Formation in the Bergslagen ore province (Sweden). We investigate the relative timing of formation and subsequent modifications of its ores in relation to the c. 1.87–1.80 Ga Svecokarelian orogeny. The Lovisa ... -
Mineralogical distribution and genetic aspects of cobalt at the active Fåvne and Loki’s Castle seafloor massive sulfide deposits, Arctic Mid-Ocean Ridges
Sahlström, Fredrik; Strmic Palinkas, Sabina; Dundas, Siv Hjorth; Sendula, Eszter; Cheng, Yanbo; Wold, Marie; Pedersen, Rolf Birger Svarstad (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-16)The demand for responsibly sourced cobalt has increased dramatically as a result of the global transition to ‘fossil-free’ electromobility. However, the distribution, mineralogical expressions and mechanisms of concentration of Co in different types of hydrothermal ore deposits remain poorly constrained, inhibiting resource assessments and exploration. Here we report Co and other metal concentrations ...