A regional-scale geochemical survey of soil O and C horizon samples in Nord-Trøndelag,Central Norway: Geology and mineral potential |
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| Institution: | 1. School of Earth, Environmental & Biological Sciences, Queensland University of Technology, Brisbane, QLD 4001, Australia;2. CSIRO Land & Water, Dutton Park, Brisbane, QLD 4102, Australia;3. Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;4. HydroSciences Montpellier, UMR 5569, Université de Montpellier, 34000 Montpellier, France;1. Watershed Studies Institute and Department of Geosciences, Murray State University, Murray, KY 42071, United States;2. Department of Anthropology, State University of New York at Potsdam, Potsdam, NY 13676, United States;3. Department of Anthropology, Temple University, Philadelphia, PA 19122, United States;4. New Jersey Historic Preservation Office, Trenton, NJ 08609, United States;5. Terrestrial Paleoclimatology Research Group, Department of Geology, One Bear Place #97354, Baylor University, Waco, TX 76798-7354, United States;1. The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA, 6845, Australia;2. Department of Geological Sciences, University of Cape Town, Rondebosch, 7701, South Africa;3. Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, 6009, WA, Australia;4. CSIRO Mineral Resources, Australian Resources Research Centre, 26 Dick Perry Avenue, Kensington, WA, 6151, Australia |
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| Abstract: | A highly efficient, low-density sampling strategy was employed to study the geochemical expression of geological bodies and the mineral potential on the county scale in Central Norway. Soil O and C horizon samples (N = 752) were collected in Nord-Trøndelag and parts of Sør-Trøndelag, and analysed for 53 chemical elements (Ag, Al, As, Au, B, Ba, Be, Bi, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, Hf, Hg, In, K, La, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Pd, Pt, Rb, Re, S, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Ti, Tl, U, V, W, Y, Zn, and Zr) and Pb isotopes in an aqua regia extraction. At the sample density of one site/36 km2 the four metal deposits, which have been mined in the area within the last 50 years were all detected as geochemical anomalies. In addition, a number of new anomalies that may warrant follow-up surveys were found. In terms of geology the Grong–Olden Culmination is marked by a distinct 206Pb/207Pb isotope anomaly. Geochemical differences distinguish the most important belts of mafic metavolcanic lithologies in the area. Though the Fosdalen iron ore deposit is only marked in the soil O horizon, the C horizon outlines the more prominent anomalies of possibly economic interest. Climatic factors like the input of marine aerosols along the coast are clearly visible in the soil O horizon. Low-density geochemical mapping of two sample materials provides important complementing information for the interpretation of the geochemical variation in Nord-Trøndelag county. |
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