An example of multicomponent magnetization in welded tuffs: a case study of Upper Cretaceous welded tuffs of eastern Russia |
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| Institution: | 1. Universidad Nacional de la Patagonia San Juan Bosco, Dpto. de Geología, Comodoro Rivadavia, Argentina;2. Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), UBA, Argentina;3. CONICET, Argentina;4. Universidad de Concepción, Dpto. de Ciencias de la Tierra, Concepción, Chile;5. Servicio Geológico y Minero Argentino (SEGEMAR), Argentina;6. CAPSA-Capex, Argentina;1. School of Resources Environment and Safety Engineering, University of South China, Hengyang, China;2. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China;1. School of Human Science and Environment, University of Hyogo, 670–0092, Hyogo, Japan;2. Center for Southeast Asian Studies, Kyoto University, Kyoto 606–8501, Japan;3. School of Environmental Science, The University of Shiga Prefecture, 522–8533, Shiga, Japan;4. Center for Spatial Information Science, The University of Tokyo, Kashiwa, Chiba 277-8568, Japan;5. Graduate School of Agriculture, Kyoto University, 606–8502 Kyoto, Japan;6. Forestry and Environment Division, Forest Research Institute, Malaysia;7. Department of Global Liberal Studies, Faculty of Global Liberal Studies, Nanzan University, Aichi 466–8673, Japan;1. Department of Earth System Science, Fukuoka University, Fukuoka 814-0180, Japan;2. Département des Sciences de la Terre, Université de Genève, Rue des Maraîchers 13, Genève 1205, Switzerland;3. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;4. Graduate School of Education, Okayama University, Okayama 700-8530, Japan;5. Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10300, Thailand;6. Department of Geology and Minerals, Vientiane, Lao People''s Democratic Republic |
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| Abstract: | Four distinct components of natural remanent magnetization were isolated from a single site in welded tuffs in the Upper Cretaceous Kisin Group of the Sikhote Alin mountain range, Russia. In order to contribute toward a basis for an interpretation of multicomponent magnetization, rock magnetic experiments were performed on the welded tuffs. All four magnetization components essentially reside in magnetite. The lowest-temperature component up to 300 °C (component A: D=349.3°, I=60.9°, α95=7.3°, N=7) is a present day viscous magnetization. The third-removed component (component C: D=41.4°, I=51.8°, α95=3.5°, N=8), isolated over the temperature range of 450–560 °C, is a primary remanence. The second- and fourth-demagnetized components (component B: D=174.7°, I=?53.1°, α95=21.2°, N=3 and component D: D=188.1°, I=?64.5°, α95=4.0°, N=8, respectively) are secondary magnetizations related to a thermal event in Sikhote Alin between 66 and 51 Ma. Components B and D were acquired through different remagnetization processes. Component B is ascribed to a thermoviscous remanent magnetization carried by single-domain magnetite, and component D is a chemical remanent magnetization. |
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