Geochemical fingerprint of the primary magma composition in the marine tephras originated from the Baegdusan and Ulleung volcanoes |
| |
| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;1. Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, South Korea;2. Department of Geology and Earth Environmental Sciences, Chungnam National University, Daejeon 34134, South Korea;3. Laboratoire Magmas et Volcans, Université Clermont Auvergne, CNRS, IRD, 6 Avenue Blaise Pascal, 63178 Aubière, France;4. Department of Earth and Environmental Sciences, Chungbuk National University, Cheongju 28644, South Korea;5. Geological Environmental Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, South Korea;1. DiBEST Università della Calabria, Italy;2. Research Laboratory for Archaeology and the History of Art, University of Oxford, UK;3. Dipartimento di Scienze della Terra e Geoambientali, Università di Bari, Italy;4. Department of Earth Sciences, Royal Holloway, University of London, UK |
| |
| Abstract: | The intraplate Baegdusan (Changbai) and Ulleung volcanoes located on the border of China, North Korea, and East/Japan Sea, respectively, have been explained by appeals to both hotspots and asthenospheric mantle upwelling (wet plume) caused by the stagnant Pacific plate. To understand the origin of the Baegdusan and Ulleung volcanism, we performed geochemical analyses on the tephra deposits in the East/Japan Sea basins originating from the Baegdusan and Ulleung volcanoes. The volcanic glass in the tephra from the Baegdusan and Ulleung volcanoes ranged from alkaline trachyte to peralkaline rhyolite and from phonolite to trachyte, respectively. The tephra from the two intraplate volcanoes showed highly enriched incompatible elements, such as Tb, Nb, Hf, and Ta, distinct from those of the ordinary arc volcanoes of the Japanese islands. The straddle distribution of the Th/Yb and Ta/Yb ratios of the tephra deposits from the Baegdusan volcano may originate from the alkali basaltic magma resulting from mixing between the wet plume from the stagnant Pacific plate in the transition zone and the overlying shallow asthenospheric mantle. In contrast, the deposits from the Ulleung volcano show a minor contribution of the stagnant slab to the basaltic magma, implying either partial melting of a more enriched mantle, smaller degrees of partial melting of a garnet-bearing mantle source, or a combination of both processes as the magma genesis. Our study indicated that the Baegdusan and Ulleung volcanoes have different magma sources and evolutionary histories. |
| |
| Keywords: | Baegdusan (Changbai) volcano Ulleung volcano Tephra Intraplate volcano Arc volcano |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
