Role of back-arc tectonics in the origin of subduction magmas: new Sr,Nd, and Pb isotope data from Middle Miocene lavas of Kunashir Island (Kurile Island Arc) |
| |
| Institution: | 1. Far East Geological Institute, Far Eastern Branch of the Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022, Russia;2. Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, ul. Nauki 5, Yuzhno-Sakhalinsk, 693022, Russia;3. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology Yokosuka, 237 0061, Japan;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Geological Institute, Kola Research Center of the Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk Region, 184209, Russia;3. Karpinsky All-Russian Research Geological Institute, Srednii prosp. 74, St. Petersburg, 199106, Russia;4. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia;2. Geological Survey of Western Australia, East Perth, WA 6004, Australia;3. ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, Australia;4. School of Earth and Environment, University of Western Australia, Australia;5. Centre for Exploration Targeting, School of Earth and Environment, University of Western Australia, Australia;1. Institute of the Earth’s Crust, Siberina Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia;2. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, Zh-17, 119017, Russia |
| |
| Abstract: | Sr, Nd, and Pb isotope data for basaltic rocks of different ages from Kunashir Island (southern Kurile island arc) provide clues to investigate the subduction magmatic history. Signatures of a high-temperature slab component (melt and/or supercritical liquid produced by melting of slab sediments) involved in Early Miocene–Pleistocene back-arc basaltic magmatism indicate a relatively hot (> 800 °C) slab surface. Depleted isotope characteristics of Holocene basaltic lavas in both volcanic front and back arc indicate their origin with the participation of a cold aqueous fluid produced by dehydration of altered oceanic crust of the Pacific MORB type. The difference in geological, geochemical and isotope patterns in the Pleistocene and the Holocene lavas may be a response to stress change from extension to compression in the Kurile back-arc basin and the Kurile arc. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
