Difference in N2/Ar ratio of magmatic gases from northeast and southwest Japan: New evidence for different states of plate subduction

Abstract

Research Article| May 01, 1993 Difference in N2/Ar ratio of magmatic gases from northeast and southwest Japan: New evidence for different states of plate subduction Itsuro Kita; Itsuro Kita 1Research Institute of Natural Resources, Mining College, Akita University, Akita 010, Japan Search for other works by this author on: GSW Google Scholar Kouzo Nitta; Kouzo Nitta 1Research Institute of Natural Resources, Mining College, Akita University, Akita 010, Japan Search for other works by this author on: GSW Google Scholar Keisuke Nagao; Keisuke Nagao 2Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-01, Japan Search for other works by this author on: GSW Google Scholar Sachihiro Taguchi; Sachihiro Taguchi 3Faculty of Science, Fukuoka University, Fukuoka 814-01, Japan Search for other works by this author on: GSW Google Scholar Akito Koga Akito Koga 4Geothermal Research Center, Kyushu University, Kasuga, Fukuoka 816, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Itsuro Kita 1Research Institute of Natural Resources, Mining College, Akita University, Akita 010, Japan Kouzo Nitta 1Research Institute of Natural Resources, Mining College, Akita University, Akita 010, Japan Keisuke Nagao 2Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-01, Japan Sachihiro Taguchi 3Faculty of Science, Fukuoka University, Fukuoka 814-01, Japan Akito Koga 4Geothermal Research Center, Kyushu University, Kasuga, Fukuoka 816, Japan Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (5): 391–394. https://doi.org/10.1130/0091-7613(1993)021<0391:DINARO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Itsuro Kita, Kouzo Nitta, Keisuke Nagao, Sachihiro Taguchi, Akito Koga; Difference in N2/Ar ratio of magmatic gases from northeast and southwest Japan: New evidence for different states of plate subduction. Geology 1993;; 21 (5): 391–394. doi: https://doi.org/10.1130/0091-7613(1993)021<0391:DINARO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Two different plates are subductiog beneath the Japanese island arcs, the Pacific plate in the north and the Philippine Sea plate in the south. Geophysical evidence indicates that the Philippine Sea plate subducts without extending beneath many of the volcanoes in the southwest Japan arc. The N2/Ar ratio (424) of a common magmatic gas from geothermal and volcanic areas in southwestern Japan is an order of magnitude lower than the value (4250) in northeastern Japan. Because the high N2/Ar values reflect input from subducted sediments, the large difference in the N2/Ar ratios of magmatic gases indicates that the contribution of subducted sediment to the source of magma in southwestern Japan is much lower than that in northeastern Japan. The N2/Ar ratios off magmatic gases from island arcs elsewhere may also yield information regarding the degree of contribution of subducted sediments to arc magma sources and differences in the states of plate subduction. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.