Internal structure of lava flows, Rishiri Volcano

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Authors:Yoshida, T.; Yamaguchi, T.; Kawasaki, Y.
Volume Title:Ganseki Kobutsu Kosho Gakkai-Shi Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Source:Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 76(6), p.181-194. Publisher: Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, Sendai, Japan. ISSN: 0021-4825
Publication Date:1981
Note:In Japanese with English summary. 20 refs.; illus. incl. 3 tables, geol. sketch map
Summary:Three types of vesicular segregated bodies are recognized in the Kutsugata lava flows, Rishiri Volcano, Hokkaido: 'segregation layer', 'segregation cylinder' and 'segregation stock'. In transverse section the segregation layer is a flat-lying parallel banding from several mm to more than 10 cm thick. The segregation cylinder is a slender vertical column, connected with the segregation layer at the upper end of the column. The segregation stock is defined as a pulse or plume segregated from the host lava, and is associated with the segregation layer. These segregated bodies must have formed during consolidation of the lava flows which had ceased to move on the flat ground, in the sequence: segregation layers, segregation cylinders and finally segregation stocks. It is considered that there were three mechanisms of material transport in the Kutsugata lava flows: flow of a viscous liquid in the extension fractures; volatile channelling in the three-phase fluidized system; and diapiric uprise of low density plastic masses. Eight chemical analyses of the segregated bodies were compared with six from their host rocks in a typical thick lava flow, in order to trace the fractionation trends of the magma after extrusion. [M.Ak.]
Subjects:Andesites; Basalts; Dacites; Flow structures; Igneous rocks; Lava; Lava flows; Major elements; Modal analysis; Petrology; Pyroclastics; Sedimentary structures; Soft sediment deformation; Trace elements; Volcanic rocks; Asia; Far East; Hokkaido; Japan; Rishiri Island; Rishiri Volcano
Abstract Numbers:85M/0991
Record ID:1982059947
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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001 1982059947
003 ViAlAGI
005 20190221163821.0
008 190110s1981 ja a 0 0 jpn d
040 |a ViAlAGI  |c ViAlAGI 
041 |a jpn  |b eng 
072 7 |a 05A  |2 georeft 
100 1 |a Yoshida, T.  |e analytic author 
245 1 0 |a Internal structure of lava flows, Rishiri Volcano 
300 |a p. 181-194 
500 |a In Japanese with English summary. 20 refs. 
500 |a Abstract number: 85M/0991 
500 |a Abstractor: M.Ak. 
500 |a Key title: Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 
500 |a Source note: Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 76(6), p.181-194. Publisher: Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, Sendai, Japan. ISSN: 0021-4825 
500 |a Publication type: journal article 
504 |b 20 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique 
520 |a Three types of vesicular segregated bodies are recognized in the Kutsugata lava flows, Rishiri Volcano, Hokkaido: 'segregation layer', 'segregation cylinder' and 'segregation stock'. In transverse section the segregation layer is a flat-lying parallel banding from several mm to more than 10 cm thick. The segregation cylinder is a slender vertical column, connected with the segregation layer at the upper end of the column. The segregation stock is defined as a pulse or plume segregated from the host lava, and is associated with the segregation layer. These segregated bodies must have formed during consolidation of the lava flows which had ceased to move on the flat ground, in the sequence: segregation layers, segregation cylinders and finally segregation stocks. It is considered that there were three mechanisms of material transport in the Kutsugata lava flows: flow of a viscous liquid in the extension fractures; volatile channelling in the three-phase fluidized system; and diapiric uprise of low density plastic masses. Eight chemical analyses of the segregated bodies were compared with six from their host rocks in a typical thick lava flow, in order to trace the fractionation trends of the magma after extrusion. 
650 7 |a Andesites  |2 georeft 
650 7 |a Basalts  |2 georeft 
650 7 |a Dacites  |2 georeft 
650 7 |a Flow structures  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Lava  |2 georeft 
650 7 |a Lava flows  |2 georeft 
650 7 |a Major elements  |2 georeft 
650 7 |a Modal analysis  |2 georeft 
650 7 |a Petrology  |2 georeft 
650 7 |a Pyroclastics  |2 georeft 
650 7 |a Sedimentary structures  |2 georeft 
650 7 |a Soft sediment deformation  |2 georeft 
650 7 |a Trace elements  |2 georeft 
650 7 |a Volcanic rocks  |2 georeft 
651 7 |a Asia  |2 georeft 
651 7 |a Far East  |2 georeft 
651 7 |a Hokkaido  |2 georeft 
651 7 |a Japan  |2 georeft 
653 |a Rishiri Island 
653 |a Rishiri Volcano 
700 1 |a Yamaguchi, T.,  |e analytic author 
700 1 |a Kawasaki, Y.,  |e analytic author 
773 0 |t Ganseki Kobutsu Kosho Gakkai-Shi Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists  |d Sendai : Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, 1981  |x 0021-4825  |y GKKGA2  |n Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 76(6), p.181-194. Publisher: Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, Sendai, Japan. ISSN: 0021-4825 Publication type: journal article  |g Vol. 76, no. 6  |h illus. incl. 3 tables, geol. sketch map