Kuritani, T. et al. (2003) Shift and rotation of composition trends by magma mixing: 1983 eruption at Miyake-jima volcano, Japan, Journal of Petrology, 44, 1895-1916, doi: 10.1093/petrology/egg063. < 20150911160240-685925 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Pre-eruption processes are investigated for magmas erupted in 1983 from Miyake-jima volcano, which is one of the most active volcanoes in Japan. The whole-rock compositional trends of the eruptive products are principally smooth and linear. Magmas erupted from some fissures have compositions that deviate from the main linear trend. Phenocryst contents of samples displaced from the linear compositional trends are significantly lower than those of samples on the main trends. Anorthite-rich plagioclase phenocrysts, present throughout the 1983 products, are too calcic to have crystallized from the erupted magma composition, and were derived from a basaltic magma through magma mixing. Although the linear whole-rock composition trends favor simple two-component magma mixing, this cannot explain the presence of samples that deviate from the main trend. Instead, the observed composition trends were formed by mixing of a homogeneous basaltic magma with andesitic magmas exhibiting compositional diversity. The original linear composition trends of the andesitic end-member magma were rotated and shifted to the direction of the basaltic end-member magma by magma mixing. The samples out of the main trends represent magmas with less basaltic component than those on the trend. The density and viscosity of the basaltic end-member magma were comparable with those of the andesitic end-member magmas. The basaltic magma, discharged from one magma chamber at ∼2 kbar pressure, was injected into a magma chamber at lower pressure occupied by the chemically zoned andesite magma (∼1 kbar), and possibly as a fountain. To establish the characteristic mixing trend of the 1983 magma, the basaltic component must have been distributed systematically in the zoned andesite magma. A requirement is that the basaltic magma spread laterally and mixed with the andesite magma at various levels of ascent of the fountain in the host andesite magma. Analysis of compositional zoning in titanomagnetite crystals revealed that the eruption of the 1983 magmas was initiated soon after the replenishment of the basaltic magma in the 1 kbar magma chamber.

  • doi: 10.1093/petrology/egg063
  • modified at 2019-07-16
ISEI/main/127/B/2/Miyake B < 20151005091037-838985 >
20120601094732-167-308 Img 6229@2f315b11987b542af35ef9b thumb 99100122 < 20120601094732-167-308 >pub
  • IGSN: IEDRM00N8
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.14
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater C-E (lava flowed down to the west), basaltic andesite.
  • modified at 2019-07-16
20120518093544-662-125 Img 6170@fe4634f287a26eefa56faed thumb 99093019 < 20120518093544-662-125 >pub
  • IGSN: IEDRM00MZ
  • classification: volcanic:basaltic
  • physical-form: fraction
  • quantity (kg): 0.525
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), basaltic andesite.
  • modified at 2019-07-17
ISEI/main/127/B/2/Miyake A < 20151005091019-154745 >
20120509095701-002-388 Img 6084@6fe21dd7c72dcdac3656617 thumb 99093043 < 20120509095701-002-388 >pub
  • IGSN: IEDRM00N9
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.46
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater C-E (lava flowed down to the west), basaltic andesite.
  • modified at 2019-07-16
20120509095454-533-439 Img 6068@af1c84443d50a8aeff5abc6 thumb 99093024 < 20120509095454-533-439 >pub
  • IGSN: IEDRM00NA
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.48
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater C-E (lava flowed down to the west), basaltic andesite.
  • modified at 2019-07-16
20120604095224-880-672 Img 6251@f88e12a4001e0edf23c98ab thumb 99100107 < 20120604095224-880-672 >pub
  • IGSN: IEDRM00NB
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.29
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater A (lava flowed down to the west), basaltic andesite.
  • modified at 2019-07-17
ISEI/main/127/B/3/Miyake H < 20151005091230-322642 >
20120705094551-717-998 Img 6530@26528b14a8d1de645a85bbf thumb 99100146 < 20120705094551-717-998 >pub
  • IGSN: IEDRM00NC
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.72
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater J, K (lava flowed down to the SW), basaltic andesite.
  • modified at 2019-07-17
20120705094706-519-575 Img 6541@c9caf7e3cee69f70a83ff55 thumb 99100149 < 20120705094706-519-575 >pub
  • IGSN: IEDRM00ND
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.345
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater J, K (lava flowed down to the SW), basaltic andesite.
  • modified at 2019-07-17
20120705094545-363-567 Img 6529@338f004ae9e768729f22232 thumb 99100142 < 20120705094545-363-567 >pub
  • IGSN: IEDRM00NF
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.575
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater H, I (lava flowed down to the SW), basaltic andesite.
  • modified at 2019-07-17
ISEI/main/127/B/3/Miyake K < 20151005102059-994148 >
20120620092745-920-807 Img 6420@4eb3b422db44cead673693c thumb 99100317 < 20120620092745-920-807 >pub
  • IGSN: IEDRM00NG
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.63
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater G (lava flowed down to the SW), basaltic andesite.
  • modified at 2019-07-17
20120620092646-164-432 Img 6411@6b6a524938d37470794f855 thumb 99100305 < 20120620092646-164-432 >pub
  • IGSN: IEDRM00NH
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.315
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater S (scoria), basaltic andesite.
  • modified at 2019-07-16
ISEI/main/127/B/1/Miyake I < 20151005091248-768834 >
20120705094731-770-926 Img 6545@378a9d95112830cbe081b27 thumb 99100155 < 20120705094731-770-926 >pub
  • IGSN: IEDRM00NE
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.545
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater J, K (lava flowed down to the SW), basaltic andesite.
  • modified at 2019-07-17
ISEI/main/127/B/2/Miyake E < 20151005091125-003717 >
20120703095444-307-869 Img 6504 thumb 99100136 < 20120703095444-307-869 >pub
  • IGSN: IEDRM00KW
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.31
  • age (a): 36 (0)
  • description: Miyakejima volcano, Eruption Stage 4 (1469 AD - 1983 AD), crater H, I (lava flowed down to the SW), basaltic
  • modified at 2019-07-17
20120703095504-429-085 Img 6507 thumb 99100138 < 20120703095504-429-085 >pub
  • IGSN: IEDRM00KX
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.35
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), crater H, I (lava flowed down to the SW), basaltic
  • modified at 2019-07-17
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name spots global-id
caption assembly stone
Table 1. Whole-rock compositions of the representative samples of 1983 products pub major-trace (Kuritani et al., 2003) 12
Table 2. Whole-rock isotopic compositions of the representative samples of 1983 products pub Sr-Nd-Pb-isotopes (Kuritani et al., 2003) 12
manual
  • name
  • Kuritani, T.
  • Yokoyama, T.
  • Kobayashi, K.
  • Nakamura, E.