Katsura Kobayashi & Eizo Nakamura (2001) Geochemical Evolution of Akagi Volcano, NE Japan: Implications for Interaction Between Island-arc Magma and Lower Crust, and Generation of Isotopically Various Magmas, Journal of Petrology, 42, 2303-2331, doi: 10.1093/petrology/42.12.2303. < 20150910173621-641505 > pub

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

  • abstract:

    Major and trace element, and Sr, Nd and Pb isotopic compositions were determined for whole-rock samples from the ‘isotopically anomalous’ Akagi volcano in the volcanic front of the NE Japan arc. Sr and Nd isotopic compositions of phenocrysts were also analyzed together with their major and trace element compositions. Compared with the other volcanoes from the volcanic front, the whole-rock isotope compositions of Akagi show highly enriched characteristics; 87Sr/86Sr = 0.7060–0.7088, εNd = −0.40 to −8.6, and 208Pb/204Pb = 38.4–38.8. The rare earth element (REE) patterns are characterized by heavy REE (HREE) depletions with U-shaped patterns from middle REE (MREE) to HREE, suggesting that amphibole fractionation was induced by a reaction between clinopyroxene and H2O-rich magma in the lower crust. The integrated isotope and trace elements systematics, and tectonic structure beneath Akagi volcano, suggest that lower-crustal assimilation by the H2O-rich primary magma could have been affected by the double subduction of Philippine Sea and Pacific oceanic plates. This double subduction could have supplied larger amounts of water to the magma source region in the wedge mantle than in the case of a single subduction zone. Significant differences in isotopic compositions are observed between phenocrysts and the coexisting melts. Such isotopic disequilibrium may have resulted from magma mixing between an isotopically depleted aphyric and an enriched porphyritic magma in a shallow magma chamber. The geochemical characteristics of these end-member magmas were retained in the lower crust, despite differing extents of lower-crustal assimilation by the H2O-rich magmas.

  • doi: 10.1093/petrology/42.12.2303
  • modified at 2019-07-11
ISEI/main/126/A/6/Akagi 1 < 20091214094509120.hkitagawa >
20120418093831-788-095 Img 5854@54bdf13bff24d0806ff6e3e thumb 2604 < 20120418093831-788-095 >pub
  • IGSN: IEDRM00JU
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 19.6
  • description: Lava of Om stage (older stratovolcano formation stage, middle substage)
  • modified at 2019-07-11
20120418093750-151-710 Img 5849@01f51cf64676172bd1b7a90 thumb 2605 < 20120418093750-151-710 >pub
  • IGSN: IEDRM00JV
  • classification: volcanic
  • physical-form: powder
  • quantity (g): 28.55
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20120418093838-627-775 Img 5855@a97fc35d407580860b73c5f thumb 2603B < 20120418093838-627-775 >pub
  • IGSN: IEDRM00JW
  • classification: volcanic
  • physical-form: powder
  • quantity (g): 18.02
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20120418093758-193-659 Img 5850@423f965abe7942185e52130 thumb 2603G < 20120418093758-193-659 >pub
  • IGSN: IEDRM00JX
  • classification: volcanic
  • physical-form: powder
  • quantity (g): 7.05
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20120418093823-794-994 Img 5853@015e821f07bf9c5ffbe890d thumb 2601 < 20120418093823-794-994 >pub
  • IGSN: IEDRM00JY
  • classification: volcanic
  • physical-form: powder
  • quantity (g): 1.25
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20120418093806-206-968 Img 5851@13c825bcc0eb129f1537361 thumb 2602F < 20120418093806-206-968 >pub
  • IGSN: IEDRM00JZ
  • classification: volcanic
  • physical-form: powder
  • quantity (g): 12.5
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20120418093651-655-932 Img 5842@574c3637c0f3bf1246ec3f6 thumb 1102 < 20120418093651-655-932 >pub
  • IGSN: IEDRM00K0
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 2.74
  • description: Lava of Ol stage (older stratovolcano formation stage, late substage)
  • modified at 2019-07-11
20120418093310-581-676 Img 5816@1d4a84600be58b7e1ea1675 thumb 1010 < 20120418093310-581-676 >pub
  • IGSN: IEDRM00K1
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 1.07
  • description: Lava of Ol stage (older stratovolcano formation stage, late substage)
  • modified at 2019-07-11
20120418093447-647-172 Img 5827@1dcf9c4a35065819cc2caf0 thumb 0910 < 20120418093447-647-172 >pub
  • IGSN: IEDRM00K2
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 1.6
  • description: Lava of Ol stage (older stratovolcano formation stage, late substage)
  • modified at 2019-07-11
20120418093251-212-363 Img 5814@a90ff19817c67f3faabfcec thumb 1012 < 20120418093251-212-363 >pub
  • IGSN: IEDRM00K3
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 3.0
  • description: Lava of Ol stage (older stratovolcano formation stage, late substage)
  • modified at 2019-07-11
20120418093627-731-284 Img 5839@976694ba842e4fef49dc01c thumb A < 20120418093627-731-284 >pub
  • IGSN: IEDRM00K4
  • classification: volcanic:andesitic
  • physical-form: powder
  • quantity (g): 5.46
  • description: Lava of Ol stage (older stratovolcano formation stage, late substage)
  • modified at 2019-07-11
ISEI/stone storage/Room B/C/Akagi 2 < 20121113084812-822-225 >
20121113085651-121-831 Img 7302 thumb 1303 < 20121113085651-121-831 >pub
  • IGSN: IEDRM00K5
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.195
  • description: Lava of Oe stage (older stratovolcano formation stage, early substage)
  • modified at 2019-07-11
20121113085707-695-715 Img 7304 thumb 2603W < 20121113085707-695-715 >pub
  • IGSN: IEDRM00K6
  • classification: volcanic
  • physical-form: aliquot
  • quantity (kg): 0.21
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
20121113085722-826-223 Img 7306 thumb 1103 < 20121113085722-826-223 >pub
  • IGSN: IEDRM00K7
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.165
  • description: Lava of Om stage (older stratovolcano formation stage, middle substage)
  • modified at 2019-07-11
20121113085659-337-123 Img 7303 thumb 1302 < 20121113085659-337-123 >pub
  • IGSN: IEDRM00K8
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.525
  • description: Lava of Oe stage (older stratovolcano formation stage, early substage)
  • modified at 2019-07-11
20121113085715-324-637 Img 7305 thumb 1002 < 20121113085715-324-637 >pub
  • IGSN: IEDRM00K9
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.335
  • description: Lava of Om stage (older stratovolcano formation stage, middle substage)
  • modified at 2019-07-11
20121113085627-193-927 Img 7299 thumb 1004 < 20121113085627-193-927 >pub
  • IGSN: IEDRM00KA
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.16
  • description: Lava of Om stage (older stratovolcano formation stage, middle substage)
  • modified at 2019-07-11
20121113085635-908-881 Img 7300 thumb 1011 < 20121113085635-908-881 >pub
  • IGSN: IEDRM00KB
  • classification: volcanic:andesitic
  • physical-form: aliquot
  • quantity (kg): 0.405
  • description: Lava of Om stage (older stratovolcano formation stage, middle substage)
  • modified at 2019-07-11
20121113085617-897-159 Img 7298 thumb 0807 < 20121113085617-897-159 >pub
  • IGSN: IEDRM00KC
  • classification: volcanic
  • physical-form: aliquot
  • quantity (kg): 0.335
  • description: Lava and pumice of Cc stage (central cone formation stage)
  • modified at 2019-07-11
20121113085602-819-016 Img 7296 thumb 1202 < 20121113085602-819-016 >pub
  • IGSN: IEDRM00KD
  • classification: volcanic
  • physical-form: aliquot
  • quantity (kg): 0.24
  • description: Pyroclastics of Y stage (younger stratovolcano formation stage)
  • modified at 2019-07-11
name latitude longitude global-id
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name spots global-id
caption assembly stone
Table 1. Phenocryst assemblages and modal compositions of the studied samples pub mode (Kobayashi et al., 2001) 20
Table 2. Major and trace element compositions of whole-rock samples from Akagi volcano pub major-trace (Kobayashi et al., 2001) 20
Table 3. Sr, Nd and Pb isotpic compositions of whole-rock samples from Akagi volcano pub Sr-Nd-Pb-isotopes (Kobayashi et al., 2001) 20
Table 4. Trace element compositions of phenocrysts from Ol stage samples obtained by ion microprobe pub trace_minerals (Kobayashi et al., 2001) 30
Table 5. Isotopic analyses of phenocrysts in Ol stage samples pub Sr-Nd-isotopes_minerals (Kobayashi et al., 2001) 15
manual
  • name
  • Katsura Kobayashi
  • Eizo Nakamura