Kuritani, Takeshi (1998) Boundary Layer Crystallization in a Basaltic Magma Chamber: Evidence from Rishiri Volcano, Northern Japan, Journal of Petrology, 39, 1619-1640, doi: 10.1093/petroj/39.9.1619. < 20150918110931-256626 > pub

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

  • abstract:

    The evolution of basaltic magma by mushy boundary layer processes in a magma chamber is documented for an alkali basalt (Kutsugata lava) from Rishiri Volcano, northern Japan, on the basis of zoning patterns of plagioclase phenocrysts and their spatial distribution in the lava. Plagioclase phenocrysts with complex zoning patterns can be divided into four types. Type 1 is characterized by an extremely An-rich core (An71–90), which is commonly corroded and filled with sodic plagioclase. Type 2 has an Ab-rich core surrounded by a calcic mantle characteristic of partial dissolution. Type 3 is characterized by an Ab-rich core that is commonly surrounded by a reversely zoned slightly calcic mantle. Type 4 has an Ab-rich core without a calcic mantle. The An-rich cores of the Type 1 plagioclase are too calcic to have crystallized from a liquid represented by any whole-rock composition at the estimated temperatures of the Kutsugata magma system. The An-rich cores are inferred to have been formed in a mushy boundary layer along the wall of a magma chamber, where the magma was relatively cool and rich in water because of significant olivine fractionation and possibly because of addition of water expelled from the chilled margin and/or groundwater from the surrounding crust. The Ab-rich cores of Types 2–4 plagioclase phenocrysts are interpreted to have crystallized in the main magma body of the reservoir. The Types 2 and 3 Ab-rich cores were brought to the mushy layer by convection. The temporal and spatial variations of zoning patterns of plagioclase phenocrysts in basaltic lava flows give useful information on the evolution of mafic magma chambers.

  • doi: 10.1093/petroj/39.9.1619
  • modified at 15 h ago


(a) XRF_procedure of Kushiro (1994) on XRF Philips PW-1480 (Tokyo)
(b) EPMA on EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo)
Tixhr1286665639 thumb Ta-26 < 20151130084246-069488 >pub
  • IGSN: IEDRM008E
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 108.49
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr 1796037154 thumb Km 3a < 20151109090906-874432 >pub
  • IGSN: IEDRM0087
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 523.41
  • description: Kutsugata Lava, South Lava 1 (augite phenocryst-poor lava)
  • modified at 2020-02-13
Tixhr1431859693 thumb Km 7 < 20151109091511-886759 >pub
  • IGSN: IEDRM00KE
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 614.2
  • description: Kutsugata Lava, South Lava 1 (augite phenocryst-poor lava)
  • modified at 2020-02-13
Tixhr1562645636 thumb Km 9 < 20151109091325-601583 >pub
  • IGSN: IEDRM00KF
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 382.97
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr530063400 thumb Km 10 < 20151109091542-644180 >pub
  • IGSN: IEDRM00KG
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 633.2
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr1023603247 thumb Fm-17a < 20151125083843-709246 >pub
  • IGSN: IEDRM008C
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 1184.68
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr572971475 thumb KR 9 < 20151113080017-796937 >pub
  • IGSN: IEDRM0089
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 673.57
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr1978468513 thumb Fm 25 < 20151127090941-281953 >pub
  • IGSN: IEDRM008D
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 140.18
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr1948556639 thumb Ku 18 < 20151124084802-091364 >pub
  • IGSN: IEDRM00KH
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 180.78
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr 513847927 thumb Ku 16 < 20151124084614-855477 >pub
  • IGSN: IEDRM00KI
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 140.43
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr 1268107440 thumb Ku 14 < 20151124084805-557324 >pub
  • IGSN: IEDRM00KJ
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 257.57
  • description: Kutsugata Lava, North Lava
  • modified at 2020-02-13
Tixhr 2107033268 thumb Ku 26 < 20151124084753-669617 >pub
  • IGSN: IEDRM00KK
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 102.51
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr869846244 thumb Ku 10 < 20151124084618-785610 >pub
  • IGSN: IEDRM00KL
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 703.33
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr 607962374 thumb Ku 11 < 20151124084032-633580 >pub
  • IGSN: IEDRM00KM
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 77.63
  • description: Kutsugata Lava
  • modified at 2019-07-02
Tixhr 1097591489 thumb Kr 31 < 20151117090404-228644 >pub
  • IGSN: IEDRM00KN
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 114.97
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr868847096 thumb Kr 27 < 20151116085845-442868 >pub
  • IGSN: IEDRM00KO
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 962.4
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr686500313 thumb Kr 42 < 20151117091222-974032 >pub
  • IGSN: IEDRM00KP
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 273.85
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2020-02-13
Tixhr 1164411195 thumb Kr 33 < 20151117090314-465981 >pub
  • IGSN: IEDRM00KQ
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 146.15
  • description: Kutsugata Lava
  • modified at 2019-07-02
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caption ID assembly stone
Table 1. Major and trace element compositions and modal compositions of representative samples from the Kutsugata lava pub 20190613152858-639471 major-trace (Kuritani et al., 1998) 16
Table 2. Electron microprobe analyses of representative plagioclase crystals pub 20190613155423-678885 major - Pl (Kuritani et al., 1998) 28
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  • name
  • Kuritani, Takeshi