Yokoyama, T. et al. (2002) Timing and trigger of arc volcanism controlled by fluid flushing from subducting slab, Proc. Japan Acad, 78(B), 190-195, doi: 10.2183/pjab.78.190. < 20150911150746-579761 > pub

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

  • abstract:

    We present 238U-230Th-226Ra systematics in lavas from Miyakejima volcano, Izu arc, Japan, together with major element, trace element and Sr-Nd-Pb isotopic compositions, to estimate the timescale of magmatic processes beneath an island arc. 238U-230Th-226Ra disequilibria observed in Miyakejima lavas with large excesses of 238U and 226Ra to 230Th imply metasomatism of depleted mantle by fluid related processes. Our data reveal that fluid components released from the slab ascend rapidly through the mantle wedge (>50m/yr), and that individual stages of subaerial volcanism are induced by flushing of different fluid batches to the mantle wedge with a periodicity of 1-13kyr. This indicates that arc magmatism is controlled by pulsed release of fluid from the slab occurring on such a small timescale, which might be related to the occurrence of earthquakes in the subducting slab.

  • doi: 10.2183/pjab.78.190
  • modified at 2019-07-16
ISEI/main/127/B/1/Miyake F < 20151005091140-479829 >
20120606094101-558-649 Img 6310@2b28bea415305bdc19edde2 thumb 99092704 < 20120606094101-558-649 >pub
  • IGSN: IEDRM00M8
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.815
  • age (a): 57 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), basaltic andesite. (Leave Miyake 14 <20091014093056229.hkitagawa> and enter Miyake F <20151005091140-479829> on 2015-10-05).
  • modified at 2019-07-17
20120606093916-181-212 Img 6300@f7676a1c48ca15133b3b471 thumb 99092710 < 20120606093916-181-212 >pub
  • IGSN: IEDRM00M5
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.725
  • age (a): 1270 (89)
  • description: Eruption Stage 3 (2500 BP-1154 AD), basalt. (Leave Miyake 14 <20091014093056229.hkitagawa> and enter Miyake F <20151005091140-479829> on 2015-10-05).
  • modified at 2019-07-16
20120508095044-052-344 Img 6046@c6772054a266d9cab483090 thumb 99092805 < 20120508095044-052-344 >pub
  • IGSN: IEDRM00M4
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.79
  • age (a): 2050 (0)
  • description: Eruption Stage 3 (2500 BP-1154 AD), basaltic andesite. (Leave Miyake 13 <20091014093057829.hkitagawa> and enter Miyake F <20151005091140-479829> on 2015-10-05).
  • modified at 2019-07-16
ISEI/main/127/B/2/Miyake A < 20151005091019-154745 >
20120604095149-042-287 Img 6245@8a40855ab937ff7807f0c35 thumb 99100110 < 20120604095149-042-287 >pub
  • IGSN: IEDRM00MM
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.32
  • age (a): 36 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), basaltic andesite. (Leave Miyake 2 <20091014093116283.hkitagawa> and enter Miyake A <20151005091019-154745> on 2015-10-05).
  • modified at 2019-07-17
ISEI/main/127/B/3/Miyake G < 20151005091154-456614 >
20120606093958-904-326 Img 6305@89c22f0d622f719f120c477 thumb 99092709 < 20120606093958-904-326 >pub
  • IGSN: IEDRM00MT
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 1.3
  • age (a): 145 (0)
  • description: Eruption Stage 4 (1469 AD - 1983 AD), basaltic andesite. (Leave Miyake 14 <20091014093056229.hkitagawa> and enter Miyake G <20151005091154-456614> on 2015-10-05).
  • modified at 2019-07-17
ISEI/main/127/B/2/Miyake C < 20151005091055-960015 >
20120702093145-221-343 Img 6488 thumb 99092901 < 20120702093145-221-343 >pub
  • IGSN: IEDRM00LU
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 1.245
  • age (a): 376 (0)
  • description: Eruption Stage 4 (1469AD-1983 AD), basaltic andesite. (Leave Miyake 9 <20091014093104588.hkitagawa> and enter Miyake C <20151005091055-960015> on 2015-10-05).
  • modified at 2019-07-17
ISEI/main/127/B/2/Miyake B < 20151005091037-838985 >
20120601094628-970-279 Img 6220@5cbfe1640e7e73cc6cd405a thumb 99100115 < 20120601094628-970-279 >pub
  • IGSN: IEDRM00MX
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.735
  • age (a): 1157 (24)
  • description: Eruption Stage 3 (2500 BP-1154 AD), basalt
  • modified at 2019-07-17
20120507104914-451-335 Img 1902@703f88f6f5eb0a6d95afbaf thumb 99100116 < 20120507104914-451-335 >pub
  • IGSN: IEDRM00MY
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.935
  • age (a): 1157 (24)
  • description: Eruption Stage 3 (2500 BP-1154 AD), basaltic andesite.
  • modified at 2019-07-16
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99092805 pub TIMS Thermo-Fisher MAT261/262 3 20190604111449-663340
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name spots global-id
caption assembly stone
Table 1. Ra-Th ages for Miyakejima lavas of Stage 3 and 4 pub Ra-Th age (Yokoyama et al., 2002) 8
manual
  • name
  • Yokoyama, T.
  • Nakamura, E.
  • Kobayashi, K.
  • Kuritani, T.