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 (> 50 m/yr), and that individual stages of subaerial volcanism are induced by flushing of different fluid batches to the mantle wedge with a periodicity of 1-13 kyr. 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.
| Original language | English |
|---|---|
| Pages (from-to) | 190-195 |
| Number of pages | 6 |
| Journal | Proceedings of the Japan Academy Series B: Physical and Biological Sciences |
| Volume | 78 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Sep 2002 |
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Keywords
- Miyakejima volcano
- Slab dehydration
- Subduction zone
- U-series disequilibria
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- General
- Mathematics(all)
Cite this
Timing and trigger of arc volcanism controlled by fluid flushing from subducting slab. / Yokoyama, Tetsuya; Nakamura, Eizou; Kobayashi, Katsura; Kuritani, Takeshi.
In: Proceedings of the Japan Academy Series B: Physical and Biological Sciences, Vol. 78, No. 7, 09.2002, p. 190-195.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Timing and trigger of arc volcanism controlled by fluid flushing from subducting slab
AU - Yokoyama, Tetsuya
AU - Nakamura, Eizou
AU - Kobayashi, Katsura
AU - Kuritani, Takeshi
PY - 2002/9
Y1 - 2002/9
N2 - 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 (> 50 m/yr), and that individual stages of subaerial volcanism are induced by flushing of different fluid batches to the mantle wedge with a periodicity of 1-13 kyr. 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.
AB - 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 (> 50 m/yr), and that individual stages of subaerial volcanism are induced by flushing of different fluid batches to the mantle wedge with a periodicity of 1-13 kyr. 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.
KW - Miyakejima volcano
KW - Slab dehydration
KW - Subduction zone
KW - U-series disequilibria
UR - http://www.scopus.com/inward/record.url?scp=0036764654&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036764654&partnerID=8YFLogxK
U2 - 10.2183/pjab.78.190
DO - 10.2183/pjab.78.190
M3 - Article
AN - SCOPUS:0036764654
VL - 78
SP - 190
EP - 195
JO - Proceedings of the Japan Academy Series B: Physical and Biological Sciences
JF - Proceedings of the Japan Academy Series B: Physical and Biological Sciences
SN - 0386-2208
IS - 7
ER -