Taniuchi et al. (2020) A new concept for the genesis of felsic magma: the separation of slab-derived supercritical liquid, Scientific Reports , 10, 8698 , doi:10.1038/s41598-020-65641-6. < 20200609091255-610925 > pub

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

  • abstract:

    Felsic magmas produced at subduction zones have played an important role in the generation and evolution of the continental crust. For the origin of felsic magmas, processes such as fractional crystallization of mafic magmas, partial melting of crustal materials, partial melting of subducting slabs, and partial melting of pyroxenitic mantle wedge components have been proposed. Recent experimental studies have predicted that felsic melt can also be produced in the mantle wedge by the separation of slab-derived supercritical liquid beyond depths corresponding to the critical point. To date, however, the presence of felsic magma of this origin has not yet been reported. In this study, we investigated dacitic lavas and preceding calc-alkaline andesite lavas from the Rishiri Volcano, located at the rear of the Kuril arc. We show that hydrous felsic melt and aqueous fluid were separated from slab-derived supercritical liquid in the mantle wedge. The former erupted as dacitic magma whilst the aqueous fluid induced the generation of primary basaltic magma involved in creating calc-alkaline andesite magma. We infer that slab-derived supercritical liquid is an efficient transport medium for moving silicate-rich components from subducting slabs to the Earth’s surface, and that this process may have contributed to the growth of the continental crust.

  • doi: 10.1038/s41598-020-65641-6
  • modified at 2021-06-03
1: Af 5 2: Af 6 3: Or-9 4: Or-10 5: Y-1 6: Y-2a 7: Y-3 8: Y-8 9: Y-9 10: Y-19 11: Af 1b 12: Af 4b 13: Af 7b 14: Af 9 15: Ho-5 16: KR 4 17: KR 7 18: KR 8 19: KR 18


Tixhr 481973118 thumb KR 4 < 20151113075837-511618 >pub
  • place: N45°11′1.0″, E141°13′26.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 259.89
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 2095136543 thumb KR 8 < 20151113075907-586473 >pub
  • place: N45°11′3.0″, E141°13′7.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 88.18
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 361858254 thumb KR 7 < 20151113080309-071472 >pub
  • place: N45°11′3.0″, E141°13′7.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 421.44
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 2006178251 thumb KR 18 < 20151113080349-508121 >pub
  • place: N45°10′59.0″, E141°11′38.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 629.65
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 232254500 thumb Af 5 < 20151120095027-373393 >pub
  • place: N45°10′55.4″, E141°16′47.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr2053852247 thumb Af 4b < 20151120095615-109461 >pub
  • place: N45°10′53.0″, E141°16′21.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 5031434 thumb Af 1b < 20151120100129-816295 >pub
  • place: N45°10′44.0″, E141°16′52.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr1662639819 thumb Af 7b < 20151120101041-928918 >pub
  • place: N45°10′55.0″, E141°16′12.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 170406374 thumb Af 9 < 20151120101143-272243 >pub
  • place: N45°11′2.0″, E141°15′58.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr739255864 thumb Af 6 < 20151120101211-104397 >pub
  • place: N45°10′58.0″, E141°16′15.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr426045556 thumb Y-1 < 20151126084005-088527 >pub
  • place: N45°11′53.0″, E141°14′29.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr927594983 thumb Y-2a < 20151126084017-799456 >pub
  • place: N45°11′52.0″, E141°16′12.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 79612501 thumb Y-3 < 20151126084043-233642 >pub
  • place: N45°11′52.0″, E141°16′12.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 1241005410 thumb Y-8 < 20151126084152-524252 >pub
  • place: N45°11′53.0″, E141°16′13.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 87051716 thumb Y-9 < 20151126084204-886065 >pub
  • place: N45°11′49.0″, E141°16′7.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr2095050405 thumb Y-19 < 20151126084402-313849 >pub
  • place: N45°11′53.0″, E141°16′13.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 1134254430 thumb Or-9 < 20151126084546-323377 >pub
  • place: N45°10′50.0″, E141°14′29.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 314007776 thumb Or-10 < 20151126084558-188649 >pub
  • place: N45°10′50.0″, E141°14′29.0″ more
  • classification: volcanic:dacitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
Tixhr 1155554740 thumb Ho-5 < 20151127083300-532890 >pub
  • place: N45°9′46.0″, E141°15′57.0″ more
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • status: (unknown)
  • description: Rishiri
  • modified at 2021-01-27
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Table S2. Results of elemental and isotopic analyses for the dacitic lavas from the Rishiri Volcano. pub 20210127045328-918043 major-trace-isotope (Kuritani et al., 2021) 19
Table S3. Th and U isotopic compositions and concentrations of the dacite and andesite lavas. pub 20210127052827-028227 U-series (Kuritani et al., 2007) 11
manual
  • name
  • Taniuchi, Hajime
  • Kuritani, Takeshi
  • Yokoyama, Tetsuya
  • Nakamura, Eizo
  • Nakagawa, Mitsuhiro