Ishikawa, Tsuyoshi & Nakamura, Eizo (1994) Origin of the slab component in arc lavas from across-arc variation of B and Pb isotopes, Nature, 370, 205-208, doi:10.1038/370205a0. < 20200214153621-126287 > pub

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

  • abstract:

    AT convergent margins, the subducting oceanic slab is thought to dehydrate, producing fluids which metasomatize the overlying mantle wedge where island-arc magma forms. However, the nature and origin of the metasomatizing fluid, its source composition and its relation to the genesis of the chemical characteristics of arc magmas are largely controversial. Across-arc variation in the chemistry of arc lavas provides a useful key to this problem, because it may reflect the changes in the physical conditions of the subducting slab that control mass transfer from slab to mantle wedge as a function of depth. Here we report clear across-arc variations in the concentrations and isotopic compositions of boronand lead observed in lavas from the Izu arc (Japan). Our data suggest that a homogeneous slab fluid contributes to all Izu volcan-oes, but that the amount of this fluid decreases continuously with increasing depth of the subducting slab. Whereas the Izu slab fluid conies primarily from altered oceanic crust, our data for high-Mg andesites from the Setouchi volcanic belt (a nearby fore-arc) indicate a significant involvement of sediment in the fluid source.

  • doi: 10.1038/370205a0
  • modified at 12 h ago
1: OSF1 2: JB-2 3: JA-1 4: JB-3 powder 5: TO-2 6: NIW-1 7: SHK-1 8: KOZ4-2 9: 89052605 10: 89052606 11: 89052607m


(a) XRF on XRF PANalytical PW2400
(b) B_procedures of Nakamura et al. (1992) on TIMS Thermo-Fisher MAT261
(c) Pb isotopes_procedures of Koide and Nakamura (1990) on TIMS Thermo-Fisher MAT261
Img 8252@58452bedef311c2498f872f thumb JB-2 < 20130416090250-887738 >pub
  • classification: volcanic:basaltic
  • physical-form: powder
  • status: (unknown)
  • description: Geological Survey of Japan silicate reference material - tholeiitic basalt from Izu-Oshima, Japan (erupted in 1950 AD); split 7, position 19
  • modified at 2020-06-16
Img 8250@755d2b606566c71e7090e42 thumb JA-1 < 20130416090234-228760 >pub
  • classification: volcanic:andesitic
  • physical-form: powder
  • status: (unknown)
  • description: Geological Survey of Japan silicate reference material - andesite from Hakone volcano ; split 7, position 19
  • modified at 2020-06-16
Tixhr37184949 thumb TO-2 < 20160920141150-533649 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Izu arc lava; depth to Wadati-Benioff zone is 180 km
  • modified at 2020-05-01
Tixhr1524046781 thumb NIW-1 < 20160920141420-748040 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Izu arc lava; depth to Wadati-Benioff zone is 185 km
  • modified at 2020-05-01
Tixhr 1884858858 thumb SHK-1 < 20160920141334-325592 >pub
  • classification: volcanic:rhyolitic
  • physical-form: thin section
  • status: (unknown)
  • description: Izu arc lava; depth to Wadati-Benioff zone is 200 km
  • modified at 2020-05-01
Tixhr 424989004 thumb KOZ4-2 < 20160920141251-556326 >pub
  • classification: volcanic:rhyolitic
  • physical-form: thin section
  • status: (unknown)
  • description: Izu arc lava; depth to Wadati-Benioff zone is 210 km
  • modified at 2020-05-01
Tixhr 109088430 thumb OSF1 < 20160920141055-180059 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Izu arc lava; depth to Wadati-Benioff zone is 150 km
  • modified at 2020-05-01
Tixhr 1256875770 thumb 89052607m < 20160720140930-188793 >pub
  • classification: sedimentary
  • physical-form: hand specimen
  • quantity (g): 79.34
  • description: Shikoku, Shimanto Belt; shale
  • modified at 2020-05-01
Tixhr2083512092 thumb 89052606 < 20160720141311-243664 >pub
  • classification: sedimentary
  • physical-form: hand specimen
  • quantity (g): 178.05
  • description: Shikoku, Shimanto Belt; shale
  • modified at 2020-05-01
Tixhr 2049412143 thumb 89052605 < 20160720141200-870302 >pub
  • classification: sedimentary
  • physical-form: hand specimen
  • quantity (g): 130.8
  • description: Shikoku, Shimanto Belt; shale
  • modified at 2020-05-01
Tixhr1947484362 thumb JB-3 powder < 20170620122529-773001 >pub
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 1.56
  • description: Geological Survey of Japan silicate reference material - basaltic rock from Mt.Fuji
  • modified at 2020-05-15
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JB-3_K/Rb pub 1 20190521103319-957023
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JB-3_B pub ICPMS Yokogawa PMS2000 1 20190604100950-466668
JB-3_TE pub ICPMS Yokogawa PMS2000 27 20190604101141-927713
JB-3_Pb-Max2007 pub ICPMS Thermo-Fisher Neptune 3 20191023142827-497265
JB-3_Pb pub TIMS Thermo-Fisher MAT261/262 3 20190604111451-846233
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JB-3_Ra-Th pub TIMS Thermo-Fisher MAT262 2 20190604112019-529602
JB-3 powder_Bi-Tl-In-Cd pub Q-ICPMS Agilent 7500cs 4 20191002151232-358462
JB-3 powder_d66Zn pub ICPMS Thermo-Fisher Neptune 1 20191003102338-786951
JB-3 powder_d56Fe pub ICPMS Thermo-Fisher Neptune 1 20191003113551-869058
JB-3_Pb-Kuritani2006 pub TIMS Thermo-Fisher MAT261 6 20191021120551-635445
JB-3 powder_Ge-As-Se-Te pub Q-ICPMS Agilent 7500cs 4 20191004111800-712270
JB-3 powder_TE_Max2006 pub Q-ICPMS Agilent 7500cs 42 20191018153909-515065
JB-3_S pub HR-ICPMS Finningan, Element 1 20191008141043-867533
JB-3_Cr-Ni-Cu-Zn pub HR-ICPMS Finningan, Element 4 20191009100320-202959
JB-3 powder pub MC-ICP-MS Finnigan, Neptune 1 20191219094725-478773
JB-3_S (Max, 2012) pub ICPMS Thermo-Fisher Neptune 1 20191223153137-826757
JB-3_Hf pub MC-ICP-MS Finnigan, Neptune 4 20200130145207-610371
JB-3_226Ra pub MC-ICP-MS Finnigan, Neptune 1 20200131113011-012974
JB-3_Pb pub MC-ICP-MS Finnigan, Neptune 3 20200130150729-103990
JB-3_Sr pub MC-ICP-MS Finnigan, Neptune 1 20200130153547-774326
JB-3_Sr pub TIMS Thermo-Fisher MAT262 1 20200130153702-319024
JB-3_Nd pub MC-ICP-MS Finnigan, Neptune 1 20200130154012-816833
JB-3_Nd pub TIMS Thermo-Fisher Triton 1 20200130154048-265743
JB-3_Li pub TIMS Thermo-Fisher MAT261 1 20200210104217-583867
JB-3_Pb-Kuritani2004 pub TIMS Thermo-Fisher MAT261 3 20200210145900-045643
JB-3 powder pub ICPMS Yokogawa PMS2000 2 20200213153348-817236
JB-3 powder pub ICPMS Yokogawa PMS2000 1 20200213153336-684968
JB-3 powder pub ICPMS Yokogawa PMS2000 1 20200213153400-904724
JB-3 powder pub TIMS Thermo-Fisher MAT261 1 20200213153411-981119
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89052606 pub TIMS Thermo-Fisher MAT261 1 20200213153411-623479
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89052605 pub ICPMS Yokogawa PMS2000 1 20200213153337-447644
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89052605 pub ICPMS Yokogawa PMS2000 1 20200213153401-070000
89052605 pub TIMS Thermo-Fisher MAT261 1 20200213153411-356509
89052605 pub TIMS Thermo-Fisher MAT261 2 20200213153422-163531
89052605 pub TIMS Thermo-Fisher MAT261 4 20200213153432-990986
JB2-1_Sm-Nd pub TIMS Thermo-Fisher MAT261 4 20191011101646-745665
JB2-2_B pub TIMS Thermo-Fisher MAT261 2 20191011092231-398963
JB2-2_Pb pub TIMS Thermo-Fisher MAT261 3 20191011093639-992779
JB2-1_Pb pub TIMS Thermo-Fisher MAT261 3 20191011093459-383699
JB2-1_B pub TIMS Thermo-Fisher MAT261 2 20191011091956-857703
JB-3 pub Q-ICPMS Agilent 7500cs 48 20190903121150-057348
JB-3_leached pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100452-639887
JB2-2_Ra pub TIMS Thermo-Fisher MAT262 4 20191011135602-253524
JB2-2_Sm-Nd pub TIMS Thermo-Fisher MAT261 4 20191011102056-733424
JB-3_leached pub TIMS Thermo-Fisher MAT261 1 20190521101551-819463
JB2-2_Rb-Sr pub TIMS Thermo-Fisher MAT261 4 20191011101815-177013
JB2-2_Li pub TIMS Thermo-Fisher MAT261 2 20191011095851-447069
JB2-1_Ra pub TIMS Thermo-Fisher MAT262 4 20191011135228-878050
JB2-1_Rb-Sr pub TIMS Thermo-Fisher MAT261 4 20191011101511-959093
JB2-1_Li pub TIMS Thermo-Fisher MAT261 2 20191011095740-854602
name spots global-id
caption ID rowname stone
Table 1. Major-and trace-element contents and isotopic compositions of rocks pub 20200214155306-890936 B-Pb (Ishikawa et al., 1994) 11
manual
  • name
  • Ishikawa, Tsuyoshi
  • Nakamura, Eizo