Takuya Moriguti & Eizo Nakamura (1998) Across-arc variation of Li isotopes in lavas and implicationsfor crust/mantle recycling at subduction zones, Earth and Planetary Science Letters, 163, 167-174, doi:10.1016/S0012-821X(98)00184-8. < 20200213114239-984336 > pub

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

  • abstract:

    Li isotope was analyzed in island arc volcanics from the Izu arc, Japan, to investigate geochemical processes in subduction zones. Li isotope ratios (δ7Li) and Li/Y of the arc lavas show clear across-arc variations, decreasing (δ7Li: +7.6 to +1.1‰, Li/Y: 0.36 to 0.25) with increasing depth to the Wadati–Benioff zone (150 to 210 km). This suggests that the amount of subduction component as a fluid added to the source region decreases with depth. δ7Li–Y/Li systematics of the arc lavas clearly indicate a simple mixing between two distinctive chemically homogenous endmembers, a slab-derived fluid and the mantle wedge. Furthermore, Li–B–Pb isotope systematics allow clear discrimination between the relative contribution of altered oceanic crust (AOC), oceanic sediment and mantle wedge to arc lavas, and suggests that AOC is the dominant subduction component, whereas the contribution of oceanic sediment is extremely small (AOC/oceanic sediment = 97/3). The contrasting physicochemical properties for Li and B in mineral structures imply that Li may be less likely to migrate from the slab into the overlying mantle wedge than B. Thus the Li isotopic composition in the Earth's surface material evolved under near-surface condition, could be more efficiently introduced into the deep mantle through subduction zones than the B isotopic signature, making Li isotopes a powerful geochemical tracer for better understanding of crust/mantle recycling.

  • doi: 10.1016/S0012-821X(98)00184-8
  • modified at 4 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: 16R 1 12: 18R 1


(a) Li isotopes_procedures of Moriguti and Nakamura (1998) on ICPMS Yokogawa PMS2000
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on ICPMS Yokogawa PMS2000
(c) B_procedures of Makishima et al. (1997) on ICPMS Yokogawa PMS2000
(d) Li isotopes_procedures of Moriguti and Nakamura (1998) on TIMS Thermo-Fisher MAT261
(e) B_procedures of Nakamura et al. (1992) on TIMS Thermo-Fisher MAT261
(f) Pb isotopes_procedures of Koide and Nakamura (1990) on TIMS Thermo-Fisher MAT261
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 1607126058 thumb 16R 1 < 20160920142607-593558 >pub
  • place: N22°55′60.0″, W44°57′0.0″ more
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: MORB sample from ODP Hole 648B
  • modified at 2020-04-28
Tixhr 189048042 thumb 18R 1 < 20160920142632-464552 >pub
  • place: N22°55′60.0″, W44°57′0.0″ more
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: MORB sample from ODP Hole 648B
  • modified at 2020-04-28
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
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
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
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
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
name box-type global-id
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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
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JB-3_Li pub TIMS Thermo-Fisher MAT261 1 20200210104217-583867
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JB-3 powder pub ICPMS Yokogawa PMS2000 2 20200213153348-817236
JB-3 powder pub ICPMS Yokogawa PMS2000 1 20200213153336-684968
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16R 1 pub ICPMS Yokogawa PMS2000 1 20200213153337-655842
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JB2-1_B pub TIMS Thermo-Fisher MAT261 2 20191011091956-857703
JB2-2_Pb pub TIMS Thermo-Fisher MAT261 3 20191011093639-992779
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JB2-2_Ra pub TIMS Thermo-Fisher MAT262 4 20191011135602-253524
JB2-2_Sm-Nd pub TIMS Thermo-Fisher MAT261 4 20191011102056-733424
JB2-2_Rb-Sr pub TIMS Thermo-Fisher MAT261 4 20191011101815-177013
JB2-2_Li pub TIMS Thermo-Fisher MAT261 2 20191011095851-447069
JB-3 pub Q-ICPMS Agilent 7500cs 48 20190903121150-057348
JB-3_leached pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100452-639887
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name spots global-id
caption ID rowname stone
Table 1. Trace element contents and isotopic compositions of rocks pub 20200213122342-425194 Li-B-Pb (Moriguti et al., 1998) 12
manual
  • name
  • Takuya Moriguti
  • Eizo Nakamura