Moriguti, Takuya et al. (2004) Lithium, boron and lead isotope and trace element systematics of Quaternary basaltic volcanic rocks in northeastern Japan: mineralogical controls on slab-derived fluid composition, Chemical Geology, 212, 81-100, doi: 10.1016/j.chemgeo.2004.08.005. < 20191011155033-093869 > pub

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

  • abstract:

    Across-arc Li–B–Pb isotope systematics, together with trace element geochemistry and phase relationships in subducting slabs are used to understand the petrogenesis of lavas from the northeastern Japan arc. Pb/Nb ratios and Pb isotope compositions of the arc lavas decrease with depth to slab whereas Li/Y, U/Nb, Th/Nb and La/Sm show an upward profile across the arc, with peaks at 180 km depth to the Wadati–Benioff zone (WBZ). The peaks in these profiles may reflect the influence of lawsonite breakdown in the slab at 180 km depth. B/Nb ratios of the arc lavas do not show clear across-arc variation and the δ11B values show a concave upward across-arc profile with minimum values at around 180 km in depth of the WBZ. These results possibly reflect the decomposition of tourmaline at ∼180 km. Our results suggest that accessory minerals and minor phases in the subducting slab play important roles in determining the chemical compositions of fluid released by dehydration, and the resulting trace element and isotope composition of arc lavas. Li isotope compositions of the lavas are MORB-like and do not show systematic across-arc variation, contrasting with Izu arc lavas, which show maximum δ7Li values at the volcanic front and a systematic decrease towards the back arc. The strikingly different results for the northeastern Japan arc and the Izu arc are likely to be caused by differing extents of Li isotope fractionation due to differing subduction zone physical characteristics, such as thermal structure of the subducting slab and subduction angle. Thus, not only chemical characteristics of the subducting slab but also the physical, as well as chemical characteristics of the subduction zone could affect the Li isotope compositions of subducting slabs, producing heterogeneity in the Li isotope composition of the mantle.

  • doi: 10.1016/j.chemgeo.2004.08.005
  • modified at 4 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Li isotopes_procedures of Moriguti and Nakamura (1998) on ICPMS Yokogawa PMS2000
(c) B_procedures of Makishima et al. (1997) on ICPMS Yokogawa PMS2000
(d) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on ICPMS Yokogawa PMS2000
(e) Li isotopes_procedures of Moriguti and Nakamura (1998) on TIMS Thermo-Fisher MAT261
(f) B_procedures of Nakamura et al. (1992) on TIMS Thermo-Fisher MAT261
(g) Pb isotopes_procedures of Koide and Nakamura (1990) on TIMS Thermo-Fisher MAT261
Tixhr 409966943 thumb K3-1 < 20160726135151-605877 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Kampu volcano; the depth of the subducting slab is 180 km
  • modified at 2020-04-17
Tixhr 559961407 thumb K3-2 < 20160726135257-041955 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Kampu volcano; the depth of the subducting slab is 180 km
  • modified at 2020-04-17
Tixhr1894846440 thumb 4 8930804-1 < 20160726134902-222139 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Chokai volcano; the depth of the subducting slab is 174 km
  • modified at 2020-04-17
Tixhr 1048756294 thumb 1 83606-2 < 20160726135030-004544 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Chokai volcano; the depth of the subducting slab is 174 km
  • modified at 2020-04-17
Tixhr 1240877774 thumb K3-3 < 20160726135403-364191 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Kampu volcano; the depth of the subducting slab is 180 km
  • modified at 2020-04-17
Img 4805 thumb FUN07-01 < 20111114094624-509-552 >pub
  • IGSN: IEDRM00XX
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 28.17
  • description: Funagata volcano; the depth of the subducting slab is 135 km
  • modified at 2020-04-17
Img 4787 thumb 82928-3 < 20111109093647-366-475 >pub
  • IGSN: IEDRM00XY
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 46.1
  • description: Kayou volcano; the depth of the subducting slab is 145 km
  • modified at 2020-04-17
Img 4783 thumb 82929-2 < 20111109093615-114-793 >pub
  • IGSN: IEDRM00XZ
  • classification: volcanic:basaltic
  • physical-form: aliquot
  • quantity (g): 28.25
  • description: Kayou volcano; the depth of the subducting slab is 145 km
  • modified at 2020-04-17
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Table 1. Major and trace elements, Li–B–Pb isotpic compositions of studied samples pub 20191015100705-481796 major-trace-isotope (Moriguti et al., 2004) 8
manual
  • name
  • Moriguti, Takuya
  • Shibata, T.
  • Nakamura, E.