Ota, T. et al. (2008) Tourmaline breakdown in a pelitic system: implications for boron cycling through subduction zones, Contributions to Mineralogy and Petrology, 155, 19-32, doi: 10.1007/s00410-007-0228-2. < 20100403102546564.admin > pub

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

  • abstract:

    Pressure–temperature conditions of tourmaline breakdown in a metapelite were determined by high-pressure experiments at 700–900°C and 4–6 GPa. These experiments produced an eclogite–facies assemblage of garnet, clinopyroxene, phengite, coesite, kyanite and rare rutile. The modal proportions of tourmaline clearly decreased between 4.5 and 5 GPa at 700°C, between 4 and 4.5 GPa at 800°C, and between 800 and 850°C at 4 GPa, with tourmaline that survived the higher temperature conditions appearing corroded and thus metastable. Decreases in the modal abundance of tourmaline are accompanied by decreasing modal abundance of coesite, and increasing that of clinopyroxene, garnet and kyanite; the boron content of phengite increases significantly. These changes suggest that, with increasing pressure and temperature, tourmaline reacts with coesite to produce clinopyroxene, garnet, kyanite, and boron-bearing phengite and fluid. Our results suggest that: (1) tourmaline breakdown occurs at lower pressures and temperatures in SiO2-saturated systems than in SiO2-undersaturated systems. (2) In even cold subduction zones, subducting sediments should release boron-rich fluids by tourmaline breakdown before reaching depths of 150 km, and (3) even after tourmaline breakdown, a significant amount of boron partitioned into phengite could be stored in deeply subducted sediments.

  • doi: 10.1007/s00410-007-0228-2
  • modified at 16 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) B_procedures of Nakamura et al. (1992) on TIMS Thermo-Fisher MAT261
Img 5020 thumb U1K367 < 20120110093022-476-039 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=5.0 GPa, T=700°C, t=50.5h
  • modified at 2020-04-14
Tixhr 530351359 thumb U1K780 < 20181105114932-936574 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.1GPa, T=700°C, t=50h
  • modified at 2020-04-14
Tixhr 1079904145 thumb U1K351 < 20181105114107-391181 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.0GPa, T=800°C, t=12h
  • modified at 2020-04-14
Img 5018 thumb U1K353Au < 20120110093004-550-708 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.0GPa, T=800°C, t=48h
  • modified at 2020-04-14
Tixhr152857188 thumb U1K375 < 20181105114223-204312 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.5GPa, T=700°C, t=24h
  • modified at 2020-04-14
Img 5016 thumb U1K467 < 20120110092952-206-629 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.5GPa, T=750°C, t=30h
  • modified at 2020-04-14
Tixhr 664487974 thumb STARTING MATERIAL < 20181105115440-491299 >pub
  • physical-form: on mount
  • status: (unknown)
  • description: Starting material (SMKT) in Ota et all., 2008
  • modified at 2020-04-14
Tixhr 496686040 thumb U1K394 < 20181105114349-581163 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.5GPa, T=850°C, t=9.3h
  • modified at 2020-04-14
Tixhr 1357837024 thumb U1K359 < 20181105113951-787825 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=6.0GPa, T=800°C, t=12h
  • modified at 2020-04-14
Ti hr1724143252 thumb 91072502-P < 20200131143346-048605 >pub
  • classification: metamorphic
  • physical-form: powder
  • quantity (g): 0.58
  • description: Asemigawa region; metasedimentary rock; used as a starting material in Ota et al., 2008
  • modified at 2020-04-14
Tixhr1392726533 thumb U1K382 < 20181030141142-264402 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.0GPa, T=850°C, t=8h
  • modified at 2020-04-14
Tixhr876889422 thumb U1K380 < 20181030141035-536145 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.0GPa, T=900°C, t=5.2h
  • modified at 2020-04-14
Tixhr1162446952 thumb U1K373 < 20181031135515-399316 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.5GPa, T=800°C, t=8h
  • modified at 2020-04-14
Tixhr306780647 thumb U1K378 < 20181031135623-873714 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=4.5GPa, T=900°C, t=4h
  • modified at 2020-04-14
Tixhr2145321208 thumb U1K364 < 20181031135306-377750 >pub
  • classification: synthetic
  • physical-form: on mount
  • status: (unknown)
  • description: Experimental conditions: P=5.0GPa, T=800°C, t=12.7h
  • modified at 2020-04-14
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name spots global-id
caption ID assembly stone
Table 4 Boron content of phengites in starting metapelite and run product pub 20200203113408-820403 B_SM and run (Ota et al., 2008) 9
Table 3 Chemical compositions of minerals in run products pub 20200203102227-266335 major-run (Ota et al., 2008) 32
Table 2 Experimental results pub 20200131154425-056149 modal_run (Ota et al., 2008) 13
Table 1 Chemical compositions of starting material pub 20200131150253-039485 major-SM (Ota et al., 2008) 2
manual
  • name
  • Ota, T.
  • Kobayashi, Katsura
  • Katsura, T.
  • Nakamura, E.