Ryu, S. et al. (2013) K-Ar analyses of the post-caldera lavas of Bratan volcano in Bali Island, Indonesia - Ar isotope mass fractionation to light isotope enrichment, Journal of Volcanology and Geothermal Research, 264, 107-116, doi: 10.1016/j.jvolgeores.2013.07.002. < 20150916080446-153762 > pub

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

  • abstract:

    The post-caldera lavas of Bratan volcano in Bali island, Indonesia were collected for whole rock chemical analyses and K-Ar analyses. Major and trace element chemistry shows that the lavas basalts to andesites and typical of subduction-related tectonic setting. The 38Ar/36Ar ratios are 0.1851 ± 3-0.1875 ± 2 and the 40Ar/36Ar, 294.3 ± 0.3-301.6 ± 0.1, which strongly suggest that the mass fractionation to light isotope enrichment took place. The effect of the groundwater on magma is common on the basis of systematic mass fractionation of the atmospheric Ar enriched in lighter isotopes. This case was under the mass fractionation law analyzed numerically, giving the mass fractionation correction ages (14 ± 15, 31 ± 6, 55 ± 22, 66 ± 23, 94 ± 32 and 125 ± 51 ka) consistent with the volcano stratigraphy though the magma composition that changed frequently in time.

  • doi: 10.1016/j.jvolgeores.2013.07.002
  • modified at 2 h ago


(a) XRF (0) on XRF PANalytical PW2400
(b) EPMA on EPMA JEOL JXA-8900R (Okayama University of Science)
(c) ICPMS (0) on Q-ICPMS Agilent 7500cs


(a) Flame emission spectrometry on Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science)
(b) mass spectrometry without 38Ar spike on Micromass VG5400
(c) on Micromass VG5400


(a) XRF (0) on XRF PANalytical PW2400
(b) EPMA on EPMA JEOL JXA-8900R (Okayama University of Science)
090924-01 < 20180607094136-338167 >pub
  • IGSN: IEDRM001R
  • place: S8°12′20.7″, E115°8′8.9″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • status: (lost)
  • age (ka): 400 (58)
  • description: parent (non-existence)
  • modified at 2018-06-08
090729-1 < 20180607152951-319653 >pub
  • IGSN: IEDRM00E9
  • place: S8°14′18.5″, E115°8′40.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • status: (lost)
  • age (ka): 125 (51)
  • description: parent (non-existence)
  • modified at 2019-05-08
Img 7000@e9150b96e9dd54bc5a62885 thumb 090727-1 < 20121001090249-595-430 >pub
  • IGSN: IEDRM001Q
  • place: S8°19′44.3″, E115°8′48.7″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.42
  • age (ka): <29
  • description: parent
  • modified at 2018-06-08
Img 6996@194e7b38c26ca3f2b4c735e thumb 090925-2 < 20121001090217-021-419 >pub
  • IGSN: IEDRM001M
  • place: S8°17′12.6″, E115°5′29.3″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 1.04
  • age (ka): 94 (32)
  • description: parent
  • modified at 2018-06-08
Img 6999@0e586e2f99c2bc34a8ffd4c thumb 090728-3 < 20121001090241-946-516 >pub
  • IGSN: IEDRM001P
  • place: S8°18′30.1″, E115°8′49.5″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.76
  • age (ka): 55 (22)
  • description: parent
  • modified at 2018-06-08
Img 6997@86742c1e988fcdca6c4017e thumb 090728-2C < 20121001090224-972-830 >pub
  • IGSN: IEDRM001N
  • place: S8°16′2.7″, E115°6′4.5″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.93
  • age (ka): 31 (6)
  • description: parent
  • modified at 2018-06-08
Img 6998@9877803714b86ee3dd16456 thumb 090728-5 < 20121001090234-805-139 >pub
  • IGSN: IEDRM001O
  • place: S8°16′41.3″, E115°8′35.9″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.745
  • age (ka): 66 (23)
  • description: parent
  • modified at 2018-06-08
name box-type global-id
binder of K-Ar analyses of the post-caldera lavas of Bratan volcano in Bali Island, Indonesia - Ar isotope mass fractionation to light isotope enrichment pub container 20160212153942-893271
name latitude longitude global-id
locality of 090727-1 pub 8.3290 S 115.1469 E 20180531093154-735149
locality of 090728-2C pub 8.2674 S 115.1012 E 20180531103906-503761
locality of 090728-5 pub 8.2781 S 115.1433 E 20180531104031-182843
locality of 090729-1 pub 8.2385 S 115.1444 E 20180607153247-348029
locality of 090728-3 pub 8.3084 S 115.1471 E 20180531103950-209859
locality of 090925-2 pub 8.2868 S 115.0915 E 20180531104134-921575
locality of 090924-01 pub 8.2058 S 115.1358 E 20180605090829-889963
name device size global-id
924-1 pub EPMA JEOL JXA-8900R (Okayama University of Science) 3 20180605101652-291279
924-1 pub Micromass VG5400 6 20180605120106-797242
924-1 pub XRF PANalytical PW2400 12 20160112193840-316681
924-1 pub Q-ICPMS Agilent 7500cs 29 20160112193940-416168
729-1 pub EPMA JEOL JXA-8900R (Okayama University of Science) 3 20180613092928-352460
727-1 pub EPMA JEOL JXA-8900R (Okayama University of Science) 4 20180605101651-924574
727-1 pub XRF PANalytical PW2400 12 20160112193820-670217
925-2 pub EPMA JEOL JXA-8900R (Okayama University of Science) 4 20180605101651-888846
925-2 pub XRF PANalytical PW2400 12 20160112193836-556296
728-3 pub EPMA JEOL JXA-8900R (Okayama University of Science) 5 20180605101651-658259
728-3 pub XRF PANalytical PW2400 12 20160112193828-601876
728-2c pub EPMA JEOL JXA-8900R (Okayama University of Science) 4 20180605101651-467210
728-2C pub XRF PANalytical PW2400 12 20160112193824-164997
728-5 pub EPMA JEOL JXA-8900R (Okayama University of Science) 4 20180605101651-029022
728-5 pub XRF PANalytical PW2400 12 20160112193832-984025
090924-1 pub XRF PANalytical PW2400 11 20130425112124-986491
090727-1 pub XRF PANalytical PW2400 11 20130425112123-903980
090728-2c pub XRF PANalytical PW2400 11 20130425112123-392392
090728-3 pub XRF PANalytical PW2400 11 20130425112123-069057
090728-5 pub XRF PANalytical PW2400 11 20130425112123-620455
090925-2 pub XRF PANalytical PW2400 11 20130425112124-321802
727-1 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-888419
727-1 pub Micromass VG5400 7 20180605120105-931015
727-1 pub Q-ICPMS Agilent 7500cs 29 20160112193911-068132
728-2c pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-414263
728-2c pub Micromass VG5400 7 20180605120105-471759
728-2C pub Q-ICPMS Agilent 7500cs 29 20160112193917-587230
728-3 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-495770
728-3 pub Micromass VG5400 7 20180605120105-664992
728-3 pub Q-ICPMS Agilent 7500cs 29 20160112193923-232290
728-5 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-524587
728-5 pub Micromass VG5400 7 20180605120106-209627
728-5 pub Q-ICPMS Agilent 7500cs 29 20160112193929-580256
925-2 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-993047
925-2 pub Micromass VG5400 7 20180605120106-332995
925-2 pub Q-ICPMS Agilent 7500cs 29 20160112193934-036737
924-1 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-452086
729-1 pub Hitachi Type 180-30 Atomic Absorption/Flame Spectrometer (Okayama University of Science) 1 20180608095109-353281
729-1 pub Micromass VG5400 6 20180613092132-735544
name spots global-id
caption ID assembly stone
Table 2. Whole rock compositions of Bratan lavas pub 20160112194655-215451 major-trace (Ryu et al., 2013) 6
Table 3: K-Ar analytical data of Bratan lavas pub 20160105090150-361369 K-Ar dating (Ryu et al., 2013) 7
Table 1: Summary of petrographic charcteristics of Bratan lavas pub 20180531091915-103545 mode (Ryu et al., 2013) 7
manual
  • name
  • Ryu, S.
  • Kitagawa, Hiroshi
  • Nakamura, E.
  • Itaya, T.
  • Watanabe, K.