Kuritani, T. & Nakamura, E. (2006) Elemental fractionation in lavas during post-eruptive degassing: Evidence from trachytic lavas, Rishiri Volcano, Japan, Journal of Volcanology and Geothermal Research, 149, 124-138, doi: 10.1016/j.jvolgeores.2005.06.008. < 20100403101826305.admin > pub

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

  • abstract:

    Trachytic lavas of Rishiri Volcano, northern Japan, show a peculiar geochemical variation across lava flow units. Samples collected systematically in a vertical cross section from a lava flow unit with a thickness of about 20 m are nearly homogeneous in major element compositions. However, some trace elements, including Li, B and Cs, are considerably depleted in samples collected from the main part of the flow unit, compared to those obtained from the surface of the lava flow (clinker layer). In particular, Cs content of the main flow unit is as low as ∼30% of the clinker layer. 11B /10B ratios of samples from the main flow unit are also slightly lower than those of the clinker samples, and the isotope compositions positively correlate with boron concentrations. These geochemical variations cannot be explained by magmatic processes in magma chambers, post-eruptive weathering, or alteration process. Rather, we infer these systematics resulted from escape of these elements from the lava flow unit during post-eruptive degassing. Vapor phases in which Li, B and Cs dissolved are suggested to have been transported through veins formed in the main flow unit as fractures due to slight shearing along the flow planes after lava emplacement. In the Tanetomi lava, only rocks of the clinker layer preserve original composition of magmas, although they are porous and brownish due to extensive oxidization. On the other hand, rocks of the main flow unit do not retain original magma compositions, although they are dense and grayish, and seem to be much fresher compared to the clinkers. A similar geochemical modification of lavas can occur in other volcanic systems, especially for lavas consisting of relatively thick flow units.

  • doi: 10.1016/j.jvolgeores.2005.06.008
  • modified at 2019-07-18
ISEI/main/126/A/6/Rishiri Kuritani < 20120517092829-459-154 >
20120517094125-685-513 Img 6155@18a88acaed21f6321e89d88 thumb Ta-28 < 20120517094125-685-513 >pub
  • IGSN: IEDRM00HU
  • classification: igneous
  • physical-form: hand specimen
  • quantity (kg): 1.82
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava LL2, top clinker layer) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
20120517094057-036-706 Img 6152@4b53430c1c9fc7bc6d1b6c0 thumb Ta-29 < 20120517094057-036-706 >pub
  • IGSN: IEDRM00C6
  • classification: igneous
  • physical-form: hand specimen
  • status: (unknown)
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava LL2, top clinker layer) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
20120517094106-630-380 Img 6153@a8e9b2d66f7e0600e64aef5 thumb Ta-32 < 20120517094106-630-380 >pub
  • IGSN: IEDRM00HT
  • classification: igneous
  • physical-form: grain
  • status: (unknown)
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava LL2, top clinker layer) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
20120517094116-737-209 Img 6154@8254c0f2272a5f5a2f7234f thumb Ta-2 < 20120517094116-737-209 >pub
  • IGSN: IEDRM00HV
  • classification: igneous
  • physical-form: hand specimen
  • status: (unknown)
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava LL2, Main flow unit) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
20120517094200-497-786 Img 6159@549e4ce371acf51ae262614 thumb Ta-14 < 20120517094200-497-786 >pub
  • IGSN: IEDRM007W
  • classification: igneous
  • physical-form: thick section
  • status: (unknown)
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava (LL2)) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
20120517094048-505-404 Img 6151@147ebe3c7d5a5a6851fffbf thumb Ta-33 < 20120517094048-505-404 >pub
  • IGSN: IEDRM00HS
  • classification: igneous
  • physical-form: hand specimen
  • quantity (kg): 1.82
  • description: This rock is collected by T. Kuritani from Tanetomi lava (Lower lava LL2, top clinker layer) in Rishiri Island, Northern Japan. Geochemical analysis were undertaken by T. Kuritani (Kuritani and Nakamura, 2006: JVGR149, p124-138), except for halogen abundances (by Qiaoyun Wang, PhD study in 2010). The sample was provided by A. Makishima to H. Kitagawa on May 18 in 2012.
  • modified at 2019-07-18
ISEI/main/127/D/6/Kuritani 21 < 20091014092136165.hkitagawa >
20151130084051-902273 Tixhr 1154615126 thumb Ta-17 < 20151130084051-902273 >pub
  • IGSN: IEDRM00HW
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 124.8
  • description: Tanetomi lava, Lower Lava 2 (LL2) at the Rishiri Quarry, Bottom clinker layer
  • modified at 2019-07-18
20151130083939-582552 Tixhr501095214 thumb Ta-11 < 20151130083939-582552 >pub
  • IGSN: IEDRM00HX
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 68.06
  • description: Tanetomi lava, Lower Lava 2 (LL2) at the Rishiri Quarry, Main flow unit
  • modified at 2019-07-18
20151130083840-917468 Tixhr1389989031 thumb Ta-5 < 20151130083840-917468 >pub
  • IGSN: IEDRM00HY
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 163.36
  • description: Tanetomi lava, Lower Lava 2 (LL2) at the Rishiri Quarry, Main flow unit
  • modified at 2019-07-18
20151130083641-342975 Tixhr 733396400 thumb Ta-1 < 20151130083641-342975 >pub
  • IGSN: IEDRM00HZ
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 53.1
  • description: Tanetomi lava, Lower Lava 2 (LL2) at the Rishiri Quarry, Main flow unit
  • modified at 2019-07-18
name box-type global-id
binder of Elemental fractionation in lavas during post-eruptive degassing: Evidence from trachytic lavas, Rishiri Volcano, Japan pub container 20160212140726-313069
name latitude longitude global-id
name device size global-id
Ta-28_2006 pub 2 20190620142443-349286
Ta-28_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-432251
Ta-28_2006 pub XRF PANalytical PW2400 15 20190620142430-996144
Ta-28_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143546-070143
Ta-28_2006 pub ICPMS Yokogawa PMS2000 28 20190620144432-716784
Ta-28_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-447659
Ta-29 pub TIMS Thermo-Fisher MAT261 1 20190619150147-206414
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Ta-29 pub XRF PANalytical PW2400 13 20190619143325-170385
Ta-29 pub ICPMS Yokogawa PMS2000 27 20190619150131-710202
Ta-29 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153604-293703
Ta-29 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153615-111664
Ta-29 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190619153626-709571
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Ta-29_2006 pub XRF PANalytical PW2400 13 20190620142430-702260
Ta-29_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-931008
Ta-29_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143546-427799
Ta-29_2006 pub ICPMS Yokogawa PMS2000 28 20190620144432-074128
Ta-32_2006 pub 2 20190620142443-972030
Ta-32_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-256462
Ta-32_2006 pub XRF PANalytical PW2400 13 20190620142430-752559
Ta-32_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143546-959188
Ta-32_2006 pub ICPMS Yokogawa PMS2000 28 20190620144433-558377
Ta-2_2006 pub 2 20190620142443-951241
Ta-2_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-063186
Ta-2_2006 pub XRF PANalytical PW2400 13 20190620142428-403283
Ta-2_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-977981
Ta-2_2006 pub ICPMS Yokogawa PMS2000 28 20190620144429-851347
Ta-14 pub XRF Philips PW-1480 (Tokyo) 21 20190614154426-145434
Ta-14 pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 2 20190614155144-577997
Ta-14_2006 pub 2 20190620142443-642760
Ta-14_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-288079
Ta-14_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-475487
Ta-14_2006 pub XRF PANalytical PW2400 13 20190620142429-264311
Ta-14_2006 pub ICPMS Yokogawa PMS2000 28 20190620144431-783844
Ta-33_2006 pub 2 20190620142443-064692
Ta-33_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-345059
Ta-33_2006 pub XRF PANalytical PW2400 13 20190620142431-413005
Ta-33_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143546-204892
Ta-33_2006 pub ICPMS Yokogawa PMS2000 28 20190620144433-399225
Ta-17_2006 pub XRF PANalytical PW2400 13 20190620142429-960694
Ta-17_2006 pub 2 20190620142443-608394
Ta-17_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-168515
Ta-17_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-598170
Ta-17_2006 pub ICPMS Yokogawa PMS2000 28 20190620144431-262682
Ta-11_2006 pub 2 20190620142443-722702
Ta-11_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-197317
Ta-11_2006 pub XRF PANalytical PW2400 13 20190620142429-979626
Ta-11_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-856094
Ta-11_2006 pub ICPMS Yokogawa PMS2000 28 20190620144430-920059
Ta-5_2006 pub 2 20190620142443-366887
Ta-5_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-219808
Ta-5_2006 pub XRF PANalytical PW2400 13 20190620142429-159232
Ta-5_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-179791
Ta-5_2006 pub ICPMS Yokogawa PMS2000 28 20190620144429-460616
Ta-1_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190620143558-773780
Ta-1_2006 pub XRF PANalytical PW2400 13 20190620142428-761459
Ta-1_2006 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190620143545-721356
Ta-1_2006 pub 2 20190620142443-921614
Ta-1_2006 pub ICPMS Yokogawa PMS2000 28 20190620144428-196132
Ta-1U-Th_8 pub TIMS Thermo-Fisher MAT261 5 20190621100740-979928
Ta-1U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100739-521479
Ta-1U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100739-236328
Ta-1U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100739-620319
Ta-1U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100740-822226
Ta-1U-Th_5 pub TIMS Thermo-Fisher MAT261 5 20190621100740-388086
Ta-1U-Th_6 pub TIMS Thermo-Fisher MAT261 5 20190621100740-119055
Ta-1U-Th_7 pub TIMS Thermo-Fisher MAT261 5 20190621100740-394330
Ta-2U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100740-104264
Ta-2U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100740-307135
Ta-2U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100740-019344
Ta-11U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100740-149592
Ta-11U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100741-812118
Ta-11U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100741-661103
Ta-17U-Th_5 pub TIMS Thermo-Fisher MAT261 5 20190621100741-921945
Ta-17U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100741-572115
Ta-17U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100741-963508
Ta-17U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100741-639706
Ta-17U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100741-881395
Ta-28U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100741-116336
Ta-28U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100742-770941
Ta-28U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100742-524734
Ta-28U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100742-886135
Ta-28U-Th_5 pub TIMS Thermo-Fisher MAT261 5 20190621100742-983261
Ta-28U-Th_6 pub TIMS Thermo-Fisher MAT261 5 20190621100742-738979
name spots global-id
caption assembly stone
Table 1. Whole-rock compositions of the representative samples pub major-trace-isotope (Kuritani, 2006) 10
manual
  • name
  • Kuritani, T.
  • Nakamura, E.