Kuritani, T. et al. (2007) Rates of Thermal and Chemical Evolution of Magmas in a Cooling Magma Chamber: a Chronological and Theoretical Study on Basaltic and Andesitic Lavas from Rishiri Volcano, Japan, J. Petrol., 48, 1295-1319, doi: 10.1093/petrology/egm018. < 20100403101828129.admin > pub

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

  • abstract:

    Rates of magmatic processes in a cooling magma chamber were investigated for alkali basalt and trachytic andesite lavas erupted sequentially from Rishiri Volcano, northern Japan, by dating of these lavas using 238U–230Th radioactive disequilibrium and 14C dating methods, in combination with theoretical analyses. We obtained the eruption age of the basaltic lavas to be 29.3 ± 0.6 ka by 14C dating of charcoals. The eruption age of the andesitic lavas was estimated to be 20.2 ± 3.1 ka, utilizing a whole-rock isochron formed by U–Th fractionation as a result of degassing after lava emplacement. Because these two lavas represent a series of magmas produced by assimilation and fractional crystallization in the same magma chamber, the difference of the ages (i.e. ∼9 kyr) is a timescale of magmatic evolution. The thermal and chemical evolution of the Rishiri magma chamber was modeled using mass and energy balance constraints, as well as quantitative information obtained from petrological and geochemical observations on the lavas. Using the timescale of ∼9 kyr, the thickness of the magma chamber is estimated to have been about 1.7 km. The model calculations show that, in the early stage of the evolution, the magma cooled at a relatively high rate (>0.1°C/year), and the cooling rate decreased with time. Convective heat flux from the main magma body exceeded 2 W/m2 when the magma was basaltic, and the intensity diminished exponentially with magmatic evolution. Volume flux of crustal materials to the magma chamber and rate of convective melt exchange (compositional convection) between the main magma and mush melt also decreased with time, from ∼ 0.1 m/year to ∼ 10−3 m/year, and from ∼ 1 m/year to ∼ 10−2 m/year, respectively, as the magmas evolved from basaltic to andesitic compositions. Although the mechanism of the cooling (i.e. thermal convection and/or compositional convection) of the main magma could not be constrained uniquely by the model, it is suggested that compositional convection was not effective in cooling the main magma, and the magma chamber is considered to have been cooled by thermal convection, in addition to heat conduction.

  • doi: 10.1093/petrology/egm018
  • modified at 2019-07-18
ISEI/main/127/D/6/Kuritani 21 < 20091014092136165.hkitagawa >
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
20151130084230-279167 Tixhr257428535 thumb Ta-25 < 20151130084230-279167 >pub
  • IGSN: IEDRM00O8
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 807.35
  • description: Kutsugata Lava, North Lava, basaltic andesite
  • modified at 2019-07-18
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
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
20151130084326-011734 Tixhr 88811309 thumb Ta-31 < 20151130084326-011734 >pub
  • IGSN: IEDRM00O9
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 1363.16
  • description: Kutsugata Lava, North Lava, basaltic andesite
  • modified at 2019-07-18
ISEI/main/127/D/5/Kuritani 27 < 20091014092125951.hkitagawa >
20151113080017-796937 Tixhr572971475 thumb KR 9 < 20151113080017-796937 >pub
  • IGSN: IEDRM0089
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (g): 673.57
  • description: Kutsugata Lava, South Lava 2 (augite phenocryst-rich lava)
  • modified at 2019-07-18
ISEI/main/127/Kuritani 28 < 20091014092124228.hkitagawa >
20151117090523-590854 Tixhr221668133 thumb Kr 28 < 20151117090523-590854 >pub
  • IGSN: IEDRM00CA
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 748.34
  • description: Kutsugata Lava, South Lava
  • modified at 2019-07-18
20151117090929-691480 Tixhr 209787684 thumb Kr 47 < 20151117090929-691480 >pub
  • IGSN: IEDRM00CB
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 84.31
  • description: Rishiri, Tanetomi lava, Upper lava (UL2)
  • modified at 2019-07-18
20151116085744-915516 Tixhr379004886 thumb Kr 41 < 20151116085744-915516 >pub
  • IGSN: IEDRM00OA
  • classification: volcanic
  • physical-form: hand specimen
  • quantity (g): 267.9
  • description: Kutsugata Lava, South Lava
  • modified at 2019-07-18
20151116085607-104933 Tixhr1650341373 thumb Kr 74 < 20151116085607-104933 >pub
  • IGSN: IEDRM007Y
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 175.99
  • description: Rishiri, Tanetomi lava, Lower lava (LL1)
  • modified at 2019-07-18
20151116085911-562570 Tixhr 1406852609 thumb Kr 72 < 20151116085911-562570 >pub
  • IGSN: IEDRM007Z
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (g): 448.49
  • description: Rishiri, Tanetomi lava, Upper lava (UL1)
  • 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
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
name latitude longitude global-id
name device size global-id
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
Kr 9 pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 4 20190613154312-964179
Kr 9 pub XRF Philips PW-1480 (Tokyo) 21 20190613153951-591714
Kr 9_1 pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 4 20190617155517-853594
KR 9_2007 pub XRF PANalytical PW2400 14 20190620160218-111495
KR 9 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190621092709-819087
KR 9_2007 pub ICPMS Yokogawa PMS2000 25 20190621091433-894404
KR 9_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-192010
Ta-25_2007 pub XRF PANalytical PW2400 14 20190620160217-740035
Ta-25_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-252261
Ta-25 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190621092709-233128
Ta-25_2007 pub ICPMS Yokogawa PMS2000 25 20190621091432-412385
Kr 28 pub TIMS Thermo-Fisher MAT261 1 20190619150147-072445
Kr 28 pub 2 20190619143339-016714
Kr 28 pub ICPMS Yokogawa PMS2000 27 20190619150130-211536
Kr 28 pub XRF PANalytical PW2400 15 20190619143325-306295
Kr 28 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153604-194379
Kr 28 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153615-341631
Kr 28 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190619153625-315623
Kr 28_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-986867
Kr 47 pub 2 20190619143340-541710
Kr 47 pub XRF PANalytical PW2400 15 20190619143326-514665
Kr 47 pub TIMS Thermo-Fisher MAT261 1 20190619150147-113433
Kr 47 pub ICPMS Yokogawa PMS2000 27 20190619150134-053634
Kr 47 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153604-264440
Kr 47 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153616-184778
Kr 47 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190619153626-477654
Kr 47_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-981677
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-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-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-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
Kr 41_2007 pub XRF PANalytical PW2400 14 20190620160218-268416
Kr 41_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-160881
Kr 41 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190621092709-362430
Kr 41_2007 pub ICPMS Yokogawa PMS2000 25 20190621091433-620345
Ta-31_2007 pub XRF PANalytical PW2400 14 20190620160217-663966
Ta-31_2007 pub ICPMS Yokogawa PMS2000 25 20190621091432-239593
Ta-31 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190621092709-410857
Ta-31_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-614243
Kr 74 pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 3 20190614155144-289652
Kr 74 pub XRF Philips PW-1480 (Tokyo) 21 20190614154427-356064
Kr 74 pub TIMS Thermo-Fisher MAT261 1 20190619150147-790165
Kr 74 pub 2 20190619143340-591132
Kr 74 pub XRF PANalytical PW2400 15 20190619143326-812758
Kr 74 pub ICPMS Yokogawa PMS2000 27 20190619150132-098020
Kr 74 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153604-356756
Kr 74 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153616-801475
Kr 74 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190619153626-215572
Kr 74_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-943474
Kr 72 pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 4 20190614155144-007573
Kr 72 pub XRF Philips PW-1480 (Tokyo) 21 20190614154428-498432
Kr 72 pub TIMS Thermo-Fisher MAT261 1 20190619150147-921789
Kr 72 pub 2 20190619143340-917306
Kr 72 pub XRF PANalytical PW2400 15 20190619143326-864510
Kr 72 pub ICPMS Yokogawa PMS2000 27 20190619150132-078075
Kr 72 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153604-931317
Kr 72 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190619153616-387440
Kr 72 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190619153626-799007
Kr 72_2007 pub TIMS Thermo-Fisher MAT261 1 20190621092556-706143
Kr 28U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100738-721142
Kr-9U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100738-921659
Kr 74U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100739-704719
Kr 74U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100739-679596
Kr 72U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100739-966465
Ta-1U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100740-822226
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-28U-Th_6 pub TIMS Thermo-Fisher MAT261 5 20190621100742-738979
Ta-28U-Th_5 pub TIMS Thermo-Fisher MAT261 5 20190621100742-983261
Ta-28U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100742-524734
Ta-28U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100742-770941
Ta-17U-Th_5 pub TIMS Thermo-Fisher MAT261 5 20190621100741-921945
Ta-17U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100741-881395
Ta-11U-Th_3 pub TIMS Thermo-Fisher MAT261 5 20190621100741-661103
Ta-11U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100741-812118
Ta-25U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100737-682020
Ta-11U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100740-149592
Ta-1U-Th_6 pub TIMS Thermo-Fisher MAT261 5 20190621100740-119055
Ta-1U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100739-521479
Kr-41U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100738-713368
Ta-25U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100737-248924
Ta-31U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100738-294938
Kr 28U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100738-596477
Kr-41U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100738-580480
Kr-9U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100738-411382
Kr 72U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100739-089289
Kr 47U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100739-442267
Kr 47U-Th_2 pub TIMS Thermo-Fisher MAT261 5 20190621100739-298479
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_5 pub TIMS Thermo-Fisher MAT261 5 20190621100740-388086
Ta-1U-Th_7 pub TIMS Thermo-Fisher MAT261 5 20190621100740-394330
Ta-1U-Th_8 pub TIMS Thermo-Fisher MAT261 5 20190621100740-979928
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-28U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100741-116336
Ta-28U-Th_4 pub TIMS Thermo-Fisher MAT261 5 20190621100742-886135
Ta-31U-Th_1 pub TIMS Thermo-Fisher MAT261 5 20190621100737-525252
KR 9_core pub EPMA JEOL JCMA-733MKII/JXA-8900L (Tokyo) 3 20190702111043-582254
name spots global-id
caption assembly stone
Table 2. U and Th isotopic compositions and concentrations of Rishiri samples pub U-series (Kuritani et al., 2007) 41
Table 1. Whole-rock compositions of representative samples pub major-trace-Pb isotopes (Kuritani et al., 2007) 9
manual
  • name
  • Kuritani, T.
  • Yokoyama, T.
  • Nakamura, E.