Tanaka et al. (2015) Evaluation of the applicatbility of acid leaching for the 238U-230Th internal isochron method, Chemical Geology, 396, 255-264, doi:10.1016/j.chemgeo.2014.12.025. < 20150910160518-275652 > pub

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

  • abstract:

    The 238U–230Th internal isochron method has great potential for determining eruption ages of young volcanic materials if the separated groundmass phases have a sufficiently wide range of U/Th ratios. We examined the fractionation behavior of U and Th in aged (i.e., > 0.5 Ma) basaltic samples by 6 M hydrochloric acid leaching to evaluate the applicability of acid-leaching treatment for the 238U–230Th internal isochron method. Acid leaching of aged basaltic rocks in 238U–234U–230Th secular equilibrium at the bulk-rock scale results in 230Th–238U and 234U–238U radioactive disequilibria for both leachates and residues. These radioactive disequilibria can be explained by redistribution of 234Th (parent of 234U) and 230Th between acid-soluble and acid-resistant phases due to α-recoil. The number of 230Th atoms redistributed by α-recoil can be calculated by using a mass conservation equation for 234U atoms and by the relative amount of recoiled 230Th and 234Th, the latter proportional to the kinetic energy of the recoiled nuclide. When the fraction of daughter nuclide 234U remaining in either the residue or leachate, after α-recoil redistribution of 238U, is large enough (> 95%), the corrected (230Th/238U) values of leachate and residue show radioactive equilibria. This result demonstrates that preferential fractionation between U and Th does not occur during acid leaching for basaltic samples if there is no selective etching of the α-recoil track. This study implies that acid-leaching can be used in conjunction with the 238U–230Th internal isochron method for dating young volcanic rocks by evaluating the degree of the α-recoil redistribution of 234U.

  • doi: 10.1016/j.chemgeo.2014.12.025
  • modified at 2021-06-05
1: OA6-7 2: TD-1839 3: TH11 5: KOL43 6: KOL48


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Tritration with gravimetry
1: OA6-7 2: OA6-7_leachate 3: OA6-7_residue 4: TD-1839 5: TD-1839_leachate 6: TD-1839_residue 7: TH11 8: TH11_leachate 9: TH11_residue 11: TH15_leachate 12: TH15_residue 13: KOL43 14: KOL43_leachate 15: KOL43_residue 16: KOL48 17: KOL48_leachate 18: KOL48_residue 19: KOL48A 20: KOL48A_leachate 21: KOL48A_residue 22: KOL48B 23: KOL48B_leachate 24: KOL48B_residue 25: KOL48C 26: KOL48C_leachate 27: KOL48C_residue 28: KOL48D 29: KOL48D_leachate 30: KOL48D_residue


(a) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
1: OA6-7 2: OA6-7_leachate 3: OA6-7_residue 4: TD-1839 5: TD-1839_leachate 6: TD-1839_residue 7: TH11 8: TH11_leachate 9: TH11_residue 11: TH15_leachate 12: TH15_residue 13: KOL43 14: KOL43_residue 15: KOL43_leachate 16: KOL48 17: KOL48_leachate 18: KOL48_residue 19: KOL48A 20: KOL48A_leachate 21: KOL48A_residue 22: KOL48B 23: KOL48B_leachate 24: KOL48B_residue 25: KOL48C 26: KOL48C_leachate 27: KOL48C_residue 28: KOL48D 29: KOL48D_leachate 30: KOL48D_residue


(a) U-Series_procedures of Yokoyama et al. (1999, 2001, 2003) on MC-ICP-MS Finnigan, Neptune
Td 1839 thumb TD-1839 < 20090219141827.tesfaye >pub
  • IGSN: IEDRM00QW
  • place: N5°58′6.0″, E37°36′0.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.92
  • age (Ma): 0.57 (0.03)
  • description: Southern Main Ethiopian Rift (SMER); Tosa-Sucha ol-py-plagioclasephyric basalt
  • modified at 2020-03-30
Th11 thumb TH11 < 20090410091251942.hkitagawa >pub
  • IGSN: IEDRM0021
  • classification: igneous
  • physical-form: drill-cored
  • quantity (g): 9.56
  • age (ka): 1100.0 (30.0)
  • description: Tertiary basalt lava provided by M. Kono. Sample locality: TH section in Jökuldalur, eastern Iceland.
  • modified at 2020-03-30
Tixhr 1074095350 thumb KOL43 < 20190517101439-381050 >pub
  • IGSN: IEDRM00I6
  • classification: volcanic:basaltic
  • physical-form: coarse chips
  • quantity (g): 5.16
  • age (Ma): 2.8 (0.0)
  • description: Subaerial Makapuu stage; Maakua Gulch dike
  • modified at 2020-03-30
Tixhr737678829 thumb KOL48 < 20190517101613-925335 >pub
  • IGSN: IEDRM00I7
  • classification: volcanic:basaltic
  • physical-form: coarse chips
  • quantity (g): 34.04
  • age (Ma): 2.8 (0.0)
  • description: Subaerial Makapuu stage; Maakua Gulch dike
  • modified at 2020-03-30
Tixhr68406866 thumb OA6-7 < 20190704142539-277533 >pub
  • place: N21°22′16.0″, W157°47′12.0″ more
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.5
  • age (Ma): 0.6 (0.0)
  • description: Pali region of Oahu Island, Honolulu volcanic series; basanite
  • modified at 2020-03-30
name box-type global-id
binder of Evaluation of the applicatbility of acid leaching for the238U-230Th internal isochron method pub container 20190702102356-738921
name latitude longitude global-id
locality of OA6-7 pub 21.3711 N 157.7867 W 20200330104543-156919
Southern Main Ethiopian Rift pub 5.9683 N 37.6000 E 20090219141826359.tesfaye
name device size global-id
Major and trace element abundance of TD-1839 pub 41 20090312165200728.tesfaye
TD-1839_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719105805-183887
TD-1839 pub Q-ICPMS Agilent 7500cs 21 20190719152413-493253
TD-1839 pub EPMA JEOL JXA 8500 system 3 20191204110910-559024
TH11_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719110702-395331
TH11 pub Q-ICPMS Agilent 7500cs 21 20190719152414-873761
KOL43 pub ICPMS Yokogawa PMS2000/Agilent 7500cs 28 20190521114916-360400
KOL43_Pb2008 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190521160243-297485
KOL43 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190521120004-751540
KOL43 pub TIMS Finnigan MAT261, MAT262 and Triton TI 2 20190521120307-418864
KOL43 pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100451-816741
KOL43_Pb2002 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190521120650-087395
KOL43 pub 1 20190521103319-565352
KOL43 pub TIMS Thermo-Fisher MAT261 2 20190521101550-740878
KOL43_Hf pub MC-ICP-MS Finnigan, Neptune 2 20190521144802-017180
KOL43 pub XRF PANalytical PW2400 15 20190625111411-464749
KOL43 pub 3 20190625111227-747602
KOL43_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719113001-845372
KOL43 pub Q-ICPMS Agilent 7500cs 21 20190719152417-604146
KOL48 pub ICPMS Yokogawa PMS2000/Agilent 7500cs 28 20190521114916-316515
KOL48_Pb2008 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190521160243-903476
KOL48 pub TIMS Finnigan MAT261, MAT262 and Triton TI 1 20190521120004-818915
KOL48_Pb2002 pub TIMS Finnigan MAT261, MAT262 and Triton TI 3 20190521120650-244682
KOL48 pub TIMS Finnigan MAT261, MAT262 and Triton TI 2 20190521120307-069085
KOL48 pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100451-338542
KOL48 pub TIMS Thermo-Fisher MAT261 2 20190521101550-399765
KOL48 pub MC-ICP-MS Finnigan, Neptune 2 20190521144802-505484
KOL48 pub 1 20190521103319-737634
KOL48 pub XRF PANalytical PW2400 15 20190625111411-938773
KOL48 pub 3 20190625111227-821111
KOL48 pub Q-ICPMS Agilent 7500cs 21 20190719152418-935358
OA6-7 pub MC-ICP-MS Finnigan, Neptune 6 20200330143421-169809
OA6-7 pub Q-ICPMS Agilent 7500cs 21 20200330145440-590149
OA6-7 pub XRF PANalytical PW2400 14 20200330142358-391191
TH11 pub XRF PANalytical PW2400 14 20131107085032-642837
TH15 pub XRF PANalytical PW2400 14 20131107085117-089411
TD-1839_H2O pub 2 20190718160327-856229
TH15_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719111331-602498
TD-1839 pub XRF PANalytical PW2400 15 20190718160016-193763
TD-1839_residue_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719110344-341025
KOL43_leached pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100451-131814
KOL48_leached pub ICPMS Yokogawa PMS2000/Agilent 7500cs 1 20190521100451-039043
TD-1839_leachate_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719110217-906425
KOL48_leached pub TIMS Thermo-Fisher MAT261 1 20190521101550-754101
KOL43_leached pub TIMS Thermo-Fisher MAT261 1 20190521101550-664129
TD-1839_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152414-278071
TD-1839_residue pub Q-ICPMS Agilent 7500cs 21 20190719152414-752016
TD-1839 pub TIMS Thermo-Fisher MAT262 2 20191120103225-537667
TD-1839 pub TIMS Thermo-Fisher MAT262 3 20191120103012-263504
TD-1839 pub TIMS Thermo-Fisher Triton 6 20191120102908-962524
TD-1839 pub Q-ICPMS Agilent 7500cs 4 20191119155440-837546
TD-1839 pub Q-ICPMS Agilent 7500cs 23 20191119155157-853098
TD-1839_K pub Shimadzu AA6200 1 20191129140745-369483
TD-1839_Ar1 pub Micromass VG5400 4 20191129140929-573698
TD-1839_Ar2 pub Micromass VG5400 4 20191129141135-921641
TH11_leachate_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719111017-584780
TH11_residue_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719111138-478261
TH11_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152415-366879
TH11_residue pub Q-ICPMS Agilent 7500cs 21 20190719152416-788604
TH15_leachate_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719112502-514221
TH15_residue_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719112710-506943
TH15 pub Q-ICPMS Agilent 7500cs 21 20190719152416-538539
TH15_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152416-958311
TH15_residue pub Q-ICPMS Agilent 7500cs 21 20190719152417-233176
KOL43_residue_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719113335-338701
KOL43_leachate pub MC-ICP-MS Finnigan, Neptune 6 20190719113451-706312
KOL43_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152418-260779
KOL43_residue pub Q-ICPMS Agilent 7500cs 21 20190719152418-640999
KOL48_leachate_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719114710-444449
KOL48_residue_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719114952-936627
KOL48D_leachate pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-152839
KOL48A_leachate pub MC-ICP-MS Finnigan, Neptune 6 20190719121416-472029
KOL48A_residue pub MC-ICP-MS Finnigan, Neptune 6 20190719121416-623151
KOL48D_residue pub MC-ICP-MS Finnigan, Neptune 6 20190719121418-873007
KOL48B pub MC-ICP-MS Finnigan, Neptune 6 20190719121416-094778
KOL48B_leachate pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-776291
KOL48B_residue pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-766939
KOL48_U-Th pub MC-ICP-MS Finnigan, Neptune 6 20190719113727-668901
KOL48C pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-453783
KOL48A pub MC-ICP-MS Finnigan, Neptune 6 20190719121416-180489
KOL48C_leachate pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-509235
KOL48C_residue pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-120015
KOL48D pub MC-ICP-MS Finnigan, Neptune 6 20190719121417-678150
KOL48B_residue pub Q-ICPMS Agilent 7500cs 21 20190719152422-848979
KOL48C_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152423-098365
KOL48D pub Q-ICPMS Agilent 7500cs 21 20190719152424-036943
KOL48D_residue pub Q-ICPMS Agilent 7500cs 21 20190719152425-399774
KOL48A pub Q-ICPMS Agilent 7500cs 21 20190719152420-158857
KOL48B pub Q-ICPMS Agilent 7500cs 21 20190719152421-978597
KOL48C pub Q-ICPMS Agilent 7500cs 21 20190719152423-586130
KOL48_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152419-452620
KOL48D_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152424-713181
KOL48A_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152420-860839
KOL48B_leachate pub Q-ICPMS Agilent 7500cs 21 20190719152422-606467
KOL48C_residue pub Q-ICPMS Agilent 7500cs 21 20190719152423-738954
KOL48_residue pub Q-ICPMS Agilent 7500cs 21 20190719152419-521040
KOL48A_residue pub Q-ICPMS Agilent 7500cs 21 20190719152421-675183
OA6-7_leachate pub MC-ICP-MS Finnigan, Neptune 6 20200330143853-187773
OA6-7_leachate pub Q-ICPMS Agilent 7500cs 21 20200330145441-216620
OA6-7_residue pub MC-ICP-MS Finnigan, Neptune 6 20200330144109-217050
OA6-7_residue pub Q-ICPMS Agilent 7500cs 21 20200330145442-232822
name spots global-id
caption ID rowname stone
Table 2. Major element compositions (including Cr and Ni) of the samples analyzed in this study pub 20190718155529-781730 major (Tanaka et al., 2015) 5
Table 4. Trace element compositions of the unleached and leached samples determined by quadrupole-type ICP-MS pub 20190719152144-748271 trace (Tanaka et al., 2015) 29
Table 3. U-Th data of the samples analyzed in this study pub 20190719105347-292604 U-series (Tanaka et al., 2015) 29
manual
  • name
  • Tanaka, Ryoji
  • Yokoyama, Tetsuya
  • Kitagawa, Hiroshi
  • Tesfaye, D. B.
  • Nakamura, E.