Tikhomirov, P. L. et al. (2008) Late Mesozoic silicic magmatism of the North Chukotka area (NE Russia): Age, magma sources, and geodynamic implications, Lithos, 105, 329-346, doi: 10.1016/j.lithos.2008.05.005. < 20100403102546872.admin > pub

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

  • abstract:

    The Cretaceous Okhotsk-Chukotka volcanic belt (OCVB) is one of the largest subduction-related volcanic provinces of the Earth. It is thought to be related with the subduction of paleo-Pacific plates under the collage of terranes of NE Asia accreted during Jurassic and Early Cretaceous time. The OCVB comprises a remarkably high portion of silicic rocks, up to 80-90% in some segments. Within the Central Chukotka segment of the belt, volcanic sequences reveal a rather uniform 40Ar/39Ar and U-Pb isotopic age of near 89-87 Ma. But the felsic volcanic unit with coeval subsurface intrusives named the 'Berlozhya magmatic assemblage' (BMA) yields much older zircon U-Pb ages (146.0 ± 2.4 for rhyolitic tuff and 145.5 ± 1.8 Ma for related granodiorite). The relationship of the BMA with the active boundary between the Chukotka-Arctic Alaska microcontinent and the Anyui-Angayucham oceanic basin is suggested. BMA rocks seem to be undeformed, and their age puts constraints on the timing of main compressional events in the North Chukotka area. We present analytical data for both BMA and OCVB silicic magmatic rocks, including the first isotopic compositions of Sr, Nd, Pb, and Hf for the 1500 km long northern part of the OCVB. We infer that felsic magmas of both BMA and OCVB were produced by the melting of the continental crust, without a significant direct contribution from mantle sources. However, the crustal protolith could contain some ancient island arc complexes, which affected the chemical and isotopic composition of magmatic derivatives. The BMA exhibits a relatively uniform isotopic composition (87Sr/86Sri = 0.7057 to 0.7070, εNdi = - 0.51 to - 0.12, εHfi = 4.41 to 4.92, 206Pb/204Pbi = 18.50 to 18.57, and 208Pb/204Pbi = 38.23 to 38.31), and its chemical diversity likely results from crystal fractionation. The protolith of OCVB rhyolites has more variable isotopic characteristics (87Sr/86Sri = 0.7032 to 0.7082, εNdi = - 4.06 to - 2.84, εHfi = - 1.56 to 3.77, 206Pb/204Pbi = 8.56 to 18.81, and 208Pb/204Pbi = 38.21 to 38.63), and reveals at least three end-members. Each of them is distinct from the source of the Berlozhya assemblage, thus suggestive of compositional layering of the crust. Nd and Hf model ages of all studied rocks correspond to Neoproterozoic. The estimated Nd model age of the OCVB protolith is slightly older than that for the BMA, but both fall into the Neoproterozoic interval (1000 to 800 Ma).

  • summary:

    1.The silicic volcanic sequences of the North Chukotka area were produced during at least two separate events, Late Jurassic (about 145 Ma) and Late Cretaceous (89–87 Ma), both related to continental (Andean-type) volcanic arcs. The former event was likely caused by the subduction of lithosphere of Anyui–Angayucham ocean under the Chukotka–Arctic Alaska microcontinent, whereas the latter event results from the subduction of paleo-Pacific plates under the collage of terranes accreted to Siberia.
    2. During both volcanic episodes, the main sources of silicic magma were located in the continental crust, probably of Neoproterozoic age. The isotopic composition of OCVB rhyolites implies at least 3 different end-members, all having TNdDM of 1000–900 Ma. The protolith of BMA is quite uniform, and its estimated Nd model age is somewhat younger, nearly 800 Ma.
    3. The likely mechanism of evolution of BMA magma is the crystal fractionation. The considerable variations in ‘incompatible’ trace element contents and their ratios could result from relatively high partition coefficients between minerals and silicic melts, as well as from the fractionation of accessory phases such as zircon, allanite, ilmenite, and monazite.
    4. The absence of apparent tectonic deformation in the Late Jurassic volcanic sequence, and the significant unconformity at its base imply that the main Mesozoic compressional event within the North Chukotka area took place before the beginning of the Cretaceous period.

  • doi: 10.1016/j.lithos.2008.05.005
  • modified at 10 h ago


(a) XRF procedures of Takei (2002) on XRF PANalytical PW2400
(b) Q-ICP-MS_procedures of Makishima and Nakamura (1997, 1999, 2006) on Q-ICPMS Agilent 7500cs
(c) Q-ICP-MS_procedures of Lu et al. (2007) on Q-ICPMS Agilent 7500cs
(d) Pb isotopes_procedures of Kuritani and Nakamura (2002, 2003) on TIMS Finnigan MAT261, MAT262 and Triton TI
(e) Sr isotopes_procedures of Yoshikawa and Nakamura (1993) on TIMS Finnigan MAT261, MAT262 and Triton TI
(f) Nd isotopes_procedures of Nakamura et al. (1991, 2003) on TIMS Finnigan MAT261, MAT262 and Triton TI
(g) Hf isotopes_procedures of Lu et al. (2007) on MC-ICP-MS Finnigan, Neptune
Tixhr460994354 thumb b 02 < 20181017092431-887750 >pub
  • IGSN: IEDRM00GX
  • classification: igneous
  • physical-form: coarse chips
  • quantity (kg): 0.065
  • description: NE Russia, Chukotka peninsula; Berlozhya magmatic assemblage, granodiorite
  • modified at 2019-05-08
Tixhr 350820040 thumb 3882a < 20181016113531-634603 >pub
  • IGSN: IEDRM00GY
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.115
  • description: NE Russia, Chukotka peninsula, Berlozhya magmatic assemblage
  • modified at 2019-05-08
Tixhr 1999426463 thumb Br 04 < 20181017092819-240727 >pub
  • IGSN: IEDRM00GZ
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.13
  • description: NE Russia, Chukotka peninsula; Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr 1587015290 thumb 89-01 < 20181016114019-156575 >pub
  • IGSN: IEDRM00H1
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.19
  • description: NE Russia, Chukotka peninsula, Berlozhya magmatic assemblage, enclave in granodiorites
  • modified at 2019-05-08
Tixhr549342605 thumb b 01 < 20181017092150-444997 >pub
  • IGSN: IEDRM00H3
  • classification: volcanic:rhyolitic
  • physical-form: coarse chips
  • quantity (kg): 0.08
  • description: NE Russia, Chukotka peninsula, Berlozhya magmatic assemblage
  • modified at 2019-05-08
Tixhr 625612242 thumb 3876a < 20181016113418-688536 >pub
  • IGSN: IEDRM00H0
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.145
  • description: NE Russia, Chukotka peninsula, Berlozhya magmatic assemblage
  • modified at 2019-05-08
Tixhr619302642 thumb 7938d >100# < 20181016115038-945391 >pub
  • IGSN: IEDRM00H2
  • classification: igneous
  • physical-form: coarse chips
  • quantity (kg): 0.02
  • description: NE Russia, Chukotka peninsula, Berlozhya magmatic assemblage
  • modified at 2019-05-08
Tixhr336195420 thumb Br 03 < 20181017092648-219363 >pub
  • IGSN: IEDRM00H4
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.345
  • description: NE Russia, Chukotka peninsula; Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr1275376730 thumb 2837 < 20181018103929-693301 >pub
  • IGSN: IEDRM00H6
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.145
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr 32884023 thumb 3671b < 20181018104429-347612 >pub
  • IGSN: IEDRM00H9
  • classification: volcanic:rhyolitic
  • physical-form: coarse chips
  • quantity (kg): 0.08
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr 1175462129 thumb 3665e < 20181018104223-871226 >pub
  • IGSN: IEDRM00H8
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.33
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr 230832097 thumb 5353a < 20181018104534-013298 >pub
  • IGSN: IEDRM00HA
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.135
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr228292891 thumb 2819-8 < 20181018103812-379094 >pub
  • IGSN: IEDRM00H5
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.175
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
Tixhr 1449089656 thumb 3619d < 20181018104101-056019 >pub
  • IGSN: IEDRM00H7
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.12
  • description: NE Russia, Chukotka peninsula, Okhotsk-Chukotka volcanic belt
  • modified at 2019-05-08
name box-type global-id
binder of Late Mesozoic silicic magmatism of the North Chukotka area (NE Russia): Age, magma sources, and geodynamic implications by Tikhomirov et al., 2008 pub container 20181030153029-492557
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name spots global-id
caption ID assembly stone
Table 2. Major, trace element, and isotopic composition of BMA and OCVB samples pub 20181023152257-258457 major-trace-isotope (Tikhomirov et al., 2008) 14
manual
  • name
  • Tikhomirov, P. L.
  • Kalinina, E. A.
  • Kobayashi, Katsura
  • Nakamura, E.