Tikhomirov, P. L. et al. (2012) The Cretaceous Okhotsk– Chukotka Volcanic Belt (NE Russia): Geology, geochronology, magma output rates, and implications on the genesis of silicic LIPs, Journal of Volcanology and Geothermal Research, 221-222, 14-32, doi: 10.1016/j.jvolgeores.2011.12.011. < 20200106152948-073422 > pub

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

  • abstract:

    The Cretaceous Okhotsk–Chukotka volcanic belt (OCVB) is a prominent subduction-related magmatic province, having the remarkably high proportion of silicic rocks (ca. 53% of the present-day crop area, and presumably over 70% of the total volcanic volume). Its estimated total extrusive volume ranges between 5.5 × 105 km3 (the most conservative estimate) and over 106 km3. This article presents a brief outline of the geology of OCVB, yet poorly described in international scientific literature, and results of a geochronological study on the northern part of the volcanic belt. On the base of new and published U–Pb and 40Ar/39Ar age determinations, a new chronological model is proposed. Our study indicates that the activity of the volcanic belt was highly discontinuous and comprised at least five main episodes at 106–98 Ma, 94–91 Ma, 89–87 Ma, 85.5–84 Ma, and 82–79 Ma. The new data allow a semi-quantitative estimate of the volcanic output rate for the observed part of the OCVB (area and volume approximately 105 km2 and 2.5 × 105 km3, respectively). The average extrusion rate for the entire lifetime of the volcanic belt ranges between 1.6 and 3.6 × 10−5 km3yr−1 km−1, depending on the assumed average thickness of the volcanic pile; the optimal value is 2.6 × 10−5 km3yr−1 km−1. Despite imprecise, such estimates infer the time-averaged volcanic productivity of the OCVB is similar to that of silicic LIPs and most active recent subduction-related volcanic areas of the Earth. However, the most extensive volcanic flare-ups at 89–87 and 85.5-84 Ma had higher rates of over 9.0 × 10−5 km3yr−1 km−1.

    The main volumetric, temporal and compositional parameters of the OCVB are similar to those of silicic LIPs. This gives ground for discussion about the geodynamic setting of the latters, because the widely accepted definition of a LIP implies a strictly intraplate environment. Considering the genesis of the OCVB and other large provinces of silicic volcanism, we propose that residual thermal energy preserved in the continental crust after a previous major magmatic event may have been one of major reasons for high proportion of felsic rocks in a volcanic pile. In this scenario, underplating of mantle-derived basalts causes fast and extensive melting of still hot continental crust and generation of voluminous silicic magmas.

  • doi: 10.1016/j.jvolgeores.2011.12.011
  • modified at 9 h ago
Tixhr430330200 thumb T05-31 < 20181012115423-063297 >pub
  • IGSN: IEDRM0122
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.03
  • age (Ma): 103 (1)
  • description: NE Russia, Chukotka peninsula; Pucheveyem suite
  • modified at 2020-01-15
Tixhr 2032410896 thumb T05-34 < 20181012115915-360152 >pub
  • IGSN: IEDRM0123
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.09
  • age (Ma): 94 (2)
  • description: NE Russia, Chukotka peninsula; Pucheveyem suite
  • modified at 2020-01-15
Tixhr1616235416 thumb T06-22 < 20181012103502-510148 >pub
  • IGSN: IEDRM0124
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.12
  • age (Ma): 88 (1)
  • description: NE Russia, Chukotka peninsula; Nyrvakinot suite
  • modified at 2020-01-15
Tixhr 2060768146 thumb T05-37 < 20181012150442-311597 >pub
  • IGSN: IEDRM0125
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.05
  • age (Ma): 85 (1)
  • description: NE Russia, Chukotka peninsula; Pykarvaam suite; Upper Cretaceous rhyolite
  • modified at 2020-01-15
Tixhr 729769584 thumb PT04-418 < 20181016111749-771972 >pub
  • IGSN: IEDRM0126
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.015
  • age (Ma): 98 (1)
  • description: NE Russia, Chukotka peninsula; Lower Eropol suite
  • modified at 2020-01-15
Tixhr 1515382016 thumb 2320a < 20181016112411-760772 >pub
  • IGSN: IEDRM0127
  • physical-form: hand specimen
  • quantity (kg): 0.045
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-15
Tixhr17196728 thumb 2582-1/460 < 20181016112956-343753 >pub
  • IGSN: IEDRM0128
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.06
  • age (Ma): 106 (2)
  • description: NE Russia, Chukotka peninsula; Etchikun suite
  • modified at 2020-01-15
Tixhr 1090980607 thumb 2238a/02 < 20181016112544-783902 >pub
  • IGSN: IEDRM0129
  • physical-form: hand specimen
  • quantity (kg): 0.045
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-15
Tixhr 708687087 thumb PT-04-558 < 20181016111630-460647 >pub
  • IGSN: IEDRM012A
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.135
  • age (Ma): 89 (1)
  • description: NE Russia, Chukotka peninsula; Lower Eropol suite
  • modified at 2020-01-15
Tixhr 2086530803 thumb 7155a/89 < 20181016114514-620256 >pub
  • IGSN: IEDRM012B
  • physical-form: hand specimen
  • quantity (kg): 0.02
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-15
Tixhr 274190061 thumb 88-4824 fractions < 20181029121145-092166 >pub
  • classification: volcanic:rhyolitic
  • physical-form: powder
  • quantity (g): 6.6
  • age (Ma): 84 (2)
  • description: NE Russia, Chukotka peninsula; Emuneret suite; fractions: #150-#200 - Heavy, Medium, Light, #150-#200 magnetic
  • modified at 2020-01-07
Tixhr317928966 thumb 2582-1/460 < 20181030115932-858299 >pub
  • physical-form: on mount
  • quantity (g): 2.6
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr1489442279 thumb T05-34 (mount) < 20181030111612-124848 >pub
  • physical-form: on mount
  • quantity (g): 2.0
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr 803464400 thumb T05-31 < 20181030111509-754942 >pub
  • physical-form: on mount
  • quantity (g): 2.6
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr1402046943 thumb PT-04-558 (mount) < 20181030114709-026673 >pub
  • physical-form: on mount
  • quantity (g): 3.4
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr674334583 thumb PT-04-418 (mount) < 20181030114605-798926 >pub
  • physical-form: on mount
  • quantity (g): 3.6
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr601202797 thumb 2238a < 20181030115153-739349 >pub
  • physical-form: on mount
  • quantity (g): 1.4
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr1396440320 thumb 2320a < 20181030115254-350879 >pub
  • physical-form: on mount
  • quantity (g): 2.2
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr 654491745 thumb T05-93-1 (mount) < 20181030112333-097738 >pub
  • physical-form: on mount
  • quantity (g): 2.8
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr2035038712 thumb T05-37 < 20181030111720-534939 >pub
  • physical-form: on mount
  • quantity (g): 3.0
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr953412112 thumb T05-88 < 20181030112224-358443 >pub
  • physical-form: on mount
  • quantity (g): 0.8
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr 529206681 thumb T06-22 < 20181030114257-648505 >pub
  • physical-form: on mount
  • quantity (g): 1.8
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr160446930 thumb T05-66 < 20181030111833-336907 >pub
  • physical-form: on mount
  • quantity (g): 3.0
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr701333653 thumb 7155a < 20181030115723-652335 >pub
  • physical-form: on mount
  • quantity (g): 1.6
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr1057735486 thumb 88-4824 < 20181030115832-734524 >pub
  • physical-form: on mount
  • quantity (g): 3.2
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr1595037877 thumb T05-86-1 < 20181030112057-219675 >pub
  • physical-form: on mount
  • quantity (g): 3.2
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-07
Tixhr 1038851031 thumb T05-86-1 < 20181015114702-596892 >pub
  • IGSN: IEDRM012C
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.06
  • age (Ma): 84 (2)
  • description: NE Russia, Chukotka peninsula; Ergyvaam and Emuneret suite; Upper Cretaceous tuff
  • modified at 2020-01-15
Tixhr79572861 thumb T05-93-1 < 20181016093026-987524 >pub
  • IGSN: IEDRM012D
  • classification: volcanic:andesitic
  • physical-form: hand specimen
  • quantity (kg): 0.01
  • description: NE Russia, Chukotka peninsula
  • modified at 2020-01-15
Tixhr397657575 thumb T05-66 < 20181015111555-166393 >pub
  • IGSN: IEDRM012E
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.125
  • age (Ma): 85 (1)
  • description: NE Russia, Chukotka peninsula; Pykarvaam suite; Upper Cretaceous tuff
  • modified at 2020-01-15
Tixhr 1159018622 thumb T05-88 < 20181016091636-628969 >pub
  • IGSN: IEDRM012F
  • classification: volcanic:rhyolitic
  • physical-form: hand specimen
  • quantity (kg): 0.08
  • age (Ma): 83 (2)
  • description: NE Russia, Chukotka peninsula; Ergyvaam and Emuneret suite
  • modified at 2020-01-15
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name spots global-id
caption ID assembly stone
Table 1-1. SIMS U–Pb isotopic analyses of zircons from volcanic rocks of the northern OCVB pub 20200107143457-782975 U-series (Tikhomirov et al., 2012) 45
Table 1-2. SIMS U–Pb isotopic analyses of zircons from volcanic rocks of the northern OCVB pub 20200115092643-528499 U-series (Tikhomirov et al., 2012) 40
manual
  • name
  • Tikhomirov, P. L.
  • Kalinina, E. A.
  • Moriguti, Takuya
  • Makishima, Akio
  • Kobayashi, Katsura
  • Cherepanova, I.Yu.
  • Nakamura, Eizo