Petrogenesis of the despen volcanic rocks of the middle–late ordovician volcanoplutonic association of the tannu-ola terrane (Southwestern Tuva)

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Petrogenesis of the despen volcanic rocks of the middle–late ordovician volcanoplutonic association of the tannu-ola terrane (Southwestern Tuva). / Vetrov, E. V.; Uvarov, A. N.; Vetrova, N. I. et al.

In: Russian Geology and Geophysics, Vol. 62, No. 6, 06.2021, p. 633-647.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{19090e51efee4ce091e7fef5fb5f0a10,

title = "Petrogenesis of the despen volcanic rocks of the middle–late ordovician volcanoplutonic association of the tannu-ola terrane (Southwestern Tuva)",

abstract = "We have studied the structure and composition of a volcanic unit in the valley of the Despen River, on the southern slope of the East Tannu-Ola Ridge. The unit was earlier assigned to the Lower Devonian Kendei Formation. The new geological and geochronologi-cal data show that it resulted from explosive volcanism at 460–450 Ma. The Despen volcanic rocks formed in association with granitoids of the Argolik complex at the end of the accretion–collision stage of evolution of the Altai–Sayan region, in particular, the Tannu-Ola terrane. These are predominantly felsic ferroan metaluminous and weakly peraluminous nappe volcanic rocks resulted from the differentiation of tholeiitic basalts. Their REE patterns, like those of the Argolik granitoids, are flat in the HREE, show a distinct Eu anomaly, and suggest magma generation at shallow depths in the upper crust. The magmatic source was of subduction origin, as evidenced by the negative Ta–Nb anomalies in the multielement patterns and by εNd(T) = +3.1 to +5.6, and has a Neoproterozoic model age, TNd(DM-2st) = 0.94–0.69 Ga.",

keywords = "Ordovician, Petrogeochemical and isotope-geochemical (Sm–Nd) studies, Republic of Tuva, Volcanism, Zircon U–Pb (SHRIMP-II) dating",

author = "Vetrov, {E. V.} and Uvarov, {A. N.} and Vetrova, {N. I.} and Letnikov, {F. A.} and Vishnevskaya, {I. A.} and Zhimulev, {F. I.} and Andreeva, {E. S.} and Chervyakovskaya, {M. V.}",

note = "Funding Information: The work is done on state assignment of IGM SB RAS with a financial support by grants 19-05-00145, 18-35-20025, and 17-05-00819 from the Russian Foundation for Basic Research. Publisher Copyright: {\textcopyright} 2021, Novosibirsk State University.",

year = "2021",

month = jun,

doi = "10.2113/RGG20194167",

language = "English",

volume = "62",

pages = "633--647",

journal = "Russian Geology and Geophysics",

issn = "1068-7971",

publisher = "Elsevier Science B.V.",

number = "6",

}

RIS

TY - JOUR

T1 - Petrogenesis of the despen volcanic rocks of the middle–late ordovician volcanoplutonic association of the tannu-ola terrane (Southwestern Tuva)

AU - Vetrov, E. V.

AU - Uvarov, A. N.

AU - Vetrova, N. I.

AU - Letnikov, F. A.

AU - Vishnevskaya, I. A.

AU - Zhimulev, F. I.

AU - Andreeva, E. S.

AU - Chervyakovskaya, M. V.

N1 - Funding Information: The work is done on state assignment of IGM SB RAS with a financial support by grants 19-05-00145, 18-35-20025, and 17-05-00819 from the Russian Foundation for Basic Research. Publisher Copyright: © 2021, Novosibirsk State University.

PY - 2021/6

Y1 - 2021/6

N2 - We have studied the structure and composition of a volcanic unit in the valley of the Despen River, on the southern slope of the East Tannu-Ola Ridge. The unit was earlier assigned to the Lower Devonian Kendei Formation. The new geological and geochronologi-cal data show that it resulted from explosive volcanism at 460–450 Ma. The Despen volcanic rocks formed in association with granitoids of the Argolik complex at the end of the accretion–collision stage of evolution of the Altai–Sayan region, in particular, the Tannu-Ola terrane. These are predominantly felsic ferroan metaluminous and weakly peraluminous nappe volcanic rocks resulted from the differentiation of tholeiitic basalts. Their REE patterns, like those of the Argolik granitoids, are flat in the HREE, show a distinct Eu anomaly, and suggest magma generation at shallow depths in the upper crust. The magmatic source was of subduction origin, as evidenced by the negative Ta–Nb anomalies in the multielement patterns and by εNd(T) = +3.1 to +5.6, and has a Neoproterozoic model age, TNd(DM-2st) = 0.94–0.69 Ga.

AB - We have studied the structure and composition of a volcanic unit in the valley of the Despen River, on the southern slope of the East Tannu-Ola Ridge. The unit was earlier assigned to the Lower Devonian Kendei Formation. The new geological and geochronologi-cal data show that it resulted from explosive volcanism at 460–450 Ma. The Despen volcanic rocks formed in association with granitoids of the Argolik complex at the end of the accretion–collision stage of evolution of the Altai–Sayan region, in particular, the Tannu-Ola terrane. These are predominantly felsic ferroan metaluminous and weakly peraluminous nappe volcanic rocks resulted from the differentiation of tholeiitic basalts. Their REE patterns, like those of the Argolik granitoids, are flat in the HREE, show a distinct Eu anomaly, and suggest magma generation at shallow depths in the upper crust. The magmatic source was of subduction origin, as evidenced by the negative Ta–Nb anomalies in the multielement patterns and by εNd(T) = +3.1 to +5.6, and has a Neoproterozoic model age, TNd(DM-2st) = 0.94–0.69 Ga.

KW - Ordovician

KW - Petrogeochemical and isotope-geochemical (Sm–Nd) studies

KW - Republic of Tuva

KW - Volcanism

KW - Zircon U–Pb (SHRIMP-II) dating

UR - http://www.scopus.com/inward/record.url?scp=85108691972&partnerID=8YFLogxK

U2 - 10.2113/RGG20194167

DO - 10.2113/RGG20194167

M3 - Article

AN - SCOPUS:85108691972

VL - 62

SP - 633

EP - 647

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 6

ER -

ID: 34032585