Sr isotope chemostratigraphy and pb–pb age of the riphean carbonate deposits of the kharaulakh uplift (Northeastern margin of the siberian platform)

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Sr isotope chemostratigraphy and pb–pb age of the riphean carbonate deposits of the kharaulakh uplift (Northeastern margin of the siberian platform). / Kochnev, B. B.; Kuznetsov, A. B.; Sitkina, D. R. et al.

In: Russian Geology and Geophysics, Vol. 62, No. 3, 03.2021, p. 377-387.

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

BibTeX

@article{47ef124774b24345bb4ced18c5106b08,

title = "Sr isotope chemostratigraphy and pb–pb age of the riphean carbonate deposits of the kharaulakh uplift (Northeastern margin of the siberian platform)",

abstract = "––The least altered limestones of the Ukta and Eselekh formations in the Precambrian section of the Kharaulakh uplift have a minimum87Sr/86Sr ratio of 0.70673–0.70715. The lowest87Sr/86Sr ratio of the overlying Neleger and Sietachan formations is 0.70791– 0.70817. Based on these data, along with the earlier obtained positive δ13С values (up to 8‰) for the Kharaulakh section, we have estimated the age of the Ukta and Eselekh formations at 800–670 Ma and the age of the Neleger and Sietachan formations at ~640–580 Ma. The Pb–Pb isochron age of the least altered limestones of the Eselekh Formation calculated from eight samples is 720 ± 30 Ma. This age permits us to define the lower part of the Kharaulakh section of the Ukta and Eselekh formations to be the late Tonian of the International Chro-nostratigraphic Chart or to the Upper Riphean of the General Stratigraphic Scale of Russia. The presence of reliably dated Upper Riphean sediments in the Kharaulakh uplift indicates a more complex structure of the Precambrian sedimentary cover on the Arctic margin of the Siberian Platform than assumed earlier.",

keywords = "Carbon isotopes, Isotope chemostratigraphy, Kharaulakh uplift, Neoproterozoic, Pb–Pb geochronology, Sedimentary carbonates, Siberian Plat-form, Strontium isotopes",

author = "Kochnev, {B. B.} and Kuznetsov, {A. B.} and Sitkina, {D. R.} and Kramchaninov, {A. Yu}",

note = "Funding Information: This work was supported by grants 17-05-00418 and 18-05-70110 from the Russian Foundation for Basic Research and by project 18-17-00247 from the Russian Science Foundation. Publisher Copyright: {\textcopyright} 2021, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2021",

month = mar,

doi = "10.2113/RGG20194076",

language = "English",

volume = "62",

pages = "377--387",

journal = "Russian Geology and Geophysics",

issn = "1068-7971",

publisher = "Elsevier Science B.V.",

number = "3",

}

RIS

TY - JOUR

T1 - Sr isotope chemostratigraphy and pb–pb age of the riphean carbonate deposits of the kharaulakh uplift (Northeastern margin of the siberian platform)

AU - Kochnev, B. B.

AU - Kuznetsov, A. B.

AU - Sitkina, D. R.

AU - Kramchaninov, A. Yu

N1 - Funding Information: This work was supported by grants 17-05-00418 and 18-05-70110 from the Russian Foundation for Basic Research and by project 18-17-00247 from the Russian Science Foundation. Publisher Copyright: © 2021, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - ––The least altered limestones of the Ukta and Eselekh formations in the Precambrian section of the Kharaulakh uplift have a minimum87Sr/86Sr ratio of 0.70673–0.70715. The lowest87Sr/86Sr ratio of the overlying Neleger and Sietachan formations is 0.70791– 0.70817. Based on these data, along with the earlier obtained positive δ13С values (up to 8‰) for the Kharaulakh section, we have estimated the age of the Ukta and Eselekh formations at 800–670 Ma and the age of the Neleger and Sietachan formations at ~640–580 Ma. The Pb–Pb isochron age of the least altered limestones of the Eselekh Formation calculated from eight samples is 720 ± 30 Ma. This age permits us to define the lower part of the Kharaulakh section of the Ukta and Eselekh formations to be the late Tonian of the International Chro-nostratigraphic Chart or to the Upper Riphean of the General Stratigraphic Scale of Russia. The presence of reliably dated Upper Riphean sediments in the Kharaulakh uplift indicates a more complex structure of the Precambrian sedimentary cover on the Arctic margin of the Siberian Platform than assumed earlier.

AB - ––The least altered limestones of the Ukta and Eselekh formations in the Precambrian section of the Kharaulakh uplift have a minimum87Sr/86Sr ratio of 0.70673–0.70715. The lowest87Sr/86Sr ratio of the overlying Neleger and Sietachan formations is 0.70791– 0.70817. Based on these data, along with the earlier obtained positive δ13С values (up to 8‰) for the Kharaulakh section, we have estimated the age of the Ukta and Eselekh formations at 800–670 Ma and the age of the Neleger and Sietachan formations at ~640–580 Ma. The Pb–Pb isochron age of the least altered limestones of the Eselekh Formation calculated from eight samples is 720 ± 30 Ma. This age permits us to define the lower part of the Kharaulakh section of the Ukta and Eselekh formations to be the late Tonian of the International Chro-nostratigraphic Chart or to the Upper Riphean of the General Stratigraphic Scale of Russia. The presence of reliably dated Upper Riphean sediments in the Kharaulakh uplift indicates a more complex structure of the Precambrian sedimentary cover on the Arctic margin of the Siberian Platform than assumed earlier.

KW - Carbon isotopes

KW - Isotope chemostratigraphy

KW - Kharaulakh uplift

KW - Neoproterozoic

KW - Pb–Pb geochronology

KW - Sedimentary carbonates

KW - Siberian Plat-form

KW - Strontium isotopes

UR - http://www.scopus.com/inward/record.url?scp=85104968610&partnerID=8YFLogxK

U2 - 10.2113/RGG20194076

DO - 10.2113/RGG20194076

M3 - Article

AN - SCOPUS:85104968610

VL - 62

SP - 377

EP - 387

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 3

ER -

ID: 28466277