TY - JOUR

T1 - Chemostratigraphy and detrital zircon geochronology of the Neoproterozoic Khorbusuonka Group, Olenek Uplift, Northeastern Siberian platform

AU - Vishnevskaya, Irina A.

AU - Letnikova, Elena F.

AU - Vetrova, Natalia I.

AU - Kochnev, Boris B.

AU - Dril, Sergei I.

N1 - Publisher Copyright: © 2017 International Association for Gondwana Research

PY - 2017/11/1

Y1 - 2017/11/1

N2 - This study provides 87Sr/86Sr, δ13C and δ18O data from the best-preserved limestone and dolomite of the Ediacaran carbonate-dominated Khorbusuonka Group of the Olenek Uplift, NE Siberian Craton, as well as detrital zircon geochronological data from both underlying and overlying sandstones. The Maastakh Formation is characterized by 87Sr/86Sr ratios of ca. 0.70822 and δ13C values between + 4.8 and + 6.0‰. 87Sr/86Sr ratios in limestones of the Khatyspyt Formation are fairly uniform, ranging from 0.70783 to 0.70806. The carbon isotopic composition slowly decreases from bottom (+ 3.7‰) to top (− 0.2‰) of section. The Sr isotopic composition of the Turkut Formation varies from 0.70824 to 0.70914, value of δ13C is about zero: − 0.7…+0.7 ‰. The youngest population of detrital zircons from Maastakh Formation indicates that these rocks were formed not later than 630 Ma. U–Pb detrital zircons data of Kessyusa Group has a single peak at about 543 Ma, which is almost identical to the earlier dating. Based on biostratigraphy and isotopic data, the Sr isotopic compositions from the Khatyspyt Formation (87Sr/86Sr = 0.70783–0.70806) represent the composition of seawater at 560–550 Ma. Such low values of 87Sr/86Sr ratio in Ediacaran water were probably caused by the quick opening of Iapetus Ocean.

AB - This study provides 87Sr/86Sr, δ13C and δ18O data from the best-preserved limestone and dolomite of the Ediacaran carbonate-dominated Khorbusuonka Group of the Olenek Uplift, NE Siberian Craton, as well as detrital zircon geochronological data from both underlying and overlying sandstones. The Maastakh Formation is characterized by 87Sr/86Sr ratios of ca. 0.70822 and δ13C values between + 4.8 and + 6.0‰. 87Sr/86Sr ratios in limestones of the Khatyspyt Formation are fairly uniform, ranging from 0.70783 to 0.70806. The carbon isotopic composition slowly decreases from bottom (+ 3.7‰) to top (− 0.2‰) of section. The Sr isotopic composition of the Turkut Formation varies from 0.70824 to 0.70914, value of δ13C is about zero: − 0.7…+0.7 ‰. The youngest population of detrital zircons from Maastakh Formation indicates that these rocks were formed not later than 630 Ma. U–Pb detrital zircons data of Kessyusa Group has a single peak at about 543 Ma, which is almost identical to the earlier dating. Based on biostratigraphy and isotopic data, the Sr isotopic compositions from the Khatyspyt Formation (87Sr/86Sr = 0.70783–0.70806) represent the composition of seawater at 560–550 Ma. Such low values of 87Sr/86Sr ratio in Ediacaran water were probably caused by the quick opening of Iapetus Ocean.

KW - Carbon isotopes

KW - Detrital zircons

KW - Ediacaran

KW - Khorbusuonka Group

KW - Northeastern Siberia

KW - Olenek Uplift

KW - Strontium isotopes

KW - CAMBRIAN TRANSITION

KW - SULFUR ISOTOPIC COMPOSITIONS

KW - U-PB

KW - STRONTIUM

KW - INTEGRATED CHEMOSTRATIGRAPHY

KW - CARBONATE

KW - LATE PRECAMBRIAN ROCKS

KW - PATOM COMPLEX

KW - INTRABASINAL CORRELATION

KW - SR

UR - http://www.scopus.com/inward/record.url?scp=85032949439&partnerID=8YFLogxK

U2 - 10.1016/j.gr.2017.07.010

DO - 10.1016/j.gr.2017.07.010

M3 - Article

AN - SCOPUS:85032949439

VL - 51

SP - 255

EP - 271

JO - Gondwana Research

JF - Gondwana Research

SN - 1342-937X

ER -