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

被引：27

作者：

Vishnevskaya, Irina A. ^{[1
,2
]}

Letnikova, Elena F. ^{[1
]}

Vetrova, Natalia I. ^{[1
]}

Kochnev, Boris B. ^{[2
,3
]}

Dril, Sergei I. ^{[4
]}

机构：

[1] Russian Acad Sci, Sobolev Inst Geol & Mineral, Siberian Branch, 3 Koptyug Ave, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia

[3] Russian Acad Sci, Trofimuk Inst Petr Geol & Geophys, Siberian Branch, 3 Koptyug Ave, Novosibirsk 630090, Russia

[4] Russian Acad Sci, Siberian Branch, Vinogradov Inst Geochem, 1A Favorsky Str, Irkutsk 664033, Russia

来源：

GONDWANA RESEARCH | 2017年 / 51卷

基金：

俄罗斯科学基金会;

关键词：

Ediacaran; Strontium isotopes; Carbon isotopes; Detrital zircons; Olenek Uplift; Northeastern Siberia; Khorbusuonka Group; SULFUR ISOTOPIC COMPOSITIONS; LATE PRECAMBRIAN ROCKS; INTEGRATED CHEMOSTRATIGRAPHY; INTRABASINAL CORRELATION; CAMBRIAN TRANSITION; PATOM COMPLEX; U-PB; SR; STRONTIUM; CARBONATE;

D O I：

10.1016/j.gr.2017.07.010

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This study provides Sr-87/Sr-86, 613C and 8180 data from the best-preserved limestone and dolomiteof 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 Sr-87/Sr-86 ratios of ca. 0.70822 and delta C-13 values between +4.8 and +6.0%a. Sr-87/Sr-86 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%a) of section. The Sr isotopic composition of the Turkut Formation varies from 0.70824 to 0.70914, value of delta C-13 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 (Sr-87/Sr-86 = 0.70783-0.70806) represent the composition of seawater at 560-550 Ma. Such low values of Sr-87/Sr-86 ratio in Ediacaran water were probably caused by the quick opening of Iapetus Ocean. (C) 2017 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

引用

页码：255 / 271

页数：17

共 81 条

[1] STRONTIUM ISOTOPIC VARIATIONS OF NEOPROTEROZOIC SEAWATER - IMPLICATIONS FOR CRUSTAL EVOLUTION [J].