U–Pb dating of zircons from tuff layer, sandstone and tillite samples in the uppermost Liantuo Formation and the lowermost Nantuo Formation in Three Gorges area, South China

Uranium-lead (U–Pb) dating was conducted on zircons in tuff layers and sandstone samples from the uppermost Liantuo Formation and in a tillite sample from the lowermost Nantuo Formation in Three Gorges area, South China, using SHRIMP and LA-ICP-MS techniques. Zircons from these samples yielded age s...

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Bibliographic Details
Published inChemie der Erde Vol. 76; no. 1; pp. 103 - 109
Main Authors Pi, Dao-Hui, Jiang, Shao-Yong
Format Journal Article
LanguageEnglish
Published Elsevier GmbH 01.03.2016
Subjects
Liantuo Formation
South China
Three Gorges
U–Pb dating
Zircon
Liantuo Formation
Three Gorges
South China
U–Pb dating
Zircon
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Summary:Uranium-lead (U–Pb) dating was conducted on zircons in tuff layers and sandstone samples from the uppermost Liantuo Formation and in a tillite sample from the lowermost Nantuo Formation in Three Gorges area, South China, using SHRIMP and LA-ICP-MS techniques. Zircons from these samples yielded age spectrum (within 1000Ma) of ∼890, ∼830, ∼780, ∼730, and 646Ma. Zircons from the Liantuo tuffs have a weighted mean 206Pb/238U age of 734.1±8.1Ma (2σ, n=7, MSWD=0.48), which was regarded as the best estimation of the upper boundary age of the Liantuo Formation. Combining with previous geochronologic data, the Liantuo Formation was proposed to be a pre-Chang′an glaciation unit, and it is comparable to the middle-upper Banxi/Danzhou Group in South China.
ISSN:0009-2819
1611-5864
DOI:10.1016/j.chemer.2015.12.003