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Dating Precambrian sedimentary carbonate strata by in situ U–Pb isotopes of dolomite

2023; Elsevier BV; Volume: 393; Linguagem: Inglês

10.1016/j.precamres.2023.107088

1872-7433

Suo‐Fei Xiong, Shao‐Yong Jiang, Jian‐xin Zhao, Pan–Pan Niu, Ying Ma, Xing-Yu Bai,

Hydrocarbon exploration and reservoir analysis

Precambrian sedimentary carbonate succession ages are challenging due to the lack of suitable fossil records and mineral chronometers and techniques. Here we present the first result for in situ LA-ICP-MS U–Pb dolomite dating from the Dengying Formation in the Mayuan area, Shaanxi Province, South China. The sample yields a date of 565.0 ± 5.5 Ma (2σ, MSWD = 2.8, n = 47). This age agrees well with regional Ediacaran successions in the Yangtze Block. The new ages are considered alongside regional correlations of Ediacaran successions in South China and help to re-evaluate the chronostratigraphic framework of the Dengying and Doushantuo Formation. It also opens a new window for dating those blind sedimentary carbonate strata, particularly during the Precambrian era.