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Issue: Vol. 1 No. 3: September 2024
Type: Article
Published: 2024-09-26
DOI: 10.11646/mesozoic.1.3.6
Page range: 264-275
Abstract views: 118
PDF downloaded: 71

New zircon U-Pb age of the top Duoni Formation, Basu County: constraits on the collision between Qiangtang and Lhasa blocks in Eastern Tibet

State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
School of Earth Sciences, East China University of Technology, Nanchang, Jiangxi 330013, China
School of Resources and Environment, Xichang University, Xichang 615000, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Early Cretaceous Aptain–Albian Bangong-Nujiang belt Zircon U-Pb

Abstract

The Duoni Formation is widely distributed along the Bangong-Nujiang suture belt and surrounding blocks in Tibet, serving as a key sedimentary record of the collision between the Qiangtang and Lhasa blocks. The upper sections of the formation typically contain andesite, volcanic rocks and tuff offering potential for precise stratigraphic correlations across the suture belt. The Duoni Formation in the central and western belt has been well-constrained geochronologically through zircon U-Pb dating; however, the insufficient age constraints on Duoni Formation in eastern Tibet hinder effective stratigraphic correlation and limit the understanding of the timing of this collision. Building on prior stratigraphic and paleontological studies, we collected three tuff samples from the upper Duoni Formation at the Wada coal mine section in Basu County, eastern Tibet. Zircon U-Pb dating was used to determine the age of the Duoni Formation, yielding results of 112.8 ± 1.0 Ma for sample XZ01, 111.48 ± 0.37 Ma for sample XZ03, and 110.95 ± 0.41 Ma for sample XZ05. These absolute ages correspond with early Albian and are generally consistent with those absolute ages from the central and western suture belt. Our study therefore suggests the similar timing for the Qiangtang-Lhasa collision across the whole Bangong-Nujiang belt.

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