Palynofloras across the Triassic–Jurassic boundary on Qinghai-Tibetan Plateau, Southwest China
2025 (English)In: Palaeoworld, ISSN 1871-174X, E-ISSN 1875-5887, Vol. 34, no 4, p. 200910-200910, article id 200910Article in journal (Refereed) Published
Abstract [en]
The Triassic–Jurassic boundary (TJB) of the Qinghai-Tibetan Plateau is exposed at the Germig Section in southern Xizang (Tibet), Southwest China. This marine TJB succession is well-constrained by ammonite and bivalve stratigraphy, providing a robust chronological framework. Based on the palynofloral assemblages from the Germig Section, we recognized two assemblages, one Rhaetian and one Hettangian. The Rhaetian assemblage is dominated by bisaccate pollen, which shifts across the TJB to a Hettangian Classopollis dominated assemblage, reflecting a change from a seed-fern/conifer-dominated flora to one dominated by cheirolepids. This palynofloral change has been recognized elsewhere, but appears to be diachronous across Gondwana. This is highlighted by our study, which demonstrates that the characteristic post-extinction cheirolepid forests appeared earlier at lower latitudes.
Place, publisher, year, edition, pages
Nanjing: Elsevier, 2025. Vol. 34, no 4, p. 200910-200910, article id 200910
Keywords [en]
Pollen and spores, biostratigraphy, Xizang, Triassic–Jurassic boundary, Gondwana
National Category
Palaeontology and Palaeoecology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-6104DOI: 10.1016/j.palwor.2025.200910OAI: oai:DiVA.org:nrm-6104DiVA, id: diva2:2017908
Funder
Swedish Research Council, 2019-04524Swedish Research Council, 2023-03330Swedish Research Council, 2019-4061Swedish Research Council Formas, 2023-00984Knut and Alice Wallenberg Foundation, KAW 2020.0145
Note
This work was supported by National NaturalSciences Foundation of China (grant number 42293280); the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (20231102); the Second Tibetan Plateau Scientific Expedition and Research (2019QZKK0706); the Swedish Research Council (VR)(grant numbers 2019-04524, 2023-03330, for S.S. and 2019-4061 for V.V.); Formas (Swedish Research Councilfor Sustainable Development; 2023-00984 for S.S.); andKnut and Alice Wallenberg Foundation (grant number KAW 2020.0145 for V.V.). We thank Anna FijałkowskaMader and one anonymous reviewer for their detailed evaluation and constructive suggestions on this manuscript.
2025-12-012025-12-012026-01-07Bibliographically approved