Late Albian–early Turonian calcareous nannofossils from southern Tibet — Implications for preservation, biostratigraphy and palaeoecology

verfasst von: Meiling Han, Gang Li, Ulrich Heimhofer, Jörg Mutterlose
Abstract: Marine strata of Cretaceous age are widely distributed and well exposed in the Gamba area of South Tibet. A pre-requisite for understanding the depositional and palaeoenvironmental processes, which formed these deposits, is a reliable stratigraphic framework. The strata of the Qiangdong section in the Gamba area yielded calcareous nannofossils which provide a powerful tool for establishing a detailed biostratigraphic subdivision. They also allow for supra-regional correlation, ideally on a global scale. The current study investigates the preservational state and stratigraphic significance of calcareous nannofossils from 63 samples. A total of 76 species have been identified in the 159 m thick section, allowing for the recognition of seven bioevents (calcareous nannofossil zones UC0 to UC7) covering the upper Albian–lower Turonian interval. The first occurrences of the calcareous nannofossil marker species Corollithion kennedyi (base UC1a, 100.5 Ma) and Quadrum intermedium (base UC5c, 94.1 Ma) constrain the Albian/Cenomanian and Cenomanian/Turonian boundaries in the Qiangdong section. A regional comparison with findings from the Tingri area, about 150 km west of the studied section, enhances the precision of biostratigraphic correlations in South Tibet. The findings emphasize that preservation and diagenetic influence need to be critically considered when interpreting nannofossil assemblages for palaeoenvironmental reconstructions.
Organisationseinheit(en): Institut für Geologie
Abteilung Geologie
AG Sedimentologie, Stratigraphie und Palynologie
Institut für Erdsystemwissenschaften
Externe Organisation(en): Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences
Graduate University of Chinese Academy of Sciences
Ruhr-Universität Bochum
Typ: Artikel
Journal: Cretaceous research
Band: 171
ISSN: 0195-6671
Publikationsdatum: 13.02.2025
Publikationsstatus: Elektronisch veröffentlicht (E-Pub)
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Paläontologie
Ziele für nachhaltige Entwicklung: SDG 14 – Lebensraum Wasser
Elektronische Version(en): https://doi.org/10.1016/j.cretres.2025.106101 (Zugang: Geschlossen)

BibTeX

@article{03d2e366ea4442f0b9cdb694af93faa5,
title = "Late Albian–early Turonian calcareous nannofossils from southern Tibet — Implications for preservation, biostratigraphy and palaeoecology",
abstract = "Marine strata of Cretaceous age are widely distributed and well exposed in the Gamba area of South Tibet. A pre-requisite for understanding the depositional and palaeoenvironmental processes, which formed these deposits, is a reliable stratigraphic framework. The strata of the Qiangdong section in the Gamba area yielded calcareous nannofossils which provide a powerful tool for establishing a detailed biostratigraphic subdivision. They also allow for supra-regional correlation, ideally on a global scale. The current study investigates the preservational state and stratigraphic significance of calcareous nannofossils from 63 samples. A total of 76 species have been identified in the 159 m thick section, allowing for the recognition of seven bioevents (calcareous nannofossil zones UC0 to UC7) covering the upper Albian–lower Turonian interval. The first occurrences of the calcareous nannofossil marker species Corollithion kennedyi (base UC1a, 100.5 Ma) and Quadrum intermedium (base UC5c, 94.1 Ma) constrain the Albian/Cenomanian and Cenomanian/Turonian boundaries in the Qiangdong section. A regional comparison with findings from the Tingri area, about 150 km west of the studied section, enhances the precision of biostratigraphic correlations in South Tibet. The findings emphasize that preservation and diagenetic influence need to be critically considered when interpreting nannofossil assemblages for palaeoenvironmental reconstructions.",
keywords = "Calcareous nannofossil biostratigraphy, Cretaceous, Gamba area, Nannofossil preservation, South Tibet",
author = "Meiling Han and Gang Li and Ulrich Heimhofer and J{\"o}rg Mutterlose",
note = "Publisher Copyright: {\textcopyright} 2025 Elsevier Ltd",
year = "2025",
month = feb,
day = "13",
doi = "10.1016/j.cretres.2025.106101",
language = "English",
volume = "171",
journal = "Cretaceous research",
issn = "0195-6671",
publisher = "Academic Press Inc.",
}