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Peer-reviewedCC BYApplied Sciences

Middle Jurassic–Lower Cretaceous Depositional Facies Evolution and a Fan-Delta–Beach-Bar Model Based on a Case Study from the Anjihai Section in the Southern Junggar Basin

  • Jiale Liu1
  • Changmin Zhang1
  • An Xie2
  • Xianghui Zhang1
  • Zhiwen Pang2
  • Shaohua Zhao1
  • Jun Guo1
  1. 1School of Geosciences, Yangtze University, Wuhan 430100, China
  2. 2Xinjiang Research Institute of Huairou Laboratory, Urumqi 830011, China
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Abstract

Lake-margin successions preserve interactions between terrestrial sediment supply and lacustrine deposition. We examined the Toutunhe–Qingshuihe succession at the Anjihai section in the western sector of the southern Junggar Basin using outcrop logs, lithofacies descriptions, sedimentary structures, and assemblage relationships. Eighteen lithofacies were organized into eighteen lithofacies assemblages (A–R), interpreted as depositional microfacies and grouped into four depositional facies: lacustrine (FA1), fluvial channel–floodplain (FA2), alluvial-fan (FA3), and shallow-water delta (FA4). Depositional systems constitute the highest level and comprise the stacking of depositional facies. The succession records Toutunhe shallow-water delta–lacustrine deposition (FA4–FA1), Qigu fluvial channel–floodplain deposition (FA2), Kalaza alluvial-fan–lacustrine deposition (FA3–FA1), and Qingshuihe lacustrine deposition (FA1). Repeated sandy–gravelly beds and their association with lacustrine fines support a possible gravelly beach-bar interpretation for parts of the Kalaza Formation. A fan-delta–beach-bar model is proposed for the Anjihai section. The documented facies changes provide a record of depositional evolution for comparison with regional models.

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Cite

BibTeXRIS
BibTeX
@article{liu2026middle,
  title = {{Middle Jurassic–Lower Cretaceous Depositional Facies Evolution and a Fan-Delta–Beach-Bar Model Based on a Case Study from the Anjihai Section in the Southern Junggar Basin}},
  author = {Jiale Liu and Changmin Zhang and An Xie and Xianghui Zhang and Zhiwen Pang and Shaohua Zhao and Jun Guo},
  journal = {Applied Sciences},
  year = {2026},
  month = oct,
  doi = {10.3390/app162010157},
  url = {https://doi.org/10.3390/app162010157},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Middle Jurassic–Lower Cretaceous Depositional Facies Evolution and a Fan-Delta–Beach-Bar Model Based on a Case Study from the Anjihai Section in the Southern Junggar Basin
AU  - Jiale Liu
AU  - Changmin Zhang
AU  - An Xie
AU  - Xianghui Zhang
AU  - Zhiwen Pang
AU  - Shaohua Zhao
AU  - Jun Guo
PY  - 2026
DA  - 2026/10/26
JO  - Applied Sciences
DO  - 10.3390/app162010157
UR  - https://doi.org/10.3390/app162010157
AB  - Lake-margin successions preserve interactions between terrestrial sediment supply and lacustrine deposition. We examined the Toutunhe–Qingshuihe succession at the Anjihai section in the western sector of the southern Junggar Basin using outcrop logs, lithofacies descriptions, sedimentary structures, and assemblage relationships. Eighteen lithofacies were organized into eighteen lithofacies assemblages (A–R), interpreted as depositional microfacies and grouped into four depositional facies: lacustrine (FA1), fluvial channel–floodplain (FA2), alluvial-fan (FA3), and shallow-water delta (FA4). Depositional systems constitute the highest level and comprise the stacking of depositional facies. The succession records Toutunhe shallow-water delta–lacustrine deposition (FA4–FA1), Qigu fluvial channel–floodplain deposition (FA2), Kalaza alluvial-fan–lacustrine deposition (FA3–FA1), and Qingshuihe lacustrine deposition (FA1). Repeated sandy–gravelly beds and their association with lacustrine fines support a possible gravelly beach-bar interpretation for parts of the Kalaza Formation. A fan-delta–beach-bar model is proposed for the Anjihai section. The documented facies changes provide a record of depositional evolution for comparison with regional models.
SN  - 2076-3417
ER  -