High-resolution late Pliocene-quaternary magnetostratigraphy of the Yinchuan Basin, NE Tibetan Plateau. (10th January 2022)

• Record Type: Journal Article
• Authors: Ma, Xuedong; Yin, Gongming; Wei, Chuanyi; Qiang, Xiaoke; Ma, Yuxue; Liu, Chunru; Zhao, Zhipeng; Gong, Liang; Wang, Libin; Ji, Hao; Bai, Minghui; Mao, Jun; Li, Guoqing
• Is Part Of: Quaternary international. Volume 607(2022)
• Page Start: 120
• Page End: 127
• Publication Date: 2022-01-10
• Subjects: Northeastern Tibetan plateau -- Yinchuan basin -- Late pliocene-quaternary -- Fluvio-lacustrine sediment -- Magnetostratigraphy; Geology, Stratigraphic -- Quaternary -- Periodicals; Stratigraphie -- Quaternaire -- Périodiques; 551.79
• DOI: 10.1016/j.quaint.2021.09.009
• Languages: English
• ISSNs: 1040-6182

Abstract

Abstract: The Yinchuan Basin, one of the most important basins in the area adjacent to the northeastern Tibetan Plateau, contains a continuous sequence of fluvio-lacustrine deposits, which makes it an ideal area to study the interactions between the Tibetan Plateau uplift, climate change, and geomorphological evolution. Here, a 1200-m-deep drill core (YNZK01) is described with an average recovery rate of 96% in the depo-center of the Yinchuan Basin to establish a high-resolution palaeoenvironmental and tectonic reconstruction. Stepwise alternating-field demagnetization results showed a stable and high-qualified remanent magnetization of the samples. The polarity sequences consisted of 8 normal and 8 reverse zones that correlate well with the geomagnetic polarity timescale. Magnetostratigraphic results date the entire YNZK01 core from 3.927 Ma to the present. The B/M boundary (0.781 Ma) is at a depth of 246.4 m while the M/G boundary (2.581 Ma) is at a depth of 863.4 m. The G/Gi boundary (3.596 Ma) is identified at 1117.8 m and the bottom of the core was extrapolated to 3.927 Ma (1201 m) with an average sedimentation rate of 863.4–1117.8 m. This high-resolution magnetostratigraphy record provides a baseline chronological framework for further research and publications on the tectonic, paleoclimatic, and paleoenvironmental proxy data of the YNZK01 core in the Yinchuan Basin, NE Tibetan Plateau.