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ISSN  2096-3955

CN  10-1502/P

Citation: Li, Y. S., Sun, J. M., Zhang, Z. L., Su, B., Tian, S. C., Cao, M. M. (2020). Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin. Earth Planet. Phys., 4(3), 308–316doi: 10.26464/epp2020030

2020, 4(3): 308-316. doi: 10.26464/epp2020030


Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin


Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China


Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China


University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: JiMin Sun,

Received Date: 2019-12-17
Web Publishing Date: 2020-05-01

Thick sediments from foreland basins usually provide valuable information for understanding the relationships between mountain building, rock denudation, and sediment deposition. In this paper, we report environmental magnetic measurements performed on the Miocene sediments in the Subei Basin, northeastern Tibetan Plateau. Our results show two different patterns. First, the bulk susceptibility and SIRM, ARM, and HIRM mainly reflect the absolute-concentration of magnetic minerals; all have increased remarkably since 13.7 Ma, related to provenance change rather than climate change. Second, the ratios of IRM100mT/SIRM, IRM100mT/IRM30mT, and IRM100mT/IRM60mT, together with the redness and S ratio, reflect the relative-concentration of hematite, being climate-dependent. Their vertical changes correlate in general with the long-term Miocene climatic records of marine oxygen isotope variations, marked by the existence of higher ratios between 17 and 14 Ma. This may imply that global climate change, rather than uplift of the Tibetan Plateau, played a dominant role in the long-term climatic evolution of the Subei area from the early to middle Miocene.

Key words: Environmental magnetism; MMCO; global cooling; the Subei Basin

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Paleoclimatic and provenance implications of magnetic parameters from the Miocene sediments in the Subei Basin

YouSheng Li, JiMin Sun, ZhiLiang Zhang, Bai Su, ShengChen Tian, MengMeng Cao