Late Triassic (Norian) strontium and oxygen isotopes from the Baoshan block, southwestern China: Possible causes and implications for climate change

Chen Y, Zeng W, Joachimski M, Wignall PB, Ogg JG, Jiang H, Zhang M, Lai X (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Palaeogeography, Palaeoclimatology, Palaeoecology Elsevier

Pages Range: 112378

Article Number: 112378

DOI: 10.1016/j.palaeo.2024.112378

Abstract

The Norian Stage (Late Triassic) has long been regarded as an interval of stable climates, but, in fact, there are only sparse studies of the paleoclimate variations during this longest (>20 Myr) stage of the Phanerozoic. Here, oxygen and strontium isotopes have been measured on conodont apatite from the open-marine shelf succession at the Xiquelin section (Baoshan terrane, Yunnan Province, China). Magnetostratigraphy linked to conodont biostratigraphy indicates that the succession was deposited during the Sevatian substage, upper Norian. The δ18Oapatite values from conodonts indicate that low-latitude average sea-surface temperatures in eastern Tethys were ~ 32 °C during the earliest Sevatian, cooled to ~25 °C through the middle Sevatian, and then increased again to ~29 °C by the late Sevatian. The seawater 87Sr/86Sr values maintained a high plateau through the entire Sevatian, with very little variation between inferred warm and cool episodes. The possible explanation for the observed trends in sea-surface temperature and 87Sr/86Sr during Sevatian is an enhanced weathering of silicates exposed during the closure of the Paleo-Tethys Ocean at the zenith of Pangea supercontinent assembly.

Authors with CRIS profile

Michael Joachimski Lehrstuhl für Geologie (Exogene Dynamik)

Involved external institutions

China University of Geosciences / 中国地质大学 CN China (CN) University of Leeds GB United Kingdom (GB)

How to cite

APA:

Chen, Y., Zeng, W., Joachimski, M., Wignall, P.B., Ogg, J.G., Jiang, H.,... Lai, X. (2024). Late Triassic (Norian) strontium and oxygen isotopes from the Baoshan block, southwestern China: Possible causes and implications for climate change. Palaeogeography, Palaeoclimatology, Palaeoecology, 112378. https://doi.org/10.1016/j.palaeo.2024.112378

MLA:

Chen, Yan, et al. "Late Triassic (Norian) strontium and oxygen isotopes from the Baoshan block, southwestern China: Possible causes and implications for climate change." Palaeogeography, Palaeoclimatology, Palaeoecology (2024): 112378.

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