BENTONITES IN THE BOTTOM OF LOWER SILURIAN LONGMAXI FORMATION ON THE WESTERN MARGIN OF YANGTZE PLATE: Zircon U-Pb Age, Trace Element Characteristics and Geological Implication

WANG Wan-neng; PANG Zhan-ji; WANG Hao-yu; WANG Dong-hui; YU Yi-fan

doi:10.13686/j.cnki.dzyzy.2023.06.005

2023 Vol. 32, No. 6

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Article navigation > Geology and Resources > 2023 > 32(6): 691-698

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WANG Wan-neng, PANG Zhan-ji, WANG Hao-yu, WANG Dong-hui, YU Yi-fan. BENTONITES IN THE BOTTOM OF LOWER SILURIAN LONGMAXI FORMATION ON THE WESTERN MARGIN OF YANGTZE PLATE: Zircon U-Pb Age, Trace Element Characteristics and Geological Implication[J]. Geology and Resources, 2023, 32(6): 691-698. doi: 10.13686/j.cnki.dzyzy.2023.06.005

Citation:

WANG Wan-neng, PANG Zhan-ji, WANG Hao-yu, WANG Dong-hui, YU Yi-fan. BENTONITES IN THE BOTTOM OF LOWER SILURIAN LONGMAXI FORMATION ON THE WESTERN MARGIN OF YANGTZE PLATE: Zircon U-Pb Age, Trace Element Characteristics and Geological Implication[J]. Geology and Resources, 2023, 32(6): 691-698. doi: 10.13686/j.cnki.dzyzy.2023.06.005

BENTONITES IN THE BOTTOM OF LOWER SILURIAN LONGMAXI FORMATION ON THE WESTERN MARGIN OF YANGTZE PLATE: Zircon U-Pb Age, Trace Element Characteristics and Geological Implication

Kunming Natural Resources Comprehensive Survey Center, CGS, Kunming 650000, China

More Information

Corresponding author: WANG Dong-hui, 122694975@qq.com

Received Date: 18 August 2022

Revised Date: 26 October 2022

Publish Date: 25 December 2023

Abstract

Abstract

Bentonites are widely distributed and developed in several layers in the Ordovician-Silurian boundary, which is of great significance for the study of stratigraphic chronology, stratigraphic correlation, event stratigraphy and mass extinction in the period. The zircon U-Pb dating of bentonites in the bottom of Upper Ordovician-Lower Silurian Longmaxi Formation in Yongshan area on the western margin of Yangtze Plate yields the weighted average age of 443.5±1.7 Ma, which defines the sedimentary age of the strata and provides a reliable basis for the study of Ordovician-Silurian volcanic eruption event and stratigraphic chronology on the western margin of Yangtze Plate, as well as basic information for the establishment of Ordovician-Silurian high-resolution stratigraphic framework on the periphery of Yangtze Plate. The trace element characteristics of zircon show the features of I-type granite formed in magmatic arc or orogenic belt. The multi-stage and high-frequency volcanic activity in the Late Ordovician-Early Silurian is possibly the dominant factor causing the mass extinction.
- Yangtze Plate /
- bentonite /
- zircon U-Pb age /
- trace element /
- mass extinction

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References

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