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The aftermath of the CPE and the Carnian–Norian transition in northwestern Sichuan Basin, South China

Xin Jin, Christopher A. McRoberts, Zhiqiang Shi, Paolo Mietto, Manuel Rigo, Guido Roghi, Stefano Manfrin, Marco Franceschi and View ORCID ProfileNereo Preto
Journal of the Geological Society, 176, 179-196, 18 December 2018, https://doi.org/10.1144/jgs2018-104
Xin Jin
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
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Christopher A. McRoberts
3Department of Geology, State University of New York at Cortland, P.O. Box 2000, Cortland, NY 13045, USA
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Zhiqiang Shi
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
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Paolo Mietto
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Manuel Rigo
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Guido Roghi
4Istituto di Geoscienze e Georisorse (IGG-CNR), Via G. Gradenigo 6, 35131 Padova, Italy
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Stefano Manfrin
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Marco Franceschi
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Nereo Preto
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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  • ORCID record for Nereo Preto
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Abstract

The northwestern Sichuan Basin (South China) was a portion of eastern Tethys where, during the Late Triassic, a sharp lithological transition from oolitic–bioclastic limestones and sponge reef mounds to dark grey terrigenous clays, siltstones and sandstones is visible in several localities. The timing and significance of this major facies transition is still unclear. Here we report new biostratigraphic and carbon stable isotope data from Hanwang and Jushui, northwestern Sichuan Basin. Sporomorphs, ammonoids, conodonts and halobiid bivalves show that the lithological change is Late Carnian to Early Norian in age. This amended age determination facilitates recalibration of the magnetostratigraphy in the area allowing correlation between the Late Triassic of the Sichuan Basin and the Astrochronostratigraphic Polarity Time Scale. A carbon stable isotopic perturbation across the Carnian–Norian Boundary (CNB) is missing in our sections, or it is concealed because of the mixed organic matter sources. Our findings pinpoint the position of the CNB to a short stratigraphic interval of c. 12 m thickness in the Sichuan Basin. The studied sections greatly extend the palaeogeographical documentation of the CNB and provide novel information on biostratigraphy and chemostratigraphy that should be considered in defining the best position of the Norian Global Stratotype Section and Point.

  • © 2018 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 176 (1)
Journal of the Geological Society
Volume 176, Issue 1
January 2019
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The aftermath of the CPE and the Carnian–Norian transition in northwestern Sichuan Basin, South China

Xin Jin, Christopher A. McRoberts, Zhiqiang Shi, Paolo Mietto, Manuel Rigo, Guido Roghi, Stefano Manfrin, Marco Franceschi and Nereo Preto
Journal of the Geological Society, 176, 179-196, 18 December 2018, https://doi.org/10.1144/jgs2018-104
Xin Jin
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
  • Find this author on Google Scholar
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  • For correspondence: [email protected]
Christopher A. McRoberts
3Department of Geology, State University of New York at Cortland, P.O. Box 2000, Cortland, NY 13045, USA
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Zhiqiang Shi
2State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China
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Paolo Mietto
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Manuel Rigo
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Guido Roghi
4Istituto di Geoscienze e Georisorse (IGG-CNR), Via G. Gradenigo 6, 35131 Padova, Italy
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Stefano Manfrin
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Marco Franceschi
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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Nereo Preto
1Dipartimento di Geoscienze, Università degli Studi di Padova, Via G. Gradenigo 6, Padova, Italy
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  • ORCID record for Nereo Preto

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The aftermath of the CPE and the Carnian–Norian transition in northwestern Sichuan Basin, South China

Xin Jin, Christopher A. McRoberts, Zhiqiang Shi, Paolo Mietto, Manuel Rigo, Guido Roghi, Stefano Manfrin, Marco Franceschi and Nereo Preto
Journal of the Geological Society, 176, 179-196, 18 December 2018, https://doi.org/10.1144/jgs2018-104
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