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AAPG Bulletin, Preliminary version published online Ahead of Print 15 June 2024.

Copyright © 2024. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/06112422064

Automicritic slope boundstone unassociated with depleted metazoan-algal benthic ecosystems: the Triassic Great Bank of Guizhou carbonate platform, Xiliang margin, China

Brian M. Kelley1 , Daniel J. Lehrmann2 , Meiyi Yu3 , Kimberly V. Lau1 , Demir Altiner4 , Marcello Minzoni5 , Paul Enos6 , Xiaowei Li3 , and Jonathan L. Payne7

1 Department of Geosciences, Penn State University, University Park, PA 16802, USA
2 Geosciences Department, Trinity University, San Antonio, TX 78212, USA
3 Department of Resources and Environmental Engineering, Guizhou University, Huaxi, Guizhou Province 550025, China
4 Department of Geological Engineering, Middle East Technical University, Dumlupinar Blv. No: 1, 06531 Ankara, Turkey
5 Department of Geological Sciences, University of Alabama, Tuscaloosa, AL 35487, USA
6 Department of Geology, University of Kansas, Lawrence, KS 66045, USA
7 Department of Earth and Planetary Sciences, Stanford University, Stanford, CA 94305, USA

Ahead of Print Abstract

Carbonate platforms with automicritic boundstone slopes differ in their architecture and reservoir properties from detrital platforms, but the controls on their occurrence are poorly constrained. Automicritic boundstone has previously been associated with depleted metazoan-algal benthic ecosystems. To test this association, we investigated automicritic boundstone occurrence across the end-Permian extinction and Triassic biotic recovery on the Xiliang slope of the Great Bank of Guizhou (GBG), an isolated carbonate platform in South China. Our findings indicate that automicritic boundstone accumulation was not enhanced by depleted Early Triassic benthic ecosystems. Instead, detrital sediment dominated the GBG slope, and automicritic boundstone was absent until the late Spathian (latest Early Triassic), 4–5 million years after extinction. Beginning in upper Spathian strata, automicrite forms small (

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Please cite this AAPG Bulletin Ahead of Print article as:

Brian M. Kelley , Daniel J. Lehrmann , Meiyi Yu , Kimberly V. Lau , Demir Altiner , Marcello Minzoni , Paul Enos , Xiaowei Li , Jonathan L. Payne: Automicritic slope boundstone unassociated with depleted metazoan-algal benthic ecosystems: the Triassic Great Bank of Guizhou carbonate platform, Xiliang margin, China, (in press; preliminary version published online Ahead of Print 15 June 2024: AAPG Bulletin, DOI:10.1306/06112422064.

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