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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/06112422064
Metazoan-algal benthic ecosystems enhance automicritic slope boundstone: The Triassic Great Bank of Guizhou carbonate platform, Xiliang margin, China
Brian M. Kelley,1 Daniel J. Lehrmann,2 Meiyi Yu,3 Kimberly V. Lau,4 Demir Altiner,5 Marcello Minzoni,6 Paul Enos,7 Xiaowei Li,8 and Jonathan L. Payne9
1Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania; [email protected]
2Geosciences Department, Trinity University, San Antonio, Texas; [email protected]
3Department of Resources and Environmental Engineering, Guizhou University, Huaxi, Guizhou Province, China; [email protected]
4Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania; [email protected]
5Department of Geological Engineering, Middle East Technical University, Ankara, Turkey; [email protected]
6Department of Geological Sciences, University of Alabama, Tuscaloosa, Alabama; [email protected]
7Department of Geology, University of Kansas, Lawrence, Kansas; [email protected]
8Department of Resources and Environmental Engineering, Guizhou University, Huaxi, Guizhou Province, China; [email protected]
9Department of Earth and Planetary Sciences, Stanford University, Stanford, California; [email protected]
ABSTRACT
Carbonate platforms with automicritic boundstone slopes differ from detrital platforms in their architecture and reservoir properties. The controls on the occurrence of automicritic boundstone slopes are poorly constrained, but they have generally been associated with depleted reefs and other 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 southern 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 yr after extinction. Beginning in upper Spathian strata, automicrite forms small (P
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