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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; brian.kelley@psu.edu
2Geosciences Department, Trinity University, San Antonio, Texas; dlehrmann@trinity.edu
3Department of Resources and Environmental Engineering, Guizhou University, Huaxi, Guizhou Province, China; 18685051210@163.com
4Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania; kvlau@psu.edu
5Department of Geological Engineering, Middle East Technical University, Ankara, Turkey; demir@metu.edu.tr
6Department of Geological Sciences, University of Alabama, Tuscaloosa, Alabama; mminzoni@ua.edu
7Department of Geology, University of Kansas, Lawrence, Kansas; enos@ku.edu
8Department of Resources and Environmental Engineering, Guizhou University, Huaxi, Guizhou Province, China; geo.xwli@gmail.com
9Department of Earth and Planetary Sciences, Stanford University, Stanford, California; jlpayne@stanford.edu
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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