Editor(s)
Hu, Xiu‑Fang
Abstract
Eustasy has commonly been invoked to explain peritidal carbonate cyclicity, but is difficult to explain cycles formed in a greenhouse climate when eustasy is minimal. We propose that peritidal cycles on an Early Triassic isolated carbonate platform in Guizhou, South China, were formed by hierarchical carbonate productivity variations. Most of the 149 shallowing-upward cycles are typically terminated by flooding over intertidal facies and contain rare supratidal facies and no prolonged subaerial exposure. Low-diversity benthos in the platform interior during the post-end-Permian biotic recovery were sensitive to environmental perturbations, which caused variations in benthic sediment productivity in the subtidal carbonate factory. The perturbations may be driven by changes in salinity and degree of eutrophication, or repeated platform mini-drowning by anoxic and/or CO2-charged deep water upwelled onto the banktop. They were modulated by Milankovitch orbitally-driven climatic and oceanographic factors as suggested by the hierarchical stacking pattern and spectral signals of these cycles. A one-dimensional conceptual model shows that hierarchical productivity variations alone may generate hierarchical peritidal carbonate cycles under conditions of constant subsidence and no sea-level fluctuation.
Recommended Citation
W. Yang and D. J. Lehrmann, "Peritidal Carbonate Cycles Induced by Carbonate Productivity Variations: A Conceptual Model for an Isolated Early Triassic Greenhouse Platform in South China," Journal of Palaeogeography, vol. 3, no. 2, pp. 115 - 126, China University of Petroleum Beijing, Apr 2014.
The definitive version is available at https://doi.org/10.3724/SP.J.1261.2014.00047
Department(s)
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Carbonate; Climate; Cycle; Peritidal; Productivity; South China; Triassic
Geographic Coverage
South China
Time Period
Triassic
International Standard Serial Number (ISSN)
2095-3836
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2014 China University of Petroleum Beijing, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Publication Date
01 Apr 2014
Comments
Open Access funded by China University of Petroleum (Beijing)