Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China
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 hierarchica...
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| Format: | Article |
| Language: | English |
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Elsevier
2014-04-01
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| Series: | Journal of Palaeogeography |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095383615300663 |
| _version_ | 1818971566464040960 |
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| author | Wan Yang Dan J. Lehrmann |
| author_facet | Wan Yang Dan J. Lehrmann |
| author_sort | Wan Yang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-20T14:54:25Z |
| format | Article |
| id | doaj.art-a12e0c453fd94803b36af951c52a0d8a |
| institution | Directory Open Access Journal |
| issn | 2095-3836 |
| language | English |
| last_indexed | 2024-12-20T14:54:25Z |
| publishDate | 2014-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Palaeogeography |
| spelling | doaj.art-a12e0c453fd94803b36af951c52a0d8a2022-12-21T19:36:55ZengElsevierJournal of Palaeogeography2095-38362014-04-013211512610.3724/SP.J.1261.2014.00047Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South ChinaWan Yang0Dan J. Lehrmann1Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, Missouri 65409, USADepartment of Geosciences, Trinity University, San AntonioTX 78212 USAEustasy 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.http://www.sciencedirect.com/science/article/pii/S2095383615300663carbonateperitidalcycleproductivityclimateTriassicSouth China |
| spellingShingle | Wan Yang Dan 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 carbonate peritidal cycle productivity climate Triassic South China |
| title | Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China |
| title_full | Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China |
| title_fullStr | Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China |
| title_full_unstemmed | Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China |
| title_short | Peritidal carbonate cycles induced by carbonate productivity variations: A conceptual model for an isolated Early Triassic greenhouse platform in South China |
| title_sort | peritidal carbonate cycles induced by carbonate productivity variations a conceptual model for an isolated early triassic greenhouse platform in south china |
| topic | carbonate peritidal cycle productivity climate Triassic South China |
| url | http://www.sciencedirect.com/science/article/pii/S2095383615300663 |
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