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| DOI | 10.1016/j.earscirev.2018.12.016 |
| Decoding the mechanism of formation in marine ooids: A review | |
| Diaz M.R.; Eberli G.P. | |
| 发表日期 | 2019 |
| ISSN | 00128252 |
| 起始页码 | 536 |
| 结束页码 | 556 |
| 卷号 | 190 |
| 英文摘要 | Ooid shoals, sedimentary structures consisting of carbonate grains, are often used as proxies to explore changes in seawater chemistry over Earth history. Despite their importance as contributors to the global carbonate budget and as paleo-environmental indicators for water depth, pH, temperature and water energy, the mechanism of formation of these concentric, sub-spherical concretions of tangentially or radially arranged aragonite or calcite crystals is still the subject of intense debate. Unlike oncoids, whose microbial origins are well acknowledged, ooids are traditionally viewed as abiotic grains, mainly produced in suspension by agitated, warm waters that are supersaturated with respect to CaCO 3 . Yet, there is considerable evidence, including geochemical bio-signatures and detection of viable microbes capable of mineralization and biofilm production and degradation, to suggest otherwise. The emergence of new and sophisticated technologies reveals that the level of microbial diversity of these sedimentary grains exceeds that of some microbialite systems. These findings have refined our understanding of ooid genesis and ooid accretion processes and argue toward microbial mediation both as a direct result of metabolic activities inducing changes in the environment conducive to precipitation and by a passive mechanism, in which mucilaginous extracellular polymeric substances (EPS) act as a template for mineral nucleation. Furthermore, new developments in the field indicate that carbonate mineralization in marine ooids occurs through sequential precipitations that involve an amorphous calcium carbonate phase (ACC), which some argue are of biotic origins. Herein, we discuss the most relevant theories of ooid formation, including some of the early pioneering studies that laid the groundwork for new theories attempting to decode the origins of these controversial grains. © 2018 Elsevier B.V. |
| 关键词 | Amorphous calcium carbonateCarbonate precipitationEPSMicrobe-mineral interactionsMicrobial metabolismOoidsOrganomineralization |
| 英文关键词 | amorphous medium; calcium carbonate; literature review; metabolism; microbial activity; ooid; paleoenvironment; precipitation (chemistry) |
| 语种 | 英语 |
| 来源期刊 | Earth Science Reviews
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/203416 |
| 作者单位 | Department of Marine Geosciences, Rosenstiel School of Marine and Atmospheric Science, University of MiamiFL 33149, United States |
| 推荐引用方式 GB/T 7714 | Diaz M.R.,Eberli G.P.. Decoding the mechanism of formation in marine ooids: A review[J],2019,190. |
| APA | Diaz M.R.,&Eberli G.P..(2019).Decoding the mechanism of formation in marine ooids: A review.Earth Science Reviews,190. |
| MLA | Diaz M.R.,et al."Decoding the mechanism of formation in marine ooids: A review".Earth Science Reviews 190(2019). |
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