| DOI: | 10.1306/05171312168
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| Scopus记录号: | 2-s2.0-84888608632
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| 论文题名: | Ordered low-temperature dolomite mediated by carboxyl-group density of microbial cell watts |
| 作者: | Kenward P.A.; Fowle D.A.; Goldstein R.H.; Ueshima M.; González L.A.; Roberts J.A.
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| 刊名: | AAPG Bulletin
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| ISSN: | 0149-1641
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| EISSN: | 1558-9371
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| 出版年: | 2013
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| 发表日期: | 2013
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| 卷: | 97, 期:11 | | 起始页码: | 2113
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| 结束页码: | 2125
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| 语种: | 英语
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| Scopus关键词: | Control experiments
; Disordered phasis
; Dolomite formations
; Exopolymeric substances
; Mechanistic modeling
; Microbial metabolism
; Predictive models
; Saline solutions
; Bacteria
; Calcium
; Cells
; Functional groups
; Metabolism
; Temperature
; Cytology
; biomass
; complexation
; density
; dolomite
; low temperature
; metabolism
; nucleation
; rock
; sulfate
; Archaea
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| Scopus学科分类: | Energy
; Earth and Planetary Sciences
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| 英文摘要: | Abundant in the ancient rock record, early dolomite remains scarce in modem systems at low temperatures (<50°C), even those systems supersaturated with respect to dolomite. This scarcity is attributed to kinetic inhibition including complexation of Mg2+ by water and sulfate, carbonate activity, and Mg:Ca ratio. Recent investigations point to a function for microbial metabolisms and surfaces, in which disordered phases are formed. Here, we report the precipitation of primary ordered dolomite at 30°C, facilitated solely by the cell walls of two nonmetabolizing archaea from saline solutions with an Mg:Ca ratio of 1:1, 5:1, and 10:1, and slightly saturated with respect to dolomite. Control experiments using bacteria and functionalized microspheres did not precipitate dolomite. Archaeal cell wall functional groups were approximately one order of magnitude higher than the bacteria and spheres used in this study. From these results, we propose a mechanistic model in which carboxyl groups associated with cell wall biomass and exopolymeric substances dehydrate Mg ions, further promoting carbonation and leading to dolomite nucleation. These data explain reports of low-temperature dolomite formation associated with numerous microbial metabolic guilds, including bacteria and archaea, and those reported in association with exopolymeric substances or cell wall surfaces, and identify a key and widespread mechanism in the formation of disordered dolomite and ordered primary phases of dolomite at low temperature. Importantly, the functionalized dead and nonmetabolizing biomass is the key in low-temperature dolomite precipitation, not active microbial metabolism. These observations may lead to new predictive models for the distribution of dolomite. © 2013. The American Association of Petroleum Geologists. All rights reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888608632&doi=10.1306%2f05171312168&partnerID=40&md5=085c07d8634b53312cd34e5396bc2438
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/13211
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| Recommended Citation: | |
Kenward P.A.,Fowle D.A.,Goldstein R.H.,et al. Ordered low-temperature dolomite mediated by carboxyl-group density of microbial cell watts[J]. AAPG Bulletin,2013-01-01,97(11)
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