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DOI | 10.1073/pnas.1821065116 |
Organic-mineral interfacial chemistry drives heterogeneous nucleation of Sr-rich (Ba-x, Sr1-x)SO4 from undersaturated solution | |
Deng, Ning1; Stack, Andrew G.2; Weber, Juliane2; Cao, Bo1; De Yoreo, James J.3,4; Hu, Yandi1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:27页码:13221-13226 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Sr-bearing marine barite [(Ba-x, Sr1-x)SO4] cycling has been widely used to reconstruct geochemical evolutions of paleoenvironments. However, an understanding of barite precipitation in the ocean, which is globally undersaturated with respect to barite, is missing. Moreover, the reason for the occurrence of higher Sr content in marine barites than expected for classical crystal growth processes remains unknown. Field data analyses suggested that organic molecules may regulate the formation and composition of marine barites; however, the specific organic-mineral interactions are unclear. Using in situ grazing incidence small-angle X-ray scattering (GISAXS), size and total volume evolutions of barite precipitates on organic films were characterized. The results show that barite forms on organic films from undersaturated solutions. Moreover, from a single supersaturated solution with respect to barite, Sr-rich barite nanoparticles formed on organics, while micrometer-size Sr-poor barites formed in bulk solutions. Ion adsorption experiments showed that organic films can enrich cation concentrations in the adjacent solution, thus increasing the local supersaturation and promoting barite nucleation on organic films, even when the bulk solution was undersaturated. The Sr enrichment in barites formed on organic films was found to be controlled by solid-solution nucleation rates; instead, the Sr-poor barite formation in bulk solution was found to be controlled by solid-solution growth rates. This study provides a mechanistic explanation for Sr-rich marine barite formation and offers insights for understanding and controlling the compositions of solid solutions by separately tuning their nucleation and growth rates via the unique chemistry of solution-organic interfaces. |
英文关键词 | Sr-rich marine barite organic-mineral interactions solid solution nucleation and growth paleoenvironments |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000473427900017 |
WOS关键词 | MARINE BARITE ; SATURATION STATE ; SOLID-SOLUTION ; IN-SITU ; GROWTH ; PRECIPITATION ; QUARTZ ; WATER ; THERMODYNAMICS ; SCATTERING |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205135 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Houston, Dept Civil & Environm Engn, Houston, TX 77004 USA; 2.Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37831 USA; 3.Pacific Northwest Natl Lab, Phys Sci Div, Richland, WA 99354 USA; 4.Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Deng, Ning,Stack, Andrew G.,Weber, Juliane,et al. Organic-mineral interfacial chemistry drives heterogeneous nucleation of Sr-rich (Ba-x, Sr1-x)SO4 from undersaturated solution[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(27):13221-13226. |
APA | Deng, Ning,Stack, Andrew G.,Weber, Juliane,Cao, Bo,De Yoreo, James J.,&Hu, Yandi.(2019).Organic-mineral interfacial chemistry drives heterogeneous nucleation of Sr-rich (Ba-x, Sr1-x)SO4 from undersaturated solution.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(27),13221-13226. |
MLA | Deng, Ning,et al."Organic-mineral interfacial chemistry drives heterogeneous nucleation of Sr-rich (Ba-x, Sr1-x)SO4 from undersaturated solution".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.27(2019):13221-13226. |
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