Sveite from the Northeastern San Joaquin Valley, California

IF 1.1 4区 地球科学 Q3 MINERALOGY
R. C. Peterson, R. Graham, J. Ervin, I. Kozin, J. Sickman, K. Bozhilov, J. Reid
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引用次数: 0

Abstract

Sveite [KAl7(NO3)4(OH)16Cl2·8H2O] first described from Venezuela and material recently collected from northern California have similar X-ray diffraction patterns and chemical compositions. The main difference in the chemical composition is the absence of significant chlorine and sulfate in the sveite from California. The changes observed by X-ray diffraction upon hydration and the SEM images of the crystals suggest a layered atomic structure. Water-extractable NO3 in the Venezuelan sveite sample is isotopically enriched in δ15N and δ18O and likely was affected by the microbial process of denitrification. In contrast, the extractable nitrate from the California sveite is less isotopically enriched than the Venezuelan mineral and there is only modest evidence that denitrification had affected its isotopic composition. Overall, the nitrate in the California sveite is isotopically similar to nitrate present in acidic soils overlying the mineral occurrence, suggesting a general biogenic source of uric acid from bird feces for the mineral-bound nitrogen.
来自加利福尼亚州圣华金谷东北部的斯维特
首次从委内瑞拉描述的斯维特[KAl7(NO3)4(OH)16Cl2·8H2O]和最近从加利福尼亚州北部收集的材料具有相似的X射线衍射图案和化学成分。化学成分的主要差异是来自加利福尼亚州的sveite中不存在显著的氯和硫酸盐。通过水合后的X射线衍射观察到的变化和晶体的SEM图像表明了层状原子结构。委内瑞拉sveite样品中的水可提取NO3同位素富集δ15N和δ18O,可能受到微生物反硝化过程的影响。相比之下,来自加利福尼亚sveite的可提取硝酸盐的同位素富集度低于委内瑞拉矿物,只有少量证据表明反硝化作用影响了其同位素组成。总的来说,加州sveite中的硝酸盐在同位素上与矿床上酸性土壤中的硝酸根相似,这表明鸟类粪便中的尿酸是矿物结合氮的一般生物来源。
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来源期刊
Canadian Mineralogist
Canadian Mineralogist 地学-矿物学
CiteScore
2.20
自引率
22.20%
发文量
45
审稿时长
4-8 weeks
期刊介绍: Since 1962, The Canadian Mineralogist has published papers dealing with all aspects of mineralogy, crystallography, petrology, economic geology, geochemistry, and applied mineralogy.
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