气候变化领域集成服务门户(CCPortal): Trace Elemental Partitioning on Clays Derived From Hydrothermal Muds of the El Tatio Geyser Field, Chile

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DOI	10.1029/2020JB021422
	Trace Elemental Partitioning on Clays Derived From Hydrothermal Muds of the El Tatio Geyser Field, Chile
	Hao W.; Mänd K.; Swaren L.; Myers K.D.; Lalonde S.; Wilmeth D.T.; Van Zuilen M.; Wilson S.A.; Alessi D.S.; Konhauser K.O.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Recent experimental studies have demonstrated that clay minerals (e.g., kaolinite, illite, and montmorillonite) have higher affinities for some trace elements under acidic versus alkaline conditions. This suggests that clays might be important vectors in the transport of trace elements from sites of acidic chemical weathering on land to marine depositional environments. To determine if clays behave similarly in nature, we collected water and mud (consisting of 38.5%–61.1% of kaolinite and montmorillonite) samples from boiling, low-pH, mud pools venting at the El Tatio Geyser Field (ETGF) in Chile. Based on elemental abundances in the aqueous/solid phases, we observed that mud samples collected from lower pH pools (e.g., pH = 2.42 and 3.55) have high concentration factors for anionic elements (e.g., P and As) but low concentration factors for cationic elements (e.g., Ca, Mn, and Sr), while mud samples from higher pH pools (e.g., pH = 4.87 and 5.84) display the opposite trend. Acid-base leaching experiments further reveal that increasing solution pH (to reflect downstream transport) led to the release of As and P from the mud surfaces due to increasingly negative surface charge, while decreasing pH (to determine the effects of re-acidification) released Li, Ca, Co, Sr, Mo, and Cd. Our study confirms previous experimental findings that demonstrate clay minerals can assemble a diverse inventory of trace elements during acid weathering (e.g., As) but then liberate them back into the aqueous phase as aqueous pH increases. Importantly, these observations provide a mechanism to account for the previous observations of regional As contamination in rivers downstream of the ETGF. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	clay minerals; El Tatio Geyser field; mud pool; trace elements
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187173
作者单位	Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Department of Geology, University of Tartu, Tartu, Estonia; Institut de physique du globe de Paris, CNRS, Université de Paris, Paris, France; Laboratoire Géosciences Océan, Institut Universitaire Européen de la Mer, Plouzané, France
推荐引用方式 GB/T 7714	Hao W.,Mänd K.,Swaren L.,et al. Trace Elemental Partitioning on Clays Derived From Hydrothermal Muds of the El Tatio Geyser Field, Chile[J],2021,126(5).
APA	Hao W..,Mänd K..,Swaren L..,Myers K.D..,Lalonde S..,...&Konhauser K.O..(2021).Trace Elemental Partitioning on Clays Derived From Hydrothermal Muds of the El Tatio Geyser Field, Chile.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Hao W.,et al."Trace Elemental Partitioning on Clays Derived From Hydrothermal Muds of the El Tatio Geyser Field, Chile".Journal of Geophysical Research: Solid Earth 126.5(2021).