Separating Si phases from diagenetically-modified sediments through sequential leaching

doi:10.1016/j.chemgeo.2023.121681

	Separating Si phases from diagenetically-modified sediments through sequential leaching
	Huang, Tzu-Hao 1; Sun, Xiaole 2,3; Somelar, Peeter 4; Kirsimae, Kalle 4; Pickering, Rebecca A.5; Kim, Ji-Hoon 6; Kielman-Schmitt, Melanie 7; Hong, Wei-Li 1,3
	2023-10-20
发表期刊	CHEMICAL GEOLOGY
ISSN	0009-2541
卷号	637 页码:12
通讯作者	Huang, Tzu-Hao(tzu-hao.huang@geo.su.se) ; Hong, Wei-Li(wei-li.hong@geo.su.se)
摘要	Silicon (Si) phases such as biogenic silica, lithogenic silicate and authigenic silica/silicate in marine sediments provide valuable information about past Si cycling. Wet-chemical sequential leaching methods are often applied to extract different Si phases from marine sediments to study Si diagenetic processes in shallow subsurface. The potential of this method to separate Si phases from deeply-buried and diagenetically-modified sediments has not been systematically examined. We applied a sequential leaching protocol to drill core sediments retrieved from the Ulleung Basin, East/Japan Sea. We performed geochemical (elemental abundance and stable Si isotopes, 830Si) and microscopic (X-ray diffraction and scanning electron microscope) analyses to monitor leaching efficiency in separating different Si phases. We show that, prior to alkaline leaching, applying weak acid is able to remove metal oxide and/or clay-like phases. The following Na2CO3 leaching, based on a commonly-adopted protocol, is able to dissolve some but not all diatoms. The results of elemental contents and 830Si values of leachates suggest that, in diagenetically-modified sediments, either a longer digesting time or a harsher alkaline leaching is needed to dissolve all diatoms. This is attributed to increased resistance of diatoms to Na2CO3 leaching as a result of reduced surface area and/or improved SiO2 tetrahedron ordering during diagenetic processes over time and burial depths. Lithogenic silicate minerals can be dissolved by NaOH and potentially separated from diatoms if the latter is completely removed in the preceding leaching steps. Even if a trace amount of diatom is left undissolved in the NaOH leaching, it is still possible to separate the two through a mass balance calculation given the knowledge of composition for the two end-members. We conclude that a successful separation of Si phases in diagenetically modified sediments relies on the knowledge of elemental abundance and even 830Si values of the leachates, as well as information such as species of Si-skeleton organisms, contents and maturation degree of biogenic silica.
DOI	10.1016/j.chemgeo.2023.121681
收录类别	SCI
语种	英语
资助项目	Ragnar Soderbergs stiftelse[1/22-A] ; European Research Council (ERC)[101087884] ; Korea Ministry of Science and ICT[GP2021-009] ; NordSIM-Vegacenter for the analyses of stable silicon isotopes ; Swedish Research Council[2021-00276] ; Swedish Research Council[2021-00276] ; European Research Council (ERC)[101087884]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001068084700001
出版者	ELSEVIER
WOS关键词	SILICON ISOTOPE FRACTIONATION ; CENTRAL EQUATORIAL PACIFIC ; BIOGENIC SILICA ; ULLEUNG BASIN ; CHEMICAL PROPERTIES ; EARLY DIAGENESIS ; MARINE SPONGES ; SOUTHERN-OCEAN ; SURFACE-AREA ; AMAZON DELTA
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/181845
专题	深海极端环境与生命过程研究中心
通讯作者	Huang, Tzu-Hao; Hong, Wei-Li
作者单位	1.Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 3.Stockholm Univ, Balt Sea Ctr, Stockholm S-10691, Sweden 4.Univ Tartu, Dept Geol, EE-50411 Tartu, Estonia 5.Lund Univ, Dept Geol, S-22362 Lund, Sweden 6.Korea Inst Geosci & Mineral Resources, Marine Geol & Energy Div, Daejeon 34132, South Korea 7.Swedish Museum Nat Hist, Dept Geosci, S-11418 Stockholm, Sweden
推荐引用方式 GB/T 7714	Huang, Tzu-Hao,Sun, Xiaole,Somelar, Peeter,et al. Separating Si phases from diagenetically-modified sediments through sequential leaching[J]. CHEMICAL GEOLOGY,2023,637:12.
APA	Huang, Tzu-Hao.,Sun, Xiaole.,Somelar, Peeter.,Kirsimae, Kalle.,Pickering, Rebecca A..,...&Hong, Wei-Li.(2023).Separating Si phases from diagenetically-modified sediments through sequential leaching.CHEMICAL GEOLOGY,637,12.
MLA	Huang, Tzu-Hao,et al."Separating Si phases from diagenetically-modified sediments through sequential leaching".CHEMICAL GEOLOGY 637(2023):12.

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