Separating Si phases from diagenetically-modified sediments through sequential leaching

doi:10.1016/j.chemgeo.2023.121681

CORC > 海洋研究所 > 中国科学院海洋研究所 > 深海极端环境与生命过程研究中心

	Separating Si phases from diagenetically-modified sediments through sequential leaching
	Huang, Tzu-Hao 7; Sun, Xiaole 1,6; Somelar, Peeter 5; Kirsimae, Kalle 5; Pickering, Rebecca A.4; Kim, Ji-Hoon 3; Kielman-Schmitt, Melanie 2; Hong, Wei-Li 1,7
刊名	CHEMICAL GEOLOGY
	2023-10-20
卷号	637 页码:12
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2023.121681
通讯作者	Huang, Tzu-Hao(tzu-hao.huang@geo.su.se) ; Hong, Wei-Li(wei-li.hong@geo.su.se)
英文摘要	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.
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
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001068084700001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/181844]
专题	海洋研究所_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, Balt Sea Ctr, Stockholm S-10691, Sweden 2.Swedish Museum Nat Hist, Dept Geosci, S-11418 Stockholm, Sweden 3.Korea Inst Geosci & Mineral Resources, Marine Geol & Energy Div, Daejeon 34132, South Korea 4.Lund Univ, Dept Geol, S-22362 Lund, Sweden 5.Univ Tartu, Dept Geol, EE-50411 Tartu, Estonia 6.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 7.Stockholm Univ, Dept Geol Sci, S-10691 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.