Silicon isotope-based assessments of biogenic and dissolved silica content determination in marine sediments
文献类型：期刊论文
| 作者 | Li, Die1,2; Cui, Quanchao7; Liu, Haiyang2; Huang, Tzu-Hao6; Hong, Wei-li5,6; Hu, Bangqi3,4; Huang, Jing1,2; Luo, Min8; Sun, Weidong1,2; Sun, Xiaole2,7 |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2026-03-20 |
| 卷号 | 704页码:18 |
| 关键词 | Si isotopes Biogenic silica contents Alkaline leaching Porewater dissolved Si Marine sediments |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2026.123251 |
| 通讯作者 | Sun, Xiaole(sunxle@mail.sysu.edu.cn) |
| 英文摘要 | Sedimentary biogenic silica (bSi) is a primary sink of oceanic silicon (Si), and its quantification is essential for constraining the marine Si budget. The traditional alkaline leaching method estimates bSi contents by extrapolating a regression of Si leachates at 2, 3, and 5 h, but this approach is biased by lithogenic Si (LSi) dissolution. We analyzed 59 marine sediment samples (0.2 to 57.0 wt% bSi) and used Si isotopes to re-assess this method. Samples with moderate bSi contents (5-20 wt%) show a marked decline in dissolution rates after 3-5 h of leaching. Si isotopes of the leachates reveal that the decline reflects either a shift from dominant bSi to LSi phase or changes in bSi species through time. Sediments with <5 wt% or > 20 wt% bSi display a stable Si dissolution rate throughout 8 h, likely due to unchanged dominant Si phases of lithogenic or biogenic Si. Additionally, we re-assessed the brucite co-precipitation method (MAGIC) for porewater dissolved Si (dSi) recovery. Mg/Si molar ratios <100 yield dSi recovery <90%, resulting in large isotope fractionation. Hence, an Mg/Si ratio of >= 300 is recommended to guarantee full recovery, and H2O2 pretreatment is necessary to eliminate matrix effects induced by high Fe, Mn and DOC concentrations. Our findings imply that the traditional leaching method likely underestimates current bSi contents, especially in clay or/and organic-rich sediments with moderate bSi contents. |
| WOS关键词 | SODIUM-CHLORIDE SOLUTIONS ; LAMINATED DIATOM MATS ; ORGANIC-MATTER ; EARLY DIAGENESIS ; REACTIVE SILICA ; CLAY-MINERALS ; DISSOLUTION KINETICS ; NUTRIENT UTILIZATION ; AMORPHOUS SILICA ; SEA SEDIMENTS |
| 资助项目 | Chinese Academy of Sciences |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001676333000001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/204637]  |
| 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 | Sun, Xiaole |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China 3.Qingdao Marine Sci & Technol Ctr, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 4.Qingdao Inst Marine Geol, Qingdao 266237, Peoples R China 5.Stockholm Univ, Baltic Sea Ctr, S-10691 Stockholm, Sweden 6.Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden 7.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai 519082, Peoples R China 8.Shanghai Ocean Univ, Coll Oceanog & Ecol Sci, Shanghai 201306, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Die,Cui, Quanchao,Liu, Haiyang,et al. Silicon isotope-based assessments of biogenic and dissolved silica content determination in marine sediments[J]. CHEMICAL GEOLOGY,2026,704:18. |
| APA | Li, Die.,Cui, Quanchao.,Liu, Haiyang.,Huang, Tzu-Hao.,Hong, Wei-li.,...&Sun, Xiaole.(2026).Silicon isotope-based assessments of biogenic and dissolved silica content determination in marine sediments.CHEMICAL GEOLOGY,704,18. |
| MLA | Li, Die,et al."Silicon isotope-based assessments of biogenic and dissolved silica content determination in marine sediments".CHEMICAL GEOLOGY 704(2026):18. |
入库方式： OAI收割
来源：海洋研究所
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