Estimation of authigenic alteration of biogenic and reactive silica in Pearl River estuarine sediments using wet-chemical digestion methods |
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| Authors: | Ya-Chao Qin Huan-Xin Weng Haiyan Jin Jianyu Chen and Rong-Xiang Tian |
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| Institution: | (1) Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao, 266071, People’s Republic of China;(2) Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, People’s Republic of China;(3) Key Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, SOA, Hangzhou, 310012, People’s Republic of China |
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| Abstract: | The extent of authigenic alteration of biogenic and reactive silica in Pearl River estuarine sediments has been estimated
using wet-chemical digestion methods. Results show relatively constant distributions of biogenic and reactive Si horizontally
and vertically. Based on three core measurements, the biogenic and total reactive Si average 77.91 and 264.77 μmol Si g−1, respectively. Their extents of authigenic alteration are correspondingly estimated as ~55.6 and ~70.6%. The average biogenic
Si accumulation rate is calculated as 1.91 × 109 mol Si year−1, which translates into storage of ~7.15% of the annual riverine dissolved silica input. By contrast, the total reactive Si
accumulation rate is as high as 6.49 × 109 mol Si year−1, improving annual riverine silicic acid storage to ~24.19%. Detailed investigation is required for a good understanding of
early diagenetic process of biogenic and reactive silica in this subtropical area. |
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