| Paleoproductivity and paleoredox conditions during late Pleistocene accumulation of laminated diatom mats in the tropical West Pacific | |
Xiong, Zhifang1; Li, Tiegang1 ; Algeo, Thomas2; Nan, Qingyun1; Zhai, Bin3; Lu, Bo1; Li, TG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China.
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| 2012-12-12 | |
| 发表期刊 | CHEMICAL GEOLOGY
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| ISSN | 0009-2541 |
| 卷号 | 334页码:77-91 |
| 文章类型 | Article |
| 摘要 | Paleoproductivity and paleoredox conditions were reconstructed in a sediment core in the Parece Vela Basin of the eastern Philippine Sea. The core consists of three units, from youngest to oldest: (1) laminated diatom mats (LDM) formed by Ethmodiscus rex during the last Glacial Maximum (similar to 18-28 kyr B.P.), (2) diatomaceous clay (DC), and (3) pelagic clay (PC). Elevated levels of export productivity during LDM deposition are indicated by high values for excess Ba, opal content, and TOC/Ti ratios. Estimated rates of organic carbon degradation (ca. 98%), opal mass accumulation (average 1322 g m(-2) yr(-1)), and corrected organic carbon flux (average 248 g m(-2) yr(-1)) are comparable to high-productivity regions of the modem ocean. The LDM is also characterized by moderate enrichment of redox-sensitive elements such as U. Mo, Cd, and Zn, highly S-34-depleted pyrite sulfur isotopic compositions (indicating bacterial sulfate reduction in a sulfate-unlimited system), and C-S-Fe systematics reflecting limitation of pyrite formation by organic matter rather than reactive Fe availability. These features suggest mainly suboxic conditions in bottom waters but development of sulfidic-anoxic conditions at or close to the sediment-water interface. Association of intensified anoxia with productivity maxima indicates that export production was a more important control on bottom water redox conditions than lateral ventilation. The DC and PC accumulated under oxic to suboxic conditions. Our observations suggest that redox environments during deposition of laminated marine sediments are more complicated and varied than previously thought, and, thus, the use of sediment lamination as an indicator of anoxic bottom water conditions must be approached cautiously. (C) 2012 Elsevier B.V. All rights reserved. |
| 关键词 | Diatom Mats Redox Paleoproductivity Ethmodiscus Rex West Pacific Last Glacial Maximum |
| 学科领域 | Geochemistry & Geophysics |
| DOI | 10.1016/j.chemgeo.2012.09.044 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000313306600007 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/12511 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Li, TG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA 3.Minist Land & Resources, Qingdao Inst Marine Geol, Key Lab Marine Hydrocarbon Resource & Geol, Qingdao 266071, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Xiong, Zhifang,Li, Tiegang,Algeo, Thomas,et al. Paleoproductivity and paleoredox conditions during late Pleistocene accumulation of laminated diatom mats in the tropical West Pacific[J]. CHEMICAL GEOLOGY,2012,334:77-91. |
| APA | Xiong, Zhifang.,Li, Tiegang.,Algeo, Thomas.,Nan, Qingyun.,Zhai, Bin.,...&Li, TG .(2012).Paleoproductivity and paleoredox conditions during late Pleistocene accumulation of laminated diatom mats in the tropical West Pacific.CHEMICAL GEOLOGY,334,77-91. |
| MLA | Xiong, Zhifang,et al."Paleoproductivity and paleoredox conditions during late Pleistocene accumulation of laminated diatom mats in the tropical West Pacific".CHEMICAL GEOLOGY 334(2012):77-91. |
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