期刊
JOURNAL OF QUATERNARY SCIENCE
卷 32, 期 7, 页码 989-1007出版社
WILEY
DOI: 10.1002/jqs.2971
关键词
relative sea level; Holocene; stable carbon isotopes; bulk geochemistry; salt marshes; Brittany
资金
- ANR COCORISCO [ANR 2010-CEPL-001-01]
- IGCP Project [639]
Providing a dense network of Holocene relative sea-level (RSL) records still faces some challenges, such as the paucity of microfossil assemblages within some Holocene sedimentary sequences. Recently, the isotopic (delta C-13) and elemental geochemistry [total organic carbon (TOC), total nitrogen (TN) and C/N ratios] of saltmarsh sediments has showed potential for RSL reconstruction. This study presents the results of new delta C-13, TOC and TN measurements obtained on surface sediments of two marshes of the Brittany region (France). Overall, the distribution of delta C-13, TOC, TN and C/N values shows clear dependencies with elevation. Sediments from above and below the high tide level show contrasting TN contents. Clustering analyses identified three elevation-dependent groups, characterized by specific values of delta C-13, TOC and TN. The use of this geochemical reference for RSL reconstruction is tested on a core retrieved from one of the marshes. The sea-level index points obtained plot in good accordance with the microfauna-based RSL positions previously obtained in the region. Some diagenetic losses in TN are observed between modern and Holocene sediments. This does not appear to be harmful to the accuracy of the RSL reconstructions but suggests that C/N ratios may be unreliable palaeoenvironmental proxies in this specific context. Copyright (C) 2017 John Wiley & Sons, Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据