Abstract The Tertiary Central Basin (CTB) of Svalbard has been studied extensively in the past because it contains sediments from the Paleocene Eocene Thermal Maximum (PETM). Previous studies have found that a negative carbon isotopic extrusion (CIE) is presents without showing elevated concentration of organic carbon. In this study we extend the record of the CTB with a comprehensive inorganic and organic geochemical data set based on the sediments encountered in the research well BH 10–2008, comprising almost 1100 m of cored sediments. Major and trace elements analyses in combination with mineralogical, carbon isotopic, total organic carbon, and total sulphur measurements were used to reconstruct the depositional environments of the lower Paleocene Basilika Fm. up to the Eocene Aspelintoppen Fm. Several depositional environments have been suggested, which are consistent with the sedimentological interpretation of the respective well section. Back-calculation of the initial organic carbon concentration shows that bacterial sulphate reduction had a major impact on the persevered organic carbon inventory of the lower Basilika Fm. and of the Paleocene/Eocene transition section. Based on organic carbon loss introduced by bacterial decay, as well as measured isotopic composition, we estimate an initial isotopic composition of the evaluated sediments which helps to elucidate on the fate of labile organic matter and explains the unusually low organic carbon inventory of the Paleocene/Eocene transition sediments.

中文翻译：

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斯瓦尔巴第三纪中央盆地古新世和始新世沉积物沉积环境地球化学特征

摘要 斯瓦尔巴第三纪中央盆地 (CTB) 过去曾被广泛研究，因为它包含来自古新世始新世热最大值 (PETM) 的沉积物。先前的研究发现，存在负碳同位素挤出 (CIE)，但没有显示有机碳浓度升高。在这项研究中，我们使用基于 BH 10-2008 研究井中遇到的沉积物的综合无机和有机地球化学数据集扩展了 CTB 的记录，包括近 1100 米的取芯沉积物。主要和微量元素分析与矿物学、碳同位素、总有机碳和总硫测量相结合，用于重建下古新世 Basilika Fm 的沉积环境。直到始新世 Aspelintoppen Fm。已经提出了几种沉积环境，这与相应井段的沉积学解释一致。对初始有机碳浓度的反算表明，细菌硫酸盐的减少对下部 Basilika Fm 的持续有机碳存量有重大影响。和古新世/始新世过渡段。基于细菌衰变引入的有机碳损失以及测量的同位素组成，我们估计了评估沉积物的初始同位素组成，这有助于阐明不稳定有机物的归宿，并解释古新世的有机碳存量异常低/始新世过渡沉积物。对初始有机碳浓度的反算表明，细菌硫酸盐的减少对下部 Basilika Fm 的持续有机碳存量有重大影响。和古新世/始新世过渡段。基于细菌衰变引入的有机碳损失以及测量的同位素组成，我们估计了评估沉积物的初始同位素组成，这有助于阐明不稳定有机物的归宿，并解释古新世的有机碳存量异常低/始新世过渡沉积物。初始有机碳浓度的反算表明，细菌硫酸盐的减少对下部 Basilika Fm 的持续有机碳存量有重大影响。和古新世/始新世过渡段。基于细菌衰变引入的有机碳损失以及测量的同位素组成，我们估计了评估沉积物的初始同位素组成，这有助于阐明不稳定有机物的归宿，并解释古新世的有机碳存量异常低/始新世过渡沉积物。