n-alkane, fatty acid, and lignin phenol-based indices from sediment core PS51/154-11

This dataset includes biomarker indices and data used to calculate the mass accumulation rate of high molecular weight fatty acids in core PS51/154-11, including 1) n-alkane-based indices: the Carbon Preference Index (CPI) and the Sphagnum proxy (C25/(C25+C29) ratio); 2) lignin phenol-based indices: the syringyl phenols to vanillyl phenols ratio (S/V), the cinnamyl phenols to vanillyl phenols ratio (C/V), and the vanillic acid to vanillin ratio (Vd/Vl); 3) data for calculating the mass accumulation rate of high molecular weight fatty acids (C24:0+C26:0+C28:0+C30:0, HMW fatty acid MAR), which includes sedimentation rate, dry bulk density, and high molecular weight fatty acid content. N-alkanes and fatty acids were extracted with a mixture of dichloromethane (DCM) + methanol (v/v = 9:1) and analyzed with an Agilent 7890A gas chromatograph equipped with a flame ionization detector (GC-FID) using an Agilent J&W DB-5MS column (60 m × 250 μm × 0.25 μm-thick film). Lignin phenols were obtained through the CuO oxidation process, extracted with ethyl acetate, and analyzed with an Agilent Technologies 7820A gas chromatograph coupled with a 5977B MSD mass selective detector (GC-MS) equipped with a 30m × 320 μm × 0.25 μm-thick film column (Trajan SGE PB-1).

本数据集包含用于计算PS51/154-11岩芯中高分子量脂肪酸质量积累速率的生物标志物指标及配套数据，具体包括：1）基于正构烷烃的指标：碳优势指数（Carbon Preference Index, CPI）以及泥炭藓代用指标（Sphagnum proxy，C25/(C25+C29)比值）；2）基于木质素酚类的指标：丁香基酚类与香草基酚类比值（S/V）、肉桂基酚类与香草基酚类比值（C/V）以及香草酸与香兰素比值（Vd/Vl）；3）用于计算C24:0、C26:0、C28:0、C30:0四类高分子量脂肪酸质量积累速率（HMW脂肪酸MAR）的相关数据，涵盖沉积速率、干容重与高分子量脂肪酸含量。正构烷烃与脂肪酸采用二氯甲烷（dichloromethane, DCM）+甲醇（体积比9:1）混合溶剂萃取，使用搭载火焰离子化检测器（GC-FID）的安捷伦7890A气相色谱仪，搭配安捷伦J&W DB-5MS色谱柱（60 m × 250 μm × 0.25 μm厚膜）完成分析。木质素酚类通过氧化铜氧化法制备，以乙酸乙酯萃取后，采用安捷伦科技7820A气相色谱仪耦合5977B MSD质量选择检测器（GC-MS），搭配30 m × 320 μm × 0.25 μm厚膜的Trajan SGE PB-1色谱柱进行分析。