Organic geochemistry of Lake Agassiz sediment cores from southwest Ontario and northern Minnesota in 2023

This dataset presents the basic organic geochemistry of Lake Agassiz sediments composing the majority of six long cores from extent lakes in southwestern Ontario and northern Minnesota. Analyses include dry weight density, organic carbon (C) percent (%) , nitrogen (N) percent (%), carbon-13 (13C) (per mil (‰)) and nitrogen-15 (15N) (per mil). These data were used to calculate variable rates of organic carbon accumulation in sediments resulting in part from changes in glacial meltwater inputs to Lake Agassiz. Organic C/N ratios and stable isotope values were also used to infer potential changes in organic matter sources to this lake's sediments over time.

本数据集呈现了阿加西兹湖（Lake Agassiz）沉积物的基础有机地球化学特征，此类沉积物占安大略省西南部与明尼苏达州北部六个长岩芯的主体部分，这些岩芯采集自当地相关湖泊。本次分析涵盖干重密度、有机碳（C）百分含量、总氮（N）百分含量、碳-13（¹³C，单位为千分比（‰））以及氮-15（¹⁵N，单位为千分比）。研究人员依托上述数据计算了沉积物中有机碳的可变堆积速率，该速率的变化部分源于注入阿加西兹湖的冰川融水输入量的改变。此外，有机碳氮比与稳定同位素数值还被用于推断该湖沉积物中有机质来源随时间推移可能发生的变化。