Phase-specific nitrogen and carbon isotopes reveal progressive marine oxygenation during the early Great Ordovician Biodiversification Event

This dataset compiles high-resolution chemos tratigraphic records from the Early Ordovician interval of LCD1 drill core on the North Chian Block. It includes carbonate content, total organic carbontal nitrogen, carbon and oxygen isotopes, bulk-rock nitrogen isotopes, and silicatebound nitrogen abundance and isotopic composition,complemented by biogenic silica and Al-normalized trace-elementratios(Cu/Al, Ba/Al, Ni/Al) as nutrient/productivity=related proxies.

本数据集汇编了华北板块（North China Block）LCD1钻孔岩芯早奥陶世（Early Ordovician）层位的高分辨率化学地层学（chemostratigraphy）记录，包含碳酸盐含量、总有机碳、总氮、碳氧同位素、全岩氮同位素，以及硅酸盐结合态氮的丰度与同位素组成；同时辅以生物硅及铝归一化微量元素比值（Cu/Al、Ba/Al、Ni/Al）作为营养与生产力相关代用指标。