Chemical and isotope composition of carbonate nodules and host bottom sediments from Core DM9-666, Gulf of California

Results of mineralogical and isotopic analyzes of sulfur and carbon in carbonate nodules and host bottom sediments and results of 14C measurement in carbonate nodules are reported. It is proved that the carbonate nodules formed 11-22 thousand years ago in anaerobic diagenesis of bottom sediments rich in organic matter. Isotopic light metabolic carbon dioxide was a source of carbonate for nodules. It formed during microbial degradation of organic matter of bottom sediments.

本数据集报道了碳酸盐结核及其赋存底沉积物中硫、碳的矿物学与同位素分析结果，以及碳酸盐结核的14C测年结果。研究证实，该类碳酸盐结核形成于距今1.1万至2.2万年前，发育于富有机质底沉积物的厌氧成岩作用过程中。结核的碳酸盐物质来源为同位素轻质代谢成因二氧化碳，该气体由底沉积物中有机质的微生物降解作用产生。