The relationship between sedimentary organic carbon isotopic composition and organic biomarker compound concentration

陆源沉积物 沉积有机质 成岩作用 有机质 地质学 总有机碳 沉积岩 碳同位素 有机地球化学 间冰期 生物标志物 冰期 海洋学 地球化学 环境化学 古生物学 化学 烃源岩 构造盆地 有机化学 生物化学
作者
John P. Jasper,Robert B. Gagosian
出处
期刊:Geochimica et Cosmochimica Acta [Elsevier]
卷期号:57 (1): 167-186 被引量:45
标识
DOI:10.1016/0016-7037(93)90477-e
摘要

A study of organic biomarker compounds which could serve as tracers of terrigenous and marine sedimentary organic matter sources was performed on samples from a 208.7 m hydraulic piston core hole (DSDP Hole 619) from the hemipelagic Pigmy Basin in the northern Gulf of Mexico. Organic carbon-normalized concentrations of total long chain (C37–C39) alkenones and some individual C27–C29 desmethyl sterols were determined to be useful proportional indicators (tracers) of preserved marine and terrigenous organic carbon, respectively. The alkenones, whose only known source is marine phytoplankton of the class Prymnesiophyceae, generally occurred in higher concentrations in interglacial isotope stages 1 and 5a-b than in the intervening glacial stages. Sterols (C27-C29), apparently of a dominantly terrigenous origin, occurred in lower concentrations during interglacial stages than in glacial stages. Tracers of both terrigenous and marine organic matter appear to be affected by the differential diagenetic alteration of the biomarker/Corg ratios, as indicated by a simple, first-order kinetic model. The lack of any desmethylor 4a-methylsterol which is linearly related to the proportion of marine sedimentary organic matter (as scaled by δ13Corg) indicates that either (1) sedimentary diagenesis has obscured the biomarker/Corg vs. δ13Corg record (2) phytoplanktonic assemblage changes caused variations in the biomarker/Corg ratio of the primary input.
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