A Window Into Eastern Mediterranean Productivity Conditions Over Three Pliocene Precession‐Forced Climate Cycles
نویسندگان
چکیده
Abstract Here, we explore the importance of export productivity versus anoxia in formation sedimentary layers with enhanced total organic carbon (TOC) content. We use geochemical, sedimentological and micropaleontological records from two SW Sicily outcropping successions, Lido Rossello (LR) Punta di Maiata (PM), over three Early Pliocene precession‐forced climate cycles (4.7–4.6 million years ago [Ma]). Gray marls, deposited during precession minima, show TOC both records. suggest that basin‐wide, low‐oxygenated bottom‐waters, resulting freshwater‐induced stratification minimum, was integral to preserving gray marl TOC. Furthermore, prolonged eastern Mediterranean may have produced a deep chlorophyll maximum (DCM), leading “shade‐flora” dominated productivity. The LR succession displays unique laminated containing These laminations do not occur at specific times cycle or time‐equivalent PM samples. They are likely been by an intermittent dysoxic/anoxic pool LR, caused local depression, which preservation. Consequently, provide rare window into “true” conditions maxima, as matter is typically poorly preserved these period due ventilation. “windows” indicate significantly lower maxima compared previously thought. During periods, comparable modern Mediterranean, spring‐bloom winter/spring deep‐water mixing preceding summer bloom summer‐stratification induced DCM.
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ژورنال
عنوان ژورنال: Paleoceanography and paleoclimatology
سال: 2023
ISSN: ['2572-4517', '2572-4525']
DOI: https://doi.org/10.1029/2022pa004550