GEOCHEMISTRY ARTICLES – December 2022

نویسندگان

چکیده

Organic compounds are widely used for paleoclimatic and paleoenvironmental reconstructions. Bulk organic proxies, however, more complicated to interpret due the multiple causes of variation in climatic environmental conditions degree diagenetic alteration. As labile compounds, rich easily degradable function generally richer heteroatoms such as oxygen nitrogen, decompose, remaining matter becomes progressively refractory carbon its content increases. Thus, a peat deposit composed almost entirely matter, total (TOC) is expected increase with time depth, which could mask signal. We propose simple model sediments remove decomposition signal based on logarithmic fitted partial dataset where main parameter. The subtraction obtained raw data (i.e., measured data) leads “residual” data. discuss influence different parameters (water table vegetation, microbial community) their possible link variations. This method tested bulk elemental isotopic from new core Adamawa Plateau (North-East Cameroon) covering nearly 10 ka cal BP. Comparison Rock-Eval® highlights similar variations between Hydrogen Index residual TOC variations, supporting interpretation TOC. Our approach allows extract information decomposition-prone proxies can be generalized deposits plays major role controlling

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ژورنال

عنوان ژورنال: Organic Geochemistry

سال: 2023

ISSN: ['1873-5290', '0146-6380']

DOI: https://doi.org/10.1016/j.orggeochem.2023.104584