Organic biomorphs may be better preserved than microorganisms in early Earth sediments
نویسندگان
چکیده
Abstract The Precambrian rock record contains numerous examples of microscopic organic filaments and spheres, commonly interpreted as fossil microorganisms. Microfossils are among the oldest traces life on Earth, making their correct identification crucial to our understanding early evolution. Yet, spherical filamentous objects composed carbon sulfur can form in abiogenic reaction sulfide with compounds. Termed biomorphs, these under geochemical conditions relevant sulfidic environments Earth. Furthermore, they adopt a diversity morphologies that closely mimic number microfossil from record. Here, we tested potential for biomorphs be preserved cherts; i.e., siliceous rocks hosting abundant microbial fossils. We performed experimental silicification along bacterium Thiothrix. show original well through encrustation by nano-colloidal silica, while shapes Thiothrix cells degrade. Sulfur diffuses interior both during silicification, leaving behind empty envelopes. Although composition differs cells, types present similar nitrogen/carbon ratios after silicification. During accumulates envelopes which may promote sulfurization preservation diagenesis. Organic possessing morphological chemical characteristics microfossils thus an important component cherts, challenging
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ژورنال
عنوان ژورنال: Geology
سال: 2021
ISSN: ['0091-7613', '1943-2682']
DOI: https://doi.org/10.1130/g48152.1