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Decaying of Artemia salina in clay colloids: 14-month experimental formation of subfossils

Published online by Cambridge University Press:  04 July 2016

Elena B. Naimark ,
Maria A. Kalinina ,
Alexander V. Shokurov ,
Alexander V. Markov  and
Natalia M. Boeva
Elena B. Naimark
Affiliation:
A.A. Borissyak Paleontological Institute of Russian Academy of Sciences, Moscow, Profsouznaya, 123, 117647Russia, 〈naimark@paleo.ru〉
Maria A. Kalinina
Affiliation:
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow, Leninsky prosp. 31, 119071Russia, 〈kalinina@phyche.ac.ru〉
Alexander V. Shokurov
Affiliation:
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Moscow, Leninsky prosp. 31, 119071Russia, 〈kalinina@phyche.ac.ru〉
Alexander V. Markov
Affiliation:
A.A. Borissyak Paleontological Institute of Russian Academy of Sciences, Moscow, Profsouznaya, 123, 117647Russia, 〈naimark@paleo.ru〉 Lomonosov Moscow State University, Biological Department, Vorobievy Gory, 1, Moscow, 119991, Russia, 〈markov_a@inbox.ru〉
Natalia M. Boeva
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetny per. 35, Moscow, 119017Russia, 〈boeva@mail.ru〉
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Abstract

The mechanism that guides the formation of exceptionally preserved fossils with soft tissues variously displayed is a paramount challenge to paleontology. The key question for exceptional preservation is the nature of the slowdown of decay and acceleration of soft tissue mineralization. Here we report the experimental formation of subfossils of the brine shrimp Artemia salina (Crustacea, Branchiopoda), which were produced during 14 months of aging in a kaolinite clay sediment. EDS/SEM elemental analyses showed that the subfossils were preserved as thin clay-organic replicas that displayed fine anatomical details. Decomposition in the clay-colloidal solution established highly heterogeneous acidic conditions, with the lowest pH typically found in the vicinity of the buried organisms, and visually manifested in patchy coloration of the sediment. Elevated acidity is likely what ultimately slowed the decay. An acidic environment increases the rate of clay destruction and, consequently, the diffusion rate decline. As a result, the acidic products quickly accumulate around a buried body; this in turn inhibits bacterial proliferation, accelerates the acidic hydrolysis of clay and, accordingly, the release of tanning and mineralizing agents. The subfossils remained stable under experimental high pressure and temperature. These model subfossils exhibit features that are typical of some Lagerstätten fossils preserved in fine-grained sediments.

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Articles
Information
Journal of Paleontology , Volume 90 , Issue 3 , May 2016 , pp. 472 - 484
Copyright
Copyright © 2016, The Paleontological Society 

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