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Title: Evidence for a composite organic–inorganic fabric of belemnite rostra: Implications for palaeoceanography and palaeoecology

Abstract

Carbonate skeletons of fossil marine organisms are widely used to reconstruct palaeoceanographic parameters. Specifically, the geochemistry of Jurassic and Cretaceous belemnite rostra is traditionally interpreted to represent near sea-surface seawater properties. More recently, an increasing number of workers, have reported significant scatter in geochemical data (e.g., δ 18O, δ 13C, element/Ca ratio) when comparing rostra from the same stratigraphic level or within a single belemnite rostrum. This scatter is not explained by differential diagenetic overprint alone. Here we report petrographic evidence on the primary ultrastructure of rostra of Megateuthis (Middle Jurassic) and Belemnitella and Gonioteuthis (Late Cretaceous). The biogenic ultrastructure consists of a filigree framework of triaxial branches and tetrahedrons of variable size forming a honeycomb-like network. Data presented here suggest that these rostra yielded as much as 50 to 90% primary pore space. On the level of a working hypothesis – and in analogy with modern cephalopods – we propose that the pore space was formerly filled with body fluid and/or organic compounds during the life time of these organisms. Intra-rostral porosity was post mortem occluded by earliest diagenetic isopachous calcite cements of a non-biogenic origin. These may have been precipitated due to increased alkalinity related to the decaymore » of organic matter. If this holds true, then the resulting fabric represents a composite biogenic/abiogenic structure. In order to optically separate the two calcite phases forming a single calcite fibre, we employed a wide range of state-of-the-art analytical tools to thin sections and ultra-thin sections of well-preserved specimens. Finally, pending a verification of these well-supported ultrastructural data by means of high-resolution geochemical analyses from biogenic and abiogenic phases, we suggest that these findings have significance for those using belemnite rostra as archives of their palaeoenvironment.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [1]
  1. Ruhr-Univ. Bochum, Bochum (Germany)
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. The Univ. of Edinburgh, Edinburgh (United Kingdom)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1371749
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Sedimentary Geology
Additional Journal Information:
Journal Volume: 341; Journal Issue: C; Journal ID: ISSN 0037-0738
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; belemnite; ultrastructure; carbonate archive; diagenesis; Jurassic-Cretaceous

Citation Formats

Hoffmann, Rene, Richter, D. K., Neuser, R. D., Jons, N., Linzmeier, B. J., Lemanis, R. E., Fusseis, F., Xiao, X., and Immenhauser, A. Evidence for a composite organic–inorganic fabric of belemnite rostra: Implications for palaeoceanography and palaeoecology. United States: N. p., 2016. Web. doi:10.1016/j.sedgeo.2016.06.001.
Hoffmann, Rene, Richter, D. K., Neuser, R. D., Jons, N., Linzmeier, B. J., Lemanis, R. E., Fusseis, F., Xiao, X., & Immenhauser, A. Evidence for a composite organic–inorganic fabric of belemnite rostra: Implications for palaeoceanography and palaeoecology. United States. doi:10.1016/j.sedgeo.2016.06.001.
Hoffmann, Rene, Richter, D. K., Neuser, R. D., Jons, N., Linzmeier, B. J., Lemanis, R. E., Fusseis, F., Xiao, X., and Immenhauser, A. Sat . "Evidence for a composite organic–inorganic fabric of belemnite rostra: Implications for palaeoceanography and palaeoecology". United States. doi:10.1016/j.sedgeo.2016.06.001. https://www.osti.gov/servlets/purl/1371749.
@article{osti_1371749,
title = {Evidence for a composite organic–inorganic fabric of belemnite rostra: Implications for palaeoceanography and palaeoecology},
author = {Hoffmann, Rene and Richter, D. K. and Neuser, R. D. and Jons, N. and Linzmeier, B. J. and Lemanis, R. E. and Fusseis, F. and Xiao, X. and Immenhauser, A.},
abstractNote = {Carbonate skeletons of fossil marine organisms are widely used to reconstruct palaeoceanographic parameters. Specifically, the geochemistry of Jurassic and Cretaceous belemnite rostra is traditionally interpreted to represent near sea-surface seawater properties. More recently, an increasing number of workers, have reported significant scatter in geochemical data (e.g., δ18O, δ13C, element/Ca ratio) when comparing rostra from the same stratigraphic level or within a single belemnite rostrum. This scatter is not explained by differential diagenetic overprint alone. Here we report petrographic evidence on the primary ultrastructure of rostra of Megateuthis (Middle Jurassic) and Belemnitella and Gonioteuthis (Late Cretaceous). The biogenic ultrastructure consists of a filigree framework of triaxial branches and tetrahedrons of variable size forming a honeycomb-like network. Data presented here suggest that these rostra yielded as much as 50 to 90% primary pore space. On the level of a working hypothesis – and in analogy with modern cephalopods – we propose that the pore space was formerly filled with body fluid and/or organic compounds during the life time of these organisms. Intra-rostral porosity was post mortem occluded by earliest diagenetic isopachous calcite cements of a non-biogenic origin. These may have been precipitated due to increased alkalinity related to the decay of organic matter. If this holds true, then the resulting fabric represents a composite biogenic/abiogenic structure. In order to optically separate the two calcite phases forming a single calcite fibre, we employed a wide range of state-of-the-art analytical tools to thin sections and ultra-thin sections of well-preserved specimens. Finally, pending a verification of these well-supported ultrastructural data by means of high-resolution geochemical analyses from biogenic and abiogenic phases, we suggest that these findings have significance for those using belemnite rostra as archives of their palaeoenvironment.},
doi = {10.1016/j.sedgeo.2016.06.001},
journal = {Sedimentary Geology},
number = C,
volume = 341,
place = {United States},
year = {Sat Jun 11 00:00:00 EDT 2016},
month = {Sat Jun 11 00:00:00 EDT 2016}
}

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