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Authigenic anatase within 1 billion-year-old cells.

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|September 30, 2020
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Summary

Precambrian microfossils from Scotland contain authigenic anatase (TiO2). This mineral precipitated within cells, preserving organic material and providing insights into early diagenesis and fossilization processes.

Keywords:
Torridon Groupbiomediated mineralisationcellular contentsexceptional preservationmicrofossilsneoproterozoic life

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Area of Science:

  • Geology
  • Paleontology
  • Mineralogy

Background:

  • The Precambrian Torridon Group in Scotland hosts exceptionally preserved organic-walled microfossils (OWMs).
  • These microfossils are found within phosphatic and clay mineral matrices in the Diabaig and Cailleach Head (CH) Formations.

Purpose of the Study:

  • To identify and characterize minerals within microfossils from the CH Formation.
  • To investigate the role of mineral precipitation in the preservation of Precambrian microfossils.

Main Methods:

  • Electron microscopy was used to identify the mineral phase within microfossil cells.
  • Analysis focused on microfossil taxa including Leiosphaeridia spp., Synsphaeridium spp., and Myxococcoides spp.

Main Results:

  • Anatase (TiO2) crystals were identified within the cells of several microfossil taxa.
  • Intracellular anatase is an authigenic sedimentary phase, indicating in situ precipitation.
  • Anatase precipitation appears to have rapidly entombed and preserved intracellular and cell wall organic material.

Conclusions:

  • This study reports the first instance of in situ precipitated anatase associated with Precambrian microfossils.
  • The rapid mineralization by anatase suggests a significant role in preserving cellular contents.
  • A proposed pathway involves Ti complexation with organic ligands, leading to post-mortem anatase nucleation and preservation.