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Understanding microbialite morphology using a comprehensive suite of three-dimensional analysis tools.

Eric W Stevens1, Dawn Y Sumner, Cara L Harwood

  • 1Department of Geology, University of California, Davis, CA 95616, USA.

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Complex microbialite structures from South Africa reveal distinct growth patterns. Three-dimensional analysis using immersive environments clarified ancient microbial ecology, differentiating support types based on their steep dips and organic inclusions.

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Area of Science:

  • Geology and Paleontology
  • Microbial Ecology
  • Geological Visualization

Background:

  • Microbialites exhibit complex morphologies offering insights into ancient microbial ecosystems.
  • Interpreting these structures is challenging due to their intricate nature and the difficulty in linking morphology to microbial processes.
  • Fenestrate microbialites from the Gamohaan Formation (2.521 Ga) display unique structures: steeply dipping supports with organic inclusions, shallowly dipping supports with diffuse organic inclusions, and draping laminae.

Purpose of the Study:

  • To analyze the three-dimensional structure of fenestrate microbialites to understand their formation.
  • To demonstrate the utility of immersive environments and a personalized workflow for analyzing complex geological data.
  • To differentiate between microbialite support types based on their true dip angles and organic content.

Main Methods:

  • Utilized an immersive environment with head and hand tracking (KeckCAVES) for visualizing virtual microbialite datasets.
  • Developed a custom software suite to create a complete scientific workflow from data input to feature characterization.
  • Performed three-dimensional analysis to determine true dip angles of microbialite structures, contrasting with apparent dips from 2D slabs.

Main Results:

  • Three-dimensional analysis revealed that supports with organic inclusions dip 65°–75°, while those without inclusions dip 85°–90°.
  • A significant 10° dip gap was identified between the two types of supports, indicating fundamentally different growth mechanisms.
  • Apparent dips in 2D slabs (27°–88°) were resolved into distinct, very steep true dips in 3D.

Conclusions:

  • Fenestrate microbialite supports exhibit very steep dips, with a clear distinction between types based on the presence of organic inclusions.
  • The observed differences in dip angles suggest distinct microbial growth processes for different structural components.
  • Three-dimensional analysis, integrated with a comprehensive workflow, is crucial for accurately interpreting complex microbialite morphologies and their paleoecological significance.