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Facies

, Volume 19, Issue 1, pp 259–269 | Cite as

Geometry and internal structure of subsurface lower Cambrian reefs of the Siberian platform: Osinsky horizon (Aldanian), Nepsko-Botoubinsky anteclise, southern Central Siberia

  • Vitaly G. Kuznetsov
  • Olga V. Postnikova
Article

Summary

Lower Cambrian buildups in the subsurface of the Nepsko-Botuobinsky anteclise in southern Central Siberia were investigated with respect to the geometry of the reefs and their biotic and lithological composition. The buildups of the Osinsky horizon are characterized by an abundance of non-skeletal and skeletal algae (Epiphyton, Renalcis, Markovella et. al.) which acted as binders, encrusters and probably also as framebuilders. Archaeocyathids are important elements in the climax communities of some successions. The buildup rocks are limestones and dolomites (algal boundstones, archaeocyathid/algal boundstones, algal wackestones and mudstones). Coarsegrained reef detritus is missing.

The buildups grew in buildup complexes on the slopes of an extended platform (central Nepsko-Botuobinsky anteclise) and on shoals in the platform area. Downslope buildups exhibit an asymmetrical geometry; the buildups are bordered by thin basinal sediments on the exterior margin and thicker platform sediments on the platform margin. Two subtypes (A 1, very-pronounced buildups; A 2, less pronounced buildups) are distinguished by their thickness, slope gradients, prevailing biota and rock types. Symmetrical buildups (type B) were formed in platform settings, and are characterized by a stable ratio of the thickness of buildups to the thickness of the surrounding sediments.

The buildups of the Osinsky horizon are similar to other Lower Cambrian reefs with regard to biotic composition, rock types and the lack of coarse-grained reef detritus. Other criteria show striking differences: the elevation above the sea bottom is greater, the buildups have extremely gentle slope angles (less than 1°), and differentiation in the geometry of the buildups is more distinct.

Keywords

Facies analysis Reefs Buildups Algae Archaeocyathids Siberian Platform Lower Cambrian 

Geometrie und Internbau der unterkambrischen Riffe im Untergrund der Sibirischen Plattform (Osinsky Horizont, Aldan; südliches Zentralsibirien)

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Copyright information

© Institut für Paläontologie, Universität Erlangen 1988

Authors and Affiliations

  • Vitaly G. Kuznetsov
    • 1
  • Olga V. Postnikova
    • 1
  1. 1.Moskovskii institut neftekhimicheskoi i gazovoi promyshlennosti im. GubkinaMoskvaSSSR

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