NDLI: Molar tooth structures: Formation and specificity of carbonate diagenesis in the Late Precambrian, Middle Riphean Sukhaya Tunguska Formation of the Turukhansk Uplift, Siberia

Content Provider	Springer Nature Link
Author	Petrov, P. Yu.
Copyright Year	2011
Abstract	A new way of formation of the problematic Molar Tooth (MT) structures, which, along with stromatolites, could be considered as a “visiting card” of the Riphean, was examined on the example of carbonate sediments of the Riphean Sukhaya Tunguska Formation from the Turukhansk Uplift, Siberia. These structures were formed due to the consequent replacement of oozy constituent of carbonate sediments with calcitic microsparite in the course of diagenesis with substantial shift of the dynamic equilibrium toward the solution in the sediment—porous solution—microsparite system. An excess of soluble magnesium significantly hampering precipitation of crystal cores of the future calcitic microsparite could be one of the possible causes of the shift. It is suggested that magnesium mole fraction of the porous solutions was related to the early dissolution of the metastable high-Mg calcite of the silty sediment brought from the areas of active stromatolite formation. The facies occurrence of the MT-structures indicates that they occurred in descending trails of the most productive zones of carbonate platforms tapering toward the basin. The synchronism of stratigraphic trends of the MT-structures and stromatolites in the Precambrian resulted from the evolution of carbonate-productive microbe-mineral systems which were the immediate suppliers of fine-grained carbonate sediment into external zones of carbonate platforms.
Starting Page	247
Ending Page	267
Page Count	21
File Format	PDF
ISSN	08695938
Journal	Stratigraphy and Geological Correlation
Volume Number	19
Issue Number	3
e-ISSN	15556263
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-06-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	microsparite molar tooth Proterozoic Riphean stromatolites Geophysics/Geodesy Sedimentology Historical Geology Archaeology Structural Geology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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