By Juergen Schieber, Pradip K. Bose, P.G. Eriksson, Santanu Banerjee, Subir Sarkar, Wladyslaw Altermann, Octavian Catuneanu
Drawing on a mixture of contemporary occurrences and sure historic opposite numbers, this atlas is a treatise of mat-related sedimentary good points that one may perhaps count on to determine in historic terrigenous clastic sedimentary successions. through combining glossy and historic examples, the relationship is made to most likely formative techniques and the usage of those positive aspects within the interpretation of old sedimentary rocks.
* the 1st complete compilation of microbial mat features/structures preserved within the sliciclastic rock record
* prime quality, complete colour images totally help the text
* smooth and historic examples attach the formative methods and usage of mat-related positive factors within the interpretation of sedimentary rocks
Read Online or Download Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record (Atlases in Geoscience, Volume 2) PDF
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Additional info for Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record (Atlases in Geoscience, Volume 2)
Initially, the term ‘petee’ was created by Gavish et al. (1985) to contrast biogenically rounded positive structures (petees) from abiogenic sharp-edged triangular ‘tepees’. Reineck et al. (1990) termed domes and folds in soft mats ‘alpha-petees’ and related these structures to subsurficial gas pressure caused by post-burial decay of buried mats. These authors termed gypsum-encrusted stages of initially soft-ground domes and folds in arid climates ‘beta-petees’ and related these still to post-burial decay and gas production of buried mats (Figures 2-4-4A, -4-4B).
Over-riding processes triggered by seasonal cycles of environmental variables are recorded in the vertical section in Figure 2-4-1G. The vertically to diagonally oriented filaments demonstrate active movements of filamentous cyanobacteria, encrustation in life position and death with progressing mineralisation. In situ carbonate precipitates of biogeochemical origin usually reveal heterogeneous distribution patterns within the mat fabrics (Figures 2-4-1A to -4-1G). On the other hand, inorganic carbonate crystallisation from brines is also possible (Schneider and Herrmann, 1980).
Photo: Nora Noffke; modified after photo published in Gerdes et al. (2000a) and Noffke (1998a). (F) Cross-section through surface sediments showing structures resembling lenticular bedding. Mats of different thickness have overgrown ripple crests, flanks and valleys indicating that the microtopography of ripples is of ecologic importance (tip of pencil is 1 cm long). Photo: Nora Noffke. Locality of photos: A, B – Icapui tidal flats, NE Brazil; C to E – Mellum Island, southern North Sea coast (Germany); F – Zarzis beach, southern Tunisia.