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 certain old opposite numbers, this atlas is a treatise of mat-related sedimentary good points that one could count on to work out in historical terrigenous clastic sedimentary successions. by way of combining sleek and historical examples, the relationship is made to most likely formative methods and the usage of those positive aspects within the interpretation of historical sedimentary rocks.
* the 1st complete compilation of microbial mat features/structures preserved within the sliciclastic rock record
* top of the range, complete colour photos totally aid the text
* sleek and old examples attach the formative procedures and usage of mat-related positive aspects within the interpretation of sedimentary rocks
Read or Download Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record, Volume 2 PDF
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Extra info for Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record, Volume 2
Clays transported through the grain fabric by uprising or circulating groundwater are trapped on grain surfaces by mucilage coatings and may later form sericite. Alternatively, biogeochemical processes within the microbial mat itself (Krumbein and Werner, 1983) may allow clay accumulation. Forming in inherently permeable sandstones, syngenetic signatures, such as lamina-specific carbonate cementation, are easily overprinted by subsequent diagenetic processes. Certain textural features, however, like ‘floating’ terrigenous grains in a carbonate matrix, suggest precompactional and possibly syngenetic carbonate formation (Garlick, 1988; Schieber, 1998).
I) Surface of a desiccated and cracked mat, with shrinkage exposing the clay mineral substrate marked by orthogonal cracks, while the overlying mat shows unusual crack morphologies, incomplete fissures, folds and upcurled margins. Abandoned salina basin (lens cap = 5 cm in diameter). -E. Reineck. Locality of photos: A – Mellum Island, southern North Sea coast (Germany); B to E – saltworks, Bretagne coast (France); F, G – Bahar Alouane, southern Tunisia; H – Sabkha Bou Jemel, southern Tunisia; I – saltworks, Lanzarote, Canary Islands (Spain).
1997), micritic cement between terrigenous grains, and highly lamina-specific carbonate cementation within laminated sandstones. Another metabolic effect would be the formation of very early diagenetic dolomite (Gebelein and Hoffman, 1973) from high Mg concentrations in sheaths of living filamentous cyanobacteria. If mat-internal carbonate precipitation is voluminous enough, detrital grains of quartz and mica may be encased in a carbonate matrix and form ‘floating grains’ upon lithification. In ancient examples, a ‘coated grain’ fabric denotes sand- and silt-sized grains that are surrounded by fine-grained sericitic material (Bouougri and Porada, 2002; Draganits and Noffke, 2004).