Download Atlas of Microbial Mat Features Preserved within the by Juergen Schieber, Pradip K. Bose, P.G. Eriksson, Santanu PDF

By Juergen Schieber, Pradip K. Bose, P.G. Eriksson, Santanu Banerjee, Subir Sarkar, Wladyslaw Altermann, Octavian Catuneanu

Drawing on a mixture of recent occurrences and sure historic opposite numbers, this atlas is a treatise of mat-related sedimentary gains that one may possibly count on to work out in historic terrigenous clastic sedimentary successions. by means of combining smooth and historical examples, the relationship is made to most probably formative methods and the usage of those gains within the interpretation of historic sedimentary rocks.

* the 1st complete compilation of microbial mat features/structures preserved within the sliciclastic rock record
* prime quality, complete colour pictures absolutely aid the text
* smooth and historic examples attach the formative techniques and usage of mat-related positive factors within the interpretation of sedimentary rocks

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Read or Download Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record (Atlases in Geoscience, Volume 2) PDF

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Extra resources for Atlas of Microbial Mat Features Preserved within the Siliciclastic Rock Record (Atlases in Geoscience, Volume 2)

Sample text

C) Similar monolayered soft microbial mat growing on a mixture of subaquatic gypsum and bacterial EPS. Mats are scouring on the slippery substrate due to wind drift, causing folds and tears. Wide tears and exposure of subsoil due to the non-sticking nature of the mat. -E. Reineck. (D) Folds in initially elastic biogenic matrix of microbial mats subsequently gypsum-encrusted. Note rounded (1) and ruptured (2) crests. -E. Reineck; modified after photo published in Reineck et al. (1990). (E) Close-up of elongated petee with ruptured crest.

Gas from decay also may be involved since decay may start already within the uppermost centimetres of a mat (Stal, 1994). Pflüger (1999) mentioned that ‘Kinneyia’-style ripples may reflect gas-trapping beneath flat mats. Yet the aligned bubbles in Figure 2-2-3 mark ripple crests, while Pflüger (1999) indicates that trapped bubbles correspond to the troughs of ‘Kinneyia’. 28 Gerdes Structures Left by Modern Microbial Mats in Their Host Sediments 29 Figure 2-3-2: Jelly-rolls, flip-overs. (A) Healed-up and new spindle-like cracks in jelly mats dominated by coccoids and enriched in slime-agglutinated gypsum (white areas).

Reineck; modified after photo published in Reineck et al. (1990). In Figure 2-4-3, mats are flooded and non-mineralised prior to and during deformation due to gas pressure. Gas diffuses from deeper buried organic deposits or mats toward the surface where cohesive microbial tissues retard the exchange through the mat–water interface. Hummocks may rise up convexly over selective vents (Figures 2-4-3A to -4-3D). Subaerial exposure supports gypsum and halite encrustation, possibly also forced by evaporative pumping (Figures 2-4-3D to -4-3H).

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