Microbial assemblages in biofilms form sticky films that influence sediment deposition Microbially bound sediments are stabilized and more cohesive Microbialite a rock formed via the influence of microbial trapping binding and precipitation ID: 717030
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Slide1
Microbially
-Induced Sedimentary StructuresSlide2
Microbial assemblages (in biofilms) form sticky films that influence sediment deposition
Microbially
-bound sediments are stabilized and more cohesive
Microbialite
: a rock formed via the influence of microbial trapping, binding, and precipitationSlide3
Trapping, binding by
bacteria
Aragonite precipitation beneath biofilm
Micritization
welds grains together
Sediment Influx
Early cementation critical for growth of
microbialitesSlide4
Stromatolite
: laminated
organosedimentary
structure created by trapping and binding of sediment by a microbial
biofilmSlide5
Thrombolite
: clotted, non-laminated
microbialite
Require lower sediment influx, form in
subtidal
environmentsSlide6
Microbialites
in
siliciclastics
(e.g
., “wrinkle structures”) do not form structures with relief above seafloor, likely due to lack of carbonate precipitation
Wrinkle Structures, Lower Cambrian