Basal Induan (Early Triassic) giant sponge-microbial build-ups in Armenia: microfacies analyses and carbon isotope studies.
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2016
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info:eu-repo/semantics/altIdentifier/doi/10.1130/abs/2016am-281363
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Evelyn Friesenbichler et al., « Basal Induan (Early Triassic) giant sponge-microbial build-ups in Armenia: microfacies analyses and carbon isotope studies. », Serveur académique Lausannois, ID : 10.1130/abs/2016am-281363
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The Transcaucasia area (central Armenia) offers the opportunity to study a distinctive sponge-microbial community development in the aftermath of the end-Permian mass extinction (Permian-Triassic Boundary sponge-microbialites PTBSM): isolated communities started to built vertical edifices up to 12 m high during Griesbachian times (Induan, Lower Triassic), and show two growth phases within a pelagic carbonate ramp. The first sponge-microbial build-ups, which are rich in sponge spicules, co-occur with impressive calcium carbonate crystal fans (CCFs) that vary in thickness between 5 cm to 2 m. A comparison between the δ13C values from the PTBSM that formed during the first growth phase and the surrounding sediment revealed a remarkable differences: the δ13Cmicrobialite values are up to 2.3‰ more positive than the corresponding δ13Csediment values.