Neoarchean Carbonates - Clues to Early Life and Early Ocean Chemistry Leader:
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Neoarchean carbonate-associated sulfate records positive Δ³³S anomalies.
Mass-independent fractionation of sulfur isotopes (reported as Δ(33)S) recorded in Archean sedimentary rocks helps to constrain the composition of Earth's early atmosphere and the timing of the rise of oxygen ~2.4 billion years ago. Although current hypotheses predict uniformly negative Δ(33)S for Archean seawater sulfate, this remains untested through the vast majority of Archean time. We appl...
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One of the great problems in the history of Earth’s climate is how to reconcile evidence for liquid water and habitable climates on early Earth with the Faint Young Sun predicted from stellar evolution models. Possible solutions include a wide range of atmospheric and oceanic chemistries, with large uncertainties in boundary conditions for the evolution and diversification of life and the role ...
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A 26-year-old married female presented with a complaint of recurrent multiple ulcerative lesions on her body. After complete history and physical examination, a diagnosis of dermatitis artefacta was made. Dermatitis artefacta remains undiagnosed for quite some time because of its atypical skin changes, diverse methods used for producing skin lesions, lack of awareness about the disorder on the ...
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When carbon dioxide dissolves in oceans it forms carbonic acid which triggers chemical reactions that reduce the pH (increasing the acidity) while reducing the availability of buffers such as carbonates. Most water dwelling organisms particularly fish depend on their chemoreceptors to detect the odor of food, finding mates for reproduction, predators/ prey recognition, homing clues etc. When ch...
متن کاملMicrobial Behaviour and Calcite Precipitation as Controls on Neoarchean Microbialite Morphology
The early evolution and diversification of life can be constrained by analysing the morphology of well preserved microbial communities. However, stromatolite morphology is a complex function of biological, chemical, and physical processes. Thus, to constrain microbial behaviour, the influences of various processes need to be carefully extracted. In some Neoarchean microbialites, physical and ch...
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تاریخ انتشار 2002