Opaline mineralized bodies are produced by many terrestrial plants and accumulate in certain soils and archaeological sites. Analyses of the oxygen isotopic compositions of these so-called phytoliths from stems and leaves ...
The isotopic composition of atmospheric O2 depends on the rates of oxygen cycling in photosynthesis, respiration, photochemical reactions in the stratosphere and on ?17O and ?18O of ocean and leaf water. While most of the ...