Oxygen isotope composition of natural phosphates from volcanic ash soils of the Great Rift Valley of Africa and east Java, Indonesia

Tracing sources and cycling of phosphorus in Peru Margin sediments using oxygen isotopes in authigenic and detrital phosphates

“…This suggests two distinct sources of detrital phosphates and their mixtures within these sediments. The lower isotopic composition (7.7&) is very close to true volcanic apatites (5.3-7.0&; Mizota et al, 1992;Taylor, 1968). The higher d 18 O P values (11.4-15.4&) are close to equilibrium watertemperature conditions of Andean mountain soils, suggesting formation during weathering and dissolution/ re-precipitation of primary volcanic phosphates (discussed in Section 4.3.1).…”

Oxygen Isotopes for Unraveling Phosphorus Transformations in the Soil-Plant System: A Review

“…A few years after the first experiments of Larsen and his group, Ayliffe et al (1992) and Mizota et al (1992) used 18 O-P at natural abundances and analyzed environmental samples from island phosphate deposits from the Pacific Ocean and volcanic ash soils in Indonesia, respectively. The aim was to study the process of soil phosphate formation (the reaction between P-rich guano and carbonates) and its origin (apatite from rocks vs. biogenic material, such as bones).…”

Oxygen isotope ratios of PO 4 : An inorganic indicator of enzymatic activity and P metabolism and a new biomarker in the search for life

“…O P values in soils have also been attributed to biological activity (37,38). Thus, ␦ Growth curve measuring changes in optical density of microbial cultures measured as absorbance at 600 nM, during growth of Acinetobacter ADP1 on minimal salts medium M9 with Fe-PO 4 sediment as a sole P source at room temperature (Ϸ22°C).…”