Secular variability in zircon phosphorus concentrations ...

Phosphorus Variations in Volcanic Sequences Reveal the Linkage ...

Here, we show that the secular variation of P availability in the Mesozoic volcanic rocks were the immediate results of the changes in volcanic intensity ...

6.21 The Geologic History of Seawater

concentration of potassium seems to have ... Holland H. D., Horita J., and Seyfried W. E. (1996) On the secular variations in the composition of Phanerozoic ...

Earth's Great Oxidation Event facilitated by the rise of sedimentary ...

appreciable subaerial landmasses32, a secular increase in the continental phosphorus ... Phosphorus concentrations were either determined spectrophotometrically ...

GSA Today - Geological Society of America

Decreases in zircon εHf have been found to correlate with increases in whole-rock 87Sr/86Sr ratios (Bataille et al., 2017). Increases in oceanic 87Sr/86Sr ...

176 Hf Analysis of Zircon Grains from the Moon and Beyond

Here, we present methods to measure the isotopic composition of Hf of extraterrestrial zircons dated using ID-TIMS U–Pb after chemical abrasion.

Hf, O Isotope and Zr/Hf Records of Plutonic to Volcanic Magma ...

However, the range of their values overlaps with those in this study, suggesting good accuracy for Hf concentrations. Yttrium and phosphorus ...

Phosphorous concentration in iron-rich rocks of the Chilpi Group ...

2009; 3561 ± 11 Ma U-Pb zircon age, Ghosh, 2004, and 3509 ± 14 Ma U-Pb zircon age, Sarkar et al. ... Secular variation of molar P/Fe ratios of ...

Natural blue zircon from Vesuvius | Mineralogy and Petrology

Phosphorus (25.1–49.1 ppm), Ti (1.68–8.10 ppm), and Ta (0.44–4.51 ppm) are present at ppm levels; Sc (0.06–0.16 ppm) and Mg (up to 0.42 ppm) ...

The expansion of land plants during the Late Devonian contributed ...

Sharp increases followed by decreases of phosphorus weathering are meant to represent possible phases of selective phosphorus weathering ...

Natural blue zircon from Vesuvius - Earth-Prints

trace element concentrations, zircon 91500 (Wiedenbeck et al. 1995, 2004) ... Precambrian banded iron formations: secular changes of Ce and. Eu anomalies ...

Natural blue zircon from Vesuvius - Research Collection

trace element concentrations, zircon 91500 (Wiedenbeck et al. 1995 ... Precambrian banded iron formations: secular changes of Ce and. Eu ...

Phosphorus-controlled trace element distribution in zircon revealed ...

The QH zircons with oscillatory zonings display large trace element variations within single grains by a factor up to 13.5, with Y and P ranging from 574 and ...