Historical Development of Zircon Geochronology

Davis, Donald W.; Williams, Ian S.; Krogh, T. E.

doi:10.2113/0530145

Cited by 165 publications

(72 citation statements)

References 220 publications

(189 reference statements)

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“…Second, geochemical research, initially focused on iron (Fe) formation, suggested that early evolution took place beneath an oxygen-free atmosphere (Holland 1962, Cloud 1968. And, critically important, advances in mass spectrometry made it possible to obtain radiometric age constraints from sedimentary successions that preserved records of biological and environmental history; this enabled scientists to establish a timeline of Earth's early development (Davis et al 2003).…”

Section: Introductionmentioning

confidence: 99%

The Ecological Physiology of Earth's Second Oxygen Revolution

Sperling

Knoll

Girguis

2015

Annu. Rev. Ecol. Evol. Syst.

134

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Living animals display a variety of morphological, physiological, and biochemical characters that enable them to live in low-oxygen environments. These features and the organisms that have evolved them are distributed in a regular pattern across dioxygen (O 2 ) gradients associated with modern oxygen minimum zones. This distribution provides a template for interpreting the stratigraphic covariance between inferred Ediacaran-Cambrian oxygenation and early animal diversification. Although Cambrian oxygen must have reached 10--20% of modern levels, sufficient to support the animal diversity recorded by fossils, it may not have been much higher than this.Today's levels may have been approached only later in the Paleozoic Era. Nonetheless, Ediacaran-Cambrian oxygenation may have pushed surface environments across the low, but critical, physiological thresholds required for large, active animals, especially carnivores. Continued focus on the quantification of the partial pressure of oxygen (pO 2 ) in the Proterozoic will provide the definitive tests of oxygen-based coevolutionary hypotheses.

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Section: Introductionmentioning

confidence: 99%

The Ecological Physiology of Earth's Second Oxygen Revolution

Sperling

Knoll

Girguis

2015

Annu. Rev. Ecol. Evol. Syst.

134

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“…These trace elements provide information on the petrogenetic processes associated with zircon growth (Hoskin and Schaltegger 2003) and facilitate geochronological dating via a number of different radiometric decay systems (Davis et al 2003;Dickin 2005;Kinny and Maas 2003;Reiners 2005). As a result, the geochemical analysis of zircon provides constraints on a range of important geological processes.…”

Section: Introductionmentioning

confidence: 99%

Deformation-related microstructures in magmatic zircon and implications for diffusion

Reddy

Timms

Hamilton

et al. 2008

Contrib Mineral Petrol

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“…This level of precision allows using the Pb-Pb method for dating processes that spanned only a few million years: formation of the first solids from the solar nebula, and accretion, differentiation and metamorphism of asteroids. During the same time, the techniques and methodology of terrestrial U-Pb geochronology have been greatly advanced (see recent reviews by Davis et al 2003;Parrish and Noble 2003;Ireland and Williams 2003). These new methods and concepts can be applied to cosmochronology to improve the precision of the ages of meteorites and to get better constrained age interpretations.…”

Section: Introductionmentioning

confidence: 99%

The prospect of high‐precision Pb isotopic dating of meteorites

Amelin

2006

Meteorit & Planetary Scien

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The prospect of high-precision Pb isotopic dating of meteorites Pb/ 206 Pb ratio is the only extant nuclide chronometer with sufficient time resolution for studies of the solar nebula accretion and early asteroidal differentiation and metamorphism. Pb isotopic dates can be used to link the dates obtained from extinct nuclide chronometers to the absolute time scale. The factors that control precision and accuracy of Pb isotopic dates of meteorites: instrumental mass fractionation in isotopic analysis, mass spectrometer sensitivity, removal of common Pb, multi-stage evolution of U-Pb systems, disturbances caused by diffusion, alteration, and shock metamorphism, and uncertainties in decay constants and the natural ratio of the U isotopes are reviewed. The precision of Pb isotopic dates of meteorites attained with currently available techniques and methodology is ±0.5-1.0 Myr in favorable cases. The accuracy of time interval measurements is approximately the same. The most serious limitation on precision and accuracy of Pb isotopic dates is placed by the presence of common Pb of uncertain and/or variable isotopic composition. Improvement in precision and accuracy of Pb isotopic dates would be possible through combined advancement of techniques of isotopic analysis (most importantly, better control over instrumental mass fractionation) and more effective techniques for the removal of common Pb, together with a better understanding of the effects of thermal metamorphism, shock metamorphism, and aqueous alteration on the U-Pb system in meteorites.

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Historical Development of Zircon Geochronology

Cited by 165 publications

References 220 publications

The Ecological Physiology of Earth's Second Oxygen Revolution

The Ecological Physiology of Earth's Second Oxygen Revolution

Deformation-related microstructures in magmatic zircon and implications for diffusion

The prospect of high‐precision Pb isotopic dating of meteorites

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