Extinct 244Pu in Ancient Zircons

  title={Extinct 244Pu in Ancient Zircons},
  author={Grenville Turner and T. Mark Harrison and Greg Holland and Stephen J. Mojzsis and Jamie D. Gilmour},
  pages={89 - 91}
We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of 244Pu in individual 4.1- to 4.2-billion-year-old zircons from the Jack Hills region of Western Australia. Because of its short half-life, 82 million years, 244Pu was extinct within 600 million years of Earth's formation. Detrital zircons are the only known relics to have survived from this period, and a study of their Pu geochemistry will allow us to date ancient metamorphic events and determine the… 
Xenon isotopes in the MORB source, not distinctive of early global degassing
Although fissiogenic Xe in mid‐ocean ridge basalt (MORB) has long been used inferred to infer an early (>4 Ga) catastrophic mantle degassing, decomposition of the analyzed gas in terms of its
The Hadean Crust: Evidence from >4 Ga Zircons
A review of continental growth models leaves open the possibilities that Earth during the Hadean Eon (∼4.5–4.0 Ga) was characterized by massive early crust or essentially none at all. Without support
Hadean Jack Hills Zircon Geochemistry
Geochemical analysis of zircons older than 4 billion years, found in Early Archean metasediments at Jack Hills, Western Australia, provide insights into the nature of Hadean Earth. Oxygen isotopes
Constraints on Hadean zircon protoliths from oxygen isotopes, Ti‐thermometry, and rare earth elements
We report zircon oxygen isotope ratios and reconnaissance Ti‐in‐zircon concentrations, guided by cathodoluminescence image studies, for detrital zircons up to 4.34 Ga from the Narryer Gneiss Complex
Zircon Thermometer Reveals Minimum Melting Conditions on Earliest Earth
The temperatures substantiate the existence of wet, minimum-melting conditions within 200 million years of solar system formation and suggest that Earth had settled into a pattern of crust formation, erosion, and sediment recycling as early as 4.35 Ga.
CO2 fluid inclusions in Jack Hills zircons
The discovery of Hadean to Paleoarchean zircons in a metaconglomerate from Jack Hills, Western Australia, has catalyzed intensive study of these zircons and their mineral inclusions, as they
From the Hadean to the Himalaya: 4.4 Ga of felsic terrestrial magmatism
Abstract Detrital zircons as old as nearly 4.4 Ga offer insights into the earliest moments of Earth history. Results of geochemical investigations of these grains have been interpreted to indicate
The iodine–plutonium–xenon age of the Moon–Earth system revisited
  • G. Avice, B. Marty
  • Environmental Science, Geology
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2014
Iodine–plutonium–xenon isotope systematics have been used to re-evaluate time constraints on the early evolution of the Earth–atmosphere system and, by inference, on the Moon-forming event. Two


Plutonium-fission xenon found in Earth's mantle
Data from mid-ocean ridge basalt glasses indicate that the short-lived radionuclide plutonium-244 that was present during an early stage of the development of the solar system is responsible for
Oxygen-isotope evidence from ancient zircons for liquid water at the Earth's surface 4,300 Myr ago
In situ U–Pb and oxygen isotope results for detrital zircons found within 3-Gyr-old quartzitic rocks in the Murchison District of Western Australia are consistent with the presence of a hydrosphere interacting with the crust by 4,300 Myr ago and are postulated to form from magmas containing a significant component of re-worked continental crust.
Ion microprobe identification of 4,100–4,200 Myr-old terrestrial zircons
We report here the existence of detrital zircons from Western Australia which are far older than any known terrestrial rocks. They are from quartzites at Mt Narryer (Fig. 1), a locality which has
Constraints on evolution of Earth's mantle from rare gas systematics
Analyses of the isotopic composition of He, Ar and Xe in a suite of glasses from the mid-ocean ridges and from the island of Hawaii show that the Hawaiian samples have systematically lower 4He/3He,
Abundances of Actinides and Short-lived Nonactinides in the Interstellar Medium: Diverse Supernova Sources for the r-Processes
Abundances of 244Pu,235U,238U, and 232Th in the early solar system are about those expected for uniform production over most of galactic history. The inferred abundance of 182Hf is also compatible
Extinct radioactivities: a three-phase mixing model
A new class of models is advanced for interpreting the relationship of radioactive abundances in the early solar system to their average concentration in the interstellar medium. The model assumes