A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills

  title={A light carbon reservoir recorded in zircon-hosted diamond from the Jack Hills},
  author={Alexander A. Nemchin and Martin J. Whitehouse and Martina Menneken and Thorsten Geisler and R. T. Pidgeon and Simon A. Wilde},
The recent discovery of diamond–graphite inclusions in the Earth’s oldest zircon grains (formed up to 4,252 Myr ago) from the Jack Hills metasediments in Western Australia provides a unique opportunity to investigate Earth’s earliest known carbon reservoir. Here we report ion microprobe analyses of the carbon isotope composition of these diamond–graphite inclusions. The observed δ13CPDB values (expressed using the PeeDee Belemnite standard) range between -5 per mil and -58 per mil with a median… Expand
Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon
Carbon isotopic measurements on graphite inclusions from Jack Hills, Western Australia are reported to be consistent with a biogenic origin and may be evidence that a terrestrial biosphere had emerged by 4.1 Ga, or ∼300 My earlier than has been previously proposed. Expand
Diamonds in Earthʼs oldest zircons from Jack Hills conglomerate, Australia, are contamination
Abstract The earliest period of Earth history is the Hadean era (4600–4000 Myr) but to date no rocks are known to be preserved from this time. However, abundant detrital zircons from the Archean JackExpand
Diamonds through Time
Diamonds form in the upper mantle during episodic events and have been transported to the Earth’s surface from at least the Archean to the Phanerozoic. Small diamonds occur as inclusions in robustExpand
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 isotopesExpand
The role of detrital zircons in Hadean crustal research
Abstract Meso-Archean sedimentary sequences at Mt. Narryer and the Jack Hills of the Narryer Terrane in Western Australia's Yilgarn Craton contain detrital zircon grains with ages as old as 4.37 Ga,Expand
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 theyExpand
Proposed Sources of Hadean Zircons
Any successful geodynamic or environmental model for early Earth must be consistent with ten robust lines of evidence derived from geochemical and petrologic observations of Hadean Jack HillsExpand
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Abstract Zircon has played a critically important role in our understanding of the growth and evolution of the Earth. The U–Pb isotope system as preserved in zircon, more than any other mineral orExpand
What can Hadean detrital zircon really tell us? A critical evaluation of their geochronology with implications for the interpretation of oxygen and hafnium isotopes
Abstract Rare Hadean zircon grains represent the only direct sample of the Earth older than 4.0 Ga. As such, they have tremendous potential to illuminate our knowledge of this period of Earth'sExpand
Recycling of crustal materials through study of ultrahigh-pressure minerals in collisional orogens, ophiolites, and mantle xenoliths: A review
Abstract Newly recognized occurrences of ultrahigh-pressure (UH P ) minerals including diamonds in ultrahigh-temperature (UH T ) felsic granulites of orogenic belts, in chromitites associated withExpand


Hadean diamonds in zircon from Jack Hills, Western Australia
Mineralogical features of the Jack Hills diamonds resemble those of diamonds formed during ultrahigh-pressure metamorphism and imply a relatively thick continental lithosphere and crust–mantle interaction at least 4,250 million years ago. Expand
Stable Isotopes and the Origin of Diamond
Most diamonds form in a relatively narrow depth interval of Earth's subcontinental mantle between 150 and 250 km. From carbon isotope analyses of diamond obtained in the 1970s, it was first proposedExpand
Evidence for Multiple Sources of Diamond from Primitive Chondrites
The data suggest that intrinsic differences must have been inherited by the diamonds at the time of their formation and that the diamonds were distributed heterogeneously in the solar nebula during condensation, and the hypothesis that a distinct nitrogen carrier remains hidden within the diamond cannot be ruled out. Expand
The Earth's oldest known crust: A geochronological and geochemical study of 3900-4200 Ma old detrital zircons from Mt. Narryer and Jack Hills, Western Australia
Detrital zircons with 207Pb/206Pb ages between 3908 and 4270 Ma from the Narryer Gneiss Complex, Western Australia, are the oldest terrestrial minerals found to date. They occur in small proportionsExpand
Strange Diamonds: The Mysterious Origins of Carbonado and Framesite
Polycrystalline aggregates of diamond called carbonado and framesite have excited the attention of scientists because their crystallization histories are thought to depart markedly from establishedExpand
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Zircon is the main mineral in the majority of igneous and metamorphic rocks with Zr as an essential structural constituent. It is a host for significant fractions of the whole-rock abundance of U,Expand
Re-evaluation of the origin and evolution of > 4.2 Ga zircons from the Jack Hills metasedimentary rocks
Abstract New data are presented on internal structures, U–Pb systematics and oxygen isotope compositions of eight detrital zircons with ages greater than 4.2 Ga, from the Jack Hills metasedimentaryExpand
Some perspectives on isotope biosignatures for early life
Abstract The idea of using stable isotope compositions of light elements, particularly of carbon, as a sign of biological activities (biosignatures), both present and past, dates back to the dawn ofExpand
Early-middle archaean crustal evolution deduced from Lu-Hf and U-Pb isotopic studies of single zircon grains
Abstract We report detailed high precision combined single grain U-Pb and Lu-Hf studies of early zircons to obtain more reliable indications of the extent of mantle depletion and crustal recycling inExpand
Hierarchical Earth accretion and the Hadean Eon
  • J. Kramers
  • Geology
  • Journal of the Geological Society
  • 2007
Geochemical traces from the Hadean Eon and terrestrial siderophile and volatile element data are discussed in the light of the standard, or hierarchical, model of planetary accretion, which envisagesExpand