Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada

  title={Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada},
  author={Samuel A. Bowring and Ian S. Williams},
  journal={Contributions to Mineralogy and Petrology},
Abstract Ancient crustal rocks provide the only direct evidence for the processes and products of early Earth differentiation. SHRIMP zircon U-Th-Pb dating has identified, amongst the Acasta gneisses of the western Slave Province, Canada, two metatonalites and a metagranodiorite that have igneous ages of 4002 ± 4, 4012 ± 6 and 4031 ± 3 Ga respectively. These are the first identified Priscoan terrestrial rocks. A record of metamorphic events at ∼3.75, ∼3.6 and ∼1.7 Ga also is preserved. These… 
Oldest zircon xenocryst (4.17 Ga) from the North China Craton
Prior to this work, the existence of crustal materials older than 4.0 Ga has not been reported from the North China Craton (NCC) – one of the few global terrains where crustal rocks from ∼3.8 Ga have
Hadean and Early Archaean High Grade Metamorphic Terrains
The oldest terrestrial minerals identified to date are 4,363 ± 20 Ma-old detrital zircons from Jack Hills, Western Australia (Valley et al. Geology 36:911–912, 2002; Nemchin et al. Earth Planet Sci
3.8 Ga zircons sampled by Neogene ignimbrite eruptions in Central Anatolia: REPLY
Dating the oldest terrestrial rocks and minerals allows constraining the age and formation conditions of the ancient basement of our present-day continents. The oldest terranes, with ages ranging
The oldest rocks on Earth: time constraints and geological controversies
Abstract Ages in the range 3.6–4.0 Ga (billion years) have been reported for the oldest, continental, granitoid orthogeneisses, whose magmatic precursors were probably formed by partial melting or
Detrital Zircons Reveal Evidence of Hadean Crust in the Singhbhum Craton, India
The Singhbhum craton is one of five Archean cratons constituting the Indian subcontinent. It consists of four major lithotectonic units with broadly defined ages from Eoarchean to Neoarchean: the
Zircon U–Pb geochronology from a Paleoproterozoic mafic dyke in the Jiapigou terrane (North China Craton): inferences about formation and evolution of the early crust
The formation and evolution of the ancient crust have long been popular issues in the field of Earth sciences. At present, crustal rocks with ages older than 3.8 Ga are in the form of residual blocks