New evidence for ~4.45Ga terrestrial crust from zircon xenocrysts in Ordovician ignimbrite in the North Qinling Orogenic Belt, China
MetadataShow full item record
Evidence for the earliest known terrestrial crust comes predominantly from Jack Hills in Western Australia, where hafnium isotopic results from >3.8. Ga detrital zircons indicate crustal precursors as old as ~4.4-4.5. Ga. We present evidence from magmatic cores in >3.9. Ga xenocrystic zircons from a felsic volcanic rock in the North Qinling Orogenic Belt, China, of similar Hf crustal model ages up to 4.45 Ga. These lie on the same Lu/Hf trajectory as the least disturbed Jack Hills and Apollo 14 zircons, therefore providing only the second example of the earliest known generation of continental crust on Earth. In addition, the rims of two zircon grains record later growth at 3.7. Ga and, when combined with the fact that the grains are incorporated in Paleozoic volcanic rocks, imply long-lived crustal residence within the basement of the North China Craton. These results therefore establish the wider distribution and survival of the most ancient crustal material on the Earth and highlight the possibility for the further discovery of ancient crustal remnants.
Showing items related by title, author, creator and subject.
Zircon recycling and crystallization during formation of chromite- and Ni-arsenide ores in the subcontinental lithospheric mantle (Serranía de Ronda, Spain)González-Jiménez, J.; Marchesi, C.; Griffin, W.; Gervilla, F.; Belousova, E.; Garrido, C.; Romero, R.; Talavera, Cristina; Leisen, M.; O'Reilly, S.; Barra, F.; Martin, L. (2017)The ultramafic massifs of the Serranía de Ronda (namely Ronda, Ojén and Carratraca) are portions of Proterozoic (~1.2-1.8Ga) subcontinental lithospheric mantle (SCLM) affected by partial melting and infiltration of melts. ...
Detrital zircon U–Pb age and Hf isotope constrains on the generation and reworking of Precambrian continental crust in the Cathaysia Block, South China: A synthesisLi, X.; Li, Zheng-Xiang; Li, W. (2014)The South China Block, consisting of the Yangtze and the Cathaysia blocks, is one of the largest Precambrian blocks in eastern Asia. However, the early history of the Cathaysia Block is poorly understood due largely to ...
Zircon U–Pb–Lu–Hf–O isotopic evidence for =3.5 Ga crustal growth,reworking and differentiation in the northern Tarim CratonGe, Rongfeng; Zhu, W.; Wilde, Simon; He, J. (2014)Continental crust was largely generated before 2.5 Ga through mafic–ultramafic and TTG (tonalite-trondhjemite-granodiorite) magmatism, but it is contentious when did such primitive crust evolve into mature granodioritic ...