Hadean zircon - Wikipedia
Hadean zircon is the oldest-surviving crustal material from the Earth's earliest geological time period, the Hadean eon, about 4 billion years ago. Zircon is a mineral that is commonly used for radiometric dating because it is highly resistant to chemical changes and appears in the form of small crystals or grains in most igneous and ...
Hadaean to Palaeoarchaean stagnant-lid tectonics revealed by zircon …
2023年6月14日 · Herein, we report palaeointensity data from Hadaean-age to Mesoarchaean-age single detrital zircons bearing primary magnetite inclusions from the Barberton Greenstone Belt of South Africa 5.
The only identified materials on the Earth with unequivocal UePb ages extending into the Hadean are ancient >4000 Ma zircon grains that are dominantly found as detrital grains in Archean rocks in the ancient crustal nuclei of Western Australia and are only rarely found elsewhere. In Western Australia, variably metamorphosed metasedimentary
Hadean age for a post-magma-ocean zircon confirmed by atom …
2014年2月23日 · Here we use atom-probe tomography 8 to identify and map individual atoms in the oldest concordant grain from Earth, a 4.4-Gyr-old Hadean zircon with a high-temperature overgrowth that formed...
Hadean diamonds in zircon from Jack Hills, Western Australia
2007年8月23日 · Here we present the discovery of microdiamond inclusions in Jack Hills zircons with an age range from 3,058 ± 7 to 4,252 ± 7 million years. These include the oldest known diamonds found in...
Hadean zircon formed due to hydrated ultramafic protocrust …
2021年11月22日 · Our study tested the hypothesis that an early felsic crust may have formed by low-pressure, fluid-present melting of hydrated peridotite interacting with basaltic magma through assessment of the capacity of experimental felsic melts (Borisova et al., 2021) to crystallize zircon (referred to here as “model zircon”) and then comparison of the ...
A Hadean to Paleoarchean geodynamo recorded by single zircon …
2015年7月31日 · We report full-vector paleointensity measurements of Archean to Hadean zircons bearing magnetic inclusions from the Jack Hills conglomerate (Western Australia) to reconstruct the early geodynamo history.
Evidence for oceans pre-4300 Ma confirmed by preserved igneous ...
2024年10月1日 · Detrital zircons from the Jack Hills are the dominant source of Hadean (pre-4000 Ma) terrestrial material available for study today. Values of δ 18 O in many of these zircons (6.0 to 7.5‰) are above the mantle-equilibrated value.
Geology, age and field relations of Hadean zircon-bearing …
2012年6月18日 · Hadean zircons shed from a previously larger and more exposed “Slave Continent” that was variably exposed and eroded at different times in geologic history could explain this result.
Hadean tectonics: Insights from machine learning | Geology ...
2023年5月30日 · Here, we developed high-dimensional machine learning (ML) approaches using zircon chemistry data (spanning 19 elements over 4.0 b.y.) to characterize zircons that crystallized in some typical tectonic settings (e.g., arcs, plume-related hotspots, and rifts) and from either igneous (I-type) or sedimentary (S-type) magmas.