Asteroid impact ejecta units overlain by iron-rich sediments in 3.5-2.4 Ga terrains, Pilbara and Kaapvaal cratons: Accidental or cause-effect relationships?
The significance of temporal and spatial associations between asteroid/comet impact ejecta units and overlying iron-rich sediments, including banded iron-formation (BIF), jaspilite and ferruginous shale, observed in the Pilbara Craton, Western Australia and the Barberton Greenstone Belt (BGB), Kaapvaal Craton, South Africa, is considered. Such associations include (1) 3470.1 ± 1.9 Ma impact spherule units and tsunami-type breccia overlain by jaspilite in the Antarctic Chert Member, central...[Show more]
|Collections||ANU Research Publications|
|Source:||Earth and Planetary Science Letters|