James L. Aronson

TL;DR: In this paper, six major volcanic episodes are recognized in the rift9s development over a time span from the late Oligocene to the Quaternary using K/Ar data.

TL;DR: Rapport preliminaire de la decouverte d'un maxilaire d'Homo associe a un outillage Oldowayen et a une faune du Pliocene final dans une formation Hadar en Ethiopiaie Les elements de datation 4 0A R/3 9A R indiquent indiquant un age de 23 MA ± 007 Ils indiqueraient la plus ancienne association de restes hominides et d'outillage and probablement la plus-ancienne sequence datee du

TL;DR: In this article, the authors used K-Ar and 40 Ar/39 Ar geochronology data from a transect of the Chamo basin and the Amaro horst-Galana basin to estimate a minimum 12 km crustal extension (β ≈ 1.12), and infer that maximum extension across the southern Ethiopian rift is less than 25 km.

TL;DR: In this article, 40 K-Ar and 40 Ar / 39 Ar isotopic ages from the northern Main Ethiopian Rift (MER)-southern Afar transition zone provide insights into the volcano-tectonic evolution of this portion of the East African Rift system.

TL;DR: In this article, the authors identify and characterize a widespread low-K, high-alumina olivine tholeiite (HAOT) magma type in the northwestern Great Basin.