We present an oxygen isotope and petrologic study of four voluminous, zoned ash-flow sheets of the Southwestern Nevada Volcanic Field (SWNVF): Topopah Spring (TS, .1200 km3, 12.8 Ma), Tiva Canyon (TC, 1000 km3, 12.7 Ma), Rainier Mesa (RM, 1200 km3, 11.6 Ma), and Ammonia Tanks (AT, 900 km3, 11.45 Ma). The d18O values of quartz, sanidine, sphene, magnetite, and zircons in rhyolites and latites of...

A continuous record of Pliocene-Pleistocene East African volcanic tephra deposition has been developed from a marine sediment sequence at Ocean Drilling Program Sites 721/722 in the Arabian Sea, some 2000 km distant from Ethiopian source volcanoes. The marine depositional sequence is continuous over the Pliocene-Pleistocene interval, has a wealth of published data addressing regional paleoclima...

The eruptive history of Pantelleria has been marked by the eruption nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres. New whole-rock geochemical data are presented for seven ignimbrites and used published younger units to track compositional changes time. From ∼190 ka, silicic magmatism was dominated comenditic trachyte comendite compositions, evol...