Five Pleistocene basaltic volcanoes in Crater Flat (southern Nevada) demonstrate thc complexity of eruption processes associated with small-volume basalts and the cffccts of initial emplacement characteristics on post-eruptive geomorphic evolution of thc volcanic surfaces. The volcanoes record eruptive processes in their pyroclastic facies ranging from "classical" Strombolian mechanisms to, potentially, violent Strombolian mechanisms. Cone growth was accompanied, and sometimes disrupted, by effusion of lavas from the bases of cones. Pyroclastic cones were built upon a gently southwardsloping surface and were prone to failure of their down-slope (southern) flanks. Early lavas flowed primarily southward and, at Red and Black Cone volcanoes, carricd abundant rafts of cone material on the tops of the flows. These resulting early lava ficlds eventually built platforms such that later flows erupted from the eastern (at Rcd Cone) and northern (at Black Cone) bases of the cones. Three major surface features -scoria cones, lava fields with abundant rafts of pyroclastic material, and lava fields with littlc or no pyroclastic material -experienced different post-eruptive surficial processcs. 1Contrary to previous interpretations, we argue that the Pleistocene Crater Flat volcanoes are monogenetic, each having formed in a single eruptive episode lasting months to a few years, and with all eruptive products having emanated from the area of the volcanocs' main cones rather than from scattered vents. Geochemical variations within thc volcanoes must be interpreted within a monogenetic framework, which implies preservation of magma source heterogeneities through ascent and eruption of thc magmas.
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