Few monogenetic eruptions that produced lava flows have occurred in historical times, limiting the observations of their impact on human settlements. However, rheological models based morphological and petrological datasets can contribute to decipher eruptive dynamics durations ancient eruptions. The Malpaís de Zacapu, a temporal-spatial volcano cluster at western margin Zacapu lacustrine basin...

the chah morra cu occurrence is located 15 to 20 km north of toroud village, south of shahrood. in this area, cu deposits are hosted by the andesitic sequence and most of rocks in this area are composed of andesite. veins contain minerals such as digenite, bornite, covellite, malachite, cuprite, tenorite, native copper and fe oxide and hydroxides. also some orthomagmatic magnetite and chalcopyr...

Usual methods are unfortunately unsuitable to accurately date many Holocene deposits and landforms from active Mexican volcanoes. This is notably the case for Tacaná Volcanic Complex (TVC), located in State of Chiapas southern Mexico, San Marcos Department Guatemala. The complex consists Chichuj, Tacaná, Antonio volcanoes Ardillas dome. volcano, main summit TVC, collapsed 15 ± 5 ka ago (40Ar/39...

Andesites are refined and “cold” magmas compared to their basaltic parents, yet large volumes of andesites generated at continental arcs. We show that andesitic plutons favored when arc crust attains a thickness ~60 km while mafic small is thin. Using simple thermal models, we large, long-lived relatively cold partially molten zones, sustained by recharge hydrous magmas, depth thick due the red...

A composition of n ∈ N is an ordered collection of one or more positive integers whose sum is n. The number of summands is called the number of parts of the composition. A palindromic composition of n is a composition of n in which the summands are the same in the given or in reverse order. In this paper we study the generating function for the number of compositions (respectively, palindromic ...