introduction mesgar iron occurrence is located in northwestern part of the central iran, 115 km south of zanjan. although there is a sequence of volcanic-pyroclastic rocks accompanied by iron mineralization, no detailed works had been conducted in the area. the present paper provides an overview of the geological framework, the mineralization characteristics, and the results of geochemical stud...

Damavand volcano is located 60 km to the East North- East of Tehran. It is a dormant stratovolcano outcrop in the Alborz Mountains of northern Iran and is the highest mountain (5670 m) in the Middle East and West Asia. Mazandaran Province, one of the most populous provinces by population density, Semnan and Gorgan provinces further east are neighbours of the Damavand. Volcanism in Damavand goes...

Damavand is a large dormant stratovolcano in the Alborz Mountains of northern Iran located in one of the most populous provinces, which could be adversely affected by tephra fall from Damavand. The youngest known eruption is a lava flow on the western flanks with an age of 7.3 ka. The volcanic products are predominantly porphyritic trachyandesite. Three major young pumice deposits, named here a...

Abstract The deposits of Plinian and subplinian eruptions provide critical insights into past volcanic events inform numerical models that aim to mitigate against future hazards. However, pyroclastic are often considered from either a fallout or density current (PDC) perspective, with little attention given facies exhibiting characteristics both processes. Such hybrid units may be created where...

near Taruntius Crater appears to be relatively young (~1 Ga) [14]. Of >80 floor-fractured craters mapped by Wilhelms ( Plate 5 in [15]), ~15 have pyroclastic deposits, suggesting that these features may have provided an enhanced environment for explosive volcanic eruption. The spatial association of volcanic eruption sites and impact craters and basins on the Moon is believed to be related to c...

We developed a minimal three-dimensional Cellular Automata (CA) model for pyroclastic flows, generated by collapsing volcanic columns. Our aim is to simulate numerically simple ideal situations and to test that main phenomenological conditions appear correctly in the simulations. Model applications could be very important in order to assess pyroclastic flow hazard in densely inhabited areas. CA...

[1] Exogenous growth of Peléean lava domes involves the addition of lava from a central summit vent and mass wasting on the flanks as rockfalls and pyroclastic flows. These processes were investigated at the Soufrière Hills Volcano, Montserrat, between 30 March and 10 April 2006, using a ground-based imaging millimeter-wave radar, AVTIS, to measure the shape of the dome and talus surface and ro...

Cellular Automata (CA) represent an alternative approach to differential equations to model and simulate complex fluid dynamical systems, whose evolution depends on the local interactions of their constituent parts. A new notion of CA was developed by our research group Empedocles. It permitted to improve significantly an empirical method for modelling macroscopic phenomena, concerning surface ...

This paper summarizes results of a study of porosity, permeability, microstructure and acoustic properties of volcanic and pyroclastic rocks fromCampi Flegrei (CF) andMt. Etna (ET), Italy. We have measured the hydraulic, transport and acoustics properties of 28 room-dry samples at ambient conditions, 25 room-dry samples under confining pressure (up to 60 MPa) and 5 brine saturated samples under...