Spatial distribution and structural analysis of the Neogene Siroua volcanic field (Moroccan Atlas Mountains)

Abstract

Monogenetic volcanic fields develop worldwide in different geodynamic settings, and understanding their evolution may provide crustal, thermal, and topographical constraints. We focus on the small monogenetic Siroua volcanic field that has formed since the late Miocene along the tectonic lineament separating the High Atlas and the Anti-Atlas Mountains of Morocco, though the evolution of which is still unclear. We investigate the formation and evolution of the Siroua monogenetic field using geostatistical methods that allow us to classify the spatial distribution of vents in their geological contexts. In addition, we use aeromagnetism to obtain information about the tectonic structures underlying the field. Each method is evaluated separately, and then combined to discuss the relationship between the volcanism and the tectonic framework at regional and local scales. Our findings indicate that although vents are broadly randomly distributed, some correlation between volcanic alignments and the structural framework is locally observed. These findings corroborate existing knowledge about the influence of pre-existing structures on the propagation of magmas and on the spatial distribution of volcanic vents within monogenetic volcanic fields.