<p>Negro de Chorrillos (Puna plateau, NW Argentina) is a shoshonitic scoria cone traditionally classified as monogenetic. This study documents a Late Pleistocene volcanic debris avalanche (VDA) associated with the simultaneous collapse of a scoria cone and its underlying lava field in a South American monogenetic center unrelated to rafting processes. High-resolution TanDEM-X DEM analysis and fieldwork reveal a 0.007 km³ collapse comprising a 100-m-thick Toreva block (0.004 km³) preserving welded cone facies (unit D) and a distal hummocky debris tongue (0.003 km³) dominated by jigsaw-fractured lava megablocks from pre-collapse lava units (units A and B). The collapse was likely triggered by a combination of factors, including the volcano’s emplacement on an oversteepened slope and tectonic influence along the Chorrillos Fault, possibly enhanced by seismic activity. Stratigraphic relationships show fluvial deposits between lava units B and C, indicating temporal hiatuses. The presence or absence of phlogopite in different lava flows evidences at least two distinct magma batches. These features define Negro de Chorrillos as a polycyclic and polymagmatic monogenetic volcano, demonstrating that small-volume centers can exhibit complex lifecycles previously attributed only to polygenetic systems. This case expands the known spectrum of monogenetic volcanism and highlights overlooked secondary hazards (debris avalanches) in back-arc mafic fields.</p>