The emplacement of the granitic Las Tazas complex, northern Chile: the relationship between local and regional strain

摘要: Abstract The Coastal batholith of northern Chile grew under transtensional–extensional conditions that prevailed along the Andean margin during Mesozoic. hosts Atacama Fault Zone, a major arc-parallel fault system which was characterised by sinistral transtensional shearing Early Cretaceous. Las Tazas complex is composite granitoid intrusion emplaced syntectonically Zone at ∼130 Ma. Syntectonic emplacement indicated consistent kinematic history between and its wall rocks, together with synchronous crystallisation ages. In contrast to regional patterns, local change from vertical east-side-down dextral transcurrent displacement zone. During intrusion, strain partitioned non-coaxial simple within country-rock mylonites flattening across crystallising complex. This combination indicates pluton temporary transpressive were localised around pluton, probably induced magma emplacement. Such difference suggests emplacement-related structures should only be related strain-states great care.