A Silurian regional tectonometamorphic event has been widely recorded by different geochronological methods in the Sierras Pampeanas, NW Argentina and the Precordillera. It took place between ca. 445 and 420 Ma after the regional Hirnantian (late Ordovician) glaciogenic sedimentation. Three domains are recognized. 1) The eastern Sierras Pampeanas and the Puna mainly record focused westward ductile thrusting and heating. 2) In the westernmost Sierras Pampeanas (Maz, Espinal, and Umango) garnet-amphibolite facies metamorphism, penetrative foliation development and westward ductile thrusting (nappes) took place. 3) In the Precordillera, the Rinconada formation of Silurian age consisting of chaotic olistoliths of Ordovician and Cambrian age correlates with this event. The three domains correspond to the hinterland, the internal hot and thickened metamorphic core, and the foreland respectively of an orogenic belt. Remarkably no Cordilleran-type magmatism of this age has been recorded. The regional importance of this event was overlooked so far.

志留纪区域构造变质事件已通过不同的地质年代学方法在 Sierras Pampeanas、NW Argentina 和 Precordillera 被广泛记录。它发生在大约之间。区域海南期（晚奥陶世）冰川沉积后的 445 和 420 Ma。识别三个域。1) 东部潘佩亚纳山脉和普纳山脉主要记录了集中的向西延展性逆冲和加热。2) 在最西端的潘佩纳山脉 (Maz、Espinal 和 Umango) 发生石榴石-角闪岩相变质作用、穿透叶理发育和向西延展性逆冲作用 (nappes)。3）在前科迪勒拉，由奥陶纪和寒武纪混沌石石组成的志留纪Rinconada组与该事件相关。三域对应腹地，内部高温和增厚的变质核，分别是造山带的前陆。值得注意的是，没有记录到这个时代的科迪勒拉型岩浆活动。迄今为止，人们忽视了这一事件的区域重要性。