Growth of the Patagonian Andessince the Mid Jurassic to the Present

FOLGUERA, A.; ORTS, DARÍO; LITVAK, VANESA D.; GIANNI, GUIDO; FERNÁNDEZ PAZ, LUCÍA; ENCINAS, ALFONSO; ECHAURREN, ANDRÉS; IANNELLI, SOFIA

Concepción

Congreso; XV Congreso Geológico Chileno; 2018

The Patagonian Andes have been constructed through several deformational stages. Thus, Jurassic within plate contractional􀁖􀁜􀁖􀁗􀁈􀁐􀁖􀀃 􀁋􀁄􀁖􀀃 􀁄􀁏􀁗􀁈􀁕􀁑􀁄􀁗􀁈􀁇􀀃 􀁚􀁌􀁗􀁋􀀃 􀁓􀁈􀁕􀁌􀁒􀁇􀁖􀀃 􀁒􀁉􀀃 􀁈􀁛􀁗􀁈􀁑􀁖􀁌􀁒􀁑􀀃 􀁄􀁖􀁖􀁒􀁆􀁌􀁄􀁗􀁈􀁇􀀃 􀁚􀁌􀁗􀁋􀀃 􀁗􀁋􀁈􀀃 􀁈􀁐􀁓􀁏􀁄􀁆􀁈􀁐􀁈􀁑􀁗􀀃 􀁒􀁉􀀃 􀁗􀁋􀁈􀀃 􀀮􀁄􀁕􀁒􀁒􀀐􀀩􀁈􀁕􀁕􀁄􀁕􀀃 􀀯􀀬􀀳􀀃 􀁓􀁕􀁒􀁇􀁘􀁆􀁌􀁑􀁊􀀃 􀁓􀁕􀁒􀁗􀁒􀀐􀀤􀁑􀁇􀁈􀁄􀁑􀀃 􀁐􀁒􀁘􀁑􀁗􀁄􀁌􀁑􀀃 􀁖􀁜􀁖􀁗􀁈􀁐􀁖􀀑􀀃 􀀷􀁋􀁈􀁖􀁈􀀃 􀁇􀁈􀁉􀁒􀁕􀁐􀁄􀁗􀁌􀁒􀁑􀁖􀀃 􀁄􀁕􀁈􀀃 􀁈􀁛􀁓􀁏􀁄􀁌􀁑􀁈􀁇􀀃 􀁅􀁜􀀃 􀁄􀀃 􀁓􀁄􀁕􀁗􀁌􀁆􀁘􀁏􀁄􀁕􀀃 􀁇􀁈􀁉􀁒􀁕􀁐􀁄􀁗􀁌􀁒􀁑􀁄􀁏􀀃 􀍤􀁈􀁏􀁇􀀃 􀁌􀁐􀁓􀁒􀁖􀁈􀁇􀀃 􀁅􀁜􀀃 􀁗􀁋􀁈􀀃 􀁖􀁒􀁘􀁗􀁋􀁚􀁄􀁕􀁇􀀃􀁇􀁌􀁖􀁓􀁏􀁄􀁆􀁈􀁐􀁈􀁑􀁗􀀃􀁒􀁉􀀃􀀶􀁒􀁘􀁗􀁋􀀃􀀤􀁐􀁈􀁕􀁌􀁆􀁄􀀏􀀃􀁗􀁋􀁈􀀃􀀺􀁈􀁇􀁇􀁈􀁏􀁏􀀃􀁖􀁈􀁄􀀃􀁒􀁓􀁈􀁑􀁌􀁑􀁊􀀃􀁄􀁑􀁇􀀃􀁐􀁈􀁆􀁋􀁄􀁑􀁌􀁆􀁄􀁏􀀃􀁚􀁈􀁄􀁎􀁈􀁑􀁌􀁑􀁊􀀃􀁌􀁐􀁓􀁒􀁖􀁈􀁇􀀃􀁅􀁜􀀃􀁗􀁋􀁈􀀃􀁋􀁒􀁗􀁖􀁓􀁒􀁗􀀃􀁄􀁆􀁗􀁌􀁙􀁌􀁗􀁜􀀑􀀃􀀷􀁋􀁌􀁖􀀃􀁆􀁋􀁄􀁒􀁗􀁌􀁆􀀃􀁖􀁜􀁖􀁗􀁈􀁐􀀃􀁌􀁖􀀃􀁕􀁈􀁓􀁏􀁄􀁆􀁈􀁇􀀃􀁄􀁗􀀃􀁗􀁋􀁈􀀃􀀨􀁄􀁕􀁏􀁜􀀃􀀦􀁕􀁈􀁗􀁄􀁆􀁈􀁒􀁘􀁖􀀃􀁅􀁜􀀃􀁄􀁑􀀃􀁌􀁑􀁗􀁕􀁄􀀐􀀃􀁅􀁄􀁆􀁎􀀐􀁄􀁕􀁆􀀃􀁈􀁛􀁗􀁈􀁑􀁖􀁌􀁒􀁑􀁄􀁏􀀃􀁖􀁜􀁖􀁗􀁈􀁐􀀃􀁗􀁋􀁄􀁗􀀃􀁌􀁖􀀃􀁌􀁑􀁙􀁈􀁕􀁗􀁈􀁇􀀃􀁌􀁑􀀃􀁗􀁋􀁈􀀃􀁏􀁄􀁗􀁈􀀃􀀨􀁄􀁕􀁏􀁜􀀃􀀦􀁕􀁈􀁗􀁄􀁆􀁈􀁒􀁘􀁖􀀃􀁓􀁕􀁒􀁇􀁘􀁆􀁌􀁑􀁊􀀃􀁄􀀃􀍤􀁕􀁖􀁗􀀃􀁌􀁑􀁗􀁈􀁊􀁕􀁄􀁗􀁈􀁇􀀃􀁉􀁒􀁕􀁈􀁏􀁄􀁑􀁇􀀃􀁅􀁄􀁖􀁌􀁑􀀃􀁄􀁑􀁇􀀃􀁄􀀃􀁅􀁕􀁒􀁄􀁇􀀃􀁉􀁒􀁏􀁇􀀃􀁄􀁑􀁇􀀃􀁗􀁋􀁕􀁘􀁖􀁗􀀃􀁅􀁈􀁏􀁗􀀑􀀃􀀷􀁋􀁌􀁖􀀃􀁈􀁛􀁆􀁈􀁓􀁗􀁌􀁒􀁑􀁄􀁏􀀃􀁇􀁈􀁙􀁈􀁏􀁒􀁓􀁐􀁈􀁑􀁗􀀃􀁒􀁉􀀃􀁗􀁋􀁈􀀃􀁉􀁒􀁏􀁇􀀃􀁄􀁑􀁇􀀃􀁗􀁋􀁕􀁘􀁖􀁗􀀃􀁅􀁈􀁏􀁗􀀃􀁆􀁒􀁌􀁑􀁆􀁌􀁇􀁈􀁖􀀃􀁚􀁌􀁗􀁋􀀃􀁗􀁋􀁈􀀃􀁈􀁄􀁖􀁗􀁚􀁄􀁕􀁇􀀃􀁄􀁇􀁙􀁄􀁑􀁆􀁈􀀃􀁒􀁉􀀃􀁗􀁋􀁈􀀃􀁄􀁕􀁆􀀃􀁄􀁆􀁗􀁌􀁙􀁌􀁗􀁜􀀃􀁚􀁋􀁌􀁆􀁋􀀃􀁌􀁖􀀃􀁌􀁑􀁗􀁈􀁕􀁓􀁕􀁈􀁗􀁈􀁇􀀃􀁌􀁑􀀃􀁗􀁈􀁕􀁐􀁖􀀃􀁒􀁉􀀃􀁄􀀃􀁖􀁋􀁄􀁏􀁏􀁒􀁚􀀃􀁖􀁘􀁅􀁇􀁘􀁆􀁗􀁈􀁇􀀃􀁖􀁏􀁄􀁅􀀃􀁆􀁒􀁑􀍤􀁊􀁘􀁕􀁄􀁗􀁌􀁒􀁑􀀃associated with a stable seismic ridge impacting at the Patagonian trench. These Cretaceous contractional structures are affectedby Eocene deformations that are variable in mechanics depending on the latitude: While some segments of the fold and thrustbelt are extensionally reactivated, others are contractionally reactivated. This variable behavior is interpreted as due to the obliquecollision of a seismic ridge from north to south that produced slab windows alternated with segments where transform segments􀁆􀁒􀁏􀁏􀁌􀁇􀁈􀁇􀀑􀀃 􀀯􀁄􀁗􀁈􀁖􀁗􀀃 􀀨􀁒􀁆􀁈􀁑􀁈􀀃 􀁗􀁒􀀃 􀀲􀁏􀁌􀁊􀁒􀁆􀁈􀁑􀁈􀀃 􀁗􀁈􀁆􀁗􀁒􀁑􀁌􀁆􀁖􀀃 􀁌􀁖􀀃 􀁆􀁋􀁄􀁕􀁄􀁆􀁗􀁈􀁕􀁌􀁝􀁈􀁇􀀃 􀁅􀁜􀀃 􀁚􀁌􀁇􀁈􀁖􀁓􀁕􀁈􀁄􀁇􀀃 􀁈􀁛􀁗􀁈􀁑􀁖􀁌􀁒􀁑􀀃 􀁚􀁌􀁗􀁋􀀃 􀁅􀁄􀁆􀁎􀀐􀀃 􀁄􀁑􀁇􀀃 􀁌􀁑􀁗􀁕􀁄􀀐􀁄􀁕􀁆􀀃 􀁅􀁄􀁖􀁌􀁑􀁖􀀃 􀁄􀁑􀁇􀀃the outstanding detachment of Los Chonos fore-arc sliver. This extensional stage ends at the earliest Miocene with Atlantic and􀀳􀁄􀁆􀁌􀍤􀁆􀀐􀁇􀁈􀁕􀁌􀁙􀁈􀁇􀀃􀁗􀁕􀁄􀁑􀁖􀁊􀁕􀁈􀁖􀁖􀁌􀁒􀁑􀁖􀀃􀁗􀁋􀁄􀁗􀀃􀁆􀁒􀁘􀁏􀁇􀀃􀁅􀁈􀀃􀁌􀁑􀁗􀁈􀁕􀁓􀁕􀁈􀁗􀁈􀁇􀀃􀁌􀁑􀀃􀁗􀁈􀁕􀁐􀁖􀀃􀁒􀁉􀀃􀁗􀁋􀁈􀁕􀁐􀁄􀁏􀀃􀁖􀁘􀁅􀁖􀁌􀁇􀁈􀁑􀁆􀁈􀀃􀁄􀁑􀁇􀀒􀁒􀁕􀀃􀁇􀁜􀁑􀁄􀁐􀁌􀁆􀀃􀁖􀁘􀁅􀁖􀁌􀁇􀁈􀁑􀁆􀁈􀀃􀁌􀁑􀀃􀁄􀀃􀁆􀁒􀁑􀁗􀁈􀁛􀁗􀀃􀁒􀁉􀀃􀁗􀁋􀁈􀀃􀁖􀁗􀁈􀁈􀁓􀁈􀁑􀁌􀁑􀁊􀀃􀁒􀁉􀀃􀁗􀁋􀁈􀀃􀀱􀁄􀁝􀁆􀁄􀀃􀁖􀁘􀁅􀁇􀁘􀁆􀁗􀁈􀁇􀀃􀁖􀁏􀁄􀁅􀀑􀀃􀀷􀁋􀁈􀀃􀀦􀁋􀁒􀁑􀁒􀁖􀀃􀁉􀁒􀁕􀁈􀀐􀁄􀁕􀁆􀀃􀁅􀁏􀁒􀁆􀁎􀀃􀁄􀁆􀁆􀁕􀁈􀁗􀁈􀁖􀀃􀁌􀁑􀀃􀁈􀁄􀁕􀁏􀁜􀀃􀀰􀁌􀁒􀁆􀁈􀁑􀁈􀀃􀁗􀁌􀁐􀁈􀁖􀀃􀁓􀁕􀁒􀁇􀁘􀁆􀁌􀁑􀁊􀀃􀁄􀀃􀁅􀁕􀁒􀁄􀁇􀀃fold and thrust belt that reaches Central Patagonia in mid-Miocene times. This process is accompanied by mild east-ward arcmigrations at the edges of the Chonos accretion zone interpreted as subducted slab shallowing. Late Miocene deformation isfocused on out-of-sequence thrusts that produce the rain shadow conditions that characterize Patagonia producing strong biotachanges. Mild Quaternary reactivations of the Miocene systems are the late expression of this uplift.