18. Mode of emplacement of shallow igneous bodies in the Malargüe fold and thrust belt, Mendoza

ARAUJO, VANESA; NATALIA SANCHEZ; FRISICALE, MARIA; MARTIN TURIENZO; LEBINSON, FERNANDO; DIMIERI, LUIS

Malargue

Simposio; LASI VI; 2019

LASI

It is considered that the rheological contrast between strata and tabular igneous bodies exert an important control on the emplacement and shape of magmatic bodies (Menand, 2011; Thomson and Schofield, 2008). Field observations and laboratory experiments regarding the location of sills and laccoliths indicate that some of these are formed when the feed channel reaches a layer whose rigidity does not allow to progress, thereby causing the lateral spread of magma (Kavanagh et al., 2006). There are several publications studying emplacement models of these bodies in compressive environments (Galland et al., 2007; Montanari et al., 2010; Menand, 2011; Ferre et al., 2012; Walker et al., 2016) which reveal that the bodies are constructed from amalgamation of successive pulses of tabular bodies, that are emplaced through fault systems under compressive stresses.The Malargüe FTB is a suitable place to study the mode of emplacement of neogene shallow intrusives likes sills, dykes and laccoliths. Figure 1 shows the distribution of the main bodies exposed in our study area.