caa a22 4500 60614952X CHVBK 20210128100534.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00531-014-1112-8 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1112-8 The Ordovician Las Chacritas pluton (Sierra de Humaya, NW Argentina): origin and emplacement triggered by lateral shortening and magmatic stoping at mid-crustal level [Elektronische Daten] [Mariano Larrovere, Pablo Alasino, Camilo de los Hoyos, Arne Willner] Field relationships and structural studies combined with in situ U-Th-Pb dating of monazite from Las Chacritas pluton (LCP), Sierra de Humaya, provide insight into the emplacement of peraluminous magmas triggered by lateral shortening of the host rock and magmatic stoping at a mid-crustal level of a retro-arc zone in a convergent orogen. Modal and chemical compositions indicate that the LCP is composed of two main igneous units of peraluminous granitoids. The predominant two-mica granitoids were generated by interaction of crustal rocks with mafic or mafic-derived magmas and/or crystal-rich magmas that entrained residual phases, whereas less abundant leucocratic granitoids may have been originated by partial melting of metasedimentary rocks. The calculated crystallization age of 474±4Ma is consistent with Ordovician ages (477-470Ma) of the high-grade metamorphic rocks, indicating concomitant magmatism and metamorphism during the Famatinian orogeny. The LCP was emplaced in the middle crust at a maximum depth of ~14.5km, where attendant fracturing and ductile deformation were active. Field evidence shows strong temporal and spatial relationships between host rock ductile deformation and the emplacement of the pluton such as folding and strike deflection of the host rock layering and folded concordant leucocratic sheets with magmatic fabrics. This suggests that material transfer processes like lateral wall rock displacement (lateral shortening) was a viable mechanism for the emplacement of the LCP. However, cross-sectional restoration and field evidence such as wall rock xenoliths and intrusive truncations of the host rock foliation and fold traces suggest that magmatic stoping was a complementary mechanism to create the necessary space for the emplacement of the LCP. This work supports previous studies showing that participation of multiple material transfer processes are the rule rather than the exception in the emplacement of plutons. Springer-Verlag Berlin Heidelberg, 2014 Petrogenesis nationallicence Emplacement nationallicence Ductile deformation nationallicence Stoping nationallicence U-Pb-Th dating nationallicence Las Chacritas pluton nationallicence Larrovere Mariano Centro Regional de Investigaciones Científicas y Transferencia Tecnológica La Rioja, Consejo Nacional de Investigaciones Científicas y Técnicas (CRILAR-CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina aut Alasino Pablo Centro Regional de Investigaciones Científicas y Transferencia Tecnológica La Rioja, Consejo Nacional de Investigaciones Científicas y Técnicas (CRILAR-CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina aut de los Hoyos Camilo Leonidas Aguirre 67, 5500, Mendoza, Argentina aut Willner Arne Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44780, Bochum, Germany aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 565-586 1437-3254 104:3<565 2015 104 531 https://doi.org/10.1007/s00531-014-1112-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1112-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Larrovere Mariano Centro Regional de Investigaciones Científicas y Transferencia Tecnológica La Rioja, Consejo Nacional de Investigaciones Científicas y Técnicas (CRILAR-CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina aut NATIONALLICENCE 700 1- Alasino Pablo Centro Regional de Investigaciones Científicas y Transferencia Tecnológica La Rioja, Consejo Nacional de Investigaciones Científicas y Técnicas (CRILAR-CONICET), Entre Ríos y Mendoza, 5301, Anillaco, La Rioja, Argentina aut NATIONALLICENCE 700 1- de los Hoyos Camilo Leonidas Aguirre 67, 5500, Mendoza, Argentina aut NATIONALLICENCE 700 1- Willner Arne Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44780, Bochum, Germany aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/3(2015-04-01), 565-586 1437-3254 104:3<565 2015 104 531