globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-014-1112-8
Scopus记录号: 2-s2.0-84925511259
论文题名:
The Ordovician Las Chacritas pluton (Sierra de Humaya, NW Argentina): origin and emplacement triggered by lateral shortening and magmatic stoping at mid-crustal level
作者: Larrovere M.A.; Alasino P.H.; de los Hoyos C.R.; Willner A.P.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期:3
起始页码: 565
结束页码: 586
语种: 英语
英文关键词: Ductile deformation ; Emplacement ; Las Chacritas pluton ; Petrogenesis ; Stoping ; U–Pb–Th dating
英文摘要: 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 ± 4 Ma is consistent with Ordovician ages (477–470 Ma) 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 ~14.5 km, 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. © 2014, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925511259&doi=10.1007%2fs00531-014-1112-8&partnerID=40&md5=0e956abff469313c6e3bb9eb524c82e6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70305
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Centro Regional de Investigaciones Científicas y Transferencia Tecnológica La Rioja, Consejo Nacional de Investigaciones Científicas y Técnicas (CRILAR-CONICET), Entre Ríos y Mendoza, Anillaco, La Rioja, Argentina; Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Av. Gob. Vernet y Apóstol Felipe, La Rioja, Argentina; Leonidas Aguirre 67, Mendoza, Argentina; Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, Bochum, Germany

Recommended Citation:
Larrovere M.A.,Alasino P.H.,de los Hoyos C.R.,et al. The Ordovician Las Chacritas pluton (Sierra de Humaya, NW Argentina): origin and emplacement triggered by lateral shortening and magmatic stoping at mid-crustal level[J]. International Journal of Earth Sciences,2015-01-01,104(3)
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