Diverse intrusion modes during the construction of a high-silica magma reservoir: Evidence from La Obra-Cerro Blanco intrusive suite (central Chile)

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dc.contributor.authorPayacan, Italo
dc.contributor.authorCovarrubias, Maria Alejandra
dc.contributor.authorRodriguez, Nicolas
dc.contributor.authorTavazzani, Lorenzo
dc.contributor.authorGutierrez, Francisco
dc.contributor.authorRoperch, Pierrick
dc.contributor.authorPoblete, Fernando
dc.contributor.authorMeyer, Martin
dc.date.accessioned2025-01-20T16:04:37Z
dc.date.available2025-01-20T16:04:37Z
dc.date.issued2024
dc.description.abstractSeveral conceptual models have been proposed for the amalgamation of granitoid plutons, which range from incremental growth to single-stage emplacement of these systems. This diversity of views has led to intense debate about the thermomechanical state of silicic intrusions and the magma differentiation paths within the crust. In this contribution, we present a comprehensive petrologic, geochronologic, and magnetic fabric data set from the La Obra-Cerro Blanco intrusive suite, which allows us to explore the petrogenesis and magma emplacement processes in the upper crust.
dc.description.abstractThis intrusive suite is composed of (1) a vertically zoned granitoid intrusion in spatial association with mafic layers and stocks and (2) a cupola-like high-silica granite. We interpret this intrusive suite as assembled by diverse but coexisting intrusion mechanisms over a time span of similar to 1.4 m.y. from 21.4 to 19.9 Ma. As indicated by the subhorizontal magnetic lineation, the first stage was dominated by horizontal emplacement of sheet-like intrusions of intermediate compositions, which became increasingly silicic after plagioclase and amphibole fractionation throughout the crustal column. The latest stage was instead dominated by cooling, crystallization, and differentiation of a thickened granitoid body and the formation of a high-silica magma chamber. The steep magnetic lineation and the abundance of aplite and rhyolitic dikes observed in the cupola-like, high-silica granites suggest that this portion acted as an evacuation channel of high-silica magma toward shallower levels, offering a rare opportunity to understand not only silicic magma accumulation and storage in the upper crust, but also the processes connecting the plutonic and volcanic environments.
dc.fuente.origenWOS
dc.identifier.doi10.1130/GES02746.1
dc.identifier.issn1553-040X
dc.identifier.urihttps://doi.org/10.1130/GES02746.1
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89822
dc.identifier.wosidWOS:001348325400001
dc.language.isoen
dc.revistaGeosphere
dc.rightsacceso restringido
dc.titleDiverse intrusion modes during the construction of a high-silica magma reservoir: Evidence from La Obra-Cerro Blanco intrusive suite (central Chile)
dc.typeartículo
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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