[Geoinfo] Invitación: Conferencia Dr. Olivier Galland, Lunes 1/4 - 11hs

[Daniel Yagupsky]

>
> *EL INSTITUTO DE ESTUDIOS ANDINOS**Don Pablo Groeber*
>
> *UBA – CONICET*
>
>  *y*
>
> *EL DEPARTAMENTO DE CIENCIAS GEOLÓGICAS-FCEyN-UBA*
>
> Invitan a Ud. a asistir a la Conferencia:
>
> *“Laboratory modeling of Magma Emplacement in the Brittle Crust**�*
>
> Por el Doctor:
>
> *Olivier Galland*
>
> Universidad de Oslo, Oslo, Noruega
>
> *Lunes 1 de Abril de 2019 a las 11hs.*
>
> *Aula Aguirre del Depto. de Ciencias Geológicas, UBA*
>
>
> Resumen de la charla:
>
> The last decade or research highlighted that many sedimentary basins
> worldwide host voluminous igneous intrusive complexes, mostly flat-lying
> sills and laccoliths. These igneous intrusions have tremendous implications
> on the petroleum system through maturation, circulation and trapping of
> hydrocarbons.
>
>  In this contribution, we focus on the structural and mechanical
> implications of igneous intrusions on their sedimentary host rocks. When
> magma is intruded into sedimentary rocks, it makes its space by pushing and
> breaking the host rock, which can result in intense damage and fracturing.
> Understanding and quantifying the distribution of such intrusion-induced
> inelastic deformation pattern is essential to properly reveal the complex
> processes governing the emplacement of sills and laccoliths. However, most
> established models of sill and laccolith emplacement only account for
> elastic rocks that break in tension, so that they are unable to predict the
> distribution of fracture and damage around igneous intrusions due to the
> plasticity of natural rocks.
>
>  We investigated the effects of the brittle host rock cohesion on magma
> emplacement and resulting fracture and damage distribution through series
> of 3D and 2D scaled laboratory models. We show that high-cohesion host
> rock, results in the emplacement of thin, sheet intrusions (sills,
> cone-sheets). Conversely, low-cohesion host rock results in the emplacement
> of massive intrusions (laccoliths, plugs). The deformation patterns
> associated with sills and laccoliths are very different: fracturing and
> damage associated with sill emplacement is restricted at the close vicinity
> of the intrusion, whereas fracturing associated with laccolith emplacement
> affects the overburden of the intrusion on a much larger scale.
>
> In addition to the experimental approach, a series of numerical analyses
> have been performed to quantify the inelastic deformation and damage of the
> host rock near an overpressuried magmatic intrusion. Our results highlight
> the importance of rock heterogeneity in controlling the failure mechanism
> within the process zone of the system. By varying systematically the
> characteristic wave-length and amplitude of the heterogeneity (stochastic
> perturbation of the cohesion), we are able to show that localized dilatant
> shear failure may be the dominant mechanism at play within the process
> zone. For specific rock properties, the model result constrains the spatial
> extent of the process zone and allows an interpretation of the fault
> network orientation near the intrusion contact.
>
>
>

-- 
Este mensaje ha sido analizado por MailScanner
en busca de virus y otros contenidos peligrosos,
y se considera que está limpio.

------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: http://tango.gl.fcen.uba.ar/pipermail/geoinfo/attachments/20190329/22bbb4ed/attachment-0001.htm