Structural signatures of igneous sheet intrusion propagation

The geometry and distribution of planar igneous bodies (i.e. sheet intrusions), such as dykes, sills, and inclined sheets, has long been used to determine emplacement mechanics, define melt source locations, and reconstruct palaeostress conditions to shed light on various tectonic and magmatic proce...

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Autores principales: Magee, Craig, Muirhead, James D., Schofield, Nick, Walker, Richard, Galland, Olivier, Holford, Simon P., Spacapan, Juan Bautista, Jackson, Christopher A. L., McCarthy, William
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Naturales
Geología
Magma
Sheet intrusion
Dyke
Sill
Flow
Structure
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124474
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124474
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Geología
Magma
Sheet intrusion
Dyke
Sill
Flow
Structure
spellingShingle Ciencias Naturales
Geología
Magma
Sheet intrusion
Dyke
Sill
Flow
Structure
Magee, Craig
Muirhead, James D.
Schofield, Nick
Walker, Richard
Galland, Olivier
Holford, Simon P.
Spacapan, Juan Bautista
Jackson, Christopher A. L.
McCarthy, William
Structural signatures of igneous sheet intrusion propagation
topic_facet Ciencias Naturales
Geología
Magma
Sheet intrusion
Dyke
Sill
Flow
Structure
description The geometry and distribution of planar igneous bodies (i.e. sheet intrusions), such as dykes, sills, and inclined sheets, has long been used to determine emplacement mechanics, define melt source locations, and reconstruct palaeostress conditions to shed light on various tectonic and magmatic processes. Since the 1970’s we have recognised that sheet intrusions do not necessarily display a continuous, planar geometry, but commonly consist of segments. The morphology of these segments and their connectors is controlled by, and provide insights into, the behaviour of the host rock during emplacement. For example, tensile brittle fracturing leads to the formation of intrusive steps or bridge structures between adjacent segments. In contrast, brittle shear faulting, cataclastic and ductile flow processes, as well as heat-induced viscous flow or fluidization, promotes magma finger development. Textural indicators of magma flow (e.g., rock fabrics) reveal that segments are aligned parallel to the initial sheet propagation direction. Recognising and mapping segment long axes thus allows melt source location hypotheses, derived from sheet distribution and orientation, to be robustly tested. Despite the information that can be obtained from these structural signatures of sheet intrusion propagation, they are largely overlooked by the structural and volcanological communities. To highlight their utility, we briefly review the formation of sheet intrusion segments, discuss how they inform interpretations of magma emplacement, and outline future research directions.
format Articulo
Preprint
author Magee, Craig
Muirhead, James D.
Schofield, Nick
Walker, Richard
Galland, Olivier
Holford, Simon P.
Spacapan, Juan Bautista
Jackson, Christopher A. L.
McCarthy, William
author_facet Magee, Craig
Muirhead, James D.
Schofield, Nick
Walker, Richard
Galland, Olivier
Holford, Simon P.
Spacapan, Juan Bautista
Jackson, Christopher A. L.
McCarthy, William
author_sort Magee, Craig
title Structural signatures of igneous sheet intrusion propagation
title_short Structural signatures of igneous sheet intrusion propagation
title_full Structural signatures of igneous sheet intrusion propagation
title_fullStr Structural signatures of igneous sheet intrusion propagation
title_full_unstemmed Structural signatures of igneous sheet intrusion propagation
title_sort structural signatures of igneous sheet intrusion propagation
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/124474
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