Tara Stephens
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View article: High Impedance Mudstone Associated With Sand Injection Complexes: Significance for Basin‐Scale Fluid Retention and Escape
High Impedance Mudstone Associated With Sand Injection Complexes: Significance for Basin‐Scale Fluid Retention and Escape Open
High impedance (hard) mudstones are sometimes observed in association with sand injection complexes in the Paleogene petroleum province of the northern North Sea. A hard mudstone surrounding a water‐bearing sandstone can give a similar aco…
View article: Segment tip geometry of sheet intrusions: a dynamic model for the evolving conditions of emplacement
Segment tip geometry of sheet intrusions: a dynamic model for the evolving conditions of emplacement Open
<p>Magmatic sheet intrusions are commonly segmented, across multiple scales, with preserved segments typically interpreted as representing an early stage of intrusion growth. Intrusion propagation has long been associated with linear…
View article: Segment tip geometry of sheet intrusions, II: Field observations of tip geometries and a model for evolving emplacement mechanisms
Segment tip geometry of sheet intrusions, II: Field observations of tip geometries and a model for evolving emplacement mechanisms Open
Igneous sheet intrusions are segmented across several orders of magnitude, with segment tip geometry commonly considered indicative of the propagation mechanism (brittle or non-brittle). Proposed propagation mechanisms are inferred to repr…
View article: Segment tip geometry of sheet intrusions, I: Theory and numerical models for the role of tip shape in controlling propagation pathways
Segment tip geometry of sheet intrusions, I: Theory and numerical models for the role of tip shape in controlling propagation pathways Open
Inferences about sheet intrusion emplacement mechanisms have been built largely on field observations of intrusion tip zones: magmatic systems that did not grow beyond their observed state. Here we use finite element simulation of elliptic…
View article: No demonstrated link between sea-level and eruption history at Santorini
No demonstrated link between sea-level and eruption history at Santorini Open
Previous studies have suggested a link between rates of sea-level variation and eruptions globally [McGuire et al., 1997], with Satow and coauthors [2021] presenting the first detailed comparison between sea-level change and eruptive histo…
View article: Segment tip geometry of sheet intrusions, I: Theory and numerical models for the role of tip shape in controlling propagation pathways.
Segment tip geometry of sheet intrusions, I: Theory and numerical models for the role of tip shape in controlling propagation pathways. Open
Inferences about sheet intrusion emplacement mechanisms have been built largely on field observations of intrusion tip zones: magmatic systems that did not grow beyond their observed state. Here we use finite element simulation of elliptic…
View article: Segment tip geometry of sheet intrusions, II: Field observations of tip geometries and a model for evolving emplacement mechanisms
Segment tip geometry of sheet intrusions, II: Field observations of tip geometries and a model for evolving emplacement mechanisms Open
Igneous sheet intrusions are segmented across several orders of magnitude, with segment tip geometry commonly considered indicative of the propagation mechanism (brittle or non-brittle). Proposed propagation mechanisms are inferred to repr…
View article: Are sills a record of applied horizontal compression?
Are sills a record of applied horizontal compression? Open
Igneous sills represent an important component of the deformation history in volcanic settings, yet palaeostress analyses in volcanic regions focus only on dykes. The close spatial relationship between sills and dykes in layered host rocks…
View article: Mechanical models to estimate the paleostress state from igneous intrusions
Mechanical models to estimate the paleostress state from igneous intrusions Open
Dikes and sills represent an important component of the deformation history in volcanic systems, but unlike dikes, sills are typically omitted from traditional paleostress analyses in tectonic studies. The emplacement of sheet intrusions i…
View article: Mechanical models to estimate the paleostress state fromigneous intrusions
Mechanical models to estimate the paleostress state fromigneous intrusions Open
Dikes and sills represent an important component of the deformation history in volcanic systems, but unlike dikes, sills are typically omitted from traditional paleostress analyses in tectonic studies. The emplacement of sheet intrusions i…
View article: Mechanical models to estimate the paleostress state from igneous intrusions
Mechanical models to estimate the paleostress state from igneous intrusions Open
Dikes and sills represent an important component of the deformation history in volcanic systems, but unlike dikes, sills are typically omitted from traditional paleostress analyses in tectonic studies. The emplacement of sheet intrusions i…
View article: Igneous sills record far-field and near-field stress interactions during volcano construction: Isle of Mull, Scotland
Igneous sills record far-field and near-field stress interactions during volcano construction: Isle of Mull, Scotland Open
Sill emplacement is typically associated with horizontally mechanically layered host rocks in a near-hydrostatic far-field stress state, where contrasting mechanical properties across the layers promote transitions from dykes, or inclined …
View article: Igneous sills as a record of horizontal shortening: The San Rafael subvolcanic field, Utah
Igneous sills as a record of horizontal shortening: The San Rafael subvolcanic field, Utah Open
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