Skip to content

Research at St Andrews

Lateral magma flow in mafic sill complexes

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Standard

Lateral magma flow in mafic sill complexes. / Magee, Craig; Muirhead, James D.; Karvelas, Alex; Holford, Simon P.; Jackson, Christopher A. L.; Bastow, Ian D.; Schofield, Nick; Stevenson, Carl T. E.; McLean, Charlotte; McCarthy, William; Shtukert, Olga.

In: Geosphere, Vol. 12, No. 3, 06.2016, p. 809-841.

Research output: Contribution to journalArticle

Harvard

Magee, C, Muirhead, JD, Karvelas, A, Holford, SP, Jackson, CAL, Bastow, ID, Schofield, N, Stevenson, CTE, McLean, C, McCarthy, W & Shtukert, O 2016, 'Lateral magma flow in mafic sill complexes' Geosphere, vol. 12, no. 3, pp. 809-841. https://doi.org/10.1130/GES01256.1

APA

Magee, C., Muirhead, J. D., Karvelas, A., Holford, S. P., Jackson, C. A. L., Bastow, I. D., ... Shtukert, O. (2016). Lateral magma flow in mafic sill complexes. Geosphere, 12(3), 809-841. https://doi.org/10.1130/GES01256.1

Vancouver

Magee C, Muirhead JD, Karvelas A, Holford SP, Jackson CAL, Bastow ID et al. Lateral magma flow in mafic sill complexes. Geosphere. 2016 Jun;12(3):809-841. https://doi.org/10.1130/GES01256.1

Author

Magee, Craig ; Muirhead, James D. ; Karvelas, Alex ; Holford, Simon P. ; Jackson, Christopher A. L. ; Bastow, Ian D. ; Schofield, Nick ; Stevenson, Carl T. E. ; McLean, Charlotte ; McCarthy, William ; Shtukert, Olga. / Lateral magma flow in mafic sill complexes. In: Geosphere. 2016 ; Vol. 12, No. 3. pp. 809-841.

Bibtex - Download

@article{cbdbbbd8d1764c4eafbe613b01b9557f,
title = "Lateral magma flow in mafic sill complexes",
abstract = "The structure of upper crustal magma plumbing systems controls the distribution of volcanism and influences tectonic processes. However, delineating the structure and volume of plumbing systems is difficult because (1) active intrusion networks cannot be directly accessed; (2) field outcrops are commonly limited; and (3) geophysical data imaging the subsurface are restricted in areal extent and resolution. This has led to models involving the vertical transfer of magma via dikes, extending from a melt source to overlying reservoirs and eruption sites, being favored in the volcanic literature. However, while there is a wealth of evidence to support the occurrence of dike-dominated systems, we synthesize field-and seismic reflection-based observations and highlight that extensive lateral magma transport (as much as 4100 km) may occur within mafic sill complexes. Most of these mafic sill complexes occur in sedimentary basins (e.g., the Karoo Basin, South Africa), although some intrude crystalline continental crust (e.g., the Yilgarn craton, Australia), and consist of interconnected sills and inclined sheets. Sill complex emplacement is largely controlled by host-rock lithology and structure and the state of stress. We argue that plumbing systems need not be dominated by dikes and that magma can be transported within widespread sill complexes, promoting the development of volcanoes that do not overlie the melt source. However, the extent to which active volcanic systems and rifted margins are underlain by sill complexes remains poorly constrained, despite important implications for elucidating magmatic processes, melt volumes, and melt sources.",
keywords = "Large Igneous Province, Saucer-shaped sills, Main Ethiopian rift, Cone-sheet swarm, Long-distance transport, Faroe-Shetland basin, NE Atlantic margin, Torres-del-Paine, South China sea, Magnetic-susceptibility",
author = "Craig Magee and Muirhead, {James D.} and Alex Karvelas and Holford, {Simon P.} and Jackson, {Christopher A. L.} and Bastow, {Ian D.} and Nick Schofield and Stevenson, {Carl T. E.} and Charlotte McLean and William McCarthy and Olga Shtukert",
note = "This work was completed as part of Magee’s Junior Research Fellowship funded by Imperial College London. Muirhead acknowledges support from Fulbright New Zealand and the Ministry of Science and Innovation.",
year = "2016",
month = "6",
doi = "10.1130/GES01256.1",
language = "English",
volume = "12",
pages = "809--841",
journal = "Geosphere",
issn = "1553-040X",
publisher = "GEOLOGICAL SOC AMER, INC",
number = "3",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Lateral magma flow in mafic sill complexes

AU - Magee, Craig

AU - Muirhead, James D.

AU - Karvelas, Alex

AU - Holford, Simon P.

AU - Jackson, Christopher A. L.

AU - Bastow, Ian D.

AU - Schofield, Nick

AU - Stevenson, Carl T. E.

AU - McLean, Charlotte

AU - McCarthy, William

AU - Shtukert, Olga

N1 - This work was completed as part of Magee’s Junior Research Fellowship funded by Imperial College London. Muirhead acknowledges support from Fulbright New Zealand and the Ministry of Science and Innovation.

PY - 2016/6

Y1 - 2016/6

N2 - The structure of upper crustal magma plumbing systems controls the distribution of volcanism and influences tectonic processes. However, delineating the structure and volume of plumbing systems is difficult because (1) active intrusion networks cannot be directly accessed; (2) field outcrops are commonly limited; and (3) geophysical data imaging the subsurface are restricted in areal extent and resolution. This has led to models involving the vertical transfer of magma via dikes, extending from a melt source to overlying reservoirs and eruption sites, being favored in the volcanic literature. However, while there is a wealth of evidence to support the occurrence of dike-dominated systems, we synthesize field-and seismic reflection-based observations and highlight that extensive lateral magma transport (as much as 4100 km) may occur within mafic sill complexes. Most of these mafic sill complexes occur in sedimentary basins (e.g., the Karoo Basin, South Africa), although some intrude crystalline continental crust (e.g., the Yilgarn craton, Australia), and consist of interconnected sills and inclined sheets. Sill complex emplacement is largely controlled by host-rock lithology and structure and the state of stress. We argue that plumbing systems need not be dominated by dikes and that magma can be transported within widespread sill complexes, promoting the development of volcanoes that do not overlie the melt source. However, the extent to which active volcanic systems and rifted margins are underlain by sill complexes remains poorly constrained, despite important implications for elucidating magmatic processes, melt volumes, and melt sources.

AB - The structure of upper crustal magma plumbing systems controls the distribution of volcanism and influences tectonic processes. However, delineating the structure and volume of plumbing systems is difficult because (1) active intrusion networks cannot be directly accessed; (2) field outcrops are commonly limited; and (3) geophysical data imaging the subsurface are restricted in areal extent and resolution. This has led to models involving the vertical transfer of magma via dikes, extending from a melt source to overlying reservoirs and eruption sites, being favored in the volcanic literature. However, while there is a wealth of evidence to support the occurrence of dike-dominated systems, we synthesize field-and seismic reflection-based observations and highlight that extensive lateral magma transport (as much as 4100 km) may occur within mafic sill complexes. Most of these mafic sill complexes occur in sedimentary basins (e.g., the Karoo Basin, South Africa), although some intrude crystalline continental crust (e.g., the Yilgarn craton, Australia), and consist of interconnected sills and inclined sheets. Sill complex emplacement is largely controlled by host-rock lithology and structure and the state of stress. We argue that plumbing systems need not be dominated by dikes and that magma can be transported within widespread sill complexes, promoting the development of volcanoes that do not overlie the melt source. However, the extent to which active volcanic systems and rifted margins are underlain by sill complexes remains poorly constrained, despite important implications for elucidating magmatic processes, melt volumes, and melt sources.

KW - Large Igneous Province

KW - Saucer-shaped sills

KW - Main Ethiopian rift

KW - Cone-sheet swarm

KW - Long-distance transport

KW - Faroe-Shetland basin

KW - NE Atlantic margin

KW - Torres-del-Paine

KW - South China sea

KW - Magnetic-susceptibility

U2 - 10.1130/GES01256.1

DO - 10.1130/GES01256.1

M3 - Article

VL - 12

SP - 809

EP - 841

JO - Geosphere

T2 - Geosphere

JF - Geosphere

SN - 1553-040X

IS - 3

ER -

Related by author

  1. Structural signatures of igneous sheet intrusion propagation

    Magee, C., Muirhead, J., Schofield, N., Walker, R. J., Galland, O., Holford, S., Spacapan, J., Jackson, C. A-L. & McCarthy, W., Aug 2019, In : Journal of Structural Geology. 125, p. 148-154 7 p.

    Research output: Contribution to journalArticle

  2. Paleomagnetic, anisotropy of magnetic susceptibility, and geochronologic data from the Buena Vista intrusion, north-central New Mexico

    Petronis, M., Castillo, G., Lindline, J., Zebrowski, J., McCarthy, W., Lemen, D. & McIntosh, W., Dec 2015, Geology of the Las Vegas Region: Guidebook. Vol. 66. p. 193 204 p.

    Research output: Chapter in Book/Report/Conference proceedingChapter

  3. Distinguishing diapirs from inflated plutons: an integrated rock magnetic fabric and structural study on the Roundstone Pluton, western Ireland

    McCarthy, W., Petronis, M. S., Reavy, R. J. & Stevenson, C. T., Sep 2015, In : Journal of the Geological Society. 172, 5, p. 550-565 16 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Structural controls on fluid pathways in an active rift system: a case study of the Aluto volcanic complex

    Hutchison, W., Mather, T. A., Pyle, D. M., Biggs, J. & Yirgu, G., 1 Jun 2015, In : Geosphere. 11, 3, p. 542-562 21 p.

    Research output: Contribution to journalArticle

  2. Formation and transfer of stoped blocks into magma chambers: the high temperature interplay between focused porous flow, cracking, channel flow, and host rock anisotropy

    Paterson, S., Memeti, V., Pignotta, G., Erdmann, S., Žák, J., Chambers, J. & Ianno, A., 2012, In : Geosphere. 8, 2, p. 1-27 27 p.

    Research output: Contribution to journalArticle

ID: 245138583