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@article{Magee:2013:10.1016/j.epsl.2013.04.041,
author = {Magee, C and Hunt-Stewart, E and Jackson, CAL},
doi = {10.1016/j.epsl.2013.04.041},
journal = {Earth and Planetary Science Letters},
pages = {41--53},
title = {Volcano growth mechanisms and the role of sub-volcanic intrusions: Insights from 2D seismic reflection data},
url = {http://dx.doi.org/10.1016/j.epsl.2013.04.041},
volume = {373},
year = {2013}
}
TY - JOUR
AB - Temporal and spatial changes in volcano morphology and internal architecture can determine eruption style and location. However, the relationship between the external and internal characteristics of volcanoes and sub-volcanic intrusions is often difcult to observe at outcrop or interpret uniquely from geophysical and geodetic data. We use high-quality 2D seismic reection data from the Ceduna Sub-basin, offshore southern Australia, to quantitatively analyse 56, pristinely-preserved, Eocene-age volcanogenic mounds, and a genetically-related network of sub-volcanic sills and laccoliths. Detailed seismic mapping has allowed the 3D geometry of each mound to be reconstructed and distinct seismic facies within them to be recognised. Forty-six continental, basaltic shield volcanoes have been identied that have average ank dips of <10.31, basal diameters of 1.94–18.89 km, central summits that are 0.02–1 km high and volumes that range from 0.06 to 57.21 km3. Parallel seismic reections within the shield volcanoes are interpreted to represent interbedded volcanic and clastic material, suggesting that a series of temporally separate eruptions emanated from a central vent. The shield volcanoes typically overlie the lateral tips of sills and we suggest that the intermittent eruption phases correspond to the incremental emplacement of discrete magma pulses within the laterally extensive sill-complex. Eight volcanogenic hydrothermal vents, which are also associated with the lateral tips of sills, were also recognised, and these appear to have formed from the seepage of intrusion-related hydrothermal uids onto the seaoor via emplacement-induced fractures. This work highlights that deformation patterns preceding volcanic eruptions may (i) be offset from the eruption site; (ii) attributed to intrusions with complex morphologies; and/or (iii) reect magma movement along pre-existing fracture systems. These complexities should therefore be considered in erupt
AU - Magee,C
AU - Hunt-Stewart,E
AU - Jackson,CAL
DO - 10.1016/j.epsl.2013.04.041
EP - 53
PY - 2013///
SP - 41
TI - Volcano growth mechanisms and the role of sub-volcanic intrusions: Insights from 2D seismic reflection data
T2 - Earth and Planetary Science Letters
UR - http://dx.doi.org/10.1016/j.epsl.2013.04.041
UR - http://www.sciencedirect.com/science/article/pii/S0012821X13002367
VL - 373
ER -