Reynolds, P. and Schofield, N. and Brown, R.J. and Holford, S.P. (2018) 'The architecture of submarine monogenetic volcanoes – insights from 3D seismic data.', Basin research., 30 (s1). pp. 437-451.
Many prospective sedimentary basins contain a variety of extrusive volcanic products that are ultimately sourced from volcanoes. However, seismic reflection-based studies of magmatic rift basins have tended to focus on the underlying magma plumbing system, meaning that the seismic characteristics of volcanoes are not well understood. Additionally, volcanoes have similar morphologies to hydrothermal vents, which are also linked to underlying magmatic intrusions. In this study, we use high resolution 3D seismic and well data from the Bass Basin, offshore southern Australia, to document 34 cone- and crater-type vents of Miocene age. The vents overlie magmatic intrusions and have seismic properties indicative of a volcanic origin: their moderate–high amplitude upper reflections and zones of “wash-out” and velocity pull-up beneath. The internal reflections of the vents are similar to those found in lava deltas, suggesting they are composed of volcaniclastic material. This interpretation is corroborated by data from exploration wells which penetrated the flanks of several vents. We infer that the vents we describe are composed of hyaloclastite and pyroclasts produced during submarine volcanic eruptions. The morphology of the vents is typical of monogenetic volcanoes, consistent with the onshore record of volcanism on the southern Australian margin. Based on temporal, spatial and volumetric relationships, we propose that submarine volcanoes can evolve from maars to tuff cones as a result of varying magma-water interaction efficiency. The morphologies of the volcanoes and their links to the underlying feeder systems are superficially similar to hydrothermal vents. This highlights the need for careful seismic interpretation and characterization of vent structures linked to magmatic intrusions within sedimentary basins.
|Full text:||(AM) Accepted Manuscript|
Download PDF (18703Kb)
|Publisher Web site:||https://doi.org/10.1111/bre.12230|
|Publisher statement:||This is the accepted version of the following article: Reynolds, P., Schofield, N., Brown, R.J. & Holford, S.P. (2018). The architecture of submarine monogenetic volcanoes – insights from 3D seismic data. Basin Research 30(S1): 437-451 which has been published in final form at https://doi.org/10.1111/bre.12230. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.|
|Date accepted:||16 December 2016|
|Date deposited:||07 February 2017|
|Date of first online publication:||20 January 2017|
|Date first made open access:||20 January 2018|
Save or Share this output
|Look up in GoogleScholar|