Seismic reflection and petrographic interpretation of a buried monogenetic volcanic Field (part 1)

Bischoff, Alan; Rossetti, Marcos; Nicol, Andrew; Kennedy, Ben

doi:10.1007/s00445-019-1316-7

Cited by 14 publications

(19 citation statements)

References 55 publications

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“…Volcanoes of the MVS were imaged by high-quality 2D seismic lines and drilled by the Resolution-1 petroleum exploration well (Figure 1), which recovered a monzogabbro intrusion and correlative middle Miocene volcaniclastic rocks [41] (Figure 3). Volcanism in the MVS is estimated to have been active from 12.7 to 11.5 Ma [35]. The products of this volcanic activity are observed over an area of ca 1,520 km 2 , located 40 km SW and offshore of Banks Peninsula (Figure 1).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Eruptions in the MVS were short-lived and entirely submarine (500 to 1500 m in depth), controlled by a plumbing system that fed magma to disperse eruptive centres, which is common characteristic of monogenetic volcanic fields [38]. The magmatic products of MVS melts are primarily basaltic-alkaline in composition, and mainly produced the deep-water equivalents of tuff cones and maar-diatreme volcanoes [35,38] (Figure 3). After volcanism ceased, volcanoes located in a bathyal setting were buried and well preserved in the Canterbury Basin sedimentary strata, while higher volcanoes (> 200 m) located in a neritic setting were emergent at the paleo sea-surface and thus have had their tops flattened by erosional processes [38].…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Currently, few studies have been conducted aiming to characterise the complete architecture of buried monogenetic volcanic systems, including their plumbing system, eruptive deposits, and the sedimentary strata that enclose them [33,34]. Here, we adapt the approach presented in [6] for characterizing the architecture of polygenetic buried volcanic systems to unravel the complete architecture of the Maahunui Volcanic System (MVS), a submarine monogenetic volcanic field currently buried ca 1000 m in the offshore Canterbury Basin, New Zealand [35] (Figure 1). Interpretation of the diverse parts that together comprise the architecture of buried volcanic systems can provide valuable insights into how these ancient volcanoes formed and evolved in time and space [15,36].…”

Section: Introductionmentioning

confidence: 99%

“…Age of unconformities in the Resolution-1 well are: Oligocene-early Miocene (O-eM), early Miocene (eM), late Miocene (lM) and early Pliocene (eP). Modified from [35] after [43,46,136,137]. In the right side we show the water-depth variation from Cretaceous to Pleistocene at the location of the Resolution-1 borehole.…”

Section: Introductionmentioning

confidence: 99%

“…In the right side we show the water-depth variation from Cretaceous to Pleistocene at the location of the Resolution-1 borehole. [35,38].…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System

Bischoff¹,

Nicol²,

Cole³

et al. 2019

Preprint

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Large volumes of magma emplaced and deposited within sedimentary basins can have an impact on the architecture and geological evolution of these basins. Over the last decade, continuous improvement in techniques such as seismic volcano-stratigraphy and 3D visualisation of igneous bodies has helped increase knowledge about the architecture of volcanic systems buried in sedimentary basins. Here, we present the complete architecture of the Maahunui Volcanic System (MVS), a middle Miocene monogenetic volcanic field now buried in the offshore Canterbury Basin, South Island of New Zealand. We show the location, geometry, size, and stratigraphic relationships between 25 main intrusive, extrusive and sedimentary architectural elements, in a comprehensive volcano-stratigraphic framework that explains the evolution of the MVS from emplacement to complete burial in the host sedimentary basin. The plumbing system of the MVS comprises saucer-shaped sills, dikes and sill swarms, minor stocks and laccoliths, and pre-eruptive strata deformed by intrusions. The eruptive and associated sedimentary architectural elements define the morphology of volcanoes in the MVS, which comprise deep-water equivalents of crater and cone-type volcanoes. After volcanism ceased, the process of degradation and burial of volcanic edifices formed sedimentary architectural elements such as inter-cone plains, epiclastic plumes, and canyons. Understanding the relationships between these diverse architectural elements allows us to reconstruct the complete architecture of the MVS, including its shallow (<3 km) plumbing system, the morphology of the volcanoes, and their impact in the host sedimentary basin during their burial. Insights from the architecture of the MVS can be used to explore for geoenergy resources such as oil, gas and geothermal energy in buried and active monogenetic volcanic systems elsewhere.

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Section: Geological Backgroundmentioning

confidence: 99%