2021
DOI: 10.1016/j.margeo.2021.106538
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Post-rift magmatism and hydrothermal activity in the central offshore Otway Basin and implications for igneous plumbing systems

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Cited by 9 publications
(4 citation statements)
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“…Similar evidence on the detailed imaging of plumbing systems is discussed with examples from the southeast Australian Margin and the Faroe‐Shetland region (McLean et al, 2017; Niyazi, Eruteya, et al, 2021; Niyazi et al, 2021). Accounting for the position of the sills in relation with the volcanic edifice and any controls from structural inheritance (Barrier et al, 2021; McLean et al, 2017; Niyazi, Warne, et al, 2021), these igneous features are interpreted to be associated with underlying syn‐rift faults; these faults probably acted as conduits for magma ascension to its final position within a pre‐volcanic sequence (dominantly unit 5b) and in some cases, extruding to surface and contributing to the build‐up of the volcanic edifice (Figure 4). Another relevant aspect of sills in the vicinity of the ESI is the similarity to what is observed around the Sintra massif (Figure 6d,e) (Alves, 1964; Ramalho et al, 1993; Sparks & Wadge, 1975).…”
Section: Discussionsupporting
confidence: 58%
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“…Similar evidence on the detailed imaging of plumbing systems is discussed with examples from the southeast Australian Margin and the Faroe‐Shetland region (McLean et al, 2017; Niyazi, Eruteya, et al, 2021; Niyazi et al, 2021). Accounting for the position of the sills in relation with the volcanic edifice and any controls from structural inheritance (Barrier et al, 2021; McLean et al, 2017; Niyazi, Warne, et al, 2021), these igneous features are interpreted to be associated with underlying syn‐rift faults; these faults probably acted as conduits for magma ascension to its final position within a pre‐volcanic sequence (dominantly unit 5b) and in some cases, extruding to surface and contributing to the build‐up of the volcanic edifice (Figure 4). Another relevant aspect of sills in the vicinity of the ESI is the similarity to what is observed around the Sintra massif (Figure 6d,e) (Alves, 1964; Ramalho et al, 1993; Sparks & Wadge, 1975).…”
Section: Discussionsupporting
confidence: 58%
“…), as well as dimming of seismic data along with upward bending reflections underlying the Fontanelas volcano, as part of the wider plumbing system (Figures 3, 5 and 9). Similar evidence on the detailed imaging of plumbing systems is discussed with examples from the southeast Australian Margin and the Faroe‐Shetland region (McLean et al, 2017; Niyazi, Eruteya, et al, 2021; Niyazi et al, 2021). Accounting for the position of the sills in relation with the volcanic edifice and any controls from structural inheritance (Barrier et al, 2021; McLean et al, 2017; Niyazi, Warne, et al, 2021), these igneous features are interpreted to be associated with underlying syn‐rift faults; these faults probably acted as conduits for magma ascension to its final position within a pre‐volcanic sequence (dominantly unit 5b) and in some cases, extruding to surface and contributing to the build‐up of the volcanic edifice (Figure 4).…”
Section: Discussionsupporting
confidence: 58%
“…This results in the final eruption of magma onto the paleo-seabed to form the extrusive edifices interpreted in this study . Thick sedimentary sequences, when present, may generate high overburden pressures, which deviate the sub-vertical propagation of magma and favor the formation of sill-dominated igneous plumbing systems, e.g., offshore Otway Basin (Niyazi et al 2021b) and the Qiongdongnan Basin (Sun et al, 2022). The thickness of strata and the relative size of intrusions thus influence the shapes of sills and the generation of associated folds above them.…”
Section: Magma Emplacement Systems In the Baiyun Sagmentioning
confidence: 99%
“…Because there are no borehole samples available from the interpreted ca. 49-21 Myr old gas chimney, pockmark, or free gas anomalies, we cannot ascertain the composition of the fluids involved in their formation, but we consider three possible origins: (1) hydrothermal fluids CO 2 ) related to activity, perhaps similar to those that may have M1-M4 if they are hydrothermal vents (Niyazi et al, 2021;Sharma & Srivastava, 2014); (2) hydrocarbons generated from source rocks of the Hoiho Group (Killops et al, 1997;Omosanya & Harishidayat, 2019;Shalaby et al, 2019); or (3) a mixture of the above-mentioned two sources. With regard to hydrothermal activity, we note that there was a regional reduction in magmatic activity during tectonic quiescence between 66 and 30 Ma (Bischoff et al, 2020).…”
Section: Reutilization Of Fluid Escape Structuresmentioning
confidence: 99%