Comment on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

McCarthy, David; Aldiss, Don; Arsenikos, S.; Stone, P.; Richards, P. C.

doi:10.1111/ter.12285

Cited by 9 publications

(11 citation statements)

References 28 publications

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“…The lack of evidence of a basin in the interpretation by McCarthy et al. () of seismic section SGF193‐100, which crosses the proposed structure, is puzzling. What could be causing the large negative gravity anomaly?…”

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confidence: 91%

“…Interpretations of the low‐resolution seismic sections are not unique (M. Rebolledo‐Vieyra, personal communication). When our accidental reversal of the seismic section SGF193‐117 is corrected, it shows the sediments actually thickening into the Malvinas Basin (Richards, Gatliff, Quinn, Williamson, & Fannin, ; Urien & Zambrano, ) to the south of the gravity/magnetic geophysical anomaly (McCarthy et al., ). Richards et al.…”

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confidence: 99%

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Reply to Comments on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

2017

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confidence: 91%

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confidence: 99%

Reply to Comments on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

2017

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“…The other, highly sceptical, commentary by McCarthy et al. () challenged both the presentation and the interpretation of the single seismic profile interpreted by Rocca et al. () by analyzing it in a regional geologic setting.…”

Section: Discussionmentioning

confidence: 99%

“…However, several issues have led to the present discourse and potential misinterpretations (McCarthy et al. ; Rampino et al. ; Reimold et al.…”

Section: Malvinas Structurementioning

confidence: 99%

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Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters

Tsikalas

Eldholm

2018

Meteorit & Planetary Scien

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A diagnostic geophysical‐based template, supported by modelling, is suggested to be used prior to, or in combination with geological/drilling data, when proposing a marine impact crater. The latter refers to impacts occurring in a marine setting and resulting in structures that are currently partially or totally underwater. The methodology is based on the well‐documented Mjølnir crater in the Barents Sea. The template has been developed in conjunction with the recently proposed and debated impact crater on the Malvinas (Falkland) Plateau in the South Atlantic. Despite their different sizes, their comparison adds to the ambiguous nature of the Malvinas structure and shows that the integrated analysis of seismic and potential field data and modelling is crucial for any interpretation of a marine impact crater without relevant geological information. The proposed workflow template utilizes all available geophysical data and is composed of a series of iterative steps, including a range of alternative nonimpact interpretations that must be discussed and accounted for. Subsequently, further iterative geophysical modelling is required to support and decipher the impact related processes. A more complex impact crater model and additional impact crater features can be resolved by physical property modelling. In all cases, a close spatial correspondence of the defined impact structure with potential field anomalies is a necessity to establish a causal relationship. We suggest that the diagnostic workflow template provides a methodology to be applied to future studies of the Malvinas structure, as well as to proposed marine (and, with minor adaptions, to nonmarine) impact craters in general.

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Impact cratering: The South American record – Part 1

et al. 2019

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Comment on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

Cited by 9 publications

References 28 publications

Reply to Comments on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

Reply to Comments on “Geophysical evidence for a large impact structure on the Falkland (Malvinas) Plateau”

Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters

Impact cratering: The South American record – Part 1

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