Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters
Abstract 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 currentl...
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Online Access: | http://dx.doi.org/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13227 |
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crwiley:10.1111/maps.13227 2024-09-30T14:32:54+00:00 Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters Tsikalas, F. Eldholm, O. 2018 http://dx.doi.org/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13227 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 54, issue 3, page 544-557 ISSN 1086-9379 1945-5100 journal-article 2018 crwiley https://doi.org/10.1111/maps.13227 2024-09-03T04:22:48Z Abstract 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. Article in Journal/Newspaper Barents Sea Wiley Online Library Barents Sea Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Meteoritics & Planetary Science 54 3 544 557 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Tsikalas, F. Eldholm, O. |
spellingShingle |
Tsikalas, F. Eldholm, O. Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
author_facet |
Tsikalas, F. Eldholm, O. |
author_sort |
Tsikalas, F. |
title |
Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
title_short |
Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
title_full |
Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
title_fullStr |
Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
title_full_unstemmed |
Malvinas (Falkland) Plateau structure versus Mjølnir crater: Geophysical workflow template for proposed marine impact craters |
title_sort |
malvinas (falkland) plateau structure versus mjølnir crater: geophysical workflow template for proposed marine impact craters |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.13227 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13227 |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) |
geographic |
Barents Sea Falkland Plateau |
geographic_facet |
Barents Sea Falkland Plateau |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
Meteoritics & Planetary Science volume 54, issue 3, page 544-557 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.13227 |
container_title |
Meteoritics & Planetary Science |
container_volume |
54 |
container_issue |
3 |
container_start_page |
544 |
op_container_end_page |
557 |
_version_ |
1811636956816211968 |