Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin
The Brazilian Equatorial Margin (BEM) is a transform passive margin with long fracture zones and several seamounts, including the largest one, the Ceará Plateau (CP). This is a complex and poorly studied area, with few available geophysical data. Gravity and magnetic data from the Equant I Project,...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2019-12-01
|
| Series: | Frontiers in Earth Science |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/feart.2019.00309/full |
| _version_ | 1818038558337794048 |
|---|---|
| author | Denise Silva de Moura Denise Silva de Moura Eder Cassola Molina Yara Regina Marangoni Luigi Jovane |
| author_facet | Denise Silva de Moura Denise Silva de Moura Eder Cassola Molina Yara Regina Marangoni Luigi Jovane |
| author_sort | Denise Silva de Moura |
| collection | DOAJ |
| description | The Brazilian Equatorial Margin (BEM) is a transform passive margin with long fracture zones and several seamounts, including the largest one, the Ceará Plateau (CP). This is a complex and poorly studied area, with few available geophysical data. Gravity and magnetic data from the Equant I Project, seismic published lines and other previous studies are used to make several models and analyses. We related the basement, internally comprised of two magmatic highs, to gravity and magnetic anomalies since there are a positive density and susceptibility contrast between sedimentary and basement rocks. Through gravity and magnetic forward modeling, we estimated the basement surface between 800 and 6000 m and the Mohorovičić discontinuity about 22–23 km below the CP. We also present and discuss the position of the continent-ocean boundary 40 km away from the continental shelf, placing the plateau at the oceanic crust domain, and the area of the transitional crust, with an extension of 40–50 km, formed during the rifting phase of the Atlantic Ocean opening. |
| first_indexed | 2024-12-10T07:44:39Z |
| format | Article |
| id | doaj.art-4d168252d8544c3b931cffc866575a80 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-10T07:44:39Z |
| publishDate | 2019-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-4d168252d8544c3b931cffc866575a802022-12-22T01:57:14ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632019-12-01710.3389/feart.2019.00309489124Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial MarginDenise Silva de Moura0Denise Silva de Moura1Eder Cassola Molina2Yara Regina Marangoni3Luigi Jovane4Instituto Oceanográfico, Universidade de São Paulo, São Paulo, BrazilInstituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, BrazilInstituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, BrazilInstituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, BrazilInstituto Oceanográfico, Universidade de São Paulo, São Paulo, BrazilThe Brazilian Equatorial Margin (BEM) is a transform passive margin with long fracture zones and several seamounts, including the largest one, the Ceará Plateau (CP). This is a complex and poorly studied area, with few available geophysical data. Gravity and magnetic data from the Equant I Project, seismic published lines and other previous studies are used to make several models and analyses. We related the basement, internally comprised of two magmatic highs, to gravity and magnetic anomalies since there are a positive density and susceptibility contrast between sedimentary and basement rocks. Through gravity and magnetic forward modeling, we estimated the basement surface between 800 and 6000 m and the Mohorovičić discontinuity about 22–23 km below the CP. We also present and discuss the position of the continent-ocean boundary 40 km away from the continental shelf, placing the plateau at the oceanic crust domain, and the area of the transitional crust, with an extension of 40–50 km, formed during the rifting phase of the Atlantic Ocean opening.https://www.frontiersin.org/article/10.3389/feart.2019.00309/fullCeará PlateauBrazilian Equatorial Margingravity modelingmagnetic modelingcrustal structure |
| spellingShingle | Denise Silva de Moura Denise Silva de Moura Eder Cassola Molina Yara Regina Marangoni Luigi Jovane Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin Frontiers in Earth Science Ceará Plateau Brazilian Equatorial Margin gravity modeling magnetic modeling crustal structure |
| title | Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin |
| title_full | Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin |
| title_fullStr | Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin |
| title_full_unstemmed | Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin |
| title_short | Gravity and Magnetic Constraints on the Crustal Structure of the Ceará Plateau, Brazilian Equatorial Margin |
| title_sort | gravity and magnetic constraints on the crustal structure of the ceara plateau brazilian equatorial margin |
| topic | Ceará Plateau Brazilian Equatorial Margin gravity modeling magnetic modeling crustal structure |
| url | https://www.frontiersin.org/article/10.3389/feart.2019.00309/full |
| work_keys_str_mv | AT denisesilvademoura gravityandmagneticconstraintsonthecrustalstructureofthecearaplateaubrazilianequatorialmargin AT denisesilvademoura gravityandmagneticconstraintsonthecrustalstructureofthecearaplateaubrazilianequatorialmargin AT edercassolamolina gravityandmagneticconstraintsonthecrustalstructureofthecearaplateaubrazilianequatorialmargin AT yarareginamarangoni gravityandmagneticconstraintsonthecrustalstructureofthecearaplateaubrazilianequatorialmargin AT luigijovane gravityandmagneticconstraintsonthecrustalstructureofthecearaplateaubrazilianequatorialmargin |