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Salt tectonics of the offshore Tarfaya Basin, Moroccan Atlantic margin
Salt tectonics play a critical role on passive margins evolution controlling aspects like structural style, subsidence patterns and thermal history, amongst others. The salt-bearing Atlantic passive margin of Morocco hosts one of the oldest stratigraphic records documenting the opening history of th...
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Published in: | Marine and petroleum geology 2022-04, Vol.138, p.105521, Article 105521 |
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description | Salt tectonics play a critical role on passive margins evolution controlling aspects like structural style, subsidence patterns and thermal history, amongst others. The salt-bearing Atlantic passive margin of Morocco hosts one of the oldest stratigraphic records documenting the opening history of the Central Atlantic. However, the available seismic data is scarce and some offshore basins are still poorly studied, particularly in southern Morocco. Through the interpretation of an unpublished 2D/3D seismic dataset from the offshore Tarfaya Basin (SW Morocco), this study aims to highlight the key events that conditioned the evolution of this salt-bearing basin. From proximal to distal regions, the structural style of the basin is characterized by expulsion rollovers and salt-cored anticlines delimited by primary welded surfaces, evolving to buried salt sheets surrounded by thick minibasins and finally, diapirs actively deforming the modern seabed. From Late Triassic to Early Jurassic times, salt was deposited with a basinward thickening wedge-shaped geometry on a narrow trough developed over thinned continental crust. During the Jurassic, sedimentation and associated salt withdrawal triggered early salt deformation. Gravity gliding is a common process in salt-bearing passive margins that requires an originally continuous autochthonous salt layer with a minimum slope angle and longitude to thickness ratio of the overburden. However, in the Tarfaya Basin, the narrow geometry of the salt-bearing depocenter hampered this process. Early salt tectonics was probably triggered by slope progradation during the Early Jurassic. During the Early Cretaceous, the progradation of the Tan-Tan Delta promoted a continued basinward expulsion of salt, the development of a local salt-detached gravitational system and the proximal extrusion of salt sheets. Finally, from Late Cretaceous to the Present-day, shortening related to the convergence between Africa and Eurasia resulted in thick-skin inversion and the rejuvenation of precursor salt structures.
•Unpublished 2D and 3D seismic data from the salt-bearing offshore Tarfaya Basin (NW Africa) is presented.•Seismic interpretation and sequential structural restoration were carried out to understand the evolution of salt structures.•Salt was deposited on a narrow rifted margin over thinned continental crust during the syn-thinning stage.•Gravity gliding was hampered by the narrowness of the basin. Progradational loading triggered bas |
doi_str_mv | 10.1016/j.marpetgeo.2021.105521 |
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•Unpublished 2D and 3D seismic data from the salt-bearing offshore Tarfaya Basin (NW Africa) is presented.•Seismic interpretation and sequential structural restoration were carried out to understand the evolution of salt structures.•Salt was deposited on a narrow rifted margin over thinned continental crust during the syn-thinning stage.•Gravity gliding was hampered by the narrowness of the basin. Progradational loading triggered basinward salt withdrawal.•From Late Cretaceous to Cenozoic times, orogenic shortening caused diapir rejuvenation and promoted secondary welding.</description><identifier>ISSN: 0264-8172</identifier><identifier>EISSN: 1873-4073</identifier><identifier>DOI: 10.1016/j.marpetgeo.2021.105521</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Basin evolution ; Central atlantic ; Morocco ; Rifted passive margins ; Salt tectonics ; Tarfaya basin</subject><ispartof>Marine and petroleum geology, 2022-04, Vol.138, p.105521, Article 105521</ispartof><rights>2022 The Authors</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a387t-2e32a8275b50c794caa588be89ba6ffa0c6993c0f2295dd43dd904dbd0f541473</citedby><cites>FETCH-LOGICAL-a387t-2e32a8275b50c794caa588be89ba6ffa0c6993c0f2295dd43dd904dbd0f541473</cites><orcidid>0000-0003-2540-3650 ; 0000-0002-4552-9106 ; 0000-0003-3477-0321</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Uranga, Rodolfo M.</creatorcontrib><creatorcontrib>Ferrer, Oriol</creatorcontrib><creatorcontrib>Zamora, Gonzalo</creatorcontrib><creatorcontrib>Muñoz, Josep A.</creatorcontrib><creatorcontrib>Rowan, Mark G.</creatorcontrib><title>Salt tectonics of the offshore Tarfaya Basin, Moroccan Atlantic margin</title><title>Marine and petroleum geology</title><description>Salt tectonics play a critical role on passive margins evolution controlling aspects like structural style, subsidence patterns and thermal history, amongst others. The salt-bearing Atlantic passive margin of Morocco hosts one of the oldest stratigraphic records documenting the opening history of the Central Atlantic. However, the available seismic data is scarce and some offshore basins are still poorly studied, particularly in southern Morocco. Through the interpretation of an unpublished 2D/3D seismic dataset from the offshore Tarfaya Basin (SW Morocco), this study aims to highlight the key events that conditioned the evolution of this salt-bearing basin. From proximal to distal regions, the structural style of the basin is characterized by expulsion rollovers and salt-cored anticlines delimited by primary welded surfaces, evolving to buried salt sheets surrounded by thick minibasins and finally, diapirs actively deforming the modern seabed. From Late Triassic to Early Jurassic times, salt was deposited with a basinward thickening wedge-shaped geometry on a narrow trough developed over thinned continental crust. During the Jurassic, sedimentation and associated salt withdrawal triggered early salt deformation. Gravity gliding is a common process in salt-bearing passive margins that requires an originally continuous autochthonous salt layer with a minimum slope angle and longitude to thickness ratio of the overburden. However, in the Tarfaya Basin, the narrow geometry of the salt-bearing depocenter hampered this process. Early salt tectonics was probably triggered by slope progradation during the Early Jurassic. During the Early Cretaceous, the progradation of the Tan-Tan Delta promoted a continued basinward expulsion of salt, the development of a local salt-detached gravitational system and the proximal extrusion of salt sheets. Finally, from Late Cretaceous to the Present-day, shortening related to the convergence between Africa and Eurasia resulted in thick-skin inversion and the rejuvenation of precursor salt structures.
•Unpublished 2D and 3D seismic data from the salt-bearing offshore Tarfaya Basin (NW Africa) is presented.•Seismic interpretation and sequential structural restoration were carried out to understand the evolution of salt structures.•Salt was deposited on a narrow rifted margin over thinned continental crust during the syn-thinning stage.•Gravity gliding was hampered by the narrowness of the basin. Progradational loading triggered basinward salt withdrawal.•From Late Cretaceous to Cenozoic times, orogenic shortening caused diapir rejuvenation and promoted secondary welding.</description><subject>Basin evolution</subject><subject>Central atlantic</subject><subject>Morocco</subject><subject>Rifted passive margins</subject><subject>Salt tectonics</subject><subject>Tarfaya basin</subject><issn>0264-8172</issn><issn>1873-4073</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNqFkMtKAzEUhoMoWKvPYB7AqSeZySSzrMWqUHFhXYczubQpdVKSIPTtHam4dfXDgf9yPkJuGcwYsPZ-N_vEdHBl4-KMA2fjVQjOzsiEKVlXDcj6nEyAt02lmOSX5CrnHQDIDtiELN9xX2hxpsQhmEyjp2XrRvF5G5Oja0wej0gfMIfhjr7GFI3Bgc7LHocSDB3LN2G4Jhce99nd_OqUfCwf14vnavX29LKYryqslSwVdzVHxaXoBRjZNQZRKNU71fXYeo9g2q6rDXjOO2FtU1vbQWN7C140rJH1lMhTrkkx5-S8PqQwTjhqBvoHh97pPxz6B4c-4Rid85PTjfO-gks6m-AG42xI4_faxvBvxjckB21T</recordid><startdate>202204</startdate><enddate>202204</enddate><creator>Uranga, Rodolfo M.</creator><creator>Ferrer, Oriol</creator><creator>Zamora, Gonzalo</creator><creator>Muñoz, Josep A.</creator><creator>Rowan, Mark G.</creator><general>Elsevier Ltd</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><orcidid>https://orcid.org/0000-0003-2540-3650</orcidid><orcidid>https://orcid.org/0000-0002-4552-9106</orcidid><orcidid>https://orcid.org/0000-0003-3477-0321</orcidid></search><sort><creationdate>202204</creationdate><title>Salt tectonics of the offshore Tarfaya Basin, Moroccan Atlantic margin</title><author>Uranga, Rodolfo M. ; Ferrer, Oriol ; Zamora, Gonzalo ; Muñoz, Josep A. ; Rowan, Mark G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a387t-2e32a8275b50c794caa588be89ba6ffa0c6993c0f2295dd43dd904dbd0f541473</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Basin evolution</topic><topic>Central atlantic</topic><topic>Morocco</topic><topic>Rifted passive margins</topic><topic>Salt tectonics</topic><topic>Tarfaya basin</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Uranga, Rodolfo M.</creatorcontrib><creatorcontrib>Ferrer, Oriol</creatorcontrib><creatorcontrib>Zamora, Gonzalo</creatorcontrib><creatorcontrib>Muñoz, Josep A.</creatorcontrib><creatorcontrib>Rowan, Mark G.</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><jtitle>Marine and petroleum geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Uranga, Rodolfo M.</au><au>Ferrer, Oriol</au><au>Zamora, Gonzalo</au><au>Muñoz, Josep A.</au><au>Rowan, Mark G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Salt tectonics of the offshore Tarfaya Basin, Moroccan Atlantic margin</atitle><jtitle>Marine and petroleum geology</jtitle><date>2022-04</date><risdate>2022</risdate><volume>138</volume><spage>105521</spage><pages>105521-</pages><artnum>105521</artnum><issn>0264-8172</issn><eissn>1873-4073</eissn><abstract>Salt tectonics play a critical role on passive margins evolution controlling aspects like structural style, subsidence patterns and thermal history, amongst others. The salt-bearing Atlantic passive margin of Morocco hosts one of the oldest stratigraphic records documenting the opening history of the Central Atlantic. However, the available seismic data is scarce and some offshore basins are still poorly studied, particularly in southern Morocco. Through the interpretation of an unpublished 2D/3D seismic dataset from the offshore Tarfaya Basin (SW Morocco), this study aims to highlight the key events that conditioned the evolution of this salt-bearing basin. From proximal to distal regions, the structural style of the basin is characterized by expulsion rollovers and salt-cored anticlines delimited by primary welded surfaces, evolving to buried salt sheets surrounded by thick minibasins and finally, diapirs actively deforming the modern seabed. From Late Triassic to Early Jurassic times, salt was deposited with a basinward thickening wedge-shaped geometry on a narrow trough developed over thinned continental crust. During the Jurassic, sedimentation and associated salt withdrawal triggered early salt deformation. Gravity gliding is a common process in salt-bearing passive margins that requires an originally continuous autochthonous salt layer with a minimum slope angle and longitude to thickness ratio of the overburden. However, in the Tarfaya Basin, the narrow geometry of the salt-bearing depocenter hampered this process. Early salt tectonics was probably triggered by slope progradation during the Early Jurassic. During the Early Cretaceous, the progradation of the Tan-Tan Delta promoted a continued basinward expulsion of salt, the development of a local salt-detached gravitational system and the proximal extrusion of salt sheets. Finally, from Late Cretaceous to the Present-day, shortening related to the convergence between Africa and Eurasia resulted in thick-skin inversion and the rejuvenation of precursor salt structures.
•Unpublished 2D and 3D seismic data from the salt-bearing offshore Tarfaya Basin (NW Africa) is presented.•Seismic interpretation and sequential structural restoration were carried out to understand the evolution of salt structures.•Salt was deposited on a narrow rifted margin over thinned continental crust during the syn-thinning stage.•Gravity gliding was hampered by the narrowness of the basin. Progradational loading triggered basinward salt withdrawal.•From Late Cretaceous to Cenozoic times, orogenic shortening caused diapir rejuvenation and promoted secondary welding.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.marpetgeo.2021.105521</doi><orcidid>https://orcid.org/0000-0003-2540-3650</orcidid><orcidid>https://orcid.org/0000-0002-4552-9106</orcidid><orcidid>https://orcid.org/0000-0003-3477-0321</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Basin evolution Central atlantic Morocco Rifted passive margins Salt tectonics Tarfaya basin |
title | Salt tectonics of the offshore Tarfaya Basin, Moroccan Atlantic margin |
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