Gravity analysis of salt structures. An example from the El Kef‐Ouargha region (northern Tunisia)
Identifieur interne : 000445 ( Istex/Corpus ); précédent : 000444; suivant : 000446Gravity analysis of salt structures. An example from the El Kef‐Ouargha region (northern Tunisia)
Auteurs : Mohamed Arfaoui ; Mohamed Hédi Inoubli ; Saïd Tlig ; Rabeh AlouaniSource :
- Geophysical Prospecting [ 0016-8025 ] ; 2011-05.
English descriptors
Abstract
Triassic outcrops in the Atlassic zone of northern Tunisia may be modelled in two ways: salt bodies piercing through Cretaceous terrains or Triassic salt flows stratified within an Albian series. Both models find support from gravity data and are debatable. To evaluate the mass distribution changes with depth, the Bouguer anomaly of the El Kef‐Ouargha region was successively decomposed into regional and residual components to construct multiple pseudo‐depth slices and apparent density maps. Analyses of gravity lows clearly show a vertical continuity of less dense materials below the Triassic salt outcrops. These features can be explained by salt diapirism during Mesozoic and Cenozoic. Further, gravity data tend to indicate less dense materials below Aptian outcropping in Jebel Aite (Oued Bou Adila); thus suggesting Triassic materials occurring at depth. In addition, dense entities were recognized under Mio‐Pliocene and Quaternary deposits, which are thought to correspond to Cretaceous paleoshoals currently collapsed by non‐outcropping faults. Our findings lend support to a diapir model intruding overburden rather than the salt glacier model stratified in the Albian series proposed by some authors as the genetic structural model for Triassic material‐bearing series in the north of Tunisia.
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DOI: 10.1111/j.1365-2478.2010.00941.x
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An example from the El Kef‐Ouargha region (northern Tunisia)</title><title type="shortAuthors"><i>M. Arfaoui</i> et al.</title><title type="short"><i>Gravity analysis of salt structures</i></title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1 #a2" corresponding="yes"><personName><givenNames>Mohamed</givenNames><familyName>Arfaoui</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Mohamed Hédi</givenNames><familyName>Inoubli</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a2"><personName><givenNames>Saïd</givenNames><familyName>Tlig</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a2 #a3"><personName><givenNames>Rabeh</givenNames><familyName>Alouani</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="TN"><unparsedAffiliation>Office National des Mines, BP n° 215, 1080 Tunis, Tunisia</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="TN"><unparsedAffiliation>Unité de Recherche de Géophysique Appliquée aux Matériaux et aux Minerais, Université Tunis‐El Manar, Faculté des Sciences de Tunis, 2092 El Mana, Tunis, Tunisia</unparsedAffiliation></affiliation><affiliation xml:id="a3" countryCode="TN"><unparsedAffiliation>Faculté des Sciences de Bizerte, 7021 Bizerte, Tunisia</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">Apparent density model</keyword><keyword xml:id="k2">Bouguer anomaly</keyword><keyword xml:id="k3">Gravity</keyword><keyword xml:id="k4">Regional‐residual separation</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">ABSTRACT</title><p>Triassic outcrops in the Atlassic zone of northern Tunisia may be modelled in two ways: salt bodies piercing through Cretaceous terrains or Triassic salt flows stratified within an Albian series. Both models find support from gravity data and are debatable. To evaluate the mass distribution changes with depth, the Bouguer anomaly of the El Kef‐Ouargha region was successively decomposed into regional and residual components to construct multiple pseudo‐depth slices and apparent density maps. Analyses of gravity lows clearly show a vertical continuity of less dense materials below the Triassic salt outcrops. These features can be explained by salt diapirism during Mesozoic and Cenozoic. Further, gravity data tend to indicate less dense materials below Aptian outcropping in Jebel Aite (Oued Bou Adila); thus suggesting Triassic materials occurring at depth. In addition, dense entities were recognized under Mio‐Pliocene and Quaternary deposits, which are thought to correspond to Cretaceous paleoshoals currently collapsed by non‐outcropping faults. Our findings lend support to a diapir model intruding overburden rather than the salt glacier model stratified in the Albian series proposed by some authors as the genetic structural model for Triassic material‐bearing series in the north of Tunisia.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Gravity analysis of salt structures. An example from the El Kef‐Ouargha region (northern Tunisia)</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Gravity analysis of salt structures</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Gravity analysis of salt structures. An example from the El Kef‐Ouargha region (northern Tunisia)</title></titleInfo><name type="personal"><namePart type="given">Mohamed</namePart><namePart type="family">Arfaoui</namePart><affiliation>Office National des Mines, BP n° 215, 1080 Tunis, Tunisia</affiliation><affiliation>Unité de Recherche de Géophysique Appliquée aux Matériaux et aux Minerais, Université Tunis‐El Manar, Faculté des Sciences de Tunis, 2092 El Mana, Tunis, Tunisia</affiliation><description>Correspondence: E‐mail: </description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Mohamed Hédi</namePart><namePart type="family">Inoubli</namePart><affiliation>Unité de Recherche de Géophysique Appliquée aux Matériaux et aux Minerais, Université Tunis‐El Manar, Faculté des Sciences de Tunis, 2092 El Mana, Tunis, Tunisia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Saïd</namePart><namePart type="family">Tlig</namePart><affiliation>Unité de Recherche de Géophysique Appliquée aux Matériaux et aux Minerais, Université Tunis‐El Manar, Faculté des Sciences de Tunis, 2092 El Mana, Tunis, Tunisia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Rabeh</namePart><namePart type="family">Alouani</namePart><affiliation>Unité de Recherche de Géophysique Appliquée aux Matériaux et aux Minerais, Université Tunis‐El Manar, Faculté des Sciences de Tunis, 2092 El Mana, Tunis, Tunisia</affiliation><affiliation>Faculté des Sciences de Bizerte, 7021 Bizerte, Tunisia</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2011-05</dateIssued><edition>Received May 2009, revision accepted December 2010</edition><copyrightDate encoding="w3cdtf">2011</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">12</extent><extent unit="tables">1</extent><extent unit="formulas">3</extent><extent unit="references">58</extent></physicalDescription><abstract lang="en">Triassic outcrops in the Atlassic zone of northern Tunisia may be modelled in two ways: salt bodies piercing through Cretaceous terrains or Triassic salt flows stratified within an Albian series. Both models find support from gravity data and are debatable. To evaluate the mass distribution changes with depth, the Bouguer anomaly of the El Kef‐Ouargha region was successively decomposed into regional and residual components to construct multiple pseudo‐depth slices and apparent density maps. Analyses of gravity lows clearly show a vertical continuity of less dense materials below the Triassic salt outcrops. These features can be explained by salt diapirism during Mesozoic and Cenozoic. Further, gravity data tend to indicate less dense materials below Aptian outcropping in Jebel Aite (Oued Bou Adila); thus suggesting Triassic materials occurring at depth. In addition, dense entities were recognized under Mio‐Pliocene and Quaternary deposits, which are thought to correspond to Cretaceous paleoshoals currently collapsed by non‐outcropping faults. Our findings lend support to a diapir model intruding overburden rather than the salt glacier model stratified in the Albian series proposed by some authors as the genetic structural model for Triassic material‐bearing series in the north of Tunisia.</abstract><subject lang="en"><genre>keywords</genre><topic>Apparent density model</topic><topic>Bouguer anomaly</topic><topic>Gravity</topic><topic>Regional‐residual separation</topic></subject><relatedItem type="host"><titleInfo><title>Geophysical Prospecting</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0016-8025</identifier><identifier type="eISSN">1365-2478</identifier><identifier type="DOI">10.1111/(ISSN)1365-2478</identifier><identifier type="PublisherID">GPR</identifier><part><date>2011</date><detail type="volume"><caption>vol.</caption><number>59</number></detail><detail type="issue"><caption>no.</caption><number>3</number></detail><extent unit="pages"><start>576</start><end>591</end><total>16</total></extent></part></relatedItem><identifier type="istex">AC3F472443DE330AF4B90ECD043AEA8BC8365CD7</identifier><identifier type="DOI">10.1111/j.1365-2478.2010.00941.x</identifier><identifier type="ArticleID">GPR941</identifier><accessCondition type="use and reproduction" contentType="copyright">© 2011 European Association of Geoscientists & Engineers</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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