Post‐Variscan exhumation of the Central Anti‐Atlas (Morocco) constrained by zircon and apatite fission‐track thermochronology
Identifieur interne : 000301 ( Main/Exploration ); précédent : 000300; suivant : 000302Post‐Variscan exhumation of the Central Anti‐Atlas (Morocco) constrained by zircon and apatite fission‐track thermochronology
Auteurs : Mostafa Oukassou [Maroc] ; Omar Saddiqi [Maroc] ; Jocelyn Barbarand [France] ; Samira Sebti [Maroc] ; Lahssen Baidder [Maroc] ; André Michard [France]Source :
- Terra Nova [ 0954-4879 ] ; 2013-04.
Abstract
The origin of the Anti‐Atlas relief is one of the currently debated issues of Moroccan geology. To constrain the post‐Variscan evolution of the Central Anti‐Atlas, we collected nine samples from the Precambrian basement of the Bou Azzer‐El Graara inlier for zircon and apatite fission‐track thermochronology. Zircon ages cluster between 340 ± 20 and 306 ± 20 Ma, whereas apatite ages range from 171 ± 7 Ma to 133 ± 5 Ma. Zircon ages reflect the thermal effect of the Variscan orogeny (tectonic thickening of the ca. 7 km‐thick Paleozoic series), likely enhanced by fluid advection. Apatite ages record a complex Mesozoic–Cenozoic exhumation history. Track length modelling yields evidence that, (i) the Precambrian basement was still buried at ca. 5 km depth by Permian times, (ii) the Central Anti‐Atlas was subjected to (erosional) exhumation during the Triassic‐Early Cretaceous, then buried beneath ca. 1.5 km‐thick Cretaceous‐Paleogene deposits, (iii) final exhumation took place during the Neogene, contemporaneously with that of the High Atlas.
Url:
DOI: 10.1111/ter.12019
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000027
- to stream Istex, to step Curation: 000009
- to stream Istex, to step Checkpoint: 000045
- to stream Main, to step Merge: 000302
- to stream Main, to step Curation: 000301
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Post‐Variscan exhumation of the Central Anti‐Atlas (Morocco) constrained by zircon and apatite fission‐track thermochronology</title><author><name sortKey="Oukassou, Mostafa" sort="Oukassou, Mostafa" uniqKey="Oukassou M" first="Mostafa" last="Oukassou">Mostafa Oukassou</name></author><author><name sortKey="Saddiqi, Omar" sort="Saddiqi, Omar" uniqKey="Saddiqi O" first="Omar" last="Saddiqi">Omar Saddiqi</name></author><author><name sortKey="Barbarand, Jocelyn" sort="Barbarand, Jocelyn" uniqKey="Barbarand J" first="Jocelyn" last="Barbarand">Jocelyn Barbarand</name></author><author><name sortKey="Sebti, Samira" sort="Sebti, Samira" uniqKey="Sebti S" first="Samira" last="Sebti">Samira Sebti</name></author><author><name sortKey="Baidder, Lahssen" sort="Baidder, Lahssen" uniqKey="Baidder L" first="Lahssen" last="Baidder">Lahssen Baidder</name></author><author><name sortKey="Michard, Andre" sort="Michard, Andre" uniqKey="Michard A" first="André" last="Michard">André Michard</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:A52B048C83D2D1DEAE281CBD0766AEA1F69008EF</idno><date when="2013" year="2013">2013</date><idno type="doi">10.1111/ter.12019</idno><idno type="url">https://api.istex.fr/document/A52B048C83D2D1DEAE281CBD0766AEA1F69008EF/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000027</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000027</idno><idno type="wicri:Area/Istex/Curation">000009</idno><idno type="wicri:Area/Istex/Checkpoint">000045</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000045</idno><idno type="wicri:doubleKey">0954-4879:2013:Oukassou M:post:variscan:exhumation</idno><idno type="wicri:Area/Main/Merge">000302</idno><idno type="wicri:Area/Main/Curation">000301</idno><idno type="wicri:Area/Main/Exploration">000301</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Post‐Variscan exhumation of the Central Anti‐Atlas (Morocco) constrained by zircon and apatite fission‐track thermochronology</title><author><name sortKey="Oukassou, Mostafa" sort="Oukassou, Mostafa" uniqKey="Oukassou M" first="Mostafa" last="Oukassou">Mostafa Oukassou</name><affiliation wicri:level="1"><country xml:lang="fr">Maroc</country><wicri:regionArea>Laboratoire «Géosciences», Faculté des Sciences, Université Hassan II, BP 5366 Maârif, Casablanca</wicri:regionArea><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Saddiqi, Omar" sort="Saddiqi, Omar" uniqKey="Saddiqi O" first="Omar" last="Saddiqi">Omar Saddiqi</name><affiliation wicri:level="1"><country xml:lang="fr">Maroc</country><wicri:regionArea>Laboratoire «Géosciences», Faculté des Sciences, Université Hassan II, BP 5366 Maârif, Casablanca</wicri:regionArea><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Barbarand, Jocelyn" sort="Barbarand, Jocelyn" uniqKey="Barbarand J" first="Jocelyn" last="Barbarand">Jocelyn Barbarand</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Université Paris‐Sud, UMR CNRS‐UPS 8148 IDES, 91405, Bâtiment 504Orsay Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Bâtiment 504Orsay</settlement></placeName></affiliation></author><author><name sortKey="Sebti, Samira" sort="Sebti, Samira" uniqKey="Sebti S" first="Samira" last="Sebti">Samira Sebti</name><affiliation wicri:level="1"><country xml:lang="fr">Maroc</country><wicri:regionArea>Laboratoire «Géosciences», Faculté des Sciences, Université Hassan II, BP 5366 Maârif, Casablanca</wicri:regionArea><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Baidder, Lahssen" sort="Baidder, Lahssen" uniqKey="Baidder L" first="Lahssen" last="Baidder">Lahssen Baidder</name><affiliation wicri:level="1"><country xml:lang="fr">Maroc</country><wicri:regionArea>Laboratoire «Géosciences», Faculté des Sciences, Université Hassan II, BP 5366 Maârif, Casablanca</wicri:regionArea><wicri:noRegion>Casablanca</wicri:noRegion></affiliation></author><author><name sortKey="Michard, Andre" sort="Michard, Andre" uniqKey="Michard A" first="André" last="Michard">André Michard</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Paris XI University, 10 rue des Jeûneurs, 75002, Paris</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Terra Nova</title><title level="j" type="abbrev">Terra Nova</title><idno type="ISSN">0954-4879</idno><idno type="eISSN">1365-3121</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2013-04">2013-04</date><biblScope unit="volume">25</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="151">151</biblScope><biblScope unit="page" to="159">159</biblScope></imprint><idno type="ISSN">0954-4879</idno></series><idno type="istex">A52B048C83D2D1DEAE281CBD0766AEA1F69008EF</idno><idno type="DOI">10.1111/ter.12019</idno><idno type="ArticleID">TER12019</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0954-4879</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The origin of the Anti‐Atlas relief is one of the currently debated issues of Moroccan geology. To constrain the post‐Variscan evolution of the Central Anti‐Atlas, we collected nine samples from the Precambrian basement of the Bou Azzer‐El Graara inlier for zircon and apatite fission‐track thermochronology. Zircon ages cluster between 340 ± 20 and 306 ± 20 Ma, whereas apatite ages range from 171 ± 7 Ma to 133 ± 5 Ma. Zircon ages reflect the thermal effect of the Variscan orogeny (tectonic thickening of the ca. 7 km‐thick Paleozoic series), likely enhanced by fluid advection. Apatite ages record a complex Mesozoic–Cenozoic exhumation history. Track length modelling yields evidence that, (i) the Precambrian basement was still buried at ca. 5 km depth by Permian times, (ii) the Central Anti‐Atlas was subjected to (erosional) exhumation during the Triassic‐Early Cretaceous, then buried beneath ca. 1.5 km‐thick Cretaceous‐Paleogene deposits, (iii) final exhumation took place during the Neogene, contemporaneously with that of the High Atlas.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Île-de-France</li></region><settlement><li>Bâtiment 504Orsay</li><li>Paris</li></settlement></list><tree><country name="Maroc"><noRegion><name sortKey="Oukassou, Mostafa" sort="Oukassou, Mostafa" uniqKey="Oukassou M" first="Mostafa" last="Oukassou">Mostafa Oukassou</name></noRegion><name sortKey="Baidder, Lahssen" sort="Baidder, Lahssen" uniqKey="Baidder L" first="Lahssen" last="Baidder">Lahssen Baidder</name><name sortKey="Saddiqi, Omar" sort="Saddiqi, Omar" uniqKey="Saddiqi O" first="Omar" last="Saddiqi">Omar Saddiqi</name><name sortKey="Sebti, Samira" sort="Sebti, Samira" uniqKey="Sebti S" first="Samira" last="Sebti">Samira Sebti</name></country><country name="France"><region name="Île-de-France"><name sortKey="Barbarand, Jocelyn" sort="Barbarand, Jocelyn" uniqKey="Barbarand J" first="Jocelyn" last="Barbarand">Jocelyn Barbarand</name></region><name sortKey="Michard, Andre" sort="Michard, Andre" uniqKey="Michard A" first="André" last="Michard">André Michard</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Terre/explor/CobaltMaghrebV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000301 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000301 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Terre
|area= CobaltMaghrebV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:A52B048C83D2D1DEAE281CBD0766AEA1F69008EF
|texte= Post‐Variscan exhumation of the Central Anti‐Atlas (Morocco) constrained by zircon and apatite fission‐track thermochronology
}}
| This area was generated with Dilib version V0.6.32. |  |