{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T10:13:41Z","timestamp":1774260821668,"version":"3.50.1"},"reference-count":48,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[2008,1,1]],"date-time":"2008-01-01T00:00:00Z","timestamp":1199145600000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SP"],"published-print":{"date-parts":[[2008,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>\n            Two domains have previously been recognized in the Archaean Reguibat shield of NW Mauritania, based primarily on their gross lithological differences. New fieldwork has identified a major ductile shear zone (T\u00e2\u00e7ar\u00e2t\u2013Inemma\u00fbdene Shear Zone) separating these domains and new geochronological studies show that the two domains record different Mesoarchaean histories. As such, the two domains are redefined as the Choum\u2013Rag el Abiod Terrane and Tasiast\u2013Tijirit Terrane. Previous isotopic studies of metamorphic lithologies of the eastern Choum\u2013Rag el Abiod Terrane indicate a succession of crustal growth from about 3.5\u20133.45 Ga to between about 3.2 and 2.99 Ga. Isotopic data presented in this contribution from the Tasiast\u2013Tijirit Terrane indicate that emplacement of major calc-alkaline plutons occurred at\n            <jats:italic>c<\/jats:italic>\n            . 2.93 Ga after volcanism (preserved as greenstone belts) that included late felsic eruptive centres dated at\n            <jats:italic>c<\/jats:italic>\n            . 2965 Ma. This Mesoarchaean intrusive and extrusive magmatism was confined to the Tasiast\u2013Tijirit Terrane, where it was emplaced through migmatitic orthogneisses that are the oldest lithodemic unit of the Tasiast\u2013Tijirit Terrane. Widespread bimodal, post-tectonic magmatism in both terranes included major granitic magmatism dated at\n            <jats:italic>c<\/jats:italic>\n            . 2730 Ma. The north\u2013south- to NNE\u2013SSW-trending curvilinear T\u00e2\u00e7ar\u00e2t\u2013Inemma\u00fbdene Shear Zone that separates the two terranes records late intense transpressive ductile shearing. It has a flower structure over a horizontal distance of about 70 km across its southern portion with unquantifiable sinistral horizontal offset, and east-directed thrusting on its eastern side where it cuts into the Choum\u2013Rag el Abiod Terrane. A new U\u2013Pb zircon age of 2954\u00b1111 Ma is presented for a deformed granite confined within the central part of this shear zone. A minimum age for the shearing is provided by a previously determined\n            <jats:italic>c<\/jats:italic>\n            . 2.73 Ga age for a post-tectonic granite that cuts across the easternmost part of the shear zone in the Choum\u2013Rag el Abiod Terrane.\n          <\/jats:p>","DOI":"10.1144\/sp297.3","type":"journal-article","created":{"date-parts":[[2008,5,29]],"date-time":"2008-05-29T07:13:32Z","timestamp":1212045212000},"page":"33-52","source":"Crossref","is-referenced-by-count":51,"title":["Two Mesoarchaean terranes in the Reguibat shield of NW Mauritania"],"prefix":"10.1144","volume":"297","author":[{"given":"R. M.","family":"Key","sequence":"first","affiliation":[{"name":"BGS, Murchison House, West Mains Road, Edinburgh, EH9 3LA, UK (e-mail: )"}]},{"given":"S. C.","family":"Loughlin","sequence":"additional","affiliation":[{"name":"BGS, Murchison House, West Mains Road, Edinburgh, EH9 3LA, UK (e-mail: )"}]},{"given":"M.","family":"Gillespie","sequence":"additional","affiliation":[{"name":"BGS, Murchison House, West Mains Road, Edinburgh, EH9 3LA, UK (e-mail: )"}]},{"given":"M.","family":"Del Rio","sequence":"additional","affiliation":[{"name":"BGS, Murchison House, West Mains Road, Edinburgh, EH9 3LA, UK (e-mail: )"}]},{"given":"M. S. A.","family":"Horstwood","sequence":"additional","affiliation":[{"name":"NERC Isotope Geosciences Laboratory, Keyworth NG12 5GG, UK"}]},{"given":"Q. G.","family":"Crowley","sequence":"additional","affiliation":[{"name":"NERC Isotope Geosciences Laboratory, Keyworth NG12 5GG, UK"}]},{"given":"D. P. F.","family":"Darbyshire","sequence":"additional","affiliation":[{"name":"NERC Isotope Geosciences Laboratory, Keyworth NG12 5GG, UK"}]},{"given":"P. E. J.","family":"Pitfield","sequence":"additional","affiliation":[{"name":"BGS, Keyworth NG12 5GG, UK"}]},{"given":"P. J.","family":"Henney","sequence":"additional","affiliation":[{"name":"BGS, Keyworth NG12 5GG, UK"}]}],"member":"1881","published-online":{"date-parts":[[2008,5,22]]},"reference":[{"key":"e_1_3_2_2_1","first-page":"63","article-title":"Donn\u00e9es g\u00e9ochronologiques nouvelles sur l'Arch\u00e9en de l'Amsaga (dorsale Reguibat, Mauritanie)","volume":"315","author":"Auvray B.","year":"1992","unstructured":"Auvray B., Peucat J. J., Potrel A., Burg J. P., Dars R., Lo K.Donn\u00e9es g\u00e9ochronologiques nouvelles sur l'Arch\u00e9en de l'Amsaga (dorsale Reguibat, Mauritanie)Comptes Rendus de l'Academie des Sciences19923156370","journal-title":"Comptes Rendus de l'Academie des Sciences"},{"key":"e_1_3_2_3_1","article-title":"M\u00e9moires du BRGM","volume":"42","author":"Barr\u00e8re J.","year":"1967","unstructured":"Barr\u00e8re J.M\u00e9moires du BRGMLe groupe precambrien de l'Amsaga entre Atar et Akjoujt (Mauritanie). Etude d'un m\u00e9tamorphisme profond et de ses relations avec la migmatisation196742","journal-title":"Le groupe precambrien de l'Amsaga entre Atar et Akjoujt (Mauritanie). Etude d'un m\u00e9tamorphisme profond et de ses relations avec la migmatisation"},{"key":"e_1_3_2_4_1","article-title":"M\u00e9moires du BRGM","volume":"88","author":"Bessoles B.","year":"1977","unstructured":"Bessoles B.M\u00e9moires du BRGMG\u00e9ologie de l'Afrique. Le craton Ouest Africain197788","journal-title":"G\u00e9ologie de l'Afrique. Le craton Ouest Africain"},{"key":"e_1_3_2_5_1","first-page":"338","article-title":"Fe\u2013Mg mixing in cordierite; constraints from natural data and implications for cordierite\u2013garnet geothermometry in granulites","volume":"73","author":"Bhattacharya A.","year":"1988","unstructured":"Bhattacharya A., Mazumdar A. C., Sen A. C.Fe\u2013Mg mixing in cordierite; constraints from natural data and implications for cordierite\u2013garnet geothermometry in granulitesAmerican Mineralogist198873338344","journal-title":"American Mineralogist"},{"key":"e_1_3_2_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012-821X(97)00040-X"},{"key":"e_1_3_2_7_1","doi-asserted-by":"publisher","DOI":"10.2113\/gssgfbull.S7-V.7.1118"},{"key":"e_1_3_2_8_1","volume-title":"The Geochronology and Evolution of Africa","author":"Cahen L.","year":"1984","unstructured":"Cahen L., Snelling N. J., Delhal J., Vail J. R., Bonhomme M., Ledent D.The Geochronology and Evolution of Africa1984OxfordClarendon Press"},{"key":"e_1_3_2_9_1","first-page":"5","article-title":"DNAG#1 Subdivisions of the Superior province of the Canadian shield","volume":"13","author":"Card K. D.","year":"1986","unstructured":"Card K. D., Ciesielski A.DNAG#1 Subdivisions of the Superior province of the Canadian shieldGeosciences Canada198613513","journal-title":"Geosciences Canada"},{"key":"e_1_3_2_10_1","volume-title":"Les d\u00e9formations continentales arch\u00e9ennes. Exemples naturels et mod\u00e8lisation thermom\u00e9canique","author":"Chardon D.","year":"1997","unstructured":"Chardon D.Les d\u00e9formations continentales arch\u00e9ennes. Exemples naturels et mod\u00e8lisation thermom\u00e9canique199776RennesM\u00e9moires de G\u00e9osciences"},{"key":"e_1_3_2_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(92)90331-C"},{"key":"e_1_3_2_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2541(97)00101-0"},{"key":"e_1_3_2_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.precamres.2005.07.005"},{"key":"e_1_3_2_14_1","doi-asserted-by":"publisher","DOI":"10.1029\/90JB02219"},{"key":"e_1_3_2_15_1","doi-asserted-by":"publisher","DOI":"10.2113\/107.1-2.185"},{"key":"e_1_3_2_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4684-3033-2_10"},{"key":"e_1_3_2_17_1","doi-asserted-by":"publisher","DOI":"10.2113\/107.1-2.13"},{"key":"e_1_3_2_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.precamres.2003.12.011"},{"key":"e_1_3_2_19_1","first-page":"1118","article-title":"Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilake, New Hampshire","volume":"67","author":"Hodges K. V.","year":"1982","unstructured":"Hodges K. V., Spear F. S.Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilake, New HampshireAmerican Mineralogist19826711181134","journal-title":"American Mineralogist"},{"key":"e_1_3_2_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00306445"},{"key":"e_1_3_2_21_1","first-page":"1889","article-title":"Precision measurements of half-lives and specific activities of 235U and 238U","volume":"4","author":"Jaffey A. H.","year":"1971","unstructured":"Jaffey A. H., Flynn K. F., Glendenin L. E., Bentley W. C., Essling A. M.Precision measurements of half-lives and specific activities of 235U and 238UPhysics Reviews1971C418891906","journal-title":"Physics Reviews"},{"key":"e_1_3_2_22_1","volume-title":"1:200 000 geological map of the Chami Sheet (2015)","author":"Key R. M.","year":"2003","unstructured":"Key R. M.1:200 000 geological map of the Chami Sheet (2015)2003NouakchottGovernment of Mauritania"},{"key":"e_1_3_2_23_1","volume-title":"1:200 000 geological map of the Ahmeyim Sheet (2014)","author":"Key R. M.","year":"2003","unstructured":"Key R. M., Loughlin S. C.1:200 000 geological map of the Ahmeyim Sheet (2014)2003NouakchottGovernment of Mauritania"},{"key":"e_1_3_2_24_1","volume-title":"1:200 000 geological map of the Atar Sheet (2013)","author":"Key R. M.","year":"2003","unstructured":"Key R. M., Loughlin S.C., Waters C. N.1:200 000 geological map of the Atar Sheet (2013)2003NouakchottGovernment of Mauritania"},{"key":"e_1_3_2_25_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(73)90213-5"},{"key":"e_1_3_2_26_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(82)90165-X"},{"key":"e_1_3_2_27_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0024-4937(98)00023-1"},{"key":"e_1_3_2_28_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-821X(80)90007-2"},{"key":"e_1_3_2_29_1","series-title":"Berkeley Geochronology Center Special Publication No. 4","volume-title":"User's manual for Isoplot 3.00: a geochronological toolkit for Microsoft Excel","author":"Ludwig K. R.","year":"2003","unstructured":"Ludwig K. R.User's manual for Isoplot 3.00: a geochronological toolkit for Microsoft Excel2003Berkeley Geochronology Center Special Publication No. 4"},{"key":"e_1_3_2_30_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2005.03.011"},{"key":"e_1_3_2_31_1","volume-title":"Notice explicative de la carte g\u00e9ologique au 1\/200 000 de la feuille Chami (Mauritanie) \u2013 Prospection aurif\u00e8re dans le Tasiast\u2013Tijirit","author":"Maurin G.","year":"1997","unstructured":"Maurin G., Bronner G., Le Goff E., Chardon D.Notice explicative de la carte g\u00e9ologique au 1\/200 000 de la feuille Chami (Mauritanie) \u2013 Prospection aurif\u00e8re dans le Tasiast\u2013Tijirit19972459Rapport, BRGM"},{"key":"e_1_3_2_32_1","volume-title":"Migmatites and the Origin of Granitic Rocks","author":"Mehnert K. R.","year":"1968","unstructured":"Mehnert K. R.Migmatites and the Origin of Granitic Rocks1968AmsterdamElsevier"},{"key":"e_1_3_2_33_1","first-page":"303","article-title":"Quelques traits de l'histoire g\u00e9ologique du Sahara occidental","volume":"7","author":"Menchikoff N.","year":"1949","unstructured":"Menchikoff N.Quelques traits de l'histoire g\u00e9ologique du Sahara occidentalLivre jubilaire Charles Jacob, Annales H\u00eabat et Haug19497303325","journal-title":"Livre jubilaire Charles Jacob, Annales H\u00eabat et Haug"},{"key":"e_1_3_2_34_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0016756800023190"},{"key":"e_1_3_2_35_1","series-title":"Royal Society of Chemistry, Gateshead, Special Publication","first-page":"298","volume-title":"Plasma Source Mass Spectrometry: The New Millennium","author":"Nowell G. M.","year":"2001","unstructured":"Nowell G. M., Parrish R. R., Holland G., Tanner S. D.Simultaneous acquisition of isotope compositions and parent\/daughter ratios by non-isotope dilution solution\u2010mode plasma ionisation multi-collector mass spectrometry (PIMMS)Plasma Source Mass Spectrometry: The New Millennium2001267298310Royal Society of Chemistry, Gateshead, Special Publication"},{"key":"e_1_3_2_36_1","doi-asserted-by":"publisher","DOI":"10.1016\/0168-9622(87)90032-7"},{"key":"e_1_3_2_37_1","volume-title":"Microtectonics","author":"Passchier C. W.","year":"1996","unstructured":"Passchier C. W., Trouw R. A. J.Microtectonics1996BerlinSpringer"},{"key":"e_1_3_2_38_1","volume-title":"Notice explicative des cartes g\u00e9ologiques et g\u00eetologiques au 1\/200 000 et 1\/500 000 du Sud de la Mauritanie","author":"Pitfield P. E. J.","year":"2005","unstructured":"Pitfield P. E. J., Key R. M., Waters C. N., Hawkins M. P. H., Schofield D. I., Loughlin S. C., Barnes R. P.Notice explicative des cartes g\u00e9ologiques et g\u00eetologiques au 1\/200 000 et 1\/500 000 du Sud de la Mauritanie2005Nouakchott, MauritaniaDMG, Minist\u00e8re des Mines et de l'Industrie"},{"key":"e_1_3_2_39_1","volume-title":"Evolution tectono-m\u00e9tamorphique d'un segment de cro\u00fbte continentale arch\u00e9enne. Exemple de l'Amsaga (R.I. Mauritanie), Dorsale R\u00e9guibat (Craton Ouest Africain)","author":"Potrel A.","year":"1994","unstructured":"Potrel A.Evolution tectono-m\u00e9tamorphique d'un segment de cro\u00fbte continentale arch\u00e9enne. Exemple de l'Amsaga (R.I. Mauritanie), Dorsale R\u00e9guibat (Craton Ouest Africain)199456M\u00e9moire de G\u00e9osciences Rennes"},{"key":"e_1_3_2_40_1","doi-asserted-by":"publisher","DOI":"10.1144\/gsjgs.153.4.0507"},{"key":"e_1_3_2_41_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0301-9268(98)00044-8"},{"key":"e_1_3_2_42_1","doi-asserted-by":"publisher","DOI":"10.1016\/0098-3004(96)00007-6"},{"key":"e_1_3_2_43_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-84153-8_3"},{"key":"e_1_3_2_44_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-764905-097"},{"key":"e_1_3_2_45_1","volume-title":"Metamorphic Phase Equilibria and Pressure\u2013Temperature\u2013Time Paths","author":"Spear F. S.","year":"1993","unstructured":"Spear F. S.Metamorphic Phase Equilibria and Pressure\u2013Temperature\u2013Time Paths1993Mineralogical Society of America, Reviews in Mineralogy"},{"key":"e_1_3_2_46_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF00375302"},{"key":"e_1_3_2_47_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-821X(75)90088-6"},{"key":"e_1_3_2_48_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1751-908X.1995.tb00147.x"},{"key":"e_1_3_2_49_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.0263-4929.2000.00303.x"}],"container-title":["Geological Society, London, Special Publications"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.lyellcollection.org\/doi\/pdf\/10.1144\/SP297.3","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,7,23]],"date-time":"2024-07-23T22:37:43Z","timestamp":1721774263000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.lyellcollection.org\/doi\/10.1144\/SP297.3"},"secondary":[{"URL":"https:\/\/pubs.geoscienceworld.org\/books\/book\/1926\/chapter\/107484450\/two-mesoarchaean-terranes-in-the-reguibat-shield","label":"geoscienceworld"},{"URL":"https:\/\/pubs.geoscienceworld.org\/UrlRedirectHandler.ashx?routename=books&chapterdoi=10.1144\/SP297.3&request=chapter","label":"geoscienceworld"}]},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,1]]},"references-count":48,"journal-issue":{"issue":"1","published-online":{"date-parts":[[2008,5,28]]},"published-print":{"date-parts":[[2008,1]]}},"alternative-id":["10.1144\/SP297.3"],"URL":"https:\/\/doi.org\/10.1144\/sp297.3","relation":{},"ISSN":["0305-8719","2041-4927"],"issn-type":[{"value":"0305-8719","type":"print"},{"value":"2041-4927","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,1]]}}}