Late Permian mafic rocks identified within the Doba Basin of southern Chad and their relationship to the boundary of the Saharan Metacraton
The Doba gabbro was collected from an exploration well through the Cretaceous Doba basin of southern Chad. The gabbro is composed mostly of plagioclase, clinopyroxene and Fe-Ti oxide minerals and displays cumulus mineral textures. Whole-rock 40Ar-39Ar step-heating geochronology yielded a Late Permia...
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| Veröffentlicht in: | Geological magazine 2015-11, Vol.152 (6), p.1073-1084 |
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| creator | Shellnutt, John Gregory Lee, Tungyi Yang, Chihcheng Hu, Shintai Wu, Jongchang Wang, Kuolung Lo, Chinghua |
| description | The Doba gabbro was collected from an exploration well through the Cretaceous Doba basin of southern Chad. The gabbro is composed mostly of plagioclase, clinopyroxene and Fe-Ti oxide minerals and displays cumulus mineral textures. Whole-rock 40Ar-39Ar step-heating geochronology yielded a Late Permian plateau age of 257±1 Ma. The major and trace elemental geochemistry shows that the gabbro is tholeiitic in composition and has trace element ratios (i.e. La/YbN>7; Sm/YbPM>2.4; Nb/Y>1; Zr/Y>5) indicative of a basaltic melt derived from a garnet-bearing mantle source. The moderately enriched Sr-Nd isotopes (i.e. ISr=0.70495 to 0.70839; εNd(T)=-1.0 to -1.3) fall within the mantle array (i.e. OIB-like) and are similar to other Late Permian plutonic rocks of North-Central Africa (i.e. ISr=0.7040 to 0.7070). The enriched isotopic composition of the Doba gabbro contrasts with the more depleted compositions of the spatially associated Neoproterozoic post-Pan-African within-plate granites. The contrasting Nd isotope composition between the older within-plate granites and the younger Doba gabbro indicates that different mantle sources produced the rocks and thus may mark the southern boundary of the Saharan Metacraton. |
| doi_str_mv | 10.1017/S0016756815000217 |
| format | Article |
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The gabbro is composed mostly of plagioclase, clinopyroxene and Fe-Ti oxide minerals and displays cumulus mineral textures. Whole-rock 40Ar-39Ar step-heating geochronology yielded a Late Permian plateau age of 257±1 Ma. The major and trace elemental geochemistry shows that the gabbro is tholeiitic in composition and has trace element ratios (i.e. La/YbN>7; Sm/YbPM>2.4; Nb/Y>1; Zr/Y>5) indicative of a basaltic melt derived from a garnet-bearing mantle source. The moderately enriched Sr-Nd isotopes (i.e. ISr=0.70495 to 0.70839; εNd(T)=-1.0 to -1.3) fall within the mantle array (i.e. OIB-like) and are similar to other Late Permian plutonic rocks of North-Central Africa (i.e. ISr=0.7040 to 0.7070). The enriched isotopic composition of the Doba gabbro contrasts with the more depleted compositions of the spatially associated Neoproterozoic post-Pan-African within-plate granites. The contrasting Nd isotope composition between the older within-plate granites and the younger Doba gabbro indicates that different mantle sources produced the rocks and thus may mark the southern boundary of the Saharan Metacraton.</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S0016756815000217</identifier><identifier>CODEN: GEMGA4</identifier><language>eng</language><publisher>Cambridge: Cambridge University Press</publisher><subject>absolute age ; Africa ; Ar/Ar ; basement ; basins ; Chad ; chemical composition ; cratons ; Cretaceous ; dates ; Doba Basin ; gabbros ; Geochemistry ; Geochronology ; Geological time ; Geology ; Granite ; ICP mass spectra ; igneous and metamorphic rocks ; igneous rocks ; Lower Permian ; mafic composition ; magmas ; major elements ; mantle ; mass spectra ; Mayo Kebbi Massif ; metals ; mineral composition ; Minerals ; Neoproterozoic ; Paleozoic ; Pan-African Orogeny ; Permian ; Petrology ; plutonic rocks ; Precambrian ; Proterozoic ; provenance ; Rocks ; Saharan Craton ; southern Chad ; spectra ; textures ; tholeiitic composition ; Trace elements ; upper Precambrian ; West Africa ; whole rock ; X-ray fluorescence spectra</subject><ispartof>Geological magazine, 2015-11, Vol.152 (6), p.1073-1084</ispartof><rights>GeoRef, Copyright 2020, American Geosciences Institute.</rights><rights>Copyright © Cambridge University Press 2015</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a332t-60ee5dd7adb0cf4a95ea4840663a6ee2a38ecdcfb91ec3a32c6c40fa6496b0203</citedby><cites>FETCH-LOGICAL-a332t-60ee5dd7adb0cf4a95ea4840663a6ee2a38ecdcfb91ec3a32c6c40fa6496b0203</cites></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>Shellnutt, John Gregory</creatorcontrib><creatorcontrib>Lee, Tungyi</creatorcontrib><creatorcontrib>Yang, Chihcheng</creatorcontrib><creatorcontrib>Hu, Shintai</creatorcontrib><creatorcontrib>Wu, Jongchang</creatorcontrib><creatorcontrib>Wang, Kuolung</creatorcontrib><creatorcontrib>Lo, Chinghua</creatorcontrib><title>Late Permian mafic rocks identified within the Doba Basin of southern Chad and their relationship to the boundary of the Saharan Metacraton</title><title>Geological magazine</title><description>The Doba gabbro was collected from an exploration well through the Cretaceous Doba basin of southern Chad. The gabbro is composed mostly of plagioclase, clinopyroxene and Fe-Ti oxide minerals and displays cumulus mineral textures. Whole-rock 40Ar-39Ar step-heating geochronology yielded a Late Permian plateau age of 257±1 Ma. The major and trace elemental geochemistry shows that the gabbro is tholeiitic in composition and has trace element ratios (i.e. La/YbN>7; Sm/YbPM>2.4; Nb/Y>1; Zr/Y>5) indicative of a basaltic melt derived from a garnet-bearing mantle source. The moderately enriched Sr-Nd isotopes (i.e. ISr=0.70495 to 0.70839; εNd(T)=-1.0 to -1.3) fall within the mantle array (i.e. OIB-like) and are similar to other Late Permian plutonic rocks of North-Central Africa (i.e. ISr=0.7040 to 0.7070). The enriched isotopic composition of the Doba gabbro contrasts with the more depleted compositions of the spatially associated Neoproterozoic post-Pan-African within-plate granites. The contrasting Nd isotope composition between the older within-plate granites and the younger Doba gabbro indicates that different mantle sources produced the rocks and thus may mark the southern boundary of the Saharan Metacraton.</description><subject>absolute age</subject><subject>Africa</subject><subject>Ar/Ar</subject><subject>basement</subject><subject>basins</subject><subject>Chad</subject><subject>chemical composition</subject><subject>cratons</subject><subject>Cretaceous</subject><subject>dates</subject><subject>Doba Basin</subject><subject>gabbros</subject><subject>Geochemistry</subject><subject>Geochronology</subject><subject>Geological time</subject><subject>Geology</subject><subject>Granite</subject><subject>ICP mass spectra</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>Lower Permian</subject><subject>mafic composition</subject><subject>magmas</subject><subject>major elements</subject><subject>mantle</subject><subject>mass spectra</subject><subject>Mayo Kebbi Massif</subject><subject>metals</subject><subject>mineral composition</subject><subject>Minerals</subject><subject>Neoproterozoic</subject><subject>Paleozoic</subject><subject>Pan-African Orogeny</subject><subject>Permian</subject><subject>Petrology</subject><subject>plutonic rocks</subject><subject>Precambrian</subject><subject>Proterozoic</subject><subject>provenance</subject><subject>Rocks</subject><subject>Saharan Craton</subject><subject>southern Chad</subject><subject>spectra</subject><subject>textures</subject><subject>tholeiitic composition</subject><subject>Trace elements</subject><subject>upper Precambrian</subject><subject>West Africa</subject><subject>whole rock</subject><subject>X-ray fluorescence spectra</subject><issn>0016-7568</issn><issn>1469-5081</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNplkM9KxDAQxoMouK4-gLeAR6kmTZu2R13_woqCei7TZGqju8maZBGfwZc2dQUPnoZv5vvNxwwhh5ydcMar00fGuKxKWfOSMZbzaotMeCGbrGQ13yaTcZyN812yF8JrkoLV9YR8zSEifUC_NGDpEnqjqHfqLVCj0UbTG9T0w8TBWBoHpBeuA3oOIUnX0-DWqektnQ2gKVg9eoynHhcQjbNhMCsa3Q_ZubXV4D9HbtSPMIBPmXcYQXmIzu6TnR4WAQ9-65Q8X10-zW6y-f317exsnoEQecwkQyy1rkB3TPUFNCVCURdMSgESMQdRo9Kq7xqOSoDIlVQF60EWjexYzsSUHG32rrx7X2OI7atbe5siW17JpsjrkvPk4huX8i4Ej3278maZDmg5a8eft_9-npjjDfOCLiiDVuGH8wv9F5AnpE1c00jxDT17hOo</recordid><startdate>20151101</startdate><enddate>20151101</enddate><creator>Shellnutt, John 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; Lee, Tungyi ; Yang, Chihcheng ; Hu, Shintai ; Wu, Jongchang ; Wang, Kuolung ; Lo, Chinghua</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a332t-60ee5dd7adb0cf4a95ea4840663a6ee2a38ecdcfb91ec3a32c6c40fa6496b0203</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>absolute age</topic><topic>Africa</topic><topic>Ar/Ar</topic><topic>basement</topic><topic>basins</topic><topic>Chad</topic><topic>chemical composition</topic><topic>cratons</topic><topic>Cretaceous</topic><topic>dates</topic><topic>Doba Basin</topic><topic>gabbros</topic><topic>Geochemistry</topic><topic>Geochronology</topic><topic>Geological time</topic><topic>Geology</topic><topic>Granite</topic><topic>ICP mass spectra</topic><topic>igneous and metamorphic rocks</topic><topic>igneous rocks</topic><topic>Lower Permian</topic><topic>mafic composition</topic><topic>magmas</topic><topic>major elements</topic><topic>mantle</topic><topic>mass spectra</topic><topic>Mayo Kebbi Massif</topic><topic>metals</topic><topic>mineral composition</topic><topic>Minerals</topic><topic>Neoproterozoic</topic><topic>Paleozoic</topic><topic>Pan-African Orogeny</topic><topic>Permian</topic><topic>Petrology</topic><topic>plutonic rocks</topic><topic>Precambrian</topic><topic>Proterozoic</topic><topic>provenance</topic><topic>Rocks</topic><topic>Saharan Craton</topic><topic>southern Chad</topic><topic>spectra</topic><topic>textures</topic><topic>tholeiitic composition</topic><topic>Trace elements</topic><topic>upper Precambrian</topic><topic>West Africa</topic><topic>whole rock</topic><topic>X-ray fluorescence spectra</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shellnutt, John Gregory</creatorcontrib><creatorcontrib>Lee, Tungyi</creatorcontrib><creatorcontrib>Yang, Chihcheng</creatorcontrib><creatorcontrib>Hu, 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magazine</jtitle><date>2015-11-01</date><risdate>2015</risdate><volume>152</volume><issue>6</issue><spage>1073</spage><epage>1084</epage><pages>1073-1084</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><coden>GEMGA4</coden><abstract>The Doba gabbro was collected from an exploration well through the Cretaceous Doba basin of southern Chad. The gabbro is composed mostly of plagioclase, clinopyroxene and Fe-Ti oxide minerals and displays cumulus mineral textures. Whole-rock 40Ar-39Ar step-heating geochronology yielded a Late Permian plateau age of 257±1 Ma. The major and trace elemental geochemistry shows that the gabbro is tholeiitic in composition and has trace element ratios (i.e. La/YbN>7; Sm/YbPM>2.4; Nb/Y>1; Zr/Y>5) indicative of a basaltic melt derived from a garnet-bearing mantle source. The moderately enriched Sr-Nd isotopes (i.e. ISr=0.70495 to 0.70839; εNd(T)=-1.0 to -1.3) fall within the mantle array (i.e. OIB-like) and are similar to other Late Permian plutonic rocks of North-Central Africa (i.e. ISr=0.7040 to 0.7070). The enriched isotopic composition of the Doba gabbro contrasts with the more depleted compositions of the spatially associated Neoproterozoic post-Pan-African within-plate granites. The contrasting Nd isotope composition between the older within-plate granites and the younger Doba gabbro indicates that different mantle sources produced the rocks and thus may mark the southern boundary of the Saharan Metacraton.</abstract><cop>Cambridge</cop><pub>Cambridge University Press</pub><doi>10.1017/S0016756815000217</doi><tpages>12</tpages></addata></record> |
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| subjects | absolute age Africa Ar/Ar basement basins Chad chemical composition cratons Cretaceous dates Doba Basin gabbros Geochemistry Geochronology Geological time Geology Granite ICP mass spectra igneous and metamorphic rocks igneous rocks Lower Permian mafic composition magmas major elements mantle mass spectra Mayo Kebbi Massif metals mineral composition Minerals Neoproterozoic Paleozoic Pan-African Orogeny Permian Petrology plutonic rocks Precambrian Proterozoic provenance Rocks Saharan Craton southern Chad spectra textures tholeiitic composition Trace elements upper Precambrian West Africa whole rock X-ray fluorescence spectra |
| title | Late Permian mafic rocks identified within the Doba Basin of southern Chad and their relationship to the boundary of the Saharan Metacraton |
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