Geochemistry of Mount Orford ophiolite complex, Northern Appalachians, Canada
The Orford ophiolite complex is part of an ultramafic-mafic belt occurring within the Québec Appalachians. These allochtonous bodies were emplaced during the Early Ordovician. The Orford complex comprises (from bottom to top): ultramafic cumulate rocks (dunite to pyroxenite), gabbros, sheeted sills...
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| Veröffentlicht in: | Chemical geology 1989-10, Vol.77 (2), p.133-147 |
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| creator | Harnois, Luc Morency, Maurice |
| description | The Orford ophiolite complex is part of an ultramafic-mafic belt occurring within the Québec Appalachians. These allochtonous bodies were emplaced during the Early Ordovician. The Orford complex comprises (from bottom to top): ultramafic cumulate rocks (dunite to pyroxenite), gabbros, sheeted sills (diabase) and volcanic rocks.
Representative rocks (10 ultramafic cumulate rocks, 5 gabbros, 8 diabases, 8 volcanic rocks) from all rock units were analysed for major elements and Ba, Cr, Ni, Rb, Sr, Y, Zn, Zr and REE. Rare-earth element abundances in cumulate dunites are ∼0.04−0.08× chondrite. Pyroxene-bearing cumulates are all strongly LREE-depleted and have HREE abundances ranging from 0.6× to 2.5× chondrite. Some gabbros analysed have up to 40−45× chondrite HREE. The diabases of the sheeted sill complex and the volcanic rocks have MORB-like REE patterns.
Geochemical modelling of the REE strongly suggests that ultramafic cumulates, gabbros, sheeted sills and volcanic rocks are coeval and were derived from a LREE-depleted, MORB-type lherzolitic mantle source. An arc environment is favoured as a tectonic setting for the Mount Orford ophiolite complex. |
| doi_str_mv | 10.1016/0009-2541(89)90138-1 |
| format | Article |
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Representative rocks (10 ultramafic cumulate rocks, 5 gabbros, 8 diabases, 8 volcanic rocks) from all rock units were analysed for major elements and Ba, Cr, Ni, Rb, Sr, Y, Zn, Zr and REE. Rare-earth element abundances in cumulate dunites are ∼0.04−0.08× chondrite. Pyroxene-bearing cumulates are all strongly LREE-depleted and have HREE abundances ranging from 0.6× to 2.5× chondrite. Some gabbros analysed have up to 40−45× chondrite HREE. The diabases of the sheeted sill complex and the volcanic rocks have MORB-like REE patterns.
Geochemical modelling of the REE strongly suggests that ultramafic cumulates, gabbros, sheeted sills and volcanic rocks are coeval and were derived from a LREE-depleted, MORB-type lherzolitic mantle source. An arc environment is favoured as a tectonic setting for the Mount Orford ophiolite complex.</description><identifier>ISSN: 0009-2541</identifier><identifier>EISSN: 1872-6836</identifier><identifier>DOI: 10.1016/0009-2541(89)90138-1</identifier><identifier>CODEN: CHGEAD</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Chondrites ; Crystalline rocks ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Geochemistry ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Soil and rock geochemistry</subject><ispartof>Chemical geology, 1989-10, Vol.77 (2), p.133-147</ispartof><rights>1989</rights><rights>1990 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a387t-9c60cef2cc7e7198d4d55e252fa88c4589441504b5d2f7a4a11c8f557eb4ea303</citedby><cites>FETCH-LOGICAL-a387t-9c60cef2cc7e7198d4d55e252fa88c4589441504b5d2f7a4a11c8f557eb4ea303</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0009-2541(89)90138-1$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,45974</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=6694245$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Harnois, Luc</creatorcontrib><creatorcontrib>Morency, Maurice</creatorcontrib><title>Geochemistry of Mount Orford ophiolite complex, Northern Appalachians, Canada</title><title>Chemical geology</title><description>The Orford ophiolite complex is part of an ultramafic-mafic belt occurring within the Québec Appalachians. These allochtonous bodies were emplaced during the Early Ordovician. The Orford complex comprises (from bottom to top): ultramafic cumulate rocks (dunite to pyroxenite), gabbros, sheeted sills (diabase) and volcanic rocks.
Representative rocks (10 ultramafic cumulate rocks, 5 gabbros, 8 diabases, 8 volcanic rocks) from all rock units were analysed for major elements and Ba, Cr, Ni, Rb, Sr, Y, Zn, Zr and REE. Rare-earth element abundances in cumulate dunites are ∼0.04−0.08× chondrite. Pyroxene-bearing cumulates are all strongly LREE-depleted and have HREE abundances ranging from 0.6× to 2.5× chondrite. Some gabbros analysed have up to 40−45× chondrite HREE. The diabases of the sheeted sill complex and the volcanic rocks have MORB-like REE patterns.
Geochemical modelling of the REE strongly suggests that ultramafic cumulates, gabbros, sheeted sills and volcanic rocks are coeval and were derived from a LREE-depleted, MORB-type lherzolitic mantle source. An arc environment is favoured as a tectonic setting for the Mount Orford ophiolite complex.</description><subject>Chondrites</subject><subject>Crystalline rocks</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Geochemistry</subject><subject>Igneous and metamorphic rocks petrology, volcanic processes, magmas</subject><subject>Soil and rock geochemistry</subject><issn>0009-2541</issn><issn>1872-6836</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNp9kMFKAzEQhoMoWKtv4GEPIgpdTTbJbvYilKJVaO1Fz2GandDIdrMmW7Fv79YWj56Gge__h_kIuWT0jlGW31NKyzSTgt2o8rakjKuUHZEBU0WW5ornx2Twh5ySsxg_-pVxKQdkPkVvVrh2sQvbxNtk7jdNlyyC9aFKfLtyvnYdJsav2xq_R8mrD90KQ5OM2xZqMCsHTRwlE2iggnNyYqGOeHGYQ_L-9Pg2eU5ni-nLZDxLgauiS0uTU4M2M6bAgpWqEpWUmMnMglJGSFUKwSQVS1lltgABjBllpSxwKRA45UNyve9tg__cYOx0_4DBuoYG_SZqVmSSF5z3oNiDJvgYA1rdBreGsNWM6p07vROjd2K0KvWvO8362NWhH6KB2gZojIt_2TwvRSZkjz3sMex__XIYdDQOG4OVC2g6XXn3_50fPdGCJw</recordid><startdate>19891005</startdate><enddate>19891005</enddate><creator>Harnois, Luc</creator><creator>Morency, Maurice</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>19891005</creationdate><title>Geochemistry of Mount Orford ophiolite complex, Northern Appalachians, Canada</title><author>Harnois, Luc ; Morency, Maurice</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a387t-9c60cef2cc7e7198d4d55e252fa88c4589441504b5d2f7a4a11c8f557eb4ea303</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>Chondrites</topic><topic>Crystalline rocks</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Geochemistry</topic><topic>Igneous and metamorphic rocks petrology, volcanic processes, magmas</topic><topic>Soil and rock geochemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Harnois, Luc</creatorcontrib><creatorcontrib>Morency, Maurice</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Chemical geology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Harnois, Luc</au><au>Morency, Maurice</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Geochemistry of Mount Orford ophiolite complex, Northern Appalachians, Canada</atitle><jtitle>Chemical geology</jtitle><date>1989-10-05</date><risdate>1989</risdate><volume>77</volume><issue>2</issue><spage>133</spage><epage>147</epage><pages>133-147</pages><issn>0009-2541</issn><eissn>1872-6836</eissn><coden>CHGEAD</coden><abstract>The Orford ophiolite complex is part of an ultramafic-mafic belt occurring within the Québec Appalachians. These allochtonous bodies were emplaced during the Early Ordovician. The Orford complex comprises (from bottom to top): ultramafic cumulate rocks (dunite to pyroxenite), gabbros, sheeted sills (diabase) and volcanic rocks.
Representative rocks (10 ultramafic cumulate rocks, 5 gabbros, 8 diabases, 8 volcanic rocks) from all rock units were analysed for major elements and Ba, Cr, Ni, Rb, Sr, Y, Zn, Zr and REE. Rare-earth element abundances in cumulate dunites are ∼0.04−0.08× chondrite. Pyroxene-bearing cumulates are all strongly LREE-depleted and have HREE abundances ranging from 0.6× to 2.5× chondrite. Some gabbros analysed have up to 40−45× chondrite HREE. The diabases of the sheeted sill complex and the volcanic rocks have MORB-like REE patterns.
Geochemical modelling of the REE strongly suggests that ultramafic cumulates, gabbros, sheeted sills and volcanic rocks are coeval and were derived from a LREE-depleted, MORB-type lherzolitic mantle source. An arc environment is favoured as a tectonic setting for the Mount Orford ophiolite complex.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0009-2541(89)90138-1</doi><tpages>15</tpages></addata></record> |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Chondrites Crystalline rocks Earth sciences Earth, ocean, space Exact sciences and technology Geochemistry Igneous and metamorphic rocks petrology, volcanic processes, magmas Soil and rock geochemistry |
| title | Geochemistry of Mount Orford ophiolite complex, Northern Appalachians, Canada |
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