Loading…
The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)
Belonging to the huge Ouarzazate volcanic Group that covered the whole Anti-Atlas during the late Ediacaran (580-545 Ma), the Tifnoute valley volcanic formations are mainly pyroclastic and show a large composition, from trachybasalt to rhyolite and are crosscut by dolerite dykes. The Tifnoute valley...
Saved in:
| Published in: | Journal of African earth sciences (1994) 2017-03, Vol.127, p.113-135 |
|---|---|
| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| cited_by | cdi_FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33 |
|---|---|
| cites | cdi_FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33 |
| container_end_page | 135 |
| container_issue | |
| container_start_page | 113 |
| container_title | Journal of African earth sciences (1994) |
| container_volume | 127 |
| creator | Belkacim, Said Gasquet, Dominique Liégeois, Jean-Paul Arai, Shoji Gahlan, Hisham A. Ahmed, Hassan Ishida, Yoshito Ikenne, Moha |
| description | Belonging to the huge Ouarzazate volcanic Group that covered the whole Anti-Atlas during the late Ediacaran (580-545 Ma), the Tifnoute valley volcanic formations are mainly pyroclastic and show a large composition, from trachybasalt to rhyolite and are crosscut by dolerite dykes. The Tifnoute valley volcanic rocks are located within a rigid salient of the Anti-Atlas that gives them special extreme characteristics. Due to the heavy greenschist alteration that affects this volcanic group, we focused the more immobile elements, but as REE can also be affected, we used the composition of unaltered clinopyroxene crystals to determine the nature of these volcanic rocks. The clinopyroxene is an augite diopside in the basalt, an augite in the andesite and an augite-salite in the dolerite. Petrography of the Tifnoute mafic volcanic rocks and clinopyroxene compositions indicate the presence of two magmatic series: (i) older high-K calc-alkaline (alkali-calcic) andesite and basalt characterized by the early crystallization of Fe-Ti oxides and of the late fractionation of plagioclase, the modal proportion of the latter increasing from the basalt to the andesite and (ii) younger alkalic dolerite dykes. With clinopyroxene trace element compositions obtained using laser ablation ICP-MS, we calculated the composition of the melts in equilibrium with the pyroxenes.
The volcanic rocks of the Tifnoute Valley have positive εNd570 (+1.7 to +5.0), low Sri ( |
| doi_str_mv | 10.1016/j.jafrearsci.2016.08.002 |
| format | article |
| fullrecord | <record><control><sourceid>elsevier_hal_p</sourceid><recordid>TN_cdi_hal_primary_oai_HAL_hal_01898441v1</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S1464343X16302576</els_id><sourcerecordid>S1464343X16302576</sourcerecordid><originalsourceid>FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33</originalsourceid><addsrcrecordid>eNqFUU1vEzEQXSGQKIX_4GMjdRc7-80tRKVFCvTQIHGzZm0v69TriWwnZfOb-RF4SQVHLrY1772ZN35JQhjNGGXV-122g94pcF7obBkrGW0ySpcvkgvW1G3K2rJ6Gd9FVaR5kX9_nbzxfhcJbVMsL5Jf20GRG6lBgANLjmgEWC2IQ_HoCVhJwHsUGoKSZIQ-QnJ6VJ5gT0KU3h_AneAUYXLr8LAnVysbdLoKBvw1-YKxj8DFB7I22uJ-cvhTWUUEjnv0Omi01-RpQKPSeSD5oVAMatQ-uOnP8AeXfpVEewy4j0MF2giBtsGT3uH4bOGkjAE3pA86WgDiwWhlA7na6t7iIVo7gjFqWrxNXvVgvHr3fF8m3z7dbNd36eb-9vN6tUkhr8swn23T0q7oWyo7KVtaUQk9y0vWsY4K2quurJo8ZzWVrGQFYyxnTVfQtqxryPPLZHHuO4Dhe6dHcBNH0PxuteFzjbImfn_BjixymzNXOPTeqf6vgFE-J8x3_F_CfE6Y04bHAKP041mq4i5HrRyPDGWFktopEbhE_f8mvwH-QLlc</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)</title><source>ScienceDirect Journals</source><creator>Belkacim, Said ; Gasquet, Dominique ; Liégeois, Jean-Paul ; Arai, Shoji ; Gahlan, Hisham A. ; Ahmed, Hassan ; Ishida, Yoshito ; Ikenne, Moha</creator><creatorcontrib>Belkacim, Said ; Gasquet, Dominique ; Liégeois, Jean-Paul ; Arai, Shoji ; Gahlan, Hisham A. ; Ahmed, Hassan ; Ishida, Yoshito ; Ikenne, Moha</creatorcontrib><description>Belonging to the huge Ouarzazate volcanic Group that covered the whole Anti-Atlas during the late Ediacaran (580-545 Ma), the Tifnoute valley volcanic formations are mainly pyroclastic and show a large composition, from trachybasalt to rhyolite and are crosscut by dolerite dykes. The Tifnoute valley volcanic rocks are located within a rigid salient of the Anti-Atlas that gives them special extreme characteristics. Due to the heavy greenschist alteration that affects this volcanic group, we focused the more immobile elements, but as REE can also be affected, we used the composition of unaltered clinopyroxene crystals to determine the nature of these volcanic rocks. The clinopyroxene is an augite diopside in the basalt, an augite in the andesite and an augite-salite in the dolerite. Petrography of the Tifnoute mafic volcanic rocks and clinopyroxene compositions indicate the presence of two magmatic series: (i) older high-K calc-alkaline (alkali-calcic) andesite and basalt characterized by the early crystallization of Fe-Ti oxides and of the late fractionation of plagioclase, the modal proportion of the latter increasing from the basalt to the andesite and (ii) younger alkalic dolerite dykes. With clinopyroxene trace element compositions obtained using laser ablation ICP-MS, we calculated the composition of the melts in equilibrium with the pyroxenes.
The volcanic rocks of the Tifnoute Valley have positive εNd570 (+1.7 to +5.0), low Sri (<0.7063), and NdTDM model ages ranging from 0.80 to 1.14 Ga, indicating a mostly depleted Neoproterozoic source with limited involvement of the Eburnian lithosphere for the Tifnoute magmas. This depleted source is the young lithospheric mantle for the alkali-calcic series and the asthenosphere for the younger alkalic series. The Tifnoute Valley volcanic rocks emplaced in a Pan-African transtensive post-collisional environment that evolved towards the major rifting event that will give rise to the Rheic ocean, in a similar way to what occurred just after the Variscan orogeny during the Triassic period that evolved to the Tethys ocean opening.
•The Ediacaran volcanic rocks and the mafic dykes from Tifnoute Valley (TV) belong to HKCA/alkali-calcic and alkalic series.•The TV lavas display geochemical features of subduction-related rocks, and are interpreted as old inherited characters.•Studied rocks have positive εNd560, low Sri, and NdTDM model ages (0.80 to 1.14 Ga), indicating a mostly depleted source.•TV rocks are emplaced in a Pan-African transtensive post-collisional environment that will give rise to the Rheic ocean.</description><identifier>ISSN: 1464-343X</identifier><identifier>EISSN: 1879-1956</identifier><identifier>DOI: 10.1016/j.jafrearsci.2016.08.002</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Biodiversity and Ecology ; Clinopyroxene chemistry ; Ediacaran volcanism ; Environment and Society ; Environmental Engineering ; Environmental Sciences ; Geodynamics ; Geography ; Global Changes ; Humanities and Social Sciences ; Morocco ; Nd-Sr isotopes ; Ouarzazate Supergroup ; Ouzellarh-Siroua salient ; Tifnoute valley</subject><ispartof>Journal of African earth sciences (1994), 2017-03, Vol.127, p.113-135</ispartof><rights>2016 Elsevier Ltd</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33</citedby><cites>FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33</cites><orcidid>0000-0001-9583-6203</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,315,786,790,891,27957,27958</link.rule.ids><backlink>$$Uhttps://hal.science/hal-01898441$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Belkacim, Said</creatorcontrib><creatorcontrib>Gasquet, Dominique</creatorcontrib><creatorcontrib>Liégeois, Jean-Paul</creatorcontrib><creatorcontrib>Arai, Shoji</creatorcontrib><creatorcontrib>Gahlan, Hisham A.</creatorcontrib><creatorcontrib>Ahmed, Hassan</creatorcontrib><creatorcontrib>Ishida, Yoshito</creatorcontrib><creatorcontrib>Ikenne, Moha</creatorcontrib><title>The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)</title><title>Journal of African earth sciences (1994)</title><description>Belonging to the huge Ouarzazate volcanic Group that covered the whole Anti-Atlas during the late Ediacaran (580-545 Ma), the Tifnoute valley volcanic formations are mainly pyroclastic and show a large composition, from trachybasalt to rhyolite and are crosscut by dolerite dykes. The Tifnoute valley volcanic rocks are located within a rigid salient of the Anti-Atlas that gives them special extreme characteristics. Due to the heavy greenschist alteration that affects this volcanic group, we focused the more immobile elements, but as REE can also be affected, we used the composition of unaltered clinopyroxene crystals to determine the nature of these volcanic rocks. The clinopyroxene is an augite diopside in the basalt, an augite in the andesite and an augite-salite in the dolerite. Petrography of the Tifnoute mafic volcanic rocks and clinopyroxene compositions indicate the presence of two magmatic series: (i) older high-K calc-alkaline (alkali-calcic) andesite and basalt characterized by the early crystallization of Fe-Ti oxides and of the late fractionation of plagioclase, the modal proportion of the latter increasing from the basalt to the andesite and (ii) younger alkalic dolerite dykes. With clinopyroxene trace element compositions obtained using laser ablation ICP-MS, we calculated the composition of the melts in equilibrium with the pyroxenes.
The volcanic rocks of the Tifnoute Valley have positive εNd570 (+1.7 to +5.0), low Sri (<0.7063), and NdTDM model ages ranging from 0.80 to 1.14 Ga, indicating a mostly depleted Neoproterozoic source with limited involvement of the Eburnian lithosphere for the Tifnoute magmas. This depleted source is the young lithospheric mantle for the alkali-calcic series and the asthenosphere for the younger alkalic series. The Tifnoute Valley volcanic rocks emplaced in a Pan-African transtensive post-collisional environment that evolved towards the major rifting event that will give rise to the Rheic ocean, in a similar way to what occurred just after the Variscan orogeny during the Triassic period that evolved to the Tethys ocean opening.
•The Ediacaran volcanic rocks and the mafic dykes from Tifnoute Valley (TV) belong to HKCA/alkali-calcic and alkalic series.•The TV lavas display geochemical features of subduction-related rocks, and are interpreted as old inherited characters.•Studied rocks have positive εNd560, low Sri, and NdTDM model ages (0.80 to 1.14 Ga), indicating a mostly depleted source.•TV rocks are emplaced in a Pan-African transtensive post-collisional environment that will give rise to the Rheic ocean.</description><subject>Biodiversity and Ecology</subject><subject>Clinopyroxene chemistry</subject><subject>Ediacaran volcanism</subject><subject>Environment and Society</subject><subject>Environmental Engineering</subject><subject>Environmental Sciences</subject><subject>Geodynamics</subject><subject>Geography</subject><subject>Global Changes</subject><subject>Humanities and Social Sciences</subject><subject>Morocco</subject><subject>Nd-Sr isotopes</subject><subject>Ouarzazate Supergroup</subject><subject>Ouzellarh-Siroua salient</subject><subject>Tifnoute valley</subject><issn>1464-343X</issn><issn>1879-1956</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqFUU1vEzEQXSGQKIX_4GMjdRc7-80tRKVFCvTQIHGzZm0v69TriWwnZfOb-RF4SQVHLrY1772ZN35JQhjNGGXV-122g94pcF7obBkrGW0ySpcvkgvW1G3K2rJ6Gd9FVaR5kX9_nbzxfhcJbVMsL5Jf20GRG6lBgANLjmgEWC2IQ_HoCVhJwHsUGoKSZIQ-QnJ6VJ5gT0KU3h_AneAUYXLr8LAnVysbdLoKBvw1-YKxj8DFB7I22uJ-cvhTWUUEjnv0Omi01-RpQKPSeSD5oVAMatQ-uOnP8AeXfpVEewy4j0MF2giBtsGT3uH4bOGkjAE3pA86WgDiwWhlA7na6t7iIVo7gjFqWrxNXvVgvHr3fF8m3z7dbNd36eb-9vN6tUkhr8swn23T0q7oWyo7KVtaUQk9y0vWsY4K2quurJo8ZzWVrGQFYyxnTVfQtqxryPPLZHHuO4Dhe6dHcBNH0PxuteFzjbImfn_BjixymzNXOPTeqf6vgFE-J8x3_F_CfE6Y04bHAKP041mq4i5HrRyPDGWFktopEbhE_f8mvwH-QLlc</recordid><startdate>201703</startdate><enddate>201703</enddate><creator>Belkacim, Said</creator><creator>Gasquet, Dominique</creator><creator>Liégeois, Jean-Paul</creator><creator>Arai, Shoji</creator><creator>Gahlan, Hisham A.</creator><creator>Ahmed, Hassan</creator><creator>Ishida, Yoshito</creator><creator>Ikenne, Moha</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><scope>BXJBU</scope><orcidid>https://orcid.org/0000-0001-9583-6203</orcidid></search><sort><creationdate>201703</creationdate><title>The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)</title><author>Belkacim, Said ; Gasquet, Dominique ; Liégeois, Jean-Paul ; Arai, Shoji ; Gahlan, Hisham A. ; Ahmed, Hassan ; Ishida, Yoshito ; Ikenne, Moha</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Biodiversity and Ecology</topic><topic>Clinopyroxene chemistry</topic><topic>Ediacaran volcanism</topic><topic>Environment and Society</topic><topic>Environmental Engineering</topic><topic>Environmental Sciences</topic><topic>Geodynamics</topic><topic>Geography</topic><topic>Global Changes</topic><topic>Humanities and Social Sciences</topic><topic>Morocco</topic><topic>Nd-Sr isotopes</topic><topic>Ouarzazate Supergroup</topic><topic>Ouzellarh-Siroua salient</topic><topic>Tifnoute valley</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Belkacim, Said</creatorcontrib><creatorcontrib>Gasquet, Dominique</creatorcontrib><creatorcontrib>Liégeois, Jean-Paul</creatorcontrib><creatorcontrib>Arai, Shoji</creatorcontrib><creatorcontrib>Gahlan, Hisham A.</creatorcontrib><creatorcontrib>Ahmed, Hassan</creatorcontrib><creatorcontrib>Ishida, Yoshito</creatorcontrib><creatorcontrib>Ikenne, Moha</creatorcontrib><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>HAL-SHS: Archive ouverte en Sciences de l'Homme et de la Société</collection><jtitle>Journal of African earth sciences (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Belkacim, Said</au><au>Gasquet, Dominique</au><au>Liégeois, Jean-Paul</au><au>Arai, Shoji</au><au>Gahlan, Hisham A.</au><au>Ahmed, Hassan</au><au>Ishida, Yoshito</au><au>Ikenne, Moha</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley)</atitle><jtitle>Journal of African earth sciences (1994)</jtitle><date>2017-03</date><risdate>2017</risdate><volume>127</volume><spage>113</spage><epage>135</epage><pages>113-135</pages><issn>1464-343X</issn><eissn>1879-1956</eissn><abstract>Belonging to the huge Ouarzazate volcanic Group that covered the whole Anti-Atlas during the late Ediacaran (580-545 Ma), the Tifnoute valley volcanic formations are mainly pyroclastic and show a large composition, from trachybasalt to rhyolite and are crosscut by dolerite dykes. The Tifnoute valley volcanic rocks are located within a rigid salient of the Anti-Atlas that gives them special extreme characteristics. Due to the heavy greenschist alteration that affects this volcanic group, we focused the more immobile elements, but as REE can also be affected, we used the composition of unaltered clinopyroxene crystals to determine the nature of these volcanic rocks. The clinopyroxene is an augite diopside in the basalt, an augite in the andesite and an augite-salite in the dolerite. Petrography of the Tifnoute mafic volcanic rocks and clinopyroxene compositions indicate the presence of two magmatic series: (i) older high-K calc-alkaline (alkali-calcic) andesite and basalt characterized by the early crystallization of Fe-Ti oxides and of the late fractionation of plagioclase, the modal proportion of the latter increasing from the basalt to the andesite and (ii) younger alkalic dolerite dykes. With clinopyroxene trace element compositions obtained using laser ablation ICP-MS, we calculated the composition of the melts in equilibrium with the pyroxenes.
The volcanic rocks of the Tifnoute Valley have positive εNd570 (+1.7 to +5.0), low Sri (<0.7063), and NdTDM model ages ranging from 0.80 to 1.14 Ga, indicating a mostly depleted Neoproterozoic source with limited involvement of the Eburnian lithosphere for the Tifnoute magmas. This depleted source is the young lithospheric mantle for the alkali-calcic series and the asthenosphere for the younger alkalic series. The Tifnoute Valley volcanic rocks emplaced in a Pan-African transtensive post-collisional environment that evolved towards the major rifting event that will give rise to the Rheic ocean, in a similar way to what occurred just after the Variscan orogeny during the Triassic period that evolved to the Tethys ocean opening.
•The Ediacaran volcanic rocks and the mafic dykes from Tifnoute Valley (TV) belong to HKCA/alkali-calcic and alkalic series.•The TV lavas display geochemical features of subduction-related rocks, and are interpreted as old inherited characters.•Studied rocks have positive εNd560, low Sri, and NdTDM model ages (0.80 to 1.14 Ga), indicating a mostly depleted source.•TV rocks are emplaced in a Pan-African transtensive post-collisional environment that will give rise to the Rheic ocean.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jafrearsci.2016.08.002</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0001-9583-6203</orcidid></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1464-343X |
| ispartof | Journal of African earth sciences (1994), 2017-03, Vol.127, p.113-135 |
| issn | 1464-343X 1879-1956 |
| language | eng |
| recordid | cdi_hal_primary_oai_HAL_hal_01898441v1 |
| source | ScienceDirect Journals |
| subjects | Biodiversity and Ecology Clinopyroxene chemistry Ediacaran volcanism Environment and Society Environmental Engineering Environmental Sciences Geodynamics Geography Global Changes Humanities and Social Sciences Morocco Nd-Sr isotopes Ouarzazate Supergroup Ouzellarh-Siroua salient Tifnoute valley |
| title | The Ediacaran volcanic rocks and associated mafic dykes of the Ouarzazate Group (Anti-Atlas, Morocco): Clinopyroxene composition, whole-rock geochemistry and Sr-Nd isotopes constraints from the Ouzellarh-Siroua salient (Tifnoute valley) |
| url | http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-09-21T11%3A32%3A58IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-elsevier_hal_p&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=The%20Ediacaran%20volcanic%20rocks%20and%20associated%20mafic%20dykes%20of%20the%20Ouarzazate%20Group%20(Anti-Atlas,%20Morocco):%20Clinopyroxene%20composition,%20whole-rock%20geochemistry%20and%20Sr-Nd%20isotopes%20constraints%20from%20the%20Ouzellarh-Siroua%20salient%20(Tifnoute%20valley)&rft.jtitle=Journal%20of%20African%20earth%20sciences%20(1994)&rft.au=Belkacim,%20Said&rft.date=2017-03&rft.volume=127&rft.spage=113&rft.epage=135&rft.pages=113-135&rft.issn=1464-343X&rft.eissn=1879-1956&rft_id=info:doi/10.1016/j.jafrearsci.2016.08.002&rft_dat=%3Celsevier_hal_p%3ES1464343X16302576%3C/elsevier_hal_p%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-a375t-a379890b4f90dbdd9060daf1351b1b0c0feb56833170d1514111318b409577a33%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true |