Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism
There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time‐integrated U/Pb (HIMU)‐like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic...
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| Veröffentlicht in: | Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2014-09, Vol.15 (9), p.3477-3501 |
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| creator | Scott, J. M. Waight, T. E. van der Meer, Q. H. A. Palin, J. M. Cooper, A. F. Münker, C. |
| description | There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time‐integrated U/Pb (HIMU)‐like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic mantle xenoliths from 25 localities across Zealandia permits the first comprehensive regional description of the subcontinental lithospheric mantle (SCLM) and insights into whether it could be a source to the intraplate basalts. Contrary to previous assumptions, the Oligocene‐Miocene Zealandia SCLM is highly heterogeneous. It is composed of a refractory craton‐like domain (West Otago) adjacent to several moderately fertile domains (East Otago, North Otago, Auckland Islands). Each domain has an early history decoupled from the overlying Carboniferous and younger continental crust, and each domain has undergone varying degrees of depletion followed by enrichment. Clinopyroxene grains reveal trace element characteristics (low Ti/Eu, high Th/U) consistent with enrichment through reaction with carbonatite. This metasomatic overprint has a composition that closely matches HIMU in Sr, Pb ± Nd isotopes. However, clinopyroxene Hf isotopes are in part highly radiogenic and decoupled from the other isotope systems, and also mostly more radiogenic than the intraplate basalts. If the studied spinel facies xenoliths are representative of the thin Zealandia SCLM, the melting of garnet facies lithosphere could only be the intraplate basalt source if it had a less radiogenic Hf‐Nd isotope composition than the investigated spinel facies, or was mixed with asthenosphere‐derived melts containing less radiogenic Hf.
Key Points
SCLM beneath young Zealandia continent is ancient and regionally heterogeneous
Carbonatite metasomatism has imparted a HIMU‐like composition
Inspected SCLM has not directly contributed to the intraplate basalts |
| doi_str_mv | 10.1002/2014GC005300 |
| format | Article |
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Key Points
SCLM beneath young Zealandia continent is ancient and regionally heterogeneous
Carbonatite metasomatism has imparted a HIMU‐like composition
Inspected SCLM has not directly contributed to the intraplate basalts</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1002/2014GC005300</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Asthenosphere ; Basalt ; Carboniferous ; Continental crust ; Cratons ; Depletion ; Fertility ; Garnet ; History ; Islands ; Isotope composition ; Isotopes ; Lithosphere ; Magma ; Mantle ; mantle lithosphere ; Melting ; Miocene ; Oligocene ; Permits ; Sedimentary facies ; Trace elements ; Zealandia</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2014-09, Vol.15 (9), p.3477-3501</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a6037-b602e1e325885e4a0500894a492572878c0ac935e48174bfd4887a64f70d12143</citedby><cites>FETCH-LOGICAL-a6037-b602e1e325885e4a0500894a492572878c0ac935e48174bfd4887a64f70d12143</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2014GC005300$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2014GC005300$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,11542,27903,27904,45553,45554,46031,46455</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1002%2F2014GC005300$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Scott, J. M.</creatorcontrib><creatorcontrib>Waight, T. E.</creatorcontrib><creatorcontrib>van der Meer, Q. H. A.</creatorcontrib><creatorcontrib>Palin, J. M.</creatorcontrib><creatorcontrib>Cooper, A. F.</creatorcontrib><creatorcontrib>Münker, C.</creatorcontrib><title>Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism</title><title>Geochemistry, geophysics, geosystems : G3</title><addtitle>Geochem. Geophys. Geosyst</addtitle><description>There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time‐integrated U/Pb (HIMU)‐like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic mantle xenoliths from 25 localities across Zealandia permits the first comprehensive regional description of the subcontinental lithospheric mantle (SCLM) and insights into whether it could be a source to the intraplate basalts. Contrary to previous assumptions, the Oligocene‐Miocene Zealandia SCLM is highly heterogeneous. It is composed of a refractory craton‐like domain (West Otago) adjacent to several moderately fertile domains (East Otago, North Otago, Auckland Islands). Each domain has an early history decoupled from the overlying Carboniferous and younger continental crust, and each domain has undergone varying degrees of depletion followed by enrichment. Clinopyroxene grains reveal trace element characteristics (low Ti/Eu, high Th/U) consistent with enrichment through reaction with carbonatite. This metasomatic overprint has a composition that closely matches HIMU in Sr, Pb ± Nd isotopes. However, clinopyroxene Hf isotopes are in part highly radiogenic and decoupled from the other isotope systems, and also mostly more radiogenic than the intraplate basalts. If the studied spinel facies xenoliths are representative of the thin Zealandia SCLM, the melting of garnet facies lithosphere could only be the intraplate basalt source if it had a less radiogenic Hf‐Nd isotope composition than the investigated spinel facies, or was mixed with asthenosphere‐derived melts containing less radiogenic Hf.
Key Points
SCLM beneath young Zealandia continent is ancient and regionally heterogeneous
Carbonatite metasomatism has imparted a HIMU‐like composition
Inspected SCLM has not directly contributed to the intraplate basalts</description><subject>Asthenosphere</subject><subject>Basalt</subject><subject>Carboniferous</subject><subject>Continental crust</subject><subject>Cratons</subject><subject>Depletion</subject><subject>Fertility</subject><subject>Garnet</subject><subject>History</subject><subject>Islands</subject><subject>Isotope composition</subject><subject>Isotopes</subject><subject>Lithosphere</subject><subject>Magma</subject><subject>Mantle</subject><subject>mantle lithosphere</subject><subject>Melting</subject><subject>Miocene</subject><subject>Oligocene</subject><subject>Permits</subject><subject>Sedimentary facies</subject><subject>Trace elements</subject><subject>Zealandia</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9kU1vEzEQQFcIJErgxg-wxIUDC-Nv7xFF7baiBVVQIfViOZtJ43bXTm1HEK78cRwFoYpDT-Ox3xvbM03zmsJ7CsA-MKCinwNIDvCkOaKSyZYB008frJ83L3K-hUpKaY6a3xdYXI6TK_4XLokLg8dQyOjLOubNGpMfyORCGZEsMKAra1LWSHZxG27INbrRhaV3ZPJDikMMxYe9XjeJL5mkWD0fyOnZxVU7-rt9UpLbjK5gLXuzvzZPL5tnKzdmfPU3zpqrk-Nv89P2_Et_Nv943joFXLcLBQwpciaNkSgcSADTCSc6JjUz2gzgho7XI0O1WKyWwhjtlFhpWFJGBZ81bw91NynebzEXO_k84Fj_gHGbLVWMKapM7d-sefMfehu3KdTXWdpRrbnpNDxKKSE5p0bxSr07ULVFOSdc2U3yk0s7S8Hu52Yfzq3i_ID_8CPuHmVt3_fHDKTQ1WoPls8Ff_6zXLqzSnMt7ffPvdWXl-rryfUn2_M_NyanDw</recordid><startdate>201409</startdate><enddate>201409</enddate><creator>Scott, J. M.</creator><creator>Waight, T. E.</creator><creator>van der Meer, Q. H. A.</creator><creator>Palin, J. M.</creator><creator>Cooper, A. F.</creator><creator>Münker, C.</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>201409</creationdate><title>Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism</title><author>Scott, J. M. ; Waight, T. E. ; van der Meer, Q. H. A. ; Palin, J. M. ; Cooper, A. F. ; Münker, C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a6037-b602e1e325885e4a0500894a492572878c0ac935e48174bfd4887a64f70d12143</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Asthenosphere</topic><topic>Basalt</topic><topic>Carboniferous</topic><topic>Continental crust</topic><topic>Cratons</topic><topic>Depletion</topic><topic>Fertility</topic><topic>Garnet</topic><topic>History</topic><topic>Islands</topic><topic>Isotope composition</topic><topic>Isotopes</topic><topic>Lithosphere</topic><topic>Magma</topic><topic>Mantle</topic><topic>mantle lithosphere</topic><topic>Melting</topic><topic>Miocene</topic><topic>Oligocene</topic><topic>Permits</topic><topic>Sedimentary facies</topic><topic>Trace elements</topic><topic>Zealandia</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Scott, J. M.</creatorcontrib><creatorcontrib>Waight, T. E.</creatorcontrib><creatorcontrib>van der Meer, Q. H. A.</creatorcontrib><creatorcontrib>Palin, J. M.</creatorcontrib><creatorcontrib>Cooper, A. F.</creatorcontrib><creatorcontrib>Münker, C.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</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>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Scott, J. M.</au><au>Waight, T. E.</au><au>van der Meer, Q. H. A.</au><au>Palin, J. M.</au><au>Cooper, A. F.</au><au>Münker, C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><addtitle>Geochem. Geophys. Geosyst</addtitle><date>2014-09</date><risdate>2014</risdate><volume>15</volume><issue>9</issue><spage>3477</spage><epage>3501</epage><pages>3477-3501</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time‐integrated U/Pb (HIMU)‐like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic mantle xenoliths from 25 localities across Zealandia permits the first comprehensive regional description of the subcontinental lithospheric mantle (SCLM) and insights into whether it could be a source to the intraplate basalts. Contrary to previous assumptions, the Oligocene‐Miocene Zealandia SCLM is highly heterogeneous. It is composed of a refractory craton‐like domain (West Otago) adjacent to several moderately fertile domains (East Otago, North Otago, Auckland Islands). Each domain has an early history decoupled from the overlying Carboniferous and younger continental crust, and each domain has undergone varying degrees of depletion followed by enrichment. Clinopyroxene grains reveal trace element characteristics (low Ti/Eu, high Th/U) consistent with enrichment through reaction with carbonatite. This metasomatic overprint has a composition that closely matches HIMU in Sr, Pb ± Nd isotopes. However, clinopyroxene Hf isotopes are in part highly radiogenic and decoupled from the other isotope systems, and also mostly more radiogenic than the intraplate basalts. If the studied spinel facies xenoliths are representative of the thin Zealandia SCLM, the melting of garnet facies lithosphere could only be the intraplate basalt source if it had a less radiogenic Hf‐Nd isotope composition than the investigated spinel facies, or was mixed with asthenosphere‐derived melts containing less radiogenic Hf.
Key Points
SCLM beneath young Zealandia continent is ancient and regionally heterogeneous
Carbonatite metasomatism has imparted a HIMU‐like composition
Inspected SCLM has not directly contributed to the intraplate basalts</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014GC005300</doi><tpages>25</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Geochemistry, geophysics, geosystems : G3, 2014-09, Vol.15 (9), p.3477-3501 |
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| language | eng |
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| source | Wiley Online Library Open Access |
| subjects | Asthenosphere Basalt Carboniferous Continental crust Cratons Depletion Fertility Garnet History Islands Isotope composition Isotopes Lithosphere Magma Mantle mantle lithosphere Melting Miocene Oligocene Permits Sedimentary facies Trace elements Zealandia |
| title | Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism |
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