A Rhyolite Compositional Continuum Governed by Lower Crustal Source Conditions in the Taupo Volcanic Zone, New Zealand
Rhyolites generated in the modern Taupo Volcanic Zone (TVZ), New Zealand, have previously been interpreted as having evolved by a combination of extensive fractional crystallization of mantle-derived mafic magmas and limited crustal assimilation (up to 25%). Polytopic vector analysis (PVA), a form o...
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| Veröffentlicht in: | Journal of petrology 2008-12, Vol.49 (12), p.2245-2276 |
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| creator | Deering, C. D. Cole, J. W. Vogel, T. A. |
| description | Rhyolites generated in the modern Taupo Volcanic Zone (TVZ), New Zealand, have previously been interpreted as having evolved by a combination of extensive fractional crystallization of mantle-derived mafic magmas and limited crustal assimilation (up to 25%). Polytopic vector analysis (PVA), a form of multivariate statistical analysis, of the major-element compositions of over 475 basaltic to rhyolitic bulk-rock samples, representing over 600 kyr of volcanism within the TVZ, has provided a robust platform for rhyolite characterization and new insights into rhyolite petrogenesis. There is a continuum of compositions between two rhyolite end-member magma types (EM1 and EM2), which have been identified on the basis of the PVA and which have distinct petrological and geochemical characteristics, as follows. EM1: crystal-rich (up to 45%), hydrous phases (± hornblende ± biotite ± cummingtonite), high Aluminum Saturation Index [ASI; molar Al2O3/(CaO + Na2O + K2O)], low FeO*/MgO (calc-alkaline series), depleted abundances of middle rare earth elements (MREE) and Y, and high Sr; EM2: crystal-poor ( |
| doi_str_mv | 10.1093/petrology/egn067 |
| format | Article |
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D. ; Cole, J. W. ; Vogel, T. A.</creator><creatorcontrib>Deering, C. D. ; Cole, J. W. ; Vogel, T. A.</creatorcontrib><description>Rhyolites generated in the modern Taupo Volcanic Zone (TVZ), New Zealand, have previously been interpreted as having evolved by a combination of extensive fractional crystallization of mantle-derived mafic magmas and limited crustal assimilation (up to 25%). Polytopic vector analysis (PVA), a form of multivariate statistical analysis, of the major-element compositions of over 475 basaltic to rhyolitic bulk-rock samples, representing over 600 kyr of volcanism within the TVZ, has provided a robust platform for rhyolite characterization and new insights into rhyolite petrogenesis. There is a continuum of compositions between two rhyolite end-member magma types (EM1 and EM2), which have been identified on the basis of the PVA and which have distinct petrological and geochemical characteristics, as follows. EM1: crystal-rich (up to 45%), hydrous phases (± hornblende ± biotite ± cummingtonite), high Aluminum Saturation Index [ASI; molar Al2O3/(CaO + Na2O + K2O)], low FeO*/MgO (calc-alkaline series), depleted abundances of middle rare earth elements (MREE) and Y, and high Sr; EM2: crystal-poor (<10%), anhydrous phases (orthopyroxene ± clinopyroxene), high FeO*/MgO (tholeiitic series), low ASI, less depleted MREE and Y, and low Sr. The range of ASI values, and relative depletion in MREE and Y in the rhyolites is consistent with the results of experiments to constrain the partial melting behaviour of amphibolite at crustal pressures. The major- and trace-element data are also consistent with 50–60% equilibrium crystallization of a crustally contaminated, hornblende-bearing andesite to produce the TVZ rhyolites. Distinct major- and trace-element variations along the continuum between the two rhyolite end-member types can be effectively modelled by simulating changes in the temperature–fO2–fH2O conditions in the lower crust where mantle-derived mafic magmas are stored and differentiate. Low T and high fO2 and fH2O in the crustal magma storage zone promote abundant hornblende crystallization and suppress plagioclase crystallization, which produces the EM1 type rhyolite. By increasing the temperature and/or lowering fO2 and fH2O in the magma storage region, plagioclase becomes more dominant and hornblende crystallization is suppressed, producing more EM2-like rhyolitic magma types.</description><identifier>ISSN: 0022-3530</identifier><identifier>EISSN: 1460-2415</identifier><identifier>DOI: 10.1093/petrology/egn067</identifier><language>eng</language><publisher>Oxford: Oxford University Press</publisher><subject>magma genesis ; polytopic vector analysis ; rhyolite ; Taupo Volcanic Zone ; water</subject><ispartof>Journal of petrology, 2008-12, Vol.49 (12), p.2245-2276</ispartof><rights>The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org 2008</rights><rights>The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a475t-aecdf6debe3a1fd74a100cb89751378aa10131f5357cf487f2f03b08b90414d3</citedby><cites>FETCH-LOGICAL-a475t-aecdf6debe3a1fd74a100cb89751378aa10131f5357cf487f2f03b08b90414d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785,1585,27929,27930</link.rule.ids></links><search><creatorcontrib>Deering, C. D.</creatorcontrib><creatorcontrib>Cole, J. W.</creatorcontrib><creatorcontrib>Vogel, T. A.</creatorcontrib><title>A Rhyolite Compositional Continuum Governed by Lower Crustal Source Conditions in the Taupo Volcanic Zone, New Zealand</title><title>Journal of petrology</title><description>Rhyolites generated in the modern Taupo Volcanic Zone (TVZ), New Zealand, have previously been interpreted as having evolved by a combination of extensive fractional crystallization of mantle-derived mafic magmas and limited crustal assimilation (up to 25%). Polytopic vector analysis (PVA), a form of multivariate statistical analysis, of the major-element compositions of over 475 basaltic to rhyolitic bulk-rock samples, representing over 600 kyr of volcanism within the TVZ, has provided a robust platform for rhyolite characterization and new insights into rhyolite petrogenesis. There is a continuum of compositions between two rhyolite end-member magma types (EM1 and EM2), which have been identified on the basis of the PVA and which have distinct petrological and geochemical characteristics, as follows. EM1: crystal-rich (up to 45%), hydrous phases (± hornblende ± biotite ± cummingtonite), high Aluminum Saturation Index [ASI; molar Al2O3/(CaO + Na2O + K2O)], low FeO*/MgO (calc-alkaline series), depleted abundances of middle rare earth elements (MREE) and Y, and high Sr; EM2: crystal-poor (<10%), anhydrous phases (orthopyroxene ± clinopyroxene), high FeO*/MgO (tholeiitic series), low ASI, less depleted MREE and Y, and low Sr. The range of ASI values, and relative depletion in MREE and Y in the rhyolites is consistent with the results of experiments to constrain the partial melting behaviour of amphibolite at crustal pressures. The major- and trace-element data are also consistent with 50–60% equilibrium crystallization of a crustally contaminated, hornblende-bearing andesite to produce the TVZ rhyolites. Distinct major- and trace-element variations along the continuum between the two rhyolite end-member types can be effectively modelled by simulating changes in the temperature–fO2–fH2O conditions in the lower crust where mantle-derived mafic magmas are stored and differentiate. Low T and high fO2 and fH2O in the crustal magma storage zone promote abundant hornblende crystallization and suppress plagioclase crystallization, which produces the EM1 type rhyolite. By increasing the temperature and/or lowering fO2 and fH2O in the magma storage region, plagioclase becomes more dominant and hornblende crystallization is suppressed, producing more EM2-like rhyolitic magma types.</description><subject>magma genesis</subject><subject>polytopic vector analysis</subject><subject>rhyolite</subject><subject>Taupo Volcanic Zone</subject><subject>water</subject><issn>0022-3530</issn><issn>1460-2415</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNqNkEFP4zAQhS20SHSBO0eLKxsYx3HdHFFZKFIFAiKEerGcZAKB1M7aDtB_jyGI855Gb-Z7o5lHyAGDYwY5P-kxONvZx80JPhqYyi0yYdkUkjRj4heZAKRpwgWHHfLb-2cAFvswIa-n9PZpY7s2IJ3bdW99G1prdBeVCa0ZhjW9sK_oDNa03NClfUNH527wITJ3dnDVp9HUXzZPW0PDE9JCD72l97artGkrurIG_9ArfKMr1J029R7ZbnTncf-77pLi_G8xXyTL64vL-eky0ZkUIdFY1c20xhK5Zk0tM80AqnKWS8G4nOkoGWeN4EJWTTaTTdoAL2FW5pCxrOa75HBc2zv7b0Af1HO8OH7nVcryPE0FTyMEI1Q5673DRvWuXWu3UQzUZ7bqJ1s1ZhstR6PFDv3_0MlItz7g-w-v3YuKUynU4mGlFjdZUZwJUJJ_ADF0kAc</recordid><startdate>20081201</startdate><enddate>20081201</enddate><creator>Deering, C. D.</creator><creator>Cole, J. W.</creator><creator>Vogel, T. A.</creator><general>Oxford University Press</general><general>Oxford Publishing Limited (England)</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>JG9</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20081201</creationdate><title>A Rhyolite Compositional Continuum Governed by Lower Crustal Source Conditions in the Taupo Volcanic Zone, New Zealand</title><author>Deering, C. D. ; Cole, J. W. ; Vogel, T. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a475t-aecdf6debe3a1fd74a100cb89751378aa10131f5357cf487f2f03b08b90414d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>magma genesis</topic><topic>polytopic vector analysis</topic><topic>rhyolite</topic><topic>Taupo Volcanic Zone</topic><topic>water</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Deering, C. D.</creatorcontrib><creatorcontrib>Cole, J. W.</creatorcontrib><creatorcontrib>Vogel, T. A.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Water Resources Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of petrology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Deering, C. D.</au><au>Cole, J. W.</au><au>Vogel, T. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A Rhyolite Compositional Continuum Governed by Lower Crustal Source Conditions in the Taupo Volcanic Zone, New Zealand</atitle><jtitle>Journal of petrology</jtitle><date>2008-12-01</date><risdate>2008</risdate><volume>49</volume><issue>12</issue><spage>2245</spage><epage>2276</epage><pages>2245-2276</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract>Rhyolites generated in the modern Taupo Volcanic Zone (TVZ), New Zealand, have previously been interpreted as having evolved by a combination of extensive fractional crystallization of mantle-derived mafic magmas and limited crustal assimilation (up to 25%). Polytopic vector analysis (PVA), a form of multivariate statistical analysis, of the major-element compositions of over 475 basaltic to rhyolitic bulk-rock samples, representing over 600 kyr of volcanism within the TVZ, has provided a robust platform for rhyolite characterization and new insights into rhyolite petrogenesis. There is a continuum of compositions between two rhyolite end-member magma types (EM1 and EM2), which have been identified on the basis of the PVA and which have distinct petrological and geochemical characteristics, as follows. EM1: crystal-rich (up to 45%), hydrous phases (± hornblende ± biotite ± cummingtonite), high Aluminum Saturation Index [ASI; molar Al2O3/(CaO + Na2O + K2O)], low FeO*/MgO (calc-alkaline series), depleted abundances of middle rare earth elements (MREE) and Y, and high Sr; EM2: crystal-poor (<10%), anhydrous phases (orthopyroxene ± clinopyroxene), high FeO*/MgO (tholeiitic series), low ASI, less depleted MREE and Y, and low Sr. The range of ASI values, and relative depletion in MREE and Y in the rhyolites is consistent with the results of experiments to constrain the partial melting behaviour of amphibolite at crustal pressures. The major- and trace-element data are also consistent with 50–60% equilibrium crystallization of a crustally contaminated, hornblende-bearing andesite to produce the TVZ rhyolites. Distinct major- and trace-element variations along the continuum between the two rhyolite end-member types can be effectively modelled by simulating changes in the temperature–fO2–fH2O conditions in the lower crust where mantle-derived mafic magmas are stored and differentiate. Low T and high fO2 and fH2O in the crustal magma storage zone promote abundant hornblende crystallization and suppress plagioclase crystallization, which produces the EM1 type rhyolite. By increasing the temperature and/or lowering fO2 and fH2O in the magma storage region, plagioclase becomes more dominant and hornblende crystallization is suppressed, producing more EM2-like rhyolitic magma types.</abstract><cop>Oxford</cop><pub>Oxford University Press</pub><doi>10.1093/petrology/egn067</doi><tpages>32</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | magma genesis polytopic vector analysis rhyolite Taupo Volcanic Zone water |
| title | A Rhyolite Compositional Continuum Governed by Lower Crustal Source Conditions in the Taupo Volcanic Zone, New Zealand |
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