Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM
Isotopic fingerprinting of individual mineral phases, complemented by crystal size data, provides a unique avenue for elucidating the details of evolutionary histories of crustal magma systems. Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size...
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| Veröffentlicht in: | Journal of petrology 1999-05, Vol.40 (5), p.773 |
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| container_title | Journal of petrology |
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| creator | Knesel, Kurt M Davidson, Jon P Duffield, Wendell A |
| description | Isotopic fingerprinting of individual mineral phases, complemented by crystal size data, provides a unique avenue for elucidating the details of evolutionary histories of crustal magma systems. Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size and Sr isotopic profiles constructed through microdrill sampling of sanidine crystals from a high-silica rhyolite lava from the Taylor Creek Rhyolite, NM. Whole-rock |
| doi_str_mv | 10.1093/petrology/40.5.773 |
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Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size and Sr isotopic profiles constructed through microdrill sampling of sanidine crystals from a high-silica rhyolite lava from the Taylor Creek Rhyolite, NM. Whole-rock <87<Sr/<86<Sr increases monotonically with modal abundance of sanidine phenocrysts, suggesting Taylor Creek magma evolved through a coupled process of assimilation and crystallization. In contrast, sanidine phenocrysts do not show simple monotonic increases in <87<Sr/<86<Sr as a function of crystal size and core-to-rim stratigraphy. Instead, <87<Sr/<86<Sr ratios and Sr concentrations of individual sanidines increase with crystal size to a maximum at ~4 mm and then decrease with further increase in size. Microsampling of two crystals greater than 4 mm in length showed core-to-rim increase then decrease in <87<Sr/<86<Sr, whereas a single sanidine crystal less than 4 mm in length displayed a simple core-to-rim decrease in <87<Sr/<86<Sr. Furthermore, in contrast to measured size distributions of crystals in volcanic rocks, which commonly decrease exponentially with increasing size, crystal size frequency histograms are bell shaped, with decreasing numbers of crystals in the smallest size class. All these results are consistent with a model involving continuous phenocryst nucleation and growth in a crustally contaminated magma into which a lower-<87<Sr/<86<Sr, lower-Sr magma was injected. In such a scenario, it is argued that curved crystal size distributions mirror variations in nucleation rate in response to changes in undercooling as the magma body evolved from assimilation- to recharge-dominated regimes.]]></description><identifier>ISSN: 0022-3530</identifier><identifier>EISSN: 1460-2415</identifier><identifier>DOI: 10.1093/petrology/40.5.773</identifier><language>eng</language><publisher>Oxford: Oxford Publishing Limited (England)</publisher><ispartof>Journal of petrology, 1999-05, Vol.40 (5), p.773</ispartof><rights>Copyright Oxford University Press(England) May 1999</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></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>Knesel, Kurt M</creatorcontrib><creatorcontrib>Davidson, Jon P</creatorcontrib><creatorcontrib>Duffield, Wendell A</creatorcontrib><title>Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM</title><title>Journal of petrology</title><description><![CDATA[Isotopic fingerprinting of individual mineral phases, complemented by crystal size data, provides a unique avenue for elucidating the details of evolutionary histories of crustal magma systems. Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size and Sr isotopic profiles constructed through microdrill sampling of sanidine crystals from a high-silica rhyolite lava from the Taylor Creek Rhyolite, NM. Whole-rock <87<Sr/<86<Sr increases monotonically with modal abundance of sanidine phenocrysts, suggesting Taylor Creek magma evolved through a coupled process of assimilation and crystallization. In contrast, sanidine phenocrysts do not show simple monotonic increases in <87<Sr/<86<Sr as a function of crystal size and core-to-rim stratigraphy. Instead, <87<Sr/<86<Sr ratios and Sr concentrations of individual sanidines increase with crystal size to a maximum at ~4 mm and then decrease with further increase in size. Microsampling of two crystals greater than 4 mm in length showed core-to-rim increase then decrease in <87<Sr/<86<Sr, whereas a single sanidine crystal less than 4 mm in length displayed a simple core-to-rim decrease in <87<Sr/<86<Sr. Furthermore, in contrast to measured size distributions of crystals in volcanic rocks, which commonly decrease exponentially with increasing size, crystal size frequency histograms are bell shaped, with decreasing numbers of crystals in the smallest size class. All these results are consistent with a model involving continuous phenocryst nucleation and growth in a crustally contaminated magma into which a lower-<87<Sr/<86<Sr, lower-Sr magma was injected. In such a scenario, it is argued that curved crystal size distributions mirror variations in nucleation rate in response to changes in undercooling as the magma body evolved from assimilation- to recharge-dominated regimes.]]></description><issn>0022-3530</issn><issn>1460-2415</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNotj8tOwzAURC0EEuXxA6yuWJPiR5zE7KqqQKXyUAtrZJybxpDaxXYq5UP4XypgNdLoaI6GkAtGx4wqcb3FFHzn18N1TsdyXJbigIxYXtCM50wekhGlnGdCCnpMTmL8oJTtezoi37Od7_pkvQPfwMp21lgDD3q90ZDa4Pt1C5MY7cZ2-pfSroZV_x7xq0eXYImm1WGNNzDb2RqdQWiC38AqwDz65LcYwTpYaWdr6xCeW3TehCGmeAUveuh8gGlA_IRlO_jOJryCx4czctToLuL5f56S19vZy_Q-WzzdzaeTRaZ5XqasxkIIqkqjCm0aJpV-56pEWpeSGpobnjdFIaWsdFFgpaqal9goJkouDTYGxSm5_NvdBr__E9Pbh--D2yvfOFOVyvOKiR_Bnmvu</recordid><startdate>19990501</startdate><enddate>19990501</enddate><creator>Knesel, Kurt M</creator><creator>Davidson, Jon P</creator><creator>Duffield, Wendell A</creator><general>Oxford Publishing Limited (England)</general><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>19990501</creationdate><title>Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM</title><author>Knesel, Kurt M ; Davidson, Jon P ; Duffield, Wendell A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a247t-de633097c96acf159ab297e0d750c04c24f665558a66e898d27ef913725cefce3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Knesel, Kurt M</creatorcontrib><creatorcontrib>Davidson, Jon P</creatorcontrib><creatorcontrib>Duffield, Wendell A</creatorcontrib><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>Knesel, Kurt M</au><au>Davidson, Jon P</au><au>Duffield, Wendell A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM</atitle><jtitle>Journal of petrology</jtitle><date>1999-05-01</date><risdate>1999</risdate><volume>40</volume><issue>5</issue><spage>773</spage><pages>773-</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract><![CDATA[Isotopic fingerprinting of individual mineral phases, complemented by crystal size data, provides a unique avenue for elucidating the details of evolutionary histories of crustal magma systems. Here we report the first measurements of Sr isotopic compositions of single crystals as a function of size and Sr isotopic profiles constructed through microdrill sampling of sanidine crystals from a high-silica rhyolite lava from the Taylor Creek Rhyolite, NM. Whole-rock <87<Sr/<86<Sr increases monotonically with modal abundance of sanidine phenocrysts, suggesting Taylor Creek magma evolved through a coupled process of assimilation and crystallization. In contrast, sanidine phenocrysts do not show simple monotonic increases in <87<Sr/<86<Sr as a function of crystal size and core-to-rim stratigraphy. Instead, <87<Sr/<86<Sr ratios and Sr concentrations of individual sanidines increase with crystal size to a maximum at ~4 mm and then decrease with further increase in size. Microsampling of two crystals greater than 4 mm in length showed core-to-rim increase then decrease in <87<Sr/<86<Sr, whereas a single sanidine crystal less than 4 mm in length displayed a simple core-to-rim decrease in <87<Sr/<86<Sr. Furthermore, in contrast to measured size distributions of crystals in volcanic rocks, which commonly decrease exponentially with increasing size, crystal size frequency histograms are bell shaped, with decreasing numbers of crystals in the smallest size class. All these results are consistent with a model involving continuous phenocryst nucleation and growth in a crustally contaminated magma into which a lower-<87<Sr/<86<Sr, lower-Sr magma was injected. In such a scenario, it is argued that curved crystal size distributions mirror variations in nucleation rate in response to changes in undercooling as the magma body evolved from assimilation- to recharge-dominated regimes.]]></abstract><cop>Oxford</cop><pub>Oxford Publishing Limited (England)</pub><doi>10.1093/petrology/40.5.773</doi><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Oxford University Press Journals All Titles (1996-Current); EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection; Free Full-Text Journals in Chemistry |
| title | Evolution of Silicic Magma through Assimilation and Subsequent Recharge: Evidence from Sr Isotopes in Sanidine Phenocrysts, Taylor Creek Rhyolite, NM |
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