PARTITIONING OF SR, BA, RB, Y, AND LREE BETWEEN PLAGIOCLASE AND PERALUMINOUS SILICIC MAGMA
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dc.contributor.author | Ren M. | |
dc.contributor.author | Parker D.F. | |
dc.contributor.author | White J.C. | |
dc.date.accessioned | 2022-01-02T07:44:03Z | |
dc.date.available | 2022-01-02T07:44:03Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=7593662 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 7, 1091 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/34075 | |
dc.description.abstract | Trace-element partition coefficients between plagioclase and coexisting glass/matrix have been determined for twenty-nine rhyodacite-rhyolite samples from nine volcanic centers. Strontium par-tition coefficients form two clear positive trends when plotted against the An content of plagioclase. One trend has a steep slope with DSr between 5.6 and 15.8 (T1), whereas the other trend has a gentle slope with DSr between 1.2 and 7.6 (T2). Barium partition coefficients show similar patterns: a steeply sloped trend is formed by samples with DBa between 1.6 and 8.8, and a gently sloped trend by samples with DBa <1. DSr and DBa in plagioclase correlate positively, and both DSr and DBa correlate positively with temperature. Samples with large DSr and DBa are all from rocks with <1 wt% CaO. These rocks are peraluminous and also have low total Sr and Ba. Partition coefficients for Sr and Ba are influenced by whole-rock CaO in high-Al rhyolite systems. Where these systems have low CaO, the opportunity increases for other divalent cations to enter the plagioclase structure. Strontium and Ba will then enter the M position of plagioclase to balance the charge deficiency caused by the substitution of Al for Si. Because of the potent influence of whole-rock composition on Sr and Ba partitioning for low CaO rocks, values of partition coefficients in petrogenetic modeling needs to be selected carefully. | |
dc.subject | MINERALOGY | |
dc.subject | SILICON | |
dc.subject | LAVA | |
dc.subject | plagioclase | |
dc.title | PARTITIONING OF SR, BA, RB, Y, AND LREE BETWEEN PLAGIOCLASE AND PERALUMINOUS SILICIC MAGMA | |
dc.type | Статья |
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