| DOI: | 10.1002/2015GL067288
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| 论文题名: | Crystallization kinetics of rhyolitic melts using oxygen isotope ratios |
| 作者: | Befus K.S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9469
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| EISSN: | 1944-9200
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| 出版年: | 2016
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| 卷: | 43, 期:2 | | 起始页码: | 592
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| 结束页码: | 599
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| 语种: | 英语
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| 英文关键词: | crystal growth
; crystal nucleation
; kinetics
; oxygen isotope
; rhyolite
; spherulites
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| Scopus关键词: | Crystal growth
; Enzyme kinetics
; Feldspar
; Growth kinetics
; Isotopes
; Kinetics
; Oxygen
; Quartz
; Crystal nucleation
; Crystallization temperature
; Oxygen isotope composition
; Oxygen isotope ratios
; Oxygen isotopes
; Rhyolite
; Spherulites
; Temperature intervals
; Crystallization kinetics
; alkali feldspar
; crystallization
; in situ measurement
; nucleation
; oxygen isotope ratio
; quartz
; rhyolite
; spherulite
; temperature effect
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| 英文摘要: | Crystals provide the means to understand igneous systems, but natural constraints on crystallization kinetics are rare because thermal conditions and crystallization timescales are typically unknown. Oxygen isotope ratios in quartz and alkali feldspar crystals in spherulites provide a natural record of the temperature interval of crystallization and crystal growth rates in rhyolitic melts. Oxygen isotope compositions in both phases change progressively with position from the spherulite core to rim. Quartz δ18O increases from 5.0 ± 0.3‰ in the core to 5.6 ± 0.3‰ at the rims, whereas alkali feldspar decreases from 3.7 ± 0.4‰ in the core to 2.7 ± 0.9‰ at the rims. Fractionation therefore increases from 1.3 ± 0.7‰ in the cores to 2.9 ± 1.1‰ at the rims. Oxygen isotope thermometry tracks crystallization temperature with position. Spherulites nucleate at 578 ± 160°C and continue to grow until 301 ± 88°C. The in situ analyses demonstrate that spherulites self-contain a record of their thermal history and that of the host lava. © 2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84955481216&doi=10.1002%2f2015GL067288&partnerID=40&md5=1ac92c2d33a47090f47d935d806c4c20
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/10432
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Geology, Baylor University, Waco, TX, United States
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| Recommended Citation: | |
Befus K.S.. Crystallization kinetics of rhyolitic melts using oxygen isotope ratios[J]. Geophysical Research Letters,2016-01-01,43(2).
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