跨地壳岩浆系统的塑性:新西兰陶波火山区南部斜长石微晶中超高分辨锰-畸变的证据

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Daniel A Coulthard Jr, Raimundo Brahm, Charline Lormand, Georg F Zellmer, Naoya Sakamoto, Yoshiyuki Iizuka, Hisayoshi Yurimoto
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引用次数: 0

摘要

抗晶矿物的驻留时间尺度是有关跨地壳岩浆系统岩石学演化的关键信息,可通过结合微分析化学和扩散建模得出的观测结果进行推断。在此,我们展示了新西兰南部陶波火山区汤加里罗火山中心的堆叠式 CMOS 型有源像素传感器(SCAPS)等位面图像。这些晶体以亚微米级的空间分辨率显示出高频率的钙钛矿和阳起石分带。我们还发现,所有晶体都显示出高频率的晶体内锶化学势变化,这表明它们在岩浆温度下的停留时间还不足以使扩散弛豫显著提前。为了量化晶体在这些恒温恒定的岩浆温度下的停留时间,我们首先使用数值方法对晶体内硒的扩散随时间的变化进行了前向模拟。然后,利用新开发的空间傅立叶变换技术对结果进行分析,以了解空间频率域中硒不平衡扩散衰减的系统性。这最终允许对晶体形成时的硒浓度分布进行估计,然后再在喷发开始时吸收到载体熔体中。我们的数据表明,所研究的微抗晶体的停留时间为数天至数周。这与岩浆淤泥在高温下的长驻留时间不符,而是表明陶波火山区南部下方的岩浆管道系统具有冷成岩的性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Plutonic nature of a transcrustal magmatic system: evidence from ultrahigh resolution Sr-disequilibria in plagioclase microantecrysts from the southern Taupo Volcanic Zone, New Zealand
The residence timescales of antecrystic minerals contribute a key piece of information regarding the petrologic evolution of transcrustal magmatic systems and may be inferred using a combination of observations derived from microanalytical chemistry and diffusion modelling. Here, we present state-of-the-art stacked CMOS-type active pixel sensor (SCAPS) isotopographic images of tephra-hosted plagioclase microantecrysts from Tongariro Volcanic Centre in the southern Taupo Volcanic Zone, New Zealand. These crystals exhibit high-frequency Sr and anorthite zonation at sub-micron spatial resolution. We also find that all crystals display high-frequency intracrystalline Sr chemical potential variations, indicating that they have not resided at magmatic temperature for diffusive relaxation to advance significantly. To quantify crystal residence times at the well-constrained magmatic temperatures of these tephras, we first forward-modeled intracrystalline Sr diffusion over time using numerical methods. Results were then analyzed using novel spatial Fourier-transform techniques developed to understand the systematics the diffusive decay of Sr disequilibria in the spatial frequency domain. This ultimately permitted the estimation of Sr concentration profiles at crystal formation, prior to uptake into the carrier melt at the onset of eruption. Our data imply residence times of days to weeks for the studied microantecrysts. This is inconsistent with long antecryst residence times in magmatic mushes at elevated temperatures, pointing instead to a cool plutonic nature of the magmatic plumbing system beneath the southern Taupo Volcanic Zone.
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来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
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