Kinetics and pulses of zircon growth in migmatites beneath a volcanic arc: An example from the high-T Ryoke Complex, southwest Japan

IF 3.5 2区 地球科学 Q1 GEOLOGY Journal of Metamorphic Geology Pub Date : 2023-01-20 DOI:10.1111/jmg.12711
Kazuhiro Miyazaki, Takeshi Ikeda, Hideki Iwano, Takafumi Hirata, Tohru Danhara
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引用次数: 1

Abstract

We present an analysis of kinetics and pulses of zircon growth in migmatites formed at middle to lower crustal depths beneath a volcanic arc. Migmatites in high-T metamorphic complexes at active continental margins, such as in the Ryoke Complex of southwest Japan, are thought to have been produced beneath volcanic arcs. Thermal models suggest that melt advection supplies the heat to form such high-T complexes. We found that zircons in the migmatites of the Ryoke Complex grew in multiple discrete stages by rapid diffusion-controlled growth. The individual growth pulses can be distinguished using a Gaussian mixture model when the duration of each growth pulse is shorter than 1σ of the analytical error of the zircon age dating, and where the interval between each growth pulse is larger than 2σ of them. This method allows extraction of the growth pulses even when the zircon exhibits incomplete textural evidence for multiple stages of growth. Application of the method to the Ryoke Complex revealed three and four pulses of zircon growth with 3–10 Myr intervals for two migmatite samples respectively in the Mikawa area and three pulses with 2–4 Myr intervals from one migmatite sample in the Yanai area. The detected zircon growth pulses are consistent with previously reported pulses of plutonic activity in the two areas, with the exception of the oldest growth pulse in the Mikawa area. Therefore, the growth pulses are interpreted to be the result of thermal pulses because of melt flux events at lower to middle crustal levels. The inferred intervals of pulsed melt fluxes are similar to those of individual caldera formation in coeval caldera clusters at the surface.

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火山弧下混合岩中锆石生长的动力学和脉冲:以日本西南部高T Ryoke杂岩为例
我们对火山弧下地壳中下部形成的混合岩中锆石生长的动力学和脉冲进行了分析。活跃大陆边缘的高T变质杂岩中的混合岩,如日本西南部的Ryoke杂岩,被认为是在火山弧下产生的。热模型表明,熔体平流提供了形成这种高T复合体的热量。我们发现,Ryoke杂岩混合岩中的锆石通过快速扩散控制生长,以多个离散阶段生长。当每个生长脉冲的持续时间小于锆石年龄测定分析误差的1σ,并且每个生长脉冲之间的间隔大于其中的2σ时,可以使用高斯混合模型来区分单个生长脉冲。即使锆石在多个生长阶段表现出不完整的结构证据,这种方法也可以提取生长脉冲。该方法在Ryoke杂岩中的应用表明,三川地区的两个混合岩样品分别有三个和四个锆石生长脉冲,间隔为3-10 Myr,而柳井地区的一个混合岩样本有三个锆石生长周期,间隔为2-4 Myr。检测到的锆石生长脉冲与之前报道的两个地区的深成活动脉冲一致,但三川地区最古老的生长脉冲除外。因此,生长脉冲被解释为热脉冲的结果,因为地壳中下层的熔体通量事件。推断出的脉冲熔体通量的间隔与表面同时代破火山口群中单个破火山口形成的间隔相似。
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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
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