Measuring Timescales of Magmatic Evolution
Measuring Timescales of Magmatic Evolution
复制标题
测量岩浆演化的时间尺度
DOI：
10.2113/gselements.3.4.267
复制
发表时间：
2007
期刊：
影响因子：
4.5
通讯作者：
F. Costa
中科院分区：
文献类型：
--
作者：
S. Turner;F. Costa
分析方法的进步为岩浆作用的时间尺度提供了新的见解。块状岩石和晶体分离物中铀系列同位素丰度的数据表明，岩浆在数千年内发生了分异。基于单晶原位年龄数据的硅质岩浆的驻留和分异时间从10,000到100,000年不等，有大量证据表明以前侵入事件的晶体循环。单晶中的化学分带模式表明，岩浆的混合和混合以及地壳同化等过程可能在几个月到几十年的短得多的时间尺度上发生。量化岩浆产生、侵位和分异的速度限制了所涉及的过程，并可能有助于评估火山灾害。
Advances in analytical methods have provided new insights into the timescales of magmatic processes. Data on the abundances of U-series isotopes in bulk rocks and crystal separates indicate magma differentiation over thousands of years. Residence and differentiation times of silicic magmas based on single-crystal, in situ age data vary from 10,000 to 100,000 years, with abundant evidence for crystal recycling from previous intrusive episodes. Chemical zoning patterns in single crystals indicate that processes such as mixing and mingling of magmas and crustal assimilation may occur over much shorter timescales of months to decades. Quantifying the rates of magma generation, emplacement and differentiation constrains the processes involved and may contribute to the evaluation of volcanic hazards.