Melting and melt segregation in the aureole of the Glenmore Plug, Ardnamurchan
Melting and melt segregation in the aureole of the Glenmore Plug, Ardnamurchan
复制标题
阿德纳默亨格伦莫尔插头光环中的熔化和熔化偏析
DOI：
10.1111/j.1525-1314.2005.00560.x
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发表时间：
2005
影响因子：
3.4
通讯作者：
M. Caddick
中科院分区：
文献类型：
--
作者：
M. Holness;K. Dane;R. Sides;Christopher Richardson;M. Caddick
Ardnamurchan 的 Glenmore 栓塞（一个活跃了 1 个月的岩浆通道）引起的接触变质作用导致部分熔化，熔化物现在以玻璃形式保存。大部分光环的原始性质为研究熔体分布提供了一个天然实验室。一个简单的热模型，基于石英-长石晶界上熔体的首次出现、鳞石英后石英副晶的首次出现以及合理的岩浆侵入温度，提供了熔化的时间尺度。石英-长石晶界上的熔化最初很快，熔体边缘厚度几乎恒定地以平均速率 0.5–1.0 × 10−9 cm s−1 进一步增加。该速率很可能是由晶界和熔体边缘上有限量的 H2O 分布控制的。
Contact metamorphism caused by the Glenmore plug in Ardnamurchan, a magma conduit active for 1 month, resulted in partial melting, with melt now preserved as glass. The pristine nature of much of the aureole provides a natural laboratory in which to investigate the distribution of melt. A simple thermal model, based on the first appearance of melt on quartz–feldspar grain boundaries, the first appearance of quartz paramorphs after tridymite and a plausible magma intrusion temperature, provides a time‐scale for melting. The onset of melting on quartz–feldspar grain boundaries was initially rapid, with an almost constant further increase in melt rim thickness at an average rate of 0.5–1.0 × 10−9 cm s−1. This rate was most probably controlled by the distribution of limited amounts of H2O on the grain boundaries and in the melt rims.