Insights from quartz cathodoluminescence zoning into crystallization of the Vinalhaven granite, coastal Maine
Insights from quartz cathodoluminescence zoning into crystallization of the Vinalhaven granite, coastal Maine
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DOI：
10.1007/s00410-007-0202-z
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发表时间：
2007-04
影响因子：
3.5
通讯作者：
R. Wiebe;D. A. Wark;D. Hawkins
中科院分区：
文献类型：
--
作者：
R. Wiebe;D. A. Wark;D. Hawkins
Vinalaven侵入杂岩为镁铁质和硅质岩浆的多次补充、花岗岩的混合和有限混合以及花岗岩的再生提供了野外和岩石学证据。花岗岩中的石英以阴极发光(CL)分带的形式保存了这些过程的记录，这与钛的浓度和使用新的钛(石英中的钛)地质温度计的结晶温度有关。将镁铁质熔体注入部分结晶的Vinalaven花岗岩中，导致部分石英重新吸收，随后H2O不饱和熔体产生更高的温度增长。这表现在CL强度和钛含量跨越不协调边界的陡峭边缘增加，这些边界截断了较老的增长区。受镁铁质岩浆影响的花岗岩中的石英分带表现出较大的边缘跳跃，而远离镁铁质岩石的花岗岩和花岗岩中的石英通常表现出宽阔的边缘，钛含量降低，与缓慢冷却一致，没有镁铁质补给造成的热中断。
The Vinalhaven intrusive complex provides field and petrographic evidence for multiple replenishments of mafic and silicic magmas, mingling and limited mixing, and rejuvenation of granite. Quartz in granitic rocks preserves a record of those processes, in the form of cathodoluminescence (CL) zoning, which is related to concentration of titanium, and to temperature of crystallization using the new TitaniQ (Ti in quartz) geothermometer. Injection of mafic melts into partly crystalline Vinalhaven granite resulted in partial quartz resorption followed by higher-temperature growth from H2O-undersaturated melt. This is shown by steep, rimward increases in CL intensity and Ti content across discordant boundaries that truncate older growth zones. Quartz zoning in granite affected by mafic magmas displays large rimward jumps in Ti content, whereas quartz in granitic feeders and in granite far from mafic rocks typically displays broad rims with decreasing Ti contents, consistent with slow cooling without thermal disruptions due to mafic recharge.