Alkali Exchange during Devitrification and Hydration of Glasses in Ignimbrite Cooling Units
Alkali Exchange during Devitrification and Hydration of Glasses in Ignimbrite Cooling Units
复制标题
熔凝结冷却装置中玻璃失透和水合过程中的碱交换
DOI：
10.1086/627591
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
R. B. Scott
中科院分区：
文献类型：
--
作者：
R. B. Scott
碱离子交换岩石和水相在失透和二次水化的熔结凝灰岩片有助于显着观察到的化学变化，在密集的焊接玻璃质和失透凝灰岩。可能大部分碱离子交换发生在冷却期间，因为离子交换影响缓慢冷却的厚（>300英尺）单元的内部，而快速冷却的薄（<100英尺）单元在其内部没有碱交换的证据。通过地下水的沥滤去除冷却装置部分或非焊接边缘的碱。不同的地层中断碱的趋势表明，个人喷发脉冲的灰流材料，现在焊接成一个冷却单元，有独特的碱比有关的岩浆的不均匀性。
Alkali-ion exchange between rock and aqueous phases during devitrification and secondary hydration of ignimbrite sheets contributes significantly to observed chemical variations in densely welded glassy and devitrified tuffs. Probably most of the alkali-ion exchange occurs during the cooling period because ion exchange affects interiors of slowly cooling thick (>300 foot) units, whereas rapidly cooling thin (<100 foot) units show no evidence of alkali exchange in their interiors. Leaching by groundwater removes alkalis from partially or nonwelded margins of cooling units. Distinct stratigraphic breaks in trends of alkalis indicate that individual eruptive pulses of ash-flow material, now welded into one cooling unit, had distinctive alkali ratios related to magmatic inhomogeneities.