Natroalunite on Ruapehu volcano, New Zealand
Natroalunite on Ruapehu volcano, New Zealand
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新西兰鲁阿佩胡火山上的钠明矾石
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
B. W. Robinson
中科院分区：
文献类型：
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作者：
I. Graham;B. W. Robinson
最近在新西兰陶波火山带鲁阿佩胡山北方斜坡发现了一个直径5厘米的结核，由叶片状钠明矾石、石英和金红石组成。钠明矾石晶体呈带状，具有富钾核和富钠边，并富集Ba和Sr超过Rb。锶同位素组成（0.70535）接近鲁阿佩胡火山熔岩的平均值，5345（%o）CDT值为+16.1，与鲁阿佩胡火山口湖中溶解的硫酸盐相似。结核可能起源于低pH值热液的沉淀物，随后被热熔岩烘烤。
A 5 cm diameter nodule recently recovered from the northern slopes of Mount Ruapehu, Taupo Volcanic Zone, New Zealand consists of bladed natroalunite, quartz and rutile. The natroalunite crystals are zoned, having K-rich cores and Na-rich rims, and are enriched in Ba and Sr over Rb. The strontium isotopic composition (0.70535) is close to the average for Ruapehu lavas and the 5345 (%o) CDT value of + 16.1 is similar to dissolved sulphate in Ruapehu crater lake. The nodule probably originated as a precipi tate from hydrothermal fluids at low pH, and was subsequently baked by hot lava.