Plagioclase varieties from leucogranites of the Raumid pluton (Pamirs) were studied by isotope Rb–Sr method. The studied varieties are: (1) fresh, crystal-clear magmatic oligoclase and (2) altered by deuteric saussuritization, turbid plagioclase. Comparison of data obtained for the coexisting varieties shows that saussuritization of the leucogranites led to Rb and Sr content and 87Rb/86Sr growth, and (87Sr/86Sr)0 distortion. This imply gain of alkaline and alkaline earth elements during saussuritization. The case of the Raumid pluton suggests a possibility of the gain from country rocks.

中文翻译：

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花岗岩中 Rb-Sr 同位素系统的特性：来自 Raumid Pluton Leucogranites (Pamirs) 的新鲜和改变斜长石品种的比较研究结果

通过同位素 Rb-Sr 方法研究了来自 Raumid 岩体（帕米尔高原）的无色花岗岩的斜长石品种。研究的品种有：（1）新鲜的、晶莹剔透的岩浆寡长石；（2）经氘化、混浊的斜长石改造。对共存品种获得的数据进行比较表明，白花岗石的火龙骨化导致了 Rb 和 Sr 含量和 87Rb/86Sr 的增长，以及 (87Sr/86Sr)0 畸变。这意味着在 sussuritization 过程中碱和碱土元素的增加。Raumid 岩体的情况表明可能从乡村岩石中获益。