Abstract

This paper reports the results of thermodynamic modeling of the formation of the Birkhin volcanoplutonic association by means of geochemical thermometry. The obtained liquid line of descent for the magma chamber of the Birkhin Massif indicates that the melt evolved into the field of subalkaline composition. The melts of the volcanics of the Tsagan-Zaba complex are identical to the melts in the magma chamber in both major components and REEs. It was concluded that the Birkhin and Tsagan-Zaba complexes are comagmatic. A scenario was proposed for the development of the Birkhin volcanoplutonic association involving multiple eruptions of volcanic rocks during its formation. It was shown that the intermediate rocks are not derivatives of basic magmas, but were produced by interaction of basic volcanic rocks with felsic intrusions cutting them.

中文翻译：

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贝加尔湖西部地区奥克洪地区Birkhin火山碳沉积协会：岩浆成因的岩石学标准

摘要

本文报道了通过地球化学测温法对Birkhin火山光合生代的形成进行热力学建模的结果。所获得的Birkhin地块岩浆室的下降液体线表明，熔体演化为亚碱性成分领域。Tsagan-Zaba复合体的火山熔体与岩浆室内主要成分和REE中的熔体相同。得出的结论是，Birkhin和Tsagan-Zaba配合物是磁性的。为Birkhin火山光生岩石联合体的发展提出了一个方案，该方案涉及火山岩形成过程中的多次喷发。结果表明，中层岩石不是基本岩浆的衍生物，而是由基本火山岩与长英质侵入作用共同作用产生的。