论文部分内容阅读
任务的提出和研究方法在近年的文献中,广泛讨论了地幔对花岗岩浆形成起决定性影响的问题.有一种观点日益明显,即在地幔中可能直接熔出大量酸性岩浆.本文作者分析了布里亚特外贝加尔地区古生代岩浆作用的资料以后,也得出结论:在花岗形成过程中,有相当大量的地幔流体和钾的加入.目前普遍运用地球化学,首先是同位素地球化学的方法,来获得有关花岗岩浆起源时地幔和地壳组分比例的信息.为解决这一问题,我们对同时代的基性岩浆岩和酸性岩浆岩系列化学成分演化的主要方向进行了对比分析.该方法的实质如下.
Tasks proposed and research methods In recent years, extensive discussion on the role of the mantle in granite magma formation has been extensively discussed, with the notable point being that the acid magma may be directly melted in the mantle, After the data of Paleozoic magmatism in the extraterritorial Baikal region, it is also concluded that there is a considerable amount of mantle fluid and potassium in the formation of granites, and geochemistry, first of all isotope geochemistry, is now commonly used To obtain information on the proportions of mantle and crust components in the granitic magmas origin, we have analyzed the main directions of the chemical composition evolution of the basic magmatic rocks and acidic magmatic rocks in contemporary times in order to solve this problem.The essence of this method as follows.