碱性岩研究进展述评

碱性岩的概念曾有三种观点,现多数学者倾向于用化学方法来综合判别碱性岩:碱性岩就是根据化学成分判别其碱性程度属于碱性的岩浆岩。碱性岩物质来源较深,主要源自上地幔,形成于岩石圈拉张环境,是深部地球动力学过程在浅部地壳的直接表现和历史记录,因此对其研究是探索地球深部物质组成、物理化学环境、地壳上层构造和深部动力学过程的一个重要途径,碱性岩是除幔源岩石包体外另一类可提供地幔信息的岩石,是窥探地幔的窗口。20世纪后期以来,对这一类型岩石的研究越来越受到地球科学家们的重视,形成了新的研究热点。

STUDY PROGRESS OF THE ALKALINE ROCKS :A REVIEW

The concept of the alkaline rocks once contain three kinds of viewpoints, now most scholars incline toward to synthesize to distinguish the alkaline rocks with chemical methods: alkaline rocks are those igneous rocks whose alkalinity belong to alkaline and peralkaline by chemical composition, In general, the origin of alkaline rocks is in the deep part of the Earth, they primarily derive from the upper mantle and form in the extension environment . Alkaline rocks,which present in the Earth's shallow parts,have recorded a lot of information of the deep parts of the Earth .For example, the physical-chemical environment, the material composition,the dynamics process and the upper level structure of the Earth'crust ,etc.. Therefore research on the alkaline rocks is an important approach to peer into the deep parts of the Earth. The alkaline rocks are another kinds of rocks besides the mantle enclaves that can offer mantle information,they are windows on the earth's interior. In the 20th century more and more petrologists have been paying much attention to study the alkaline rocks.This has been forming a new research heat.