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陕西望江山岩体位于西乡县西北,是一个具有层状构造的基性侵入体,前人一般认为岩体中的韵律层状岩石是岩浆在岩浆房中就地结晶分异形成的。本次通过对侵入体的岩石、矿物特征的研究,认为韵律层状岩系是岩浆多次侵入活动形成的产物。母岩浆在深部岩浆房经结晶分异、液态扩散、硅酸盐液态不混熔等作用分异为成分有差异的衍生岩浆,这些岩浆分期次上涌,在侵位后岩浆除再经结晶分异等作用外,由于深部岩浆的多次上涌,因而有显著的岩浆混合作用发生。本文着重介绍岩浆多次活动及其混合作用。
The Wangjiang Mountain rock mass in Shaanxi Province is located in the northwest of Xixiang County. It is a basic intrusive body with a layered structure. Previously, it is generally believed that the rhythmic stratiform rock in the rock mass is formed by in-situ crystallization of magma in the magma chamber. By studying the characteristics of intrusive rocks and minerals, this paper argues that the rhyolite stratigraphic series are the products formed by multiple intrusions of magma. In the deep magma chamber, the parent magma differentiated into crystal-differentiated, liquid-dispersed and silicate liquid-immiscible magma derived derivative magmas with different composition. These magmas were upwelling in phases, Because of the different functions of the magma, a significant magma mixing effect occurs due to the multiple upwelling of the deep magma. This article focuses on multiple activities of magma and their mixing effects.