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前言研究岩浆房中喷出的物质(如固结花岗岩体)是了解高位岩浆房内分异过程的一种途径。火山灰流凝灰岩是迅速淬火的岩浆房物质,通过它们我们就有可能了解酸性岩浆房上部岩浆在喷出前的化学及梯度特征(Hildreth 等,1980)。喷发单元层序在时空上正好与岩浆房相反,所以,对火山灰流凝灰岩的进一步研究,就可以了解酸性岩浆房上部岩浆随时间的化学演化。为了确定墨西哥哈利斯科瓜达拉哈拉(Guadalajara,Jalisco)西郊普里马韦拉(Primavera)山脉火山岩的喷发历史,编制了一幅1/2.5万地质图。根据地层关系及喷发时
Preface Studying materials emanating from the magma chamber, such as consolidated granite bodies, is one way to understand the differential processes in the upper magma chamber. Pozzolanic tuffs are rapidly quenching magmatic chambers that allow us to understand the chemical and gradient characteristics of the magma in the upper part of the acidic magma chamber prior to shooting (Hildreth et al., 1980). The sequence of the eruption units is just opposite to the magma chamber in time and space. Therefore, further study of the volcanic ash tuff can reveal the chemical evolution of the magma in the upper part of the acid magma chamber over time. In order to determine the eruption history of the volcanic rocks of the Primavera range in the western suburb of Guadalajara, Jalisco, Mexico, a 1 / 25,000 geologic map was prepared. According to the formation and eruption time