摘要
磁化率各向异性(AMS)表征岩石及其组成矿物的低场磁化率在不同方向上的变化.AMS以其高精度、经济省时和无损测量等优点,广泛应用于地学各个领域.火成岩原生的磁组构可用于分析岩石结构,指示熔岩流、火山碎屑流、浅成侵入岩以及深成岩体的岩浆流动方向、侵位方式和岩浆来源,研究岩石在侵位期间经历的构造事件,从而进行火成岩同构造侵位过程的研究;而利用次生磁组构则可分析岩石在侵位期后经历的改造作用.AMS结合传统岩石学、构造学方法,能有效解决特定的地质问题.
The anisotropy of magnetic susceptibility(AMS)of rocks is controlled by preferentially oriented magnetic mineral grains and it contains information about both the grain susceptibilities and the grain orientations.As a rapid and sensitive petrofabric tool,AMS has important applications in petrofabrics, rock magnetism, volcanology, structural geology,metamorphism and tectonics.For igneous rocks,magnetic fabric analysis is a powerful approach for studying emplacement mechanisms and magma sources of effusive,hypabyssal,intrusive and pyroclastic rocks.In addition,it is effectively used to analyze the process of syntectonic emplacement or postintrusive deformation of igneous rocks.Because of the interpretation of AMS might remain ambiguous,it is reasonable to attempt an interpretation that takes other petrofabrics and regional trends into consideration.
出处
《地球物理学进展》
CSCD
北大核心
2014年第3期1023-1032,共10页
Progress in Geophysics
基金
浙江省自然科学基金项目(LY12D02002)资助