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长石作为中酸性岩的主要造岩矿物,对岩石鉴定定名以及成因演化的分析有重要意义。本文在野外调研和手标本观察的基础上,利用偏光显微镜、XRD技术、红外光谱技术对黄陵花岗岩中的长石进行分析,确定其长石的种类,分析其演化特征,从而探讨其对黄陵花岗岩成因和演化的意义。通过分析定名本文所用的黄陵花岗岩为英云闪长岩,其中的长石主要为钠长石,其次有少量的钙长石和微斜长石。依据岩石标本可判定出:黄陵花岗岩中的很多矿物(如长石)都已经绿泥石化、绿帘石化和方解石化;从物相分析,可以确定岩石在形成之后发生了强烈的蚀变和风化,其中的钙长石已经基本完全转变为葡萄石等含钙矿物,碱性长石转变为白云母、伊利石等矿物。
Feldspar, as the major rock-forming mineral in the medium-acidic rocks, is of great significance to the identification of rocks and their evolution. Based on the field investigation and hand specimen observation, the feldspar in Huangling granite was analyzed by polarized light microscopy, XRD and infrared spectroscopy to determine the type of feldspar and to analyze the evolutionary characteristics of feldspar. The Significance of Genesis and Evolution of Lingling Granite. The Huangling granites used in this paper are named as diorite by analysis. The feldspar is mainly albite, followed by a small amount of anorthite and plagioclase. Based on the rock specimens, many minerals (such as feldspar) in the Huangling granite have been identified as chlorite, epidotis and calcite. From the phase analysis, it can be determined that the rock has undergone strong alteration after formation Weathering, in which the calcium feldspar has basically completely transformed into gravel and other calcium minerals, alkaline feldspar into muscovite, illite and other minerals.