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本地段大部分岩石为片麻岩和火成花岗岩,岩浆及其热液使有些变质岩改造,所看到的变质岩应归因于同构造的渐进变质作用。证据有:典型的花岗鳞片变晶结构,高度发育的片麻构造,常见的矿物共生组合,Bi—Pl—Kf—Qz,此外,区域性的各斜长石An牌号的连贯关系,仅仅局部性的与绿帘石密切共生的那些少量斜长石的An牌号的有规则变动,显示了,变质平衡在总体上的完成。再则,三叉连接结构伴着出溶的钠长石边,反映出变质后的退火作用的存在。花岗岩具有种种主要的足以说明岩浆成因的特征。其中,明显的贯入行为以及表明岩浆逐步冷却作用的各不同斜长石依An牌号大小次序先后结晶,是很重要的。作者发现:在这些岩浆的和变质的钾长石中,双晶形成过程相似,双晶图案有异,光轴角的数据各具特色。据此,作者探索一种方法,无需使用X光衍射方法,有效地鉴别和研究不同成因的钾长石。这里出现不少混合岩化片麻岩。从科学严格性来衡量,所见到的几乎都够不上称混合岩。
Most of the rocks in this segment are gneiss and volcanic granites, and some magmatic rocks are remodeled by magma and its hydrothermal fluids. The metamorphic rocks seen are attributed to the progressive metamorphism of the same structure. The evidence includes the typical granodiorite transgranular structure, the highly developed flax structure, the common mineral assemblage, Bi-Pl-Kf-Qz, and the regional coherence of the An grades of plagioclase, The regular variation of the An grades of small plagioclase feldspar, which is closely associated with epidote, shows that the metamorphic balance is generally completed. Furthermore, the trifurcated structure accompanied by the dissolution of albite edge, reflecting the existence of the degenerate annealing. Granite has all the major features that explain the origin of the magma. Among them, the obvious penetrating behavior and the different plagioclase demonstrating the gradual cooling of the magma are crystallized according to the order of size and size. It is very important. The authors found that in these magmatic and metamorphic potash feldspar, twinning processes are similar, twin patterns are different, and optical axis angle data are unique. Accordingly, the authors explore a method that can effectively discriminate and study K-feldspar from different causes without using X-ray diffraction methods. There are many mixed rock gneiss here. Measured in terms of scientific rigor, almost none of the things we see are called mixed rocks.