通过对西淋岗岩体出露的红层及其下部的含红层碎屑花岗岩和正常花岗岩进行X荧光光谱、 等离子质谱及拉曼光谱测试, 结果显示: (1)由红层、 含红层碎屑花岗岩至正常花岗岩, 硅、 碱含量逐渐增加, 灼失量、 铁镁含量、 氧化指数依次降低; (2)三者的微量元素蜘蛛网图及稀土元素标准化曲线一致性良好, 花岗岩富集和亏损特征类似于南岭改造型花岗岩; (3)西淋岗花岗岩中石英晶体从里到外拉曼光谱特征峰强度依次减弱, 半高宽变化不大。 据此我们认为, 西淋岗花岗岩的形成与红层及其下伏岩石原地熔融固结有关, 在熔融过程中, 原岩中挥发份不断逸出, 氧化指数逐渐降低; 在成岩过程中, 硅碱组分向岩体上部富集, 铁镁组分向下运移, 结晶环境对封闭和稳定。

The results on Xilingang pluton, mainly consisting of red beds, granites containing numerous debris of red beds and granites, obtained by X-ray fluorescence spectroscopy, plasma mass spectrometry and Raman spectroscopy show: (1) Xilingang pluton from red beds, granites containing numerous debris of red beds to granites has obvious characteristics of decreasing silicon and alkali content, and rising ignition loss, dark mineral content and oxidation index; (2) Chondrite-normalized REE distribution curves and primitive mantle-normalized spider diagram for trace elements of redbed, granites containing numerous debris of red beds and granites have a good consistency, the distribution characteristics of elements are similar to Nanling transformation-type granite; (3) The value of Raman spectrogram characteristic peak of quartz crystal in Xilingang granite decreased from the center of quartz crystal, and FWHM is steady. According to the above, the authors believe that Xilingang granite formed was related to in-situ melting of red beds and underlying strata and magma consolidation. Volatile components were discharged continuously, and oxidation index decreased gradually in the melting process. In the process of diagenesis, the top of pluton tend to be an ongoing silicon and alkali increase, while TFeO and MgO continue to migrate to bottom, and crystallization environment is a relatively closed and steady system.