The Diebusige Complex, the highest-grade metamorphic complex in the Alxa Block, can provide significant insights into the origin, formation, evolution, and tectonic affinity of the Alxa Block. Petrographic observations show that the mineral assemblage of (garnet) magnetite quartzite from the Diebusige Complex is magnetite + quartz + hypersthene + plagioclase ± clinopyroxene ± garnet. The metamorphic temperature (T) is constrained to 800–860 °C by the two-pyroxene geothermometer, corresponding to granulite-facies metamorphism. Geochronological studies involving cathodoluminescence (CL) images, LA-ICP-MS U-Pb dating, and trace element analyses of zircons show that the time of granulite-facies metamorphism was approximately 1850 Ma. Combined with the corresponding published data, this paper suggests that the metamorphic basement rocks of the Alxa Block record Neoarchaean-early Palaeoproterozoic magmatic-metamorphic and late Palaeoproterozoic granulite-facies metamorphic events, thereby indicating the affinity between the Alxa Block and the Khondalite Belt (KB).

Diebusige复合体是Alxa区块中最高品位的变质复合体，可以提供有关Alxa区块的起源，形成，演化和构造亲和力的重要见解。岩相学观察表明，来自迪布西格复合体的（石榴石）磁铁矿石英岩的矿物组合为磁铁矿+石英+硫亚砜+斜长石±斜py石±石榴石。变质温度（T）被2 py地热仪限制在800–860°C，与花岗石相变质作用相对应。涉及阴极发光（CL）图像，LA-ICP-MS U-Pb定年以及锆石的痕量元素分析的地质年代研究表明，花岗石相变质的时间约为1850 Ma。结合相应的已发表数据，本文认为Alxa块体的变质基底岩石记录了新古生代-早古元古代的岩浆-变质和晚古元古代的花岗质相的变质事件，从而表明了Alxa块体与Khondalite带（KB）之间的亲和力。 ）。