中文摘要：

西昆仑麻扎构造混杂岩带是1：25万《麻扎幅》区域地质调查过程中发现并厘定的。岩块主要由火山弧杂岩、与弧相关的沉积建造和外来岩块3部分15个块体组成。各块体之间均为断层接触。基质分布在岩块的边部，主要由构造片岩和糜棱岩等组成。它包含着古洋壳消减过程中的一些重要信息。对构造混杂岩内角闪石英闪长岩进行SHRIMP测年，结果为（338±10）Ma，为早石炭世。麻扎构造混杂带的发现和研究，不仅丰富了麻扎-康西瓦缝合带的内容，而且将该带的演化时限提前到早石炭世，为西昆仑造山带研究提供了基础资料。

英文摘要：

The Mazha tectonic melange was discovered and determined during the 1 ： 250,000-scale regional geological mapping in the Mazha region. The blocks are composed of the arc complex, arc-related sedimentary rocks and exotic blocks and can be classified as 15 blocks that contact with each other by faults. The matrix which lies around the blocks is composed of the tectonic schists and dynamometamorphic rocks. Many important information about the subduction processing of the old oceanic crust revealed through the detailed study of the Mazha tectonic melange. Zircon SHRIMP dating of the hornblende-quartz-diorite from the Mazha melange was carded out in this study. The results are （338 ±10）Ma in age, which shows that the hornblende-quartz-diorite is formed in Early Carboniferous. The discovery and study of the Mazha tectonic melange have not only enriched the contents of the Mazha-Kangxiwa suture zone , but also advanced the evolvement age of the suture zone to Early Carboniferous, and offered basic data for the study of West Kunlun orogenic belt.