西昆仑麻扎构造混杂岩的组成及其地质意义

现代地质 ›› 2007, Vol. 21 ›› Issue (1): 78-86.

西昆仑麻扎构造混杂岩的组成及其地质意义

李博秦^1,2，计文化³，边小卫²，王峰²，李伟⁴

1中国地质科学院地质研究所，北京100037；2 陕西省地质调查院，陕西咸阳712000；
3 中国地质调查局西安地质矿产研究所，陕西西安710054；4 中国地质科学院地质力学研究所，北京100081

收稿日期:2006-10-19 修回日期:2006-12-03 出版日期:2007-01-20 发布日期:2007-01-20
作者简介:李博秦，男，高级工程师，博士研究生， 1966年出生，地层古生物专业，从事区域地质调查工作。 Email:LBQ663@126.com。
基金资助:
中国地质调查局“1∶25万麻扎幅区域地质调查”项目(200213000005）；国家自然科学基金项目(40572018）;中国地质调查局项目(1212010611702);中—巴合作西构造结及邻区有关矿产和环境灾害地质背景的研究(1212010661312)

The Composition and Geological Significance of the Mazha Tectonic Melange in West Kunlun Mountains

LI Bo-qin^1,2，JI Wen-hua³,BIAN Xiao-wei²,WANG Feng²,LI Wei⁴

1Institute of Geology，Chinese Academy of Geological Sciences， Beijing100037， China;2Shaanxi Institute of Geological Survey， Xianyang，
Shaanxi712000，China;3 Xi′an Institute of Geology and Mineral Resources，Chinese Geological Survey，Xi′an， Shaanxi710054， China;
4 Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing100081，China

Received:2006-10-19 Revised:2006-12-03 Online:2007-01-20 Published:2007-01-20

摘要/Abstract

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。

关键词: 西昆仑麻扎, 构造混杂岩, 锆石SHRIMP U-Pb测年, 早石炭世

Abstract:

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 carried 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.

Key words: Mazha of West Kunlun mountains, tectonic melange, zircon SHRIMP U-Pb dating, Early Carboniferous

中图分类号:

李博秦，计文化，边小卫，王峰，李伟. 西昆仑麻扎构造混杂岩的组成及其地质意义[J]. 现代地质, 2007, 21(1): 78-86.

LI Bo-qin，JI Wen-hua,BIAN Xiao-wei,WANG Feng,LI Wei. The Composition and Geological Significance of the Mazha Tectonic Melange in West Kunlun Mountains[J]. Geoscience, 2007, 21(1): 78-86.

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