青海都兰地区控矿构造特征研究

A STUDY OF STRUCTURAL CONTROL OF ORES IN THE DULAN AREA,QINGHAI

本文应用地质力学的理论和方法,划分了青海都兰地区构造体系,讨论了其成生发展和演化历史。指出区域东西向构造、南北向构造和西域系是成矿前构造体系。本区主要的控矿构造体系是青藏歹字型(头部外围褶带)和河西系,并确定了主要控矿构造型式。文中还讨论了构造体系对区内沉积建造、岩浆建造,矿产分布规律的多级控制作用和构造体系复合的控矿作用。

A study of the formation and evolution of the tectonic systems present in the area and their relation to mineralization shows that the E-W-and N-S-trending structures and the West China system are pre-mineralization tectonic systems,and that anterior peripheral fold- belt of the Qinghai-Tibetan eta-type structure and the Hexi system are the main ore-control- ling tectonic systems.In addition,a discussion is also made on the tectonic system control of sedimentary formation and magmatism,and on the control of ore by different orders of struc- tures of a tectonic system as well as by their compounding.