东天山晚古生代-中生代构造演化和内生金属矿床成矿系列

本文立足于东天山地区晚古生代-中生代内生金属矿床的野外地质研究,在充分整理和消化前人大量研究成果的基础之上,选取典型矿床进行重点解剖研究,尝试应用成矿系列的理论来认识东天山晚古生代-中生代内生金属矿床的时空分布和成矿动力学演化规律,以内生金属矿床时空分布样式作为大地构造环境的标志和限定;本文主要以东天山地区的内生金属矿床为研究对象,并按照成矿系列的学术思想,将其进一步划分为5个成矿亚系列。按照时代顺序,对于每一个成矿系列形成的成矿动力学背景、时空分布规律、典型矿床特征和成因机制进行了简要论述;基于对成矿系列的分析研究,进而探讨了东天山晚古生代-中生代内生金属矿床规律与构造演化之间的关系;总结了该地区古生代俯冲-增生和中生代后碰撞演化导致了该地区独居特色的内生金属矿床侧向分带现象;指出东天山作为中亚增生造山带的重要组成部分,古生代-中生代的构造经历了完整的俯冲-增生、碰撞造山和后碰撞的演化阶段,而每一个构造演化阶段都伴随有一套内生金属矿床成矿系列和金属元素的大量堆积。

Late Palaeozoic-Mesozoic endogenetic metallogenic series and geodynamic evolution in the East Tianshan Mountains

Based on field geology study on Late Paleozoic-Mesozoic metallogenic deposits in East Tianshan Mountains and the results of previous studies, this paper is try to reveal the spatial-time distributions of the typical Late Paleozoic-Mesozoic endogenous metal deposits in East Tianshan and their metallogenic dynamic evolutions under the theory of metallogenic series. The spatial and temporal distribution patterns of the metallogenic deposits are the signs and limitations of the geotectonic environment. In this paper, the endogenous metallogenic deposits in the East Tianshan area are the research objects, which are further divided into five metallogenic subseries according to the academic thought of metallogenic series. According to the order of time, this paper briefly discusses the metallogenic dynamic backgrounds, space-time distribution law, typical deposit characteristics and genetic mechanism of each metallogenic series. Based on the analysis and research of metallogenic series, the relationship between the rule of Mesozoic metallogenic deposit and tectonic evolution in the Late Paleozoic of East Tianshan is discussed. The subduction-accretion and post-Mesozoic collision evolution resulted in the lateral zoning of the endogenous metallic deposits in the region is summarized. It can be concluded that the East Tianshan Mountain is an important part of hyperplasia of Central Asian orogenic belt, which experienced structural evolution stages of complete subduction-accretion, collision and post-collision during Paleozoic and Mesozoic evolutionary, and in each stage accompanied with a set of endogenous metal metallogenic series of ore deposits and substantial accumulation of metal elements.