摘要
天山造山带具有长期的演化历程与复杂的构造物质组成,长期以来,新疆地质界对塔里木板块与准噶尔板块的拼合界线,一般置于夹持在是康古尔塔格断裂带和阿齐克库都克断裂带之间的觉罗塔格晚古生代沟弧带。笔者在参加1∶5万苦水地区区域地质调查工作中,发现苦水构造带是由陆架边缘楔、岛弧玄武岩块、远洋硅质岩块和混杂砾岩楔等组成的构造混杂岩带;在其北部黄山一带原划下石炭统干墩组浅变质地层中解体出一套富铝中深变质岩系。苦水构造混杂岩带的厘定和黄山变质地体的发现,为重新认识东天山造山带的构造物质组成、大地构造格局与发展演化提供了新的依据。
The Tianshan orogenic belt is featured in its long history of evolution and complicated structures. The contact boundary between the Tarim plate and the Zhunger plate has been considered to be the Jueluotag arc-trench zone of the Late Paleozoic time in between the Kanggurtag fault zone and the Aqikekuduke fault zone for a long time. During regional geo-ogical surveying at a scale of 1 ： 50,000 in Kushui area, it is discovered that the Kushui tectonic belt is a tectonic mélange zone that consists of marginal wedge of continental shelf, island-arc basalt mass, pelagic siliceous blocks and mélange wedges, and a system of rich-in-aluminum and moderate to high metamorphosed rocks disintegrated from the epimetamorphic rocks of the original Lower Carboniferous Gandun Formation in the north of Huangshan area. The determination of the Kushui tectonic mélange and the discovery of the Huangshan metamorphosed masses provide some new evidences for reconsideration of the tectonic materials, tectonic framework and evolution in the Tianshan orogenic zone.
出处
《陕西地质》
2009年第1期43-55,共13页
Geology of Shaanxi
关键词
哈密地区
天山造山带
苦水构造混杂岩带
地质特征
Hami area
Tianshan orogenic zone
Kushui tectonic mélange zone
geological features
