Volcanic Rocks Assemblage and Eruption Sequence of Dahalajunshan Formation in Wusunshan Region, Western Tianshan
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摘要: 新疆西天山地区伊犁地块南北缘以及地块内部广泛分布着大哈拉军山组火山岩系。笔者在前人研究基础上，以乌孙山一带出露的大哈拉军山组火山岩为主要研究对象，通过路线地质调查、剖面测制和岩相学等方面的系统研究，厘定了大哈拉军山组的岩石组合、地层序列及其变化规律。大哈拉军山组火山岩总体由玄武岩、安山岩、英安岩、流纹岩，以及中酸性火山碎屑岩组成。乌孙山-塔斯巴山地区以安山岩为主，占50%，玄武岩、英安岩和流纹岩比例相近。火山岩地层喷发序列上，乌孙山-塔斯巴山一带底部为中酸性火山岩，向上为中基性与中酸性火山岩的交替喷发，可划分出5~7个喷发旋回，火山活动整体上具有裂隙式-中心式喷发的特征。Abstract: The volcanic rocks of Dahalajunshan Formation are widespread in the Western Tianshan Mountain, which are mainly exposed at north and south edges and inside of Yili Block. On the basis of previous work, the volcanic rocks of Dahalajunshan Formation exposed in Wusunshan region have been taken as studying objects in this paper. By systematically field geology, profile and petrography, the rock association, stratigraphic sequence and its variation have been determined. The volcanic rocks of Dahalajunshan Formation are overall composed of basalt, andesite, dacite, rhyolite and intermediate-acid pyroclastic rock. At the south part of Yili block, the volcanic rocks in Wusunshan-Tasibashan area are mainly andesite (up to 50%), with a similar proportion of basalt, dacite and rhyolite. In the aspects of lava's eruption sequence, the acid magma was firstly erupted in Wusunshan-Tasibashan area, and then basic and acid magma were erupted in turn, which can be divided into 5~7 eruption cycles, with a character of fissure-central eruption.
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Key words:
- Dahalajunshan Formation /
- rock association /
- eruption sequence /
- Wusunshan /
- Western Tianshan
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