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新疆阿尔泰石炭纪火山岩的地质特征和构造背景——兼与泥盆纪火山岩作比较
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引用本文:袁旭音,周华平.1999.新疆阿尔泰石炭纪火山岩的地质特征和构造背景——兼与泥盆纪火山岩作比较[J].地质论评,45(7):1126-1131,[DOI]:.
Yuan Xuyin,Zhou Huaping.1999.Geological Characteristics and Tectonic Setting of Carboniferous Volcanic Rocks in Altay, Xinjiang——A Comprison with Devonian Volcanic Rocks in the Same Area[J].Geological Review,45(7):1126-1131.
DOI:
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作者单位
袁旭音 中国地质科学院南京地质矿产研究所210016 
周华平  
中文摘要:新疆阿尔泰石炭纪火山岩主要分布在东北部,主要由流纹岩、英安岩和碎斑熔岩组成。它们均属陆相火山岩,可以划分为4种火山岩相,即喷溢相、降落相、侵出相和火山 喷发沉积相。火山活动特征是从爆发转向喷溢,最后以侵出形式挤出火山通道。其地球化学特征是明显富集K、Rb、Th,亏损Ti、Yb;稀土元素含量较高,配分曲线出现明显的Eu和Ce负异常;锶同位素初始比值高于大陆火山岩的平均值。与泥盆纪火山岩不同,石炭纪火山岩形成背景属于造山挤压带,物质主要来源于地壳。与石炭纪火山作用有关的矿床主要是热液矿床。
中文关键词:火山岩 石炭纪 泥盆纪 阿尔泰 新疆
 
Geological Characteristics and Tectonic Setting of Carboniferous Volcanic Rocks in Altay, Xinjiang——A Comprison with Devonian Volcanic Rocks in the Same Area
NameInstitution
Yuan XuyinNanjing Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, Nanjing, 210016
Zhou Huaping
Abstract:Carboniferous volcanic rocks in Altay, Xinjiang, mainly exist in its northeastern part.They consist of rhyolite,dacite and cataclast lava.These continental volcanic rocks can be divided into four lithofacies,i.e.effusive facies,air fal l facies,extrusive facies and eruptive sedimentary facies.The volcani c activities occurred from explosion,through eruption to extrusion at last.T hey are rich in K,Rb,Ba and Th and poor in Ti and Yb.The y have high ΣREE contents and show obvious negative Eu and Ce anomalies.Initial Sr isotopic ratios for Carboniferous volcanic rocks are higher than the average value of continental volcanic rocks.Their tectonic setting is the orogenic compr ession belt, and the material components are derived largely from the crust, whi ch are d ifferent from the case of Devonian volcanic rocks in the same area. The related ore dep osit s are volcanic hydrothermal ones.
keywords:volcanic rock  Carboniferous  tectonic setting  Altay, Xinjiang
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