| 甘肃走廊南山朱龙关群的时代及其火山岩的岩石化学特征 |
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| 引用本文： | 徐晓春，岳书仓，刘因，周涛发.甘肃走廊南山朱龙关群的时代及其火山岩的岩石化学特征[J].安徽地质,1996(4). |
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| 作者姓名： | 徐晓春，岳书仓，刘因，周涛发 |
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| 作者单位： | 合肥工业大学资源与环境科学系 |
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| 摘 要： | 甘肃走廊南山朱龙关群是一套以发育大量基性火山岩为特征的浅变质火山沉积岩系，分布于托来山北坡刘口峡山至热水大坂一带以及朱龙关河北侧小柳沟和古浪峡等地。本文在前人工作的基础上，对区内地层的分布提出了新的见解，认为沙龙地区和北过龙至金龙河地区出露的一套浅变质火山－沉积岩石应划归来龙关群，并运用同位素年代学方法测定了该地层中火山岩的成岩时代，首次较确切地给出了这套浅变质岩系的时代归属，从而进一步确定了朱龙关群的时空分布。同时根据火山岩岩石化学特征研究，认为朱龙关群火山岩的成岩大地构造背景为陆内裂谷。
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| 关 键 词： | 火山岩 岩石化学 同位素年代 构造背景 甘肃走廊南山 |
TEH TIME AND PETROCHEMICAL CHARACTERISTICS OF VOLCANICS OF ZHULONGGUAN GROUP IN ZOULANGNANSHAN,GANSU |
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| Xu Xiaochun; Yue Shucang.TEH TIME AND PETROCHEMICAL CHARACTERISTICS OF VOLCANICS OF ZHULONGGUAN GROUP IN ZOULANGNANSHAN,GANSU[J].Geology of Anhui,1996(4). |
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| Authors: | Xu Xiaochun; Yue Shucang |
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| Abstract: | The volcanic rocks of Zhulongguan group are mainly basic rocks which are older in formation time,and deeper in metamorphic degree in Zoulangnanshan.Gansu province.In this paper,thetime the volcanic rocks formed has been measured by using Sm- Nd isotope geochronology for the first time. And the space-time.distribution of the Zhulongguan Group and the volcanic rocks occurring in it has been further determined.The vlocanic rocks are poor in Potassium and rich in albite.The rock series are mainly thiloeiitic- and alkali-basaltic.The characteristics of the chemical petrology,the compositions of Nd isotope and the distribution of the volcanic rocks show that the rock-forming tectonic background was an intracontinental rift. |
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| Keywords: | volcanic rocks petrochemistry isotope geochronology tectoinc background Gansu province |
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