| 长白山天池火山岩浆演化——来自主矿物成分的证据 |
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| 引用本文： | 李霓,樊祺诚,孙谦,张文兰.长白山天池火山岩浆演化——来自主矿物成分的证据[J].岩石学报,2004,20(3):575-582. |
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| 作者姓名： | 李霓 樊祺诚 孙谦 张文兰 |
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| 作者单位： | 1. 中国地震局地质研究所,北京,100029
2. 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学系,南京,210093 |
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| 基金项目： | 国家自然科学基金(批准号:40372044)、中国地震局联合基金(批准号:602025)及南京大学内生金属矿床成矿机制研究国家重点实验室开放基金(批准号:09-03-03)、国家科技攻关课题(批准号:2001BA601B06)的联合资助 |
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| 摘 要： | 长白山天池火山岩的主要矿物成分为橄榄石、辉石、长石和铁钛氧化物，经电子探针测试，其成分变化特征明显，自造盾阶段一造锥阶段一全新世喷发，橄榄石中铁含量增加，一直达到铁橄榄石的端元组分；单斜辉石中铁质和钠质含量增加；长石则从基性的拉长石向含钾、钠渐高的歪长石和透长石演化；铁钛氧化物含量则明显减少。三阶段斑晶矿物成分的变化反映了天池火山近200万年来岩浆演化的完整系列，符合分离结晶作用的演化趋势。
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| 关 键 词： | 长白山天池火山 主矿物成分 岩浆演化 结晶分异 |
| 文章编号： | 1000-0569/2004/020(03)-0575-82 |
| 修稿时间： | 2003年9月10日 |
Magma evolution of Changbaishan Tianchi volcano:Evidences from the main phenocrystal minerals |
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| LI Ni,FAN QiCheng,SUN Qian,ZHANG WenLan Institute of Geology,China Seismological Bureau,Beijing,China State Key Laboratory for Mineral Deposit Research.Magma evolution of Changbaishan Tianchi volcano:Evidences from the main phenocrystal minerals[J].Acta Petrologica Sinica,2004,20(3):575-582. |
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| Authors: | LI Ni FAN QiCheng SUN Qian ZHANG WenLan Institute of Geology China Seismological Bureau Beijing China State Key Laboratory for Mineral Deposit Research |
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| Institution: | LI Ni,FAN QiCheng,SUN Qian,ZHANG WenLan Institute of Geology,China Seismological Bureau,Beijing,China State Key Laboratory for Mineral Deposit Research,Department of Earth Sciences,Nanjing University,Nanjing,China |
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| Abstract: | The main phenocrysts of Changbaishan Tianchi volcanic rocks were olivines, pyroxenes, feldspars and Ti-Fe oxides,
which had clear characteristics of components evolution by electron microprobe analysis. From shield-forming stage, cone-forming stage
to Holocene eruptions, the content of iron in olivines kept increasing till it almost reached the end-member of fayalite; iron and sodium
contents also increased in clinopyroxene. In the meantime, feldspars evolved from labradorite to anorthoclase and sanidine which had
more potassium and sodium, and the contents of Fe-Ti oxides in rocks were reduced cleary. The evolution of phenocrysts in three
stages of Tianchi volcanic rocks reflected the complete series of Tianchi magma evolution in 2 Ma, which was in conformity with the
evolution tide of fractional crystallization. |
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| Keywords: | Changbaishan Tianchi volcano Composition of the mineral Magma evolution Fractional crystallization |
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