| 长白山天池火山的岩石矿物学特征——对结晶分异过程和岩浆混合作用的启示 |
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| 关键词:Changbai Mountain Tianchi volcanoe mineralogy crystallization differentiation magma mixing |
| 基金项目:国家自然科学基金(编号: 41172304)；国土资源部公益性行业科研专项经费(编号: 201011003) |
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| 摘要: |
| Petrological and Mineralogical Characteristics of Tianchi Volcanoe,Changbai Mountain: Implications for Crystallization Differentiation and Magma Mixing |
| In this study, the authors analyzed lots of rocks and minerals from the whole eruptive sequence. Basalts mainly consist of plagioclase, augite, and olivine, whereas trachyte and comendite mainly consist of alkali-feldspar, ferroaugite, fayalite together with quartz, monazite and plenty of Fe-Ti oxides, which exhibits a crystallization differentiation trend. Meanwhile there are lots of disequilibrium phenomena such as unmatched mineral combination, zonation, and resorption. The authors infer that magma mixing existed in Heishigou basalt, trachyte of the first and third stage cone building and millennium eruption pumice of Tianchi volcanoes. According to the petrologic and chronologic characteristics, the trachytes evolved from different stages of basalts whereas the comenditie evolved from the cone building trachytes. The basalts were formed by partial melting and crystallization differentiation at different depths. |
| CHEN Xiao-wen,WEI Hai-quan,YANG Liang-feng,CHEN Zheng-quan.2017.Petrological and Mineralogical Characteristics of Tianchi Volcanoe,Changbai Mountain: Implications for Crystallization Differentiation and Magma Mixing[J].Acta Geoscientica Sinica,38(2):177-192. |
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