摘要
根据岩浆演化和地球物理深部探测,天池火山之下存在地壳和地幔双层岩浆房。地幔玄武质岩浆向地壳岩浆房的补给,保持了天池火山逾百万年持续不断的喷发活动。本文从天池火山千年大喷发浮岩中的玄武质粗安岩-粗安岩角砾和条带状岩浆的岩相学、矿物学和岩石化学研究,提出地幔的粗面玄武质岩浆向地壳岩浆房的注入,触发千年大喷发,初步探讨了天池火山千年大喷发的岩浆混合作用与喷发机制。
Studies on magma evolution and on geophysical observations indicate that there are two magma chambers beneath Tianchi volcano. Continuous basaltic magma influx from mantle chamber to crust chamber are essential to the keep Tianchi volcano active over a million years, and are also important to interpret the magma evolution of Tianchi volcano. In this paper, we present evidence of magma influx and magma mixing from the gray pumice of the Millennium eruption of Tianchi volcano. The breccias in the gray pumice and the banded structures indicate the occurrence of magma mixing. The petrological, mineralogical and chemical studies of these samples reveal the story of magma influx and mixing, which may trigger the Millennium eruption of Tianchi volcano.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第6期1703-1708,共6页
Acta Petrologica Sinica
基金
国家自然科学基会(No.40372044)
