Magma evolution of Slamet Volcano, Central Java, Indonesia based on lava characteristic
Magma evolution of Slamet Volcano, Central Java, Indonesia based on lava characteristic
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基于熔岩特征的印度尼西亚中爪哇斯拉梅特火山岩浆演化
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
N. Setiawan
中科院分区：
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作者：
A. Harijoko;A. Milla;H. Wibowo;N. Setiawan
我们报道了斯拉梅特火山的岩浆演化，从时间和空间上看，这是其熔岩特征所代表的。Slamet火山位于印度尼西亚爪哇中部，是一座第四纪玄武岩层状火山，是广阔的舜达火山弧的一部分。叠层火山期可分为老叠层和年轻叠层。老片岩以玄武岩至安山岩(SiO249-59%)为特征，组成，西翼形态粗糙。同时，Young Slamet具有更多的镁铁质成分，玄武岩至玄武岩安山岩(SiO48-52%)，东侧形态较光滑。主、次、痕量元素的变化与岩石学特征相结合，表明片岩岩浆的分异过程主要是由分离结晶和岩浆混合作用引起的。详细的时间演化表明，每个老片岩和年轻片岩的岩浆经历了几次从镁铁质岩浆成分向较长英质岩浆成分转变的分异过程。旧Slamet演化得更密集，产生了广泛的二氧化硅含量，可能与过去的一些爆炸性事件相吻合。年轻的Slamet以孤次单元为代表的最年轻阶段，以镁铁质岩浆为主。老Slamet和年轻Slamet的不同导致了他们来自不同的岩浆室的结论。
We reported magma evolution of Slamet volcano, both temporally and spatially, as represented by its lava characteristics. Slamet volcano, located in Central Java Indonesia, is a Quaternary basaltic stratovolcano and part of the extensive Sunda volcanic arc. Slamet volcanism stage can be divided into Old Slamet and Young Slamet. Old Slamet characterized by basaltic to andesite (SiO2 49-59%), composition and have rough morphology in the western flank. Meanwhile, Young Slamet has more mafic composition, basaltic to basaltic andesite (SiO2 48-52%), and smoother morphology in the eastern flank. Variation of major, minor, and trace element combined with petrographic features suggest that the differentiation process of Slamet magma is dominantly caused by fractional crystallization and magma mixing. Detailed temporal evolution suggested that magma of each Old Slamet and Young Slamet undergo a differentiation process that changes magma composition from mafic to more felsic for several times. Old Slamet evolved more intensive, producing a wide range of silica content and might coincide with some explosive events in the past. Young Slamet which the youngest stage represented by Guci unit is dominated by mafic magma. Differences between Old and Young Slamet lead to the conclusion that they come from a different magma chamber.