云南腾冲大六冲火山岩岩石结构与岩相特征
发布时间：2018-08-02 09:09
【摘要】：云南腾冲大六冲火山上,从山腰大丫口至山顶沿途广泛出露1套青灰色—紫红色的层状火山岩,但仅通过野外肉眼观察难以判定其为火山碎屑岩或是熔岩,而研究火山岩的基质结构可以帮助判断其所属岩相。文中将其基质结构与火山通道相、侵出相及溢流相熔岩的基质结构作对比,并结合与溢流相熔岩气孔形态的比较结果,认为它属于爆发相产物,定名为英安质晶屑熔结凝灰岩。通过对大六冲各火山翼的野外勘查、覆盖式采样及系统的镜下鉴定,区分了各岩相火山岩的野外和显微特征,大致划分了各岩相的分布范围:溢流相应为早期喷发形成的基底,部分区域被爆发相所覆盖;爆发相英安质晶屑熔结凝灰岩和火山角砾岩主要分布在火山西翼、南翼和东北翼;火山通道相位于主峰山顶南侧约100m的位置,直立产出,直径超过100m;侵出相仅在山顶附近有出露。因此,推测大六冲火山早期经历过较大规模的岩浆溢出,时隔多年后又发生爆炸式喷发,最后以岩浆的侵出为标志而停止活动,火山颈因受长期剥蚀而出露。
[Abstract]:On the great six Chong volcano in Tengchong, Yunnan, 1 sets of gray and purple red layered volcanic rocks are widely exposed from the mouth of the hillside to the top of the mountain, but it is difficult to determine the volcanic clastic rock or lava by the naked eye observation, and the study of the matrix structure of the volcanic rocks can help to judge the lithofacies of the rocks. The matrix structure of the facies, the emplacement phase and the overflow phase lava is compared, and combined with the comparison with the pore shape of the overflow lava, it is believed that it belongs to the explosive phase and is named as the Angan crystal chip fusible tuff. By the field investigation of the great six flags, the covering type sampling and the system mirror identification have distinguished the various lithofacies of the volcanic rocks. The field and microscopical features roughly divide the distribution of the lithofacies: the overflow corresponds to the basement of the early eruption, and the part of the area is covered by the eruption phase; the explosive phase Angan crystal chip melted tuff and volcanic breccia are mainly distributed in the West Wing of the volcano, the south wing and the northeastern wing, and the phase of the volcanic passage is about 100m at the south side of the peak of the main peak. It is erect output, with a diameter of more than 100m; the invading phase is exposed only near the top of the mountain. Therefore, it is presumed that the big six Chong volcano had experienced a large scale of magma spillover in the early stages of the volcano, after many years of eruption erupted again. Finally, the eruption of magma was stopped, and the volcanic necks were exposed to long erosion.
【作者单位】： 中国地震局地质研究所活动构造与火山重点实验室;
【基金】：国家自然科学基金(41472305) 中国科学院大陆碰撞和高原隆升重点实验室科学基金(LCPU201502)共同资助
【分类号】：P588.14
[Abstract]:On the great six Chong volcano in Tengchong, Yunnan, 1 sets of gray and purple red layered volcanic rocks are widely exposed from the mouth of the hillside to the top of the mountain, but it is difficult to determine the volcanic clastic rock or lava by the naked eye observation, and the study of the matrix structure of the volcanic rocks can help to judge the lithofacies of the rocks. The matrix structure of the facies, the emplacement phase and the overflow phase lava is compared, and combined with the comparison with the pore shape of the overflow lava, it is believed that it belongs to the explosive phase and is named as the Angan crystal chip fusible tuff. By the field investigation of the great six flags, the covering type sampling and the system mirror identification have distinguished the various lithofacies of the volcanic rocks. The field and microscopical features roughly divide the distribution of the lithofacies: the overflow corresponds to the basement of the early eruption, and the part of the area is covered by the eruption phase; the explosive phase Angan crystal chip melted tuff and volcanic breccia are mainly distributed in the West Wing of the volcano, the south wing and the northeastern wing, and the phase of the volcanic passage is about 100m at the south side of the peak of the main peak. It is erect output, with a diameter of more than 100m; the invading phase is exposed only near the top of the mountain. Therefore, it is presumed that the big six Chong volcano had experienced a large scale of magma spillover in the early stages of the volcano, after many years of eruption erupted again. Finally, the eruption of magma was stopped, and the volcanic necks were exposed to long erosion.
【作者单位】： 中国地震局地质研究所活动构造与火山重点实验室;
【基金】：国家自然科学基金(41472305) 中国科学院大陆碰撞和高原隆升重点实验室科学基金(LCPU201502)共同资助
【分类号】：P588.14
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