【摘要】：云南騰沖大六沖火山上,從山腰大丫口至山頂沿途廣泛出露1套青灰色—紫紅色的層狀火山巖,但僅通過野外肉眼觀察難以判定其為火山碎屑巖或是熔巖,而研究火山巖的基質(zhì)結(jié)構(gòu)可以幫助判斷其所屬巖相。文中將其基質(zhì)結(jié)構(gòu)與火山通道相、侵出相及溢流相熔巖的基質(zhì)結(jié)構(gòu)作對比,并結(jié)合與溢流相熔巖氣孔形態(tài)的比較結(jié)果,認(rèn)為它屬于爆發(fā)相產(chǎn)物,定名為英安質(zhì)晶屑熔結(jié)凝灰?guī)r。通過對大六沖各火山翼的野外勘查、覆蓋式采樣及系統(tǒng)的鏡下鑒定,區(qū)分了各巖相火山巖的野外和顯微特征,大致劃分了各巖相的分布范圍:溢流相應(yīng)為早期噴發(fā)形成的基底,部分區(qū)域被爆發(fā)相所覆蓋;爆發(fā)相英安質(zhì)晶屑熔結(jié)凝灰?guī)r和火山角礫巖主要分布在火山西翼、南翼和東北翼;火山通道相位于主峰山頂南側(cè)約100m的位置,直立產(chǎn)出,直徑超過100m;侵出相僅在山頂附近有出露。因此,推測大六沖火山早期經(jīng)歷過較大規(guī)模的巖漿溢出,時隔多年后又發(fā)生爆炸式噴發(fā),最后以巖漿的侵出為標(biāo)志而停止活動,火山頸因受長期剝蝕而出露。
[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.
【作者單位】： 中國地震局地質(zhì)研究所活動構(gòu)造與火山重點實驗室;
【基金】：國家自然科學(xué)基金(41472305) 中國科學(xué)院大陸碰撞和高原隆升重點實驗室科學(xué)基金(LCPU201502)共同資助
【分類號】：P588.14

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