Microlite textures and volatile contents of obsidian from the Inyo volcanic chain, California
Microlite textures and volatile contents of obsidian from the Inyo volcanic chain, California
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加利福尼亚州因约火山链黑曜石的微晶结构和挥发物含量
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
C. Mercer
中科院分区：
文献类型：
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作者：
J. Castro;C. Mercer
我们测试的假设，微晶结构记录在岩浆上升进行脱气。我们比较微晶数密度（NV）和H2O浓度的火山碎屑和喷出的黑曜石（OBS）从Inyo火山链，加利福尼亚州。比较显示微晶NV和H2O之间的弱相关性，然而，大多数黑曜石（OBSs）的一个给定的挥发性含量表现出广泛的NV。除气以外的因素也必然影响最终的基质结构。我们假设，OBS纹理记录不同的上升速率和居住历史之前，从管道喷发。我们的结论是，微晶不敏感地指示岩浆脱气的程度，而是，他们提供了定性的指示岩浆上升和停留时间。
We test the hypothesis that microlite textures record progressive degassing during magma ascent. We compare microlite number density (NV) and H2O concentrations in pyroclastic and effusive obsidian (OBS) from the Inyo Volcanic Chain, CA. Comparisons reveal a weak correlation between microlite NV and H2O; however, most obsidians (OBSs) of a given volatile content exhibit a wide range of NV. Factors other than degassing must also influence final groundmass texture. We postulate that OBS textures record different ascent rates and residence histories prior to eruption from the conduit. We conclude that microlites do not sensitively indicate the extent of magmatic degassing, rather, they provide qualitative indications of magma ascent and residence time.