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Glass inclusions and melt volatile contents

机译：玻璃夹杂物和熔融挥发物

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Olivine-hosted glass inclusions were investigated from tephra samples erupted at Paricutin volcano on four different dates: May 26 and August 1, 1943; January 23, 1945; and March 31, 1948. These dates span the first two thirds of the 9 years eruption, during which time the tephra/lava mass-eruption rate fell dramatically. They also span the strong whole-rock compositional shift of 1947, attributed to the increased importance of crustal contamination. Nice of the 26 analyzed glass inclusions have lower SiO_2 contents than any previously analyzed Paricutin lava sample, ranging to below 53 wt percent. These silica-poor glasses are found in olivines erupted in 1943 and 1945, and provide evidence for melts that are parental to the main Paricutin lava suite. Total water contents in the glass inclusions measured by Fourier transform infrared (FTIR) spectroscopy vary considerably in all individual samples, with a total range of 1.8-4.0 wt percent. Total water contents are not correlated with SiO_2 of the glass, Mg # of the adjacent host olivine, or eruption date. Only two glass inclusions have carbonate contents (248 and 296 ppm CO_2) above the FTIR detection limit of approx 50 ppm CO_2; importantly, these inclusions also have the highest total water contents and among the highest SO_3~t values. These two inclusions were trapped at minimum depths of 9.0-9.6 km beneath the volcano. Thus, early degassing likely stripped most carbon from Paricutin melts at mid-crustal levels. Other glass inclusions yield minimum entrapment depths of 1.3-5.1 km based on water solubility limits. Total sulfur (0.30 to 0.01 wt percent SO_3) declines as SiO_2 contents increase from 52.7 ti 60.5 wt percent. This trend and the wide range of glass inclusion total water contents are interpreted to reflect degassing accompanied by fractional crystallization and assimilation at upper crustal levels.
机译：在四个不同的日期对Paricutin火山喷发的提菲拉样品进行了橄榄石质玻璃包裹体的研究：1943年5月26日和8月1日; 1945年1月23日;和1948年3月31日。这些日期跨越了9年喷发的前三分之二，在此期间，特非拉/熔岩的大喷发率急剧下降。由于地壳污染的重要性日益增加，它们还跨越了1947年整个岩石的强烈成分变化。在分析的26种玻璃夹杂物中，有一种具有比以前分析过的Paricutin熔岩样品更低的SiO_2含量，含量低于53 wt％。这些贫硅玻璃是在1943年和1945年爆发的橄榄石中发现的，为主要Paricutin熔岩套件的熔体提供了证据。通过傅里叶变换红外（FTIR）光谱法测量的玻璃夹杂物中的总水含量在所有单个样品中均存在很大差异，总范围为1.8-4.0 wt％。总水含量与玻璃的SiO_2，相邻的基质橄榄石的Mg＃或喷发日期无关。只有两个玻璃夹杂物的碳酸盐含量（248和296 ppm CO_2）高于FTIR检测极限约50 ppm CO_2;重要的是，这些夹杂物也具有最高的总水分含量和最高的SO_3〜t值。这两个包裹体被困在火山下方9.0-9.6 km的最小深度处。因此，早期脱气可能会在中壳水平将Paricutin熔体中的大部分碳剥离。根据水溶性极限，其他玻璃夹杂物的最小包埋深度为1.3-5.1 km。随着SiO_2含量从52.7 ti 60.5 wt％增加，总硫（0.30至0.01 wt％SO_3）下降。这种趋势和玻璃夹杂物总水含量的广泛变化被解释为反映了脱气，伴随着上地壳水平的分步结晶和同化。

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