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首页> 外文期刊>Contributions to Mineralogy and Petrology >Volatiles in glasses from Mauna Loa Volcano, Hawai'i: implications for magma degassing and contamination, and growth of Hawaiian volcanoes
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Volatiles in glasses from Mauna Loa Volcano, Hawai'i: implications for magma degassing and contamination, and growth of Hawaiian volcanoes

机译：夏威夷莫纳洛亚火山的玻璃挥发物：对岩浆脱气和污染的影响以及夏威夷火山的生长

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Glasses from Mauna Loa pillow basalts, recent subaerial vents, and inclusions in olivine were analyzed for S, Cl, F, and major elements by electron microprobe. Select submarine glasses were also analyzed for H2O and CO2 by infrared spectroscopy. The compositional variation of these tholeiitic glasses is dominantly controlled by crystal fractionation and they indicate quenching temperatures of 1,115–1,196 °C. Submarine rift zone glasses have higher volatile abundances (except F) than nearly all other submarine and subaerial glasses with the maximum concentrations increasing with water depth. The overwhelming dominance of degassed glasses on the submarine flanks of Mauna Loa implies that much of volcano's recent submarine growth involved subaerially erupted lava that reached great water depths (up to 3.1 km) via lava tubes. Anomalously high F and Cl in some submarine glasses and glass inclusions indicate contamination possibly by fumarolic deposits in ephemeral rift zone magma chambers. The relatively high CO2 but variable H2O/K2O and S/K2O in some submarine rift zone glasses indicates pre-eruptive mixing between degassed and undegassed magma within Mauna Loa's rift system. Volatile compositions for Mauna Loa magmas are similar to other active Hawaiian volcanoes in S and F, but are less Cl-rich than Lō'ihi glasses. However, Cl/K2O ratios are similar. Mauna Loa and Lō'ihi magmas have comparable, but lower H2O than those from Kilauea. Thus, Kilauea's source may be more H2O-rich. The dissimilar volatile distribution in glasses from active Hawaiian volcanoes is inconsistent with predictions for a simple, concentrically zoned plume model.
机译：用电子探针分析了来自冒纳罗亚火山枕玄武岩，最近的地下通风口和橄榄石中夹杂物的玻璃中的S，Cl，F和主要元素。还通过红外光谱分析了选定的海底玻璃中的H2 O和CO2 。这些可塑玻璃的成分变化主要由晶体分级控制，它们表明淬火温度为1,115–1,196°C。水下裂谷区玻璃的挥发性丰度（F除外）比几乎所有其他水下和海底玻璃具有更高的挥发性，最大浓度随水深而增加。脱气的玻璃支配着莫纳罗亚火山海底两侧的压倒性优势，这表明火山最近的海底生长大部分涉及地下喷发的熔岩，这些熔岩通过熔岩管达到了很大的水深（高达3.1公里）。一些海底玻璃和玻璃夹杂物中异常高的F和Cl表示可能存在短暂裂谷带岩浆室内的富马酸沉积物。在一些海底裂谷带玻璃中，CO2相对较高，但H2 O / K2 O和S / K2 O较高，这表明莫纳河内脱气岩浆和未脱气岩浆之间的喷发前混合Loa的裂痕系统。莫纳罗亚火山岩浆的挥发性成分与S和F中其他活跃的夏威夷火山相似，但与Lō'hihi眼镜相比，其Cl含量较低。然而，Cl / K 2 O比率是相似的。莫纳罗亚火山岩和洛伊希岩浆岩具有可比性，但比基拉韦厄火山岩中的H2 O低。因此，基拉韦厄的来源可能富含H2 O。来自活跃的夏威夷火山的玻璃中不同的挥发物分布与对简单的，同心区域羽状流模型的预测不一致。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2003年第5期|570-591|共22页
  • 作者

    Michael G. Davis; Michael O. Garcia; Paul Wallace;

  • 作者单位

    Department of Geology and Geophysics University of Hawai'i Honolulu HI 96822 USA;

    Department of Geology and Geophysics University of Hawai'i Honolulu HI 96822 USA;

    Ocean Drilling Program Texas AM University College Station TX 77845 USA;

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