Long-term compositional and eruptive behavior of Mauna Loa Volcano: Evidence from prehistoric caldera basalts
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Caldera
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Rift zone
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The well-documented 1877 submarine eruption of Mauna Loa volcano occurred offshore from Kealakekua Bay, west Hawaii.The three vents active during the eruption are aligned parallel to the Kealakekua fault, which apparently bounds the north side of a large slump structure of Mauna Loa volcano.Samples of 1877 glassy basalhc lava were collected by submersible from these eruption sites, at water depths from about 100 m to greater than 1000 m.Because their age, depths, and ambient ocean temperatures are known, these samples of basalt permit determination of palagonitization rates at different temperatures.The rate is found to increase 1.8 times for each 10 °C of temperature increase.At 4-5 °C {the prevailing water temperature on much of the ocean floor) the rate is 0.003-0.03]1m per year, and the extrapolated rate at 300 °C {the temperature at some hot springs on ridges) is O.Z7-Z.7 mm per day.These samples and others from nearby subaerially erupted lavas that flowed into the sea allow determination of vesicularity at different water depths.The data indicate that the decrease in vesicularity of subaerial lava flows that cross a shoreline and flow into increasingly deeper water is largely explicable by the pressure effect, and hence the vesicularity of such flows can provide information on the depth of cooling of ancient lava.However, vesicle volume and size are slightly smaller than expected, probably because of re-solution of volatiles back into the melt as pressure increases.
Variation (astronomy)
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This chapter contains sections titled: Introduction Geological Setting and Eruptive Record Mineral Compositions Lava Compositions Discussion Conclusions
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Variation (astronomy)
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