Differential alteration of basaltic lava flows and hyaloclastites in Icelandic hydrothermal systems
نویسندگان
چکیده
منابع مشابه
Lava Flows during Basaltic Eruptions
12 Observations in the USA, Iceland, and Tenerife, Canary Islands, reveal how processes occurring 13 during basaltic eruptions can result in complex physical and stratigraphic relationships between lava 14 and proximal tephra fall deposits around vents. Observations illustrate how basaltic lavas can 15 disrupt, dissect (spatially and temporally) and alter sheet-form fall deposits. Complexity ar...
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Accurate forecasts of lava flow length rely on estimates of eruption andmagma properties and, potentially more challengingly, on an understanding of the relative influence of characteristics such as the apparent viscosity, the yield strength of the flow core, or the strength of the lava’s surface crust. For basaltic lavas, the relatively high frequency of eruptions has resulted in numerous oppo...
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Pleistocene basaltic lava flows, consisting of trachybasalt and basaltic trachyandesite, cover an area north-northwest of Shahre-Babak in southeastern Iran. The whole rock chemistry indicates that the lavas are dominantly alkaline and mildly calc-alkaline. Variation diagrams of SiO2 with major and trace elements are consistent with fractional crystallization processes involving olivine, pyroxen...
متن کاملHydrothermal alteration of kimberlite by convective flows of external water
Kimberlite volcanism involves the emplacement of olivine-rich volcaniclastic deposits into volcanic vents or pipes. Kimberlite deposits are typically pervasively serpentinised as a result of the reaction of olivine and water within a temperature range of 130-400 °C or less. We present a model for the influx of ground water into hot kimberlite deposits coupled with progressive cooling and serpen...
متن کاملCrystal size distribution analysis of plagioclase in Neogene-Quaternary olivine basaltic lava flows in Dehaj-Javazm area, northwest of Shahre-Babak, Kerman
1. Introduction The rather limited Neogene-Quaternary olivine basaltic lava flows are outcropped in the Dehaj-Javazm area, north of Share-Babak, in the NW of Dehaj-Sarduieh magmatic belt as a part of the Urumieh-Dokhtar magmatic assemblage (UDMA). The rocks contain significant amounts of plagioclase both as phenocrysts and microliths in the microlithic groundmass which play an important role i...
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ژورنال
عنوان ژورنال: Geothermal Energy
سال: 2015
ISSN: 2195-9706
DOI: 10.1186/s40517-015-0031-7