| The revised age for the Jozini Formation rhyolites is also of significance for petrogenetic models proposed for the Karoo silicic magmatism. |
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| Additional weak silicic solutions formed thin encrustations of quartz on the calcite in delicate encrustation pseudomorphs. |
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| Salic magmas ranged widely from silicic to feldspathoidal and from peraluminous to peralkaline. |
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| The lenses are separated by locally discordant horizons of ferruginous, silicic or graphitic, strongly schistose sedimentary to volcanic rocks. |
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| In both areas, the silicic magmatism is thought to have been a result of intrusion of mantle-derived mafic magmas into extending crust. |
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| The cliffs rising like cones are made up of sheet layers of hydroquarzite, silicic limestone and mass geyserite. |
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| Thus, the surface to volume ratio should be related to silicic acid flows in size-based biogeochemical models of planktonic ecosystems. |
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| A consideration of Rheic margin tectonics reveals several possible source terranes for silicic explosive volcanism. |
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| The silicic rocks are interpreted as crustal melts resulting from intrusion of mafic magmas. |
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| If dandruff is a concern, look for ingredients such as silicic acid or willow bark extract and selenium, which help control itching and flaking. |
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| In geothermal waters, hydrogen sulphide, silicic acid, and boric acid may also be important. |
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| Unchallengeable examples of what are assumed to have been beta quartz appear to be limited to occurrences in silicic volcanic rocks, such as rhyolite, liparite, and dacite. |
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| The injection of a mafic magma into a more silicic magma chamber is an important trigger mechanism in moderate-sized andesitic, dacitic and rhyolitic eruptions. |
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| Grasses readily absorb silica in the form of silicic acid from the soil, and most silica is accumulated in the aerial parts as amorphous hydrated silica. |
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| The mineral waters vary considerably in temperature, mineralisation, radon, silicic acid and fluorine content, and are suitable for treatment of a wide range of diseases. |
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| In the Antarctic Peninsula, an early Jurassic gap in intrusive activity was followed by widespread mid-Jurassic silicic plutonism in eastern Graham Land. |
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| Magmatic inclusions in silicic and intermediate volcanic rocks. |
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| The biogenic silica composing the cell wall is synthesised intracellularly by the polymerisation of silicic acid monomers. |
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| They are dominantly mafic, but also can have significant ultramafic and silicic components, and some are dominated by silicic magmatism. |
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| Most silicic lava flows are extremely viscous, and typically fragment as they extrude, producing blocky autobreccias. |
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| Remobilization of silicic intrusion by mafic magmas during the 2010 Eyjafjallajokull eruption. |
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| Researchers in Spain fed mice beer and gave some a solution of silicic acid. |
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| Within the intrusion, the mineralized zone is variably silicic, chloritic, and contains variable concentrations of pyrite, arsenopyrite and gold. |
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| Its amount increases abruptly close to the contacts of the anorthosites with silicic rocks, where perthitic alkali feldspar partly replaces plagioclase. |
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| Silver mineralization on the property is hosted in the Cretaceous Challacollo volcanic complex of intermediate to silicic volcanic rocks and associated sedimentary rocks. |
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| It is apparent that there is a background concentration of silica as silicic acid of about 2 m moles, independent of pH in the near neutral to alkaline pH range. |
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| In the present work, Silicic acid is used as a binder because it has more active replaceable hydroxyl groups, with wide range applications. |
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