Volcano - Calderas, Magma, Eruptions: Most calderas—large circular or oval depressions more than 1 km (0.6 mile) in diameter—have been formed by inward collapse of landforms after large amounts of magma have been expelled from underground. Many are sur
The magma expelled from the fissure is olivine- and plagioclase-bearing mildly alkali basalt that exhibits uniform and rather primitive whole-rock composition. This event provides a rare opportunity to assess deep magmatic processes in Iceland. Melt inclusions (MIs) hosted in olivine phenocrysts were...
But, of course, it could also be expelled from the magma itself as it cooled. Ali, naravno, takođe bi mogli nastati od same magme dok se ona hladila. OpenSubtitles2018.v3 Then magma, I suppose, is Mother Nature. A magma, pretpostavljam, je majka priroda? OpenSubtitles2018....
such as the eruption ofVesuviusthat destroyedPompeiiin 79ce. Volcanic eruptions have captured the imagination of people overmillennia, and they feature in several mythologies as well as works of fiction. These eruptions alsoplay a role in climate change, with expelled gases such ascarbon dioxidecont...
thick column of this melt is required to form each of these chromitite layers. Therefore, an enormous volume of melt appears to have been involved in the generation of all the Bushveld chromitite layers, with half of this melt being expelled from the magma chamber. We suggest that the ...
proposes an explanation for this discrepancy. When magma is rapidly expelled from a volcano, it undergoes rapid cooling. This induces the formation of crystals, resulting in a sudden increase in the viscosity of the magma. In turn, this produces magma fragmentation, creating a highly explosive eru...
There is no mineralogic evidence for this abundance of magmatic OH in the Hu- sereau dike, and one may speculate that it was expelled during solidification as a HzO-rich vapor phase. Some of this HzO-rich vapor might have been consumed in the pervasive conversion of magmatic peric1ase in...
11). To account for these differences, Irvine (1980) proposed a process of “infiltration metasomatism”, whereby the chemical discontinuities were caused by reaction of olivine with upwardly migrating interstitial melt expelled by compaction of the underlying accumulating olivine-dominant crystal mush, ...
The large amount of gas expelled into the atmosphere during volcanic eruptions (i.e. volcanic outgassing) is the most obvious display of magmatic volatile release. However, owing to the large intrusive:extrusive ratio, and considering the paucity of volatiles left in intrusive rocks after final ...
stage of magmatic crystallization, they are exsolved from the melt as a separate fluid phase that under most circumstances is a supercritical gas. This process has been referred to asresurgent boiling, a somewhat misleading term because the exsolved fluid is not necessarily expelled from the ...