MORB) is typically comprised of pillow basalts with an MgO content of ∼7 wt.% (White and Klein, 2014). Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. This magma oozes out onto the sea floor to form pillow basalts (Figure 18.1), breccias (fragmented basaltic rock), and flows, interbedded in some cases with limestone or chert. Composition. _____ composition lava is erupted at ocean ridges, whereas _____ composition lava is erupted on continents. In general, the more felsic the composition (richer in silica - resulting in an Intermediate composition), the larger the pillows, due to the increase in viscosity of the erupting lava. The great continental flood-basalt eruptions of the geological past are the largest eruptions of lava on Earth, with known volumes of individual lava flows exceeding 2000 cubic kilometres. Ans: D Section: 4-4: Magma Differentiation 53. 19) Eruptions of rhyolite lava tend to be more explosive than basaltic and andesitic lavas because _____. Till, in geology, unsorted material deposited directly by glacial ice and showing no stratification.Till is sometimes called boulder clay because it is composed of clay, boulders of intermediate sizes, or a mixture of these. Pillow basalts attest to the oceanic origins of the rock layers, as they formed from lava flows that cooled on the ocean floor. When equal amounts of a basaltic and granitic magma mix, the resulting magma is A) mafic. pillow basalt 10. What is Basalt? The rock fragments are usually angular and sharp rather than rounded, because they are deposited from the ice and have undergone little water transport. D) andesitic. Pillow lavas are commonly of basaltic composition, although pillows formed of komatiite, picrite, boninite, basaltic andesite, andesite, dacite or even rhyolite are known. For comparison, the ongoing eruption of Kilauea volcano on Hawaii has produced just 1.5 cubic kilometres in 16 years! In terms of area, there is very likely more pillow basalt … Pillow lavas are volumetrically the most abundant type because they are erupted at mid-ocean ridges and because they make up the submarine portion of seamounts and large … Flood Basalts. The trace elements in basaltic rocks which most authors have unanimously found t o be among the most mobile during seawater weathering are Rb, B and Cs. This "pillow" texture is very common in underwater basaltic flows and is diagnostic of an underwater eruption environment when found in ancient rocks. Contact with the water quenches the surface and the lava forms a distinctive pillow shape, through which the hot lava breaks to form another pillow. C) felsic. The resulting blobs of lava are known as pillows, and they tend to form piles around a sea-floor lava vent (Figure 4.21). 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