| 词汇 | andesitic |
| 释义 | BETA Examples of andesiticandesitic isn’t in the Cambridge Dictionary yet. You can help! We attribute this to the presence in the siltstones of felsic ash particles which are sometimes identifiable in addition to epiclastic andesitic grains. Dacitic to andesitic basalts contain phenocrysts of pyroxene, altered feldspar and minor quartz often set in a groundmass of epidote-chlorite-glass. The matrix is andesitic in composition with high concentrations of potassium, aluminium and iron. They interpreted the rhyolites to have been formed by partial melting of andesitic crust of the arc. Welded andesitic ignimbrites are rarer and generally of comparatively low volume. It suggests that the dominant original composition was andesitic to rhyodacitic, and that differentiation to rhyolite was not common. A chamber-like structure measuring 3.5 m (north-south) 3.4 m (east -west) and about 1.5 m high was built approximately at the level of tepetate (subsoil andesitic tuff). Worldwide, most high-sulphidation systems occur in andesitic to rhyodacitic lavas, ash flows or equivalent felsic intrusives in relatively mature arcs. Its primary lavas are andesitic and basaltic flows, although it has also produced pyroclastic flows. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Simultaneous eruption of ash-flow tuffs resulted in a sequence of interbedded tuffs, sedimentary breccias and andesitic lavas. The data trend away from a position between average basalt and andesite, confirming the andesitic or basaltic andesitic nature of their source. The pottery was slab-built earthenware of andesitic-tephra clay mixed with calcareous or mineral sand tempers and fired at a low temperature. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Releasing 9.5km3cumi 0 of lava, the volcano ejected primarily dacitic tephra, accompanied by rhyodacite, andesite, and minuscule amounts of andesitic and basaltic scoria. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. That eruptive episode was followed by a hiatus that ended with a small andesitic eruption about 4,300 years ago. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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