| 词汇 | andesite |
| 释义 | BETA Examples of andesiteandesite isn’t in the Cambridge Dictionary yet. You can help! For example the basalts could be inferred to have intraplate characteristics, and the andesites to be subduction-related. Crustally-contaminated andesites could be produced by combined assimilation and fractional crystallization of basaltic magmas. We have undertaken three independent field tests to determine whether the magnetization of the andesite and basalt sheets is primary. This supports the derivation of andesites from basaltic andesites by fractional crystallization processes. This implies that remanence was fixed before the andesite brecciated during emplacement. The geochemical fingerprints of different tectonic magmatic environments using hydromagmaphile elements abundances of tholeiitic basaltic andesites. The basaltic-andesite, given for comparison, is the median composition of five unaltered basaltic andesites from the upper sequence. Therefore, production of the silicic magma by crystal fractionation of the basaltic andesite can be ruled out. They show a coherent fractionation trends from basalt to basaltic andesites. This puts some time constraints on the evolution within the silicic reservoir, implying that the crystallization occurred before the basaltic andesite injection. |
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