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Why can minerals that form early in fractional crystallization grow distint?
Wiki User
∙ 6y ago
They form more euhedral shapes because they are the first to crystallize, and don't have to compete for room.
Wiki User
∙ 13y ago
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Relate the classification og igneous rocks to bowen's reaction series?
The left branch of the Y-shaped arrangement consists of the discontinuous series that begins with olivine at the highest temperature and progresses through pyroxene, amphibole, and biotite as the temperature decreases. This series is discontinuous because the reaction occurs at a fixed temperature at constant pressure wherein the early-formed mineral is converted to a more stable crystal. Each mineral in the series displays a different silicate structure that exhibits increased polymerization as the temperature drops; olivine belongs to the island silicate structure type; pyroxene, the chain; amphibole, the double chain; and biotite, the sheet. On the other hand, the right branch is the continuous reaction series in which plagioclase is continuously reacting with the liquid to form a more albitic phase as the temperature decreases. In both cases, the liquid is consumed in the reaction. When the two reaction series converge at a low temperature, minerals that will not react with the remaining liquid approach eutectic crystallization. Potash feldspar, muscovite, and quartz are crystallized. The phases that are crystallized first are the common minerals that compose basalt or gabbro, like bytownite or labradorite with pyroxene and minor amounts of olivine. Andesite or diorite minerals, such as andesine with either pyroxene or amphibole, crystallize next and are followed by orthoclase and quartz, which are the essential constituents of rhyolite or granite. A basaltic liquid at the top of the Y can descend to the bottom of the series to crystallize quartz only if the earlier reactions are prevented. As demonstrated above, complete reactions between early-formed minerals and the liquid depletes the supply of the liquid, thereby curtailing the progression down the series. One means by which basaltic magma can be transformed to rocks lower in the series is by fractional crystallization. In this process, the early-formed minerals are removed from the liquid by gravity (such minerals as olivine and pyroxene are denser than the liquid from which they crystallized), and so unreacted liquid remains later in the series.
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Early Hours was created in 2004-03.
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What event was most likely responsible for the oxygenation of Earth's atmosphere between two and three billion years ago?
There was an event commonly known as the "Great Oxygenation Event" which occurred around 2.4 billion years ago. One theory suggests that this was caused due to the production of oxygen by micro organisms. In the early Earth this oxygen normally reacted with minerals in the surface rocks during weathering (creating very thick beds of oxidised rocks such as banded iron formations). However a point was reached where no more minerals were available to react with the oxygen and so it began to accumulate in the atmosphere. Please see the related link for more information.
What term refers to the removal and isolation of early-formed mineral grains that can cause the composition of the remaining magma to change?
The process of fractional crystallization is part of igneous differentiation, where minerals crystallize at different temperatures and under complex circumstances.
How is partial melting related to fractional crystallization?
Partial melting occurs in rocks because the different minerals that compose rocks have different melting points. For example, felsic minerals (e.g. quartz and feldspar) melt at around 700 degrees Celsius while mafic minerals (e.g. pyroxene and olivine) melt at around 1200 degrees Celsius. Therefore, felsic minerals will melt first leaving the mafic minerals solid.Fractional crystallization occurs when minerals from a magma cool and crystallize out of the magma. The first crystals to melt in partial melting will be the first minerals to crystallize out when the magma begins to cool. Therefore, mafic minerals will crystallize first, followed by felsic minerals.Both partial melting and fractional crystallisation tend to produce a more felsic magma than their source rocks.The difference is simply that they are the reverse of one another, heat it up, cool it down. Things that melt first solidify last and separate from one another.
Which minerals crystallize early in Bowen's reaction series?
Amphibole, plagioclase feldspars, olivine, pyroxene, and biotite mica have the highest crystallization temperatures.
Why can minerals that form early in factional crystallization grow distinct crystal shapes?
In a fluid (magma) they are free to grow in any direction, and therefore are able to grow into euhedral crystals.
Why can minerals that form early in fractional crystillization form certain shapes?
Hmm.... No idea. But I do know this: Gravitation causes dispersed matter to coalesce. SHANNON VANDERMELON... Shannon is a caveman. Hm. I would think so though. Seems right.
Can minerals tell you if earth's early atmosphere had little on no free oxygen?
True
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What habitat did the Brachiosaurus live in?
Brachiosaurus lived in Africa and North America from the late Jurassic to the early Cretaceous. The climate was semiarid, with distint wet and dry seasons. The plants were conifers, cycads, tree ferns, and ginkgos. Most of them grew in riparian areas (places near a river or groundwater).
What did Neptunist's believe?
Neptunists believed that rocks were formed by the crystallization of minerals from a primordial sea, rather than by volcanic activity as proposed by their rival theory, the Plutonists. The Neptunist theory was popular in the late 18th and early 19th centuries but was eventually replaced by modern geological theories.
Minerals in old rock suggest that earths early atmosphere had little or no free oxygen?
Yes
Relate the classification og igneous rocks to bowen's reaction series?
The left branch of the Y-shaped arrangement consists of the discontinuous series that begins with olivine at the highest temperature and progresses through pyroxene, amphibole, and biotite as the temperature decreases. This series is discontinuous because the reaction occurs at a fixed temperature at constant pressure wherein the early-formed mineral is converted to a more stable crystal. Each mineral in the series displays a different silicate structure that exhibits increased polymerization as the temperature drops; olivine belongs to the island silicate structure type; pyroxene, the chain; amphibole, the double chain; and biotite, the sheet. On the other hand, the right branch is the continuous reaction series in which plagioclase is continuously reacting with the liquid to form a more albitic phase as the temperature decreases. In both cases, the liquid is consumed in the reaction. When the two reaction series converge at a low temperature, minerals that will not react with the remaining liquid approach eutectic crystallization. Potash feldspar, muscovite, and quartz are crystallized. The phases that are crystallized first are the common minerals that compose basalt or gabbro, like bytownite or labradorite with pyroxene and minor amounts of olivine. Andesite or diorite minerals, such as andesine with either pyroxene or amphibole, crystallize next and are followed by orthoclase and quartz, which are the essential constituents of rhyolite or granite. A basaltic liquid at the top of the Y can descend to the bottom of the series to crystallize quartz only if the earlier reactions are prevented. As demonstrated above, complete reactions between early-formed minerals and the liquid depletes the supply of the liquid, thereby curtailing the progression down the series. One means by which basaltic magma can be transformed to rocks lower in the series is by fractional crystallization. In this process, the early-formed minerals are removed from the liquid by gravity (such minerals as olivine and pyroxene are denser than the liquid from which they crystallized), and so unreacted liquid remains later in the series.
What 2 minerals have had the biggest impact on south Africa's early history?
Gold and diamonds have historically had the biggest impact.
