The upper mantle has nearly uniform bulk chemical composition. At the top of the
ID: 158866 • Letter: T
Question
The upper mantle has nearly uniform bulk chemical composition. At the top of the mantle, the mineral assemblage is olivine and two pyroxenes. With increasing depth, a greater proportion o the mantle is garnet with a decreasing fraction of pyroxene. Which pyroxene component wi e stable to greatest depth before being fully incorporated in garnet? The Continuous Series of Bowen's Reaction Series is composed of minerals with different chemical compositions but the same mineral structures. with different chemical compositions and different mineral structures. with similar chemical compositions and different mineral structures. with similar chemical compositions and similar mineral structures. None of these. A granite hand sample contains well-formed crystals of biotite, plagioclase, and potassium feldspar, but small, irregularly shaped quartz crystals. Why are all the quartz crystals small? Quartz is harder than the other minerals. Quartz is crystallized last from the magma. Quartz crystallized at the highest temperature. Quartz is less stable than the other minerals.Explanation / Answer
4)
Ans: B
The stable componet of pyroxene sholud have iron (Fe) component. Hence ferrosilite is the stable mineral component with increasing depth.
5)
Ans: A
The most amount garnet should present in the Mg.
6)
Ans: B
The continuous Series of Bown's Reaction Series is composed of a solid solution series generally form a continuous reaction series. The plagioclase felspars with end members anorthite and albite , exhibit such a reaction.With falling temprature there is a continuous reaction between the melt and precipitated crystals and thus the composition of crystals is continuously being changed. Such a solid solution series in which the variation in composition is perfectly continuous is called continuous series.
7)
Ans: A
The quartz is the hardest mineral compared to the all minerals in the granite, and the formation of quartz in the rocks is last (priority order).It fills the the remaining small spaces in the crystal rock.
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