最近30从www.hoelymoley.com 2023 - 07 - 08 - t20:36:03z //www.hoelymoley.com/feeds/question/2293 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/2293 12 多瑙河的水手 //www.hoelymoley.com/users/77 2014 - 07 - 28 - t09:11:10z 2014 - 08 - 01 - t10:19:13z

< p >岩浆岩石的稀土元素组成。冰岛vulcanic地区非常活跃,而且,据我所知,完全从岩浆岩建造。< / p > < p >所以不会奇怪如果有大量的稀土元素吗?< / p >这样的存款已经记录了吗?

//www.hoelymoley.com/questions/2293/-/2305 # 2305 7 Gimelist //www.hoelymoley.com/users/725 2014 - 08 - 01 - t10:19:13z 2014 - 08 - 01 - t10:19:13z

< p >简单的答案是否定的。没有任何重要的稀土元素(REE)存款在冰岛。这个问题:< a href = " //www.hoelymoley.com/q/310/725 " >什么是稀土和为什么他们附近集群碱性岩浆作用?< / >给了一系列可能的形成机制。基本上,形成岩浆矿床的稀土元素,简单的岩浆活动是不够的。它必须岩浆活动有关的两个进程(或两者):< / p > < ol > <李>岩浆形成于地幔熔融程度很低。稀土元素是不相容的元素,这意味着它们集中在融化成液体。如果地幔融化程度很低(假设不到1%),里斯都集中在它。一旦融化,REE-rich液体稀释通过进一步REE-poor融化。岩石中形成这一过程,或例子,碳酸盐岩和碱性岩浆。他们不存在于冰岛(如果他们做的,很少)。李李< / > < >岩浆演化和分化。 Let's say we take the REE-poor magma from 1. Now it starts crystallising. Remember that REE are incompatible and will stay in the liquid. So the residual melt eventually gets enriched in the REE. Think salt water being evaporated - the salt remains inside the water making it more saline. Pegmatite is one type of rock that forms in this process. Similarly, it does not occur in Iceland.

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