什么不透明的钢圈上黑云母在火山岩的意思吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 08 - t19:52:43z //www.hoelymoley.com/feeds/question/18030 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/18030 2 什么不透明的钢圈上黑云母在火山岩的意思吗? 主任Muharrem• //www.hoelymoley.com/users/15195 2019 - 09 - 19 - t20:44:34z 2019 - 09 - 20 - t07:04:10z < p > < a href = " https://i.stack.imgur.com/6lkiw.jpg " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/6lkiw.jpg " alt = "在这里输入图像描述" > < / >在火山地区,岩石学的我有了两个样品。其中一个有黑云母广泛opacitic钢圈。另一个黑云母样品没有这个属性。它们有相同的模态矿物的内容。是什么让的区别?< / p > //www.hoelymoley.com/questions/18030/-/18032 # 18032 1 Gimelist回答的什么不透明的钢圈上黑云母在火山岩的意思吗? Gimelist //www.hoelymoley.com/users/725 2019 - 09 - 20 - t07:03:34z 2019 - 09 - 20 - t07:03:34z < p >有几个选项。< / p >
  1. During decompression, biotite is no longer stable and the hydrogen volatilises, leaving behind fine-grained intergrowth of oxide and silicate minerals.
  2. Oxidation of the rims during exposure of the lava to the atmosphere. Higher Fe3+ contents would make the biotite darker.

It is impossible to tell without a detailed electron microscopy analysis. However, my guess it that it is option 1.
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