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指標礦物

指标矿物是用于在地质中确定岩石经历的变质作用。根据原岩(母岩)的原始组成以及所经历的压力和温度,固态矿物之间的化学反应会产生新的矿物。当在变质岩中发现指标矿物时,它表示原矿形成该矿物必须达到的最低压力和温度。岩石形成的压力和温度越高,岩石的变质等级越高。

这个概念的起源可以追溯到1912年,当时乔治·巴罗绘制了苏格兰南部变质带的地图。每个区域均以其中出现的指标矿物命名。如绿泥石带以绿泥石命名。

矿物学带

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泥岩是一种细颗粒的沉积岩,通常含有富含的矿物,经低级至高级变质后会产生这些矿物: [1]

  • 绿泥石带:石英、绿泥石、白云母,钠长石
  • 黑云母带:石英、白云母、黑云母、绿泥石、钠长石
  • 石榴石带:石英、白云母、黑云母、石榴石、钠长石
  • 十字石带:石英、白云母、黑云母、石榴石、十字石、斜长石
  • 蓝晶石带:石英、白云母、黑云母、石榴石、蓝晶石、斜长石(十字石)
  • 硅线石带:石英、白云母、黑云母、石榴石、硅线石、斜长石

另见

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参考文献

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  1. ^ Blatt, Harvey and Robert J. Tracy, Petrology, Freeman, 1996, 2nd ed., p. 375 ISBN 0-7167-2438-3
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指標礦物
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