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Shivam Sharma posted an Question
September 03, 2020 • 21:38 pm 30 points
  • CSIR NET
  • Earth Sciences

Ii) name the species of plagioclase with a chemical composition of anabg (3) name the type of plagioclase compositional zoning indicated in diagrams (i), (ii) a

ii) Name the species of plagioclase with a chemical composition of AnAbg (3) Name the type of plagioclase compositional zoning indicated in diagrams (i), (ii) and ii). Xa Mole fraction of anorthite in plagioclase. The arrow indicates the direction of increasing AAn (9) Plagioclase ii) Fagioclase Fagiociase Core Rim Core Rim Core- Rim (ii) (11)

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    Rahul kumar

    Dear student, you haven't marked this question as answered. Kindly do that. Ask me if you still have any further queries.

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    Sajan sarthak best-answer

    for second case i. X An is more as we go from core to rim so reversed. ii .oscillatory as mix up of An and Ab iii .normal zoning as An content decreasing as core to rim

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    Rahul kumar

    Andesine; An40Ab60 (Means Anorthite 40% and Albite 60%) is known as Andesine (A variety of plagioclase) (i) Reverse zoning Xan (mole fraction of Anorthite is increasing towards the rim) (ii) Oscillatory zoning (iii) Normal zoning (Xan is decreasing towards the rim)

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