profile-img
Rohinee posted an Question
October 09, 2020 • 22:28 pm 30 points
  • IIT JAM
  • Geology (GG)

Need a detailed answer for this question :/

1 Answer(s) Answer Now
  • 2 Likes
  • 1 Comments
  • 0 Shares
  • comment-profile-img>
    Sajan sarthak best-answer

    Olivine and clinipyroxene both can form so their concentration is decreasing in magma.

    cropped7502064597590335450.jpg
    eduncle-logo-app

    so according to you basically it means that both MgO and CaO are decreasing in content due to the formation of olivines and pyroxenes... and Al2O3 is increasing in content. .. If the question would have been asked that the slope of CaO is not negative instead positive then the answer would have been olivine crystallization along with plagioclase crystallisation... am I right? .. and what exactly is the meaning of suite of "congenetic and coeval" given in the question?

    eduncle-logo-app

    only olivine

    eduncle-logo-app

    PLAGIOCLASE will form if Cao and Al2O3 both are decreasing

    eduncle-logo-app

    co genetic:- same parent. coeval :+ same time

    eduncle-logo-app

    oh okay.... thank you so much :)

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers