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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1
Correct answer has to be (A)..... 2 indicates the tholeiitic trend where you can see the trending is towards fe-enrichment in the given AFM diagram(Alkaline rock series can also exhibit that fe enrichment trend). 1 most probably indicates the calcalkaline trend which are generally related to subduction settings.. And as per AFM diagram, the calcalkaline basalt have a constant ratio of MgO to FeO(MgO/FeO remains constant) . Also note that Calcalkaline basalt have high alumina content (high Al2O3 content). This trend is actually related to the crystal fractionation.