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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
January 08, 2021 • 00:21 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Given b & d i marked a & c
31 Which of the following statement(s) is/are correct for a plot of ("Sr/6Sr) versus ("Rb/Sr) of a rock which has evolved in a closed system? (A) The slopes of the lines of evolution for the minerals in the rock are all equal and positive B) The slopes of the lines of evolution for the minerals in the rock are all equal and negative (C) The slope of the isochron is identical in direction to the slope of the lines of evolution for the minerals in the rock (D) The slope of the isochron is opposite in direction to the slope of the lines of evolution for the minerals in the rock
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Rahul kumar Best Answer
Correct answer should be b and d See the attached figure below. In left image; A, B, C are minerals; line AC and A'C' are isochrones. You can note that slope of isochrone is positive. You can also observe the evolution path of Isotopes in mineral. Evolution paths (A-->A'; B-->B' and C-->C') are showing negative but equal (parallel). So, option B and D are correct.