GATE GG-1 · 2025 · GG
Question 47: Geochemistry
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Question 47
GGMCQ2 marksNeeds review
In a hypothetical scenario, the element Y has 4 stable isotopes
Y,
Y,
Y and
Y. The isotope
Y is radiogenic and is formed by β
decay of the isotope
X of the element X with a half-life of 3.51 billion years. An igneous rock, which has behaved as a closed system, has three different minerals P, Q, and R, which crystallized from the same magma 2 billion years ago, with initial X/Y ratios of 1.75, 2.05, and 0.75, respectively. Which one of the following statements is true for the ratio
Y/
Y in this igneous rock in the present day?Your answerChoose one option.
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2025GG
GATE GG-1 2025 · Paper 1
Geology and Geophysics · Original paper archive
- Section
- Section GG
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
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