Question:
The response of mineral assemblages to decreasing temperature and pressure is observed in
The response of mineral assemblages to decreasing temperature and pressure is observed in
Show Hint
Metamorphism is the change of mineral assemblages in a rock in response to changing temperature, pressure and fluids. The direction of the temperature and pressure change gives the process its name.
Updated On: Jun 16, 2026
- Retrograde metamorphism
- Metasomatic metamorphism
- Hydrothermal metamorphism
- Poly metamorphism
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
Metamorphism is the change of mineral assemblages in a rock in response to changing temperature, pressure and fluids. The direction of the temperature and pressure change gives the process its name.
Step 1:
Distinguish the types. Metasomatic metamorphism involves a change in bulk chemistry by fluid-driven addition or removal of elements, hydrothermal metamorphism is alteration by hot circulating fluids, and poly metamorphism means a rock has undergone more than one separate metamorphic event.
Step 2:
When temperature and pressure decrease, the existing high-grade minerals become unstable and convert back toward lower-grade minerals. This re-equilibration to falling temperature and pressure is exactly what defines retrograde metamorphism.
Answer: Option (1) — Retrograde metamorphism.
Metamorphism is the change of mineral assemblages in a rock in response to changing temperature, pressure and fluids. The direction of the temperature and pressure change gives the process its name.
Step 1:
Distinguish the types. Metasomatic metamorphism involves a change in bulk chemistry by fluid-driven addition or removal of elements, hydrothermal metamorphism is alteration by hot circulating fluids, and poly metamorphism means a rock has undergone more than one separate metamorphic event.
Step 2:
When temperature and pressure decrease, the existing high-grade minerals become unstable and convert back toward lower-grade minerals. This re-equilibration to falling temperature and pressure is exactly what defines retrograde metamorphism.
Answer: Option (1) — Retrograde metamorphism.
Was this answer helpful?
0
0
Top TS PGECET Geo Engineering and Geo Informatics Questions
- In which of the following stages of a river are meanders formed commonly?
- An elongated sandy deposit that extends out into open water in the direction of a longshore current is called:
- Size of the landform on the surface of the Earth is:
- The point bars which form in the concave side of meanders of large rivers consist of:
- Which of the following is not a basic aspect of applied geomorphology?
View More Questions
Top TS PGECET Minerals and Rocks Questions
- Which of the following is the cleavage of Galena mineral?
- The luster and crystal system of a Topaz mineral respectively are:
- The diaphaneity of Gypsum mineral is:
- Which portion of the spherical projection does a mineralogist use for crystallographic analysis?
- The ratio of silicon to oxygen in pyroxenes is:
View More Questions
Top TS PGECET Questions
- If \( P = \begin{pmatrix} 1 & 1 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 1 \end{pmatrix} \) is the modal matrix of \( A = \begin{pmatrix} 1 & 1 & 0 \\ 0 & 2 & 2 \\ 0 & 0 & 3 \end{pmatrix} \) then the sum of all the elements of \( P^{-1}AP \) is
- If the system of equations \( kx + y + z = k - 1 \), \( x + ky + z = k - 1 \), and \( x + y + kz = k - 1 \) has infinite solutions, then \( k \) is
- The value of the integral \( \int_C (2xy - x^2) \, dx + (x^2 + y^2) \, dy \) where \( C \) is the boundary of the region enclosed by \( y = x^2 \) and \( y^2 = x \), described in the positive sense, is
- Let \( f(x) = \log x \). The number \( C \) strictly between \( e^2 \) and \( e^3 \) such that its reciprocal is equal to \( \frac{f(e^3) - f(e^2)}{e^3 - e^2} \) is
- The solution of the differential equation \( (D^2 + 2)y = x^2 \) is
View More Questions