Question:
Which one of the metamorphic facies sequence in order of increasing metamorphic grade defines thermal metamorphism ?
Which one of the metamorphic facies sequence in order of increasing metamorphic grade defines thermal metamorphism ?
Updated On: Feb 10, 2025
- Sanidinite → pyroxene hornfels → hornblende hornfels → albite-epidote hornfels
- Albite-epidote hornfels → hornblende hornfels → sanidinite → pyroxene hornfels
- Hornblende hornfels → albite-epidote hornfels → pyroxene hornfels → sanidinite
- Albite-epidote hornfels → hornblende hornfels → pyroxene hornfels → sanidinite
Hide Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Thermal Metamorphism and Increasing Metamorphic Grade
Understanding the Metamorphic Sequence
Thermal metamorphism progresses in a sequence from **lower-grade facies** to **higher-grade facies** as temperature increases. The correct sequence based on increasing metamorphic grade is:
- Albite-epidote hornfels: Represents the lowest-grade thermal metamorphism.
- Hornblende hornfels: Forms at moderate temperatures due to further heating.
- Pyroxene hornfels: Develops at high-temperature conditions.
- Sanidinite: The highest-grade thermal metamorphic facies, formed under extreme heat.
Step 1: Arranging the Sequence
The correct order of thermal metamorphism facies is:
\[ \mathbf{Albite\text{-}epidote\ hornfels \rightarrow Hornblende\ hornfels \rightarrow Pyroxene\ hornfels \rightarrow Sanidinite} \]
Final Answer:
Thus, the correct option is: (D).
Was this answer helpful?
0
0
Top Questions on Petrology
- In the given isobaric binary temperature-composition (T-X) phase diagram involving solids A and B, the fraction of melt remaining at point Q for a magma having initial composition P will be _______. (Round off to one decimal place)
- Clinopyroxene crystallizing from a basaltic magma has Sm concentration of 24 ppm. If the clinopyroxene-melt partition coefficient for Sm is 1.2, the concentration of Sm in the basaltic magma will be ______ ppm. (In integer)
- Consider the univariant metamorphic reaction Albite = Jadeite + Quartz. The minimum number of chemical components required to describe the composition of all the phases is _________ . (In integer)
- For the given Barrovian metamorphic sequence, which of the following statements are correct?
- Which of the following statements on mantle partial melting are correct?
View More Questions
Questions Asked in IIT JAM GG exam
- Match the minerals in Group I with their highest order of interference color in Group II (for 0.03 mm mineral thickness).
Group I Group II P. Sillimanite 1. First order Q. Quartz 2. Second order R. Muscovite 3. Greater than third order S. Calcite 4. Third order variegated - IIT JAM GG - 2024
- Mineralogy
- An orebody contains pyrite and chalcopyrite in the same molar proportions. The percentage concentration of Cu in the ore will be ________. (Round off to the nearest integer) (Use atomic weight, in g/mol, of Cu = 63.55, Fe = 55.85, S = 32.06)
- IIT JAM GG - 2024
- Mineralogy
- For an anisotropic crystal of thickness 0.04 mm and refractive indices of 1.636 and 1.486 along the slow and fast directions, respectively, the retardation produced is ______ nm. (In integer)
- IIT JAM GG - 2024
- Mineralogy
- A rock element during deformation, experienced a pressure change of $5×10^4 N/m^2$, due to which its volume changed from 4 cm3 to 3.9 cm3. The bulk modulus of the rock is ________ ×$10^6 N/m^2$. (In integer)
- IIT JAM GG - 2024
- Applied Geology
- A partially saturated soil sample has a volume of 1200 cc. The volume of water present in the sample is 300 cc. The mass of solid in the sample is 1908 g and the particle density is 2.65 g/cc. The porosity (n) of the soil sample is _______ %. (In integer)
- IIT JAM GG - 2024
- Applied Geology
View More Questions