Question:
Match the rock types in Group I with their characteristic mineral assemblages in Group II.Group I Group II P Diorite 1 plagioclase-orthopyroxene clinopyroxene Q Tole 2 olivine-orthopyroxene-clinopyroxene R Norite 3 plagioclase-homblonde + quartz S Lherzolite 4 quarte-plagioclase K-feldspar
Match the rock types in Group I with their characteristic mineral assemblages in Group II.
| Group I | Group II | ||
| P | Diorite | 1 | plagioclase-orthopyroxene clinopyroxene |
| Q | Tole | 2 | olivine-orthopyroxene-clinopyroxene |
| R | Norite | 3 | plagioclase-homblonde + quartz |
| S | Lherzolite | 4 | quarte-plagioclase K-feldspar |
Updated On: Nov 27, 2025
- P4, Q-3, R-2, S-1
- P-2, Q-1,R-3,S-4
- P-3, Q-4, R-1, S-2
- P-1, Q-3, R-4,S-2
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The Correct Option is C
Solution and Explanation
To accurately match the rock types in Group I with their characteristic mineral assemblages in Group II, we need to understand the typical mineral composition associated with each rock type.
- Diorite: Diorite is typically composed of plagioclase feldspar along with hornblende and sometimes quartz. Therefore, the corresponding mineral assemblage in Group II is plagioclase-hornblende + quartz. This matches with option 3.
- Tole: Generally, Tole is not a recognized rock type in geological terms. Given the options, it seems to have been intended as a typographical error or misinterpretation. However, no other option seems to match a common rock from Group I. So, based on typical rock composition, the closest match could be with an assemblage involving feldspars and quartz, though this is a hypothesis to illustrate the importance of clear identification in geology.
- Norite: Norite is characterized by plagioclase along with orthopyroxene and clinopyroxene. This matches with the mineral assemblage containing plagioclase-orthopyroxene-clinopyroxene, which corresponds to option 1.
- Lherzolite: Lherzolite is a type of peridotite, predominantly composed of olivine, orthopyroxene, and clinopyroxene. The corresponding mineral assemblage is olivine-orthopyroxene-clinopyroxene, which matches with option 2.
From the analysis, we find that the correct matching is:
- P (Diorite) - 3: plagioclase-hornblende + quartz
- Q (Tole) - 4: Contains an error in identification, typically rocks such as granites or similar feldspar-rich types include quartz which cannot be determined correctly from given data.
- R (Norite) - 1: plagioclase-orthopyroxene-clinopyroxene
- S (Lherzolite) - 2: olivine-orthopyroxene-clinopyroxene
Therefore, the correct answer is P-3, Q-4, R-1, S-2.
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