Discussion
Match the magma series in Column 1 to the geological settings in Column 2.
| Column 1 | Column 2 |
|---|---|
| P. Alkaline Series | i. Divergent oceanic margin |
| Q. Shoshonite Series | ii. Oceanic intraplate |
| R. Calc-alkaline Series | iii. Convergent plate margin |
| S. Tholeiitic Series | iv. Convergent plate margin close to back arc |
Answer: B
The correct matching is P-ii; Q-iv; R-iii; S-i.
- Alkaline series magmas, low-degree melts of enriched mantle, typify oceanic intraplate islands such as Hawaii's late stages and the Canaries (ii).
- The shoshonite series is the high-potassium suite found on the far side of mature arcs, close to the back arc (iv).
- The calc-alkaline series is the typical suite of convergent margins, as in the Andes and Japan (iii).
- The tholeiitic series dominates divergent oceanic margins as mid-ocean ridge basalt (i).
Option A sends the tholeiites to the intraplate setting and the alkaline rocks to the ridge, the reverse of the usual pattern, and the remaining options misplace the shoshonites.
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