Correct Option
The correct option is Red Sea rift.
Explanation
The Indian Plate is a major tectonic plate that includes the Indian subcontinent and a portion of the Indian Ocean. Its boundaries are defined by various tectonic features, including mountain ranges, oceanic ridges, and subduction zones. The western margin specifically delineates the boundary between the Indian Plate and the Arabian/Eurasian plates.
Detailed Analysis
The boundary of the Indian Plate is defined as follows:
- Western Margin: The boundary follows the Kirthar Mountain range of Pakistan. It further extends along the Makrana coast (which is an active subduction zone).
- Connection to Spreading Centre: After extending along the Makrana coast, the boundary joins the spreading centre associated with the Red Sea rift.
- Oceanic Extension: This boundary line continues south-eastward, interacting with the Chagos Archipelago and merging into the mid-ocean ridge system (Carlsberg Ridge) in the Indian Ocean.
The Red Sea rift is a significant divergent boundary where the Arabian Plate is splitting away from the African Plate. The tectonic lines connecting the Makrana coast link geologically to this spreading system.
Key Takeaway
The western boundary of the Indian Plate traces the Kirthar Mountains and the Makrana coast, eventually connecting to the spreading centre of the Red Sea rift.