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DAILY NEWS ANALYSIS
06 May, 2020
5 Min Read
Part of: GS-I- Geography (PT-MAINS-PERSONALITY TEST)
Scientists and students from the Wadia Institute of Himalayan Geology (WIHG) have explored the Zanskar catchment area. The study was conducted to understand the landform evolution in transitional climatic zones, using morphostratigraphy, Optically Stimulated Luminescence (OSL) dating and provenance analysis of landforms like valley fill terraces and alluvial fans.
Valley Fill Terrace: The fill terrace is created by either a stream or river that starts to incise into the material that it deposited in the valley. Once this occurs benches composed completely of alluvium form on the sides of the valley. The uppermost benches are the fill terraces.
Alluvial Fans: Triangle-shaped deposits of gravel, sand and even smaller pieces of sediment, such as silt.
Note: WHIG is an autonomous institute under the Department of Science & Technology, Government of India.
Morphostratigraphy: The organization of rock or sediment strata into units based on their surface morphology (landforms).
Optically-Stimulated Luminescence: It is a late Quaternary dating technique used to date the last time a quartz sediment was exposed to light. As sediment is transported by wind, water or ice, it is exposed to sunlight and zeroed of any previous luminescence signal.
Provenance Analysis: It aims to determine the source region (provenance) of a sediment sample. It is aimed to reconstruct the parent rock or rocks of sand bodies, the time of deposition of the sand and, if possible, the climate conditions during the formation of the sediments.
Key Findings
Significance
Zanskar River
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Source: PIB
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