Optically stimulated luminescence chronology of terrace sediments of Siang River,Higher NE Himalaya: Comparison of Quartz and Feldspar chronometers |
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| Authors: | Pradeep Srivastava D K Misra |
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| Institution: | 1.Wadia Institute of Himalayan Geology,Dehradun,India |
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| Abstract: | Four levels of terraces located along Siang River, north of Main Central Thrust at Tuting, NE Himalaya are dated using Optically
Stimulated Luminescence (OSL). The dating technique is applied using (1) Blue LED stimulation on Quartz (2) Infrared Stimulated
Luminescence (IRSL) stimulation on Feldspar at 50 °C and (3) Infrared Stimulated Luminescence stimulation on Feldspar at an
elevated temperature of 225 °C. The results indicated that the later two protocols on feldspars yielded overestimated ages
that suggested incomplete bleaching of luminescence signals in feldspar. The ages derived using quartz suggested a nearly
continued valley aggradation from >21–8 ka with three phases of bedrock incision. The phase of aggradation coincides with
a climatic transition from cold and dry Last Glacial phase to warm and wet Holocene Optimum. The bedrock incision phases centered
at <21 ka, ∼11 ka and ∼8 ka indicate towards major episodes of tectonic uplift in the region around Tuting. |
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