Late Quaternary evolution of Tista River terraces in Darjeeling-Sikkim-Tibet wedge: Implications to climate and tectonics
作者： Atul K. Singh , Jitendra K. Pattanaik , Gagan , Manoj K. Jaiswal
DOI: 10.1016/J.QUAINT.2016.10.004
关键词:
摘要: Abstract Terraces in the Himalayas are important geomorphic archives which preserve signature of tectonics and past environment. eastern part Himalayan fold thrust belt have not received much attention geologists. A geochemical approach using luminescence dating has been applied to understand evolution paired deformed terraces between major boundaries Himalayas, on either banks Tista River Darjeeling-Sikkim-Tibet wedge. These located at confluence Tum Thang khola River. Three levels present general also study area. The terrace T3 was formed during last interglacial period T2 glacial maximum (LGM) humid phases after LGM. top section (∼2.5 m thick) transition phase (arid humid) Younger Dryas event. region experienced several deformational events, (i) one 45 ka raised its level, (ii) another 11.9 level this event is associated with shifting khola, (iii) still tectonically active as shown by warping T1 T0 surfaces, recent origin. complex input sediments from Higher Crystalline (HHC) rocks locally Lingtse granites.
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