The Indus River flows through Ladakh,one of the driest and coldest places on earth,in a tectonically active domain.Fluvial,glaciofluvial,lacustrine and debris dominated sequences represent the Late Quaternary sediment...The Indus River flows through Ladakh,one of the driest and coldest places on earth,in a tectonically active domain.Fluvial,glaciofluvial,lacustrine and debris dominated sequences represent the Late Quaternary sedimentary record along the river course.Karakoram Fault,a major crustal scaled feature reported to be active during the Quaternary,is associated with the Indus River drainage.Linkages between a major,active fault and deposits formed during the activity period of the fault are explored using heavy mineral deduced provenance and Optically Stimulated Luminescence(OSL)chronology.Five deposits in a~200 km long stretch of the Indus River have been examined for a~80 ka period to decipher the climate linked aggradation history.Damming of the Indus River at~79 ka and existence of the Spituk Lake for>30 ka is demonstrated.Using geology of the provenance in relation to the mineralogical attributes of the Quaternary deposits,the major drainage reorganization when the connection of the Tangtse Valley to the Indus was blocked,is inferred at~73 ka.It is supported by the geologicalgeomorphological evidence.The study demonstrates the application of provenance linked mineralogy in terrestrial aggradation in a tectonically active region.展开更多
The fluvio-aeolian sediments in the alluvial plains of NW Haryana and adjoining northern Rajasthan are known to conceal a number of palaeochannels of the erstwhile Saraswati River and its tributaries,which were also t...The fluvio-aeolian sediments in the alluvial plains of NW Haryana and adjoining northern Rajasthan are known to conceal a number of palaeochannels of the erstwhile Saraswati River and its tributaries,which were also the sites for many pre-historic settlements dating back to the pre-Harappan era.Using digital remote sensing techniques like image enhancement,principal component analysis and mineral composite index mapping from Landsat ETM+data,and hydrological routing and stream network generation from DEM.展开更多
基金Council of Scientific&Industrial Research(CSIR)(Sr.No1121020574 and Ref.No:19-12/2010(i)EU-IV)funded a fellowship to RLMinistry of Earth Sciences(MoES)has supported the project(MoES/PAMC/H&C/51/2013-PC-II)
文摘The Indus River flows through Ladakh,one of the driest and coldest places on earth,in a tectonically active domain.Fluvial,glaciofluvial,lacustrine and debris dominated sequences represent the Late Quaternary sedimentary record along the river course.Karakoram Fault,a major crustal scaled feature reported to be active during the Quaternary,is associated with the Indus River drainage.Linkages between a major,active fault and deposits formed during the activity period of the fault are explored using heavy mineral deduced provenance and Optically Stimulated Luminescence(OSL)chronology.Five deposits in a~200 km long stretch of the Indus River have been examined for a~80 ka period to decipher the climate linked aggradation history.Damming of the Indus River at~79 ka and existence of the Spituk Lake for>30 ka is demonstrated.Using geology of the provenance in relation to the mineralogical attributes of the Quaternary deposits,the major drainage reorganization when the connection of the Tangtse Valley to the Indus was blocked,is inferred at~73 ka.It is supported by the geologicalgeomorphological evidence.The study demonstrates the application of provenance linked mineralogy in terrestrial aggradation in a tectonically active region.
文摘The fluvio-aeolian sediments in the alluvial plains of NW Haryana and adjoining northern Rajasthan are known to conceal a number of palaeochannels of the erstwhile Saraswati River and its tributaries,which were also the sites for many pre-historic settlements dating back to the pre-Harappan era.Using digital remote sensing techniques like image enhancement,principal component analysis and mineral composite index mapping from Landsat ETM+data,and hydrological routing and stream network generation from DEM.
