Morpho-sedimentary records of active tectonics at the Kameng river exit, NE Himalaya

Srivastava, Pradeep; Misra, D. K.

doi:10.1016/j.geomorph.2007.07.019

Cited by 56 publications

(24 citation statements)

References 18 publications

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“…Any error in this would imply an overestimation of age. In the present context, existing evidence suggests that sufficient predepositional zeroing during the fluvial transport of sediment grains occurred (Mukul et al, 2007;Srivastava and Misra, 2008). Fifteen samples from different terraces were collected and are detailed in Table 1.…”

Section: Methodsmentioning

confidence: 93%

“…In the Namche Barwa region of the Eastern Syntaxis Bend (ESB) where the fission track dating of the metamorphic core indicates rapid uplift and exhumation of $30 km during the last 4 Ma (Burg et al, 1997), and where the mountain front has been deforming (Nakata, 1989). Uplifted fluvial terraces, abrupt changes in channel pattern and steep triangular facets suggest tectonic activity along the N-S and NE-SW trending faults in the Lohit and Dibang river valleys in Eastern Himalaya (Misra, 2007;Srivastava and Misra, 2008). However, few studies exist that chronologically constrain geomorphic evolution and examine it in the context of climatic and tectonic activities.…”

Section: Introductionmentioning

confidence: 99%

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Morpho‐sedimentary records at the Brahmaputra River exit, NE Himalaya: climate–tectonic interplay during the Late Pleistocene–Holocene

Srivastava

Bhakuni

Luirei

et al. 2008

J Quaternary Science

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2009. Morpho-sedimentary records at the Brahmaputra River exit, NE Himalaya: climate-tectonic interplay during the Late Pleistocene-Holocene.ABSTRACT: Morphological and sedimentary records at the exit of Brahmaputra River at Pasighat in the NE Himalaya inform about the climate-tectonic interplay during the past ca. 15 ka. The geomorphology of the area comprises (1) fan terrace T 3 , (2) a high-angle fan (3) terrace T 2 , (4) terrace T 1 and (5) a low-angle fan. Geomorphic consideration suggests that the fan terrace T 3 and high-angle fans are the oldest units and were coeval. The low-angle fan is the youngest geomorphic unit. Sedimentological studies and optically stimulated luminescence chronology suggest that (i) fan terrace T 3 formed between 13 and 10.5 ka and comprised multiple events of debris flows separated by the aggradation as channel bars in a braided river environment; (ii) the high-angle fan formed during 15-10 ka and comprises channel bar aggradation in braided river conditions; (iii) terrace T 2 formed during 10-8 ka due to aggradation in a braided channel environment with lesser events of debris flows; (iv) terrace T 1 formed during <7 and 3 ka took place as bars of the braided river. Sudden coarsening of the sediment indicated a tectonic rejuvenation in the provenance region between 7 and 3 ka; and (v) the low-angle fans dated to <3 ka formed due to aggradation in a small tributary joining the Brahmaputra River. This implies a phase when the main channel of the Brahmaputra did not flood regularly and the tributaries were actively aggrading. The sedimentation style and incision of these geomorphic units responded to contemporary climatic changes and uplift in the Siwalik range along the Himalayan Frontal Fault.

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Section: Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Morpho‐sedimentary records at the Brahmaputra River exit, NE Himalaya: climate–tectonic interplay during the Late Pleistocene–Holocene

Srivastava

Bhakuni

Luirei

et al. 2008

J Quaternary Science

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“…The southern limit of Siwalik Hills is almost flat and shows rapid base level changes during the Holocene. However the fast rate of base level change can be explained as a tectonic interaction (Lave and Avouac, 2000;Starkel, 2003;Srivastava and Misra, 2008).…”

Section: Geologymentioning

confidence: 99%

“…The central segment of the Kumaun Lesser Himalaya is seismically very active (Bilham et al, 1998;Bilham and Gaur, 2000;Pollitz et al, 2008). The geomorphic development in the Himalaya is a result of the interaction between climate and tectonics (Molnar, 2003;Starkel, 2003;Srivastava and Misra, 2008). The neotectonic activities in the frontal margin of Kumaun Himalaya are attributed to the formation out of sequence thrusts and erosion leading to isostatic adjustments (Bookhagen et al, 2005;Hodges et al, 2004;Wobus et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Active Faulting and Deformation of Quaternary Landform Sub-Himalaya, India

et al. 2010

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Landforms developed across terrain defining boundary the Main Boundary Thrust (MBT) have imprints of recent tectonic activity. Depositional landforms such as colluvial fan bear signatures of later phases of tectonic activity in the form of faulting of colluvial fan deposits and development of fault scarps. Tectonic geomorphology applied to the MBT zone suggests recent subsurface activity along the MBT and its splay thrusts. Present day tectonic activity of MBT is indicated by ground creeping, thrusting of Lower Siwalik rocks over recent colluvial fan deposit, aligning of series of lakes along splay faults and laterally along a fault, deflected streams, fault scarps and waterfalls. In the present paper we are addressing the tectonic situation in the foothill region of southeastern Kumaun Sub-Himalaya, India based on detailed field work carried out in the region which brought forward some outstanding morphotectonic evidence of neotectonic activities in the MBT zone.

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“…Thirteen uplifted terraces along the Tons river at the northern side of the Tons thrust ( figure 1(b)) have been observed that exhibit an elevation up to 120 m from the present course of the river. The thickness of the incised bedrock indicates neotectonic uplift (Srivastava and Misra 2008) and these fluvial terraces preserve a composite record of regional variation in climate, tectonics and surface processing of sediments . The asymmetric nature of the majority of these terraces and their bedrock examinations in the study area suggest that the terraces are uplifted along the preexisting faults, which have been reactivated perhaps due to neotectonic activities prevalent in the area.…”

Section: Crossing Of Thematic Maps With the Landslide Occurrence Mapmentioning

confidence: 99%

Fuzzy gamma based geomatic modelling for landslide hazard susceptibility in a part of Tons river valley, northwest Himalaya, India

Srivastava

Lakhera

2010

Geomatics, Natural Hazards and Risk

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Himalaya, being an active orogen, is continuously undergoing tectonic activities that pose threats of land stability on the mountains. A large number of mass movement occurrences have been observed in a part of the Tons river valley area. Remote sensing and geographical information system (GIS) based techniques have been used to derive and analyse various parameters and attributes pertinent to the landslide hazards. The GIS based analysis in the present work, incorporating the fuzzy membership values from the existing landslides, has been used for spatial modelling of the parameter maps including geology, slope amount, slope aspect, weathering, erosion, drainage influence, tectonic influence and landuse/land cover for landslide hazard zonation. The model has been used to spatially classify the study area into zones of very high, high, moderate, low and very low landslide hazard zones. Eighty-five percent of the active landslides have been observed to occur in very high and high hazard zones.

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Morpho-sedimentary records of active tectonics at the Kameng river exit, NE Himalaya

Cited by 56 publications

References 18 publications

Morpho‐sedimentary records at the Brahmaputra River exit, NE Himalaya: climate–tectonic interplay during the Late Pleistocene–Holocene

Morpho‐sedimentary records at the Brahmaputra River exit, NE Himalaya: climate–tectonic interplay during the Late Pleistocene–Holocene

Active Faulting and Deformation of Quaternary Landform Sub-Himalaya, India

Fuzzy gamma based geomatic modelling for landslide hazard susceptibility in a part of Tons river valley, northwest Himalaya, India

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