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Misra, D. K.
- Tectono-Stratigraphic Framework of the Eastern Syntaxis, Arunachal Pradesh, India
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Himalayan Geology, Vol 34, No 1 (2013), Pagination: 49-56Abstract
The Eastern Syntaxis of the Arunachal Himalaya is built up of Proterozoic to Cenozoic rocks, which occur in the form of eight distinct thrust bound litho-tectonic units. From SW to NE, in ascending structural order they are: the Siwalik Group, the Gondwana Group, the Yinkiong Group, the Miri Group, the Bomdila Group, the Sela Group, the Tidding Fom1ation and the Lohit Plutonic Complex. The Sub-Himalayan Zone (Siwalik Group) overrides the Brahmaputra Alluvium along the Himalayan Frontal Thrust (I IFT) and is over thrust by the rocks of the Lesser Himalaya (Gondwana, Yinkiong, Miri and Bomdila groups) along the Main Boundary Thrust (MBT). The Yinkiong Group is exposed along the central part of the syntaxis in the form of a tectonic window beneath the Miri Group, which wraps around it. High-grade metamorphics of the Central Crystalline Complex of the Higher Himalayan Zone (Sela Group) overlay the Bomdila Group along the Main Central Thrust (MCT) and is over thrust by the rocks of the Tidding Formation of Trans Himalaya along the Tidding thrust. The Lohit Plutonic Complex is of batholithic dimension and has been thrust over the rocks of the Tidding Formation along the Lohit Thrust. The Tidding suture is the southeastern extension of the Indus-Tsangpo suture zone. The Lohit plutonie complex is the southeastern extension of the Ladakh batholith.Keywords
Eastern Syntaxis, Siang Valley, Tectono-stratigraphy, Arunachal Pradesh, Eastern Himalaya
- Elemental Behaviour in the Soil Profile of the Humid Northeastern Himalaya
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Himalayan Geology, Vol 34, No 1 (2013), Pagination: 65-75Abstract
Soil profiles are generally developed on stable landform in an erosion limited area with the interaction of water (rainfall). The development of the soil profile on granodioritic lithology at Anini village of Arunachal Pradesh, at an altitude of 1644 m in the NE Himalaya provides us some opportunity to understand the elemental behavior in the highly eroded and humid region, where rainfall is as high as ~2600 mm/a. The study area is geodynamically active resulting in many landslides and other mass movements. Therefore, physical and chemical weathering processes, have played a major role in its geomorphic development. The exposed least altered rock is noted with high features indicating the play of tectonics (physical weathering), which further promotes chemical weathering due to water-rock interaction substantiated by the increase of loss of ignition (Lo1) percentage from least altered rock to regolith. Due to rain water interaction, the profile shows the change of pH from alkaline to acidic, i.e., from least altered rock (pl-l-9) to regolith (pH-5). Depletion of major oxides such as SiO,, MgO, CaO, Na,O, P20, and enhancement of TiO,, Al,O_ Fe2O, l(,O are noticed in the profile. Continuous enhancement of chemical index of alteration (CIA) is observed from least altered rock to regolith (56-85) with the progression of weathering. Chemical index of alteration (CIA), chemical index of weathering (CIW) and plagioclase index of alteration (PIA) of soil profile show identical behaviour in sap rock and saprolith, however during the advancement of weathering, the leaching of Ko resulted in deviation of CIW and PIA value from CIA parameter. Trace elements show enrichment from least altered rock to regolith (except Sr). The study infers that the variable geochemical proxies in soil profile are resultant of high precipitation in the tectonically active northeastern Himalaya.Keywords
Soil Profile, Northeastern Himalaya, Geochemical Proxies, Climate-tectonic Interaction- Active Faults of the Eastern Syntaxial Bend, Arunachal Pradesh, India
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Himalayan Geology, Vol 33, No 2 (2012), Pagination: 146-150Abstract
Field studies in the last one decade coupled with interpretation of topographic maps resulted in identification and delineation of a large number of NNW-SSE to WNW-ESE, N-S, NNE-SSW to NE-SW and E-W trending active faults which post-date the 'boundary thrusts' that define the boundaries of lithotectonic terranes and shear zones. Recent movements on the faults have caused not only pronounced deflection of rivers and streams but also formed loops and present-day ponding. Movements along faults are also responsible for abrupt rise of mountain front, occurrence of a planar scarp and triangular facets devoid of gullies or with a few straight furrows, huge landslides, debris fan, abrupt narrowing down of wide meandering rivers and uplifted fluvial terraces.Keywords
Siang Valley, Stream Deflection, Stream Incision, Stream Ponding, Fluvial Terraces, Himalaya- Evolution and Resetting of the Fluids in Manikaran Quartzite, Himachal Pradesh: Application to Burial and Recrystallization
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Authors
Rajesh Sharma
1,
D. K. Misra
1
Affiliations
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 6 (1998), Pagination: 785-792Abstract
Primary aqueous fluid inclusions trapped in Manikaran Quartzite suggest a depth of burial about 4 to 7 km and entrapment temperature from 67 to 146°C. The later thrust-related recrystallization occurred in H2O-CO2 fluid regime under greenschist facies conditions. This event also resulted in thermal resetting of some aqueous inclusions trapped in original grains.Keywords
Fluid Inclusion, Burial Metamorphism, Himachal Pradesh.
- Litho-Tectonic Sequence and their Regional Correlation Along the Lohit and Dibang Valleys, Eastern Arunachal Pradesh
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Affiliations
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 2 (2009), Pagination: 213-219Abstract
Geological mapping between Lohit and Dibang valleys of eastern Arunachal Pradesh reveals the existence of five thrust bound tectonostratigraphic units. In ascending structural order from SW to NE these are: (1) Sewak Group, (2) Lalpani Group, (3) Mayodiya Group, (4) Tidding Formation and (5) Lohit plutonic complex. This differs from previous mapping, because the three tectonostratigraphic units (Sewak, Lalpani and Mayodiya) were grouped under a single unit, referred as the Mishmi crystallines. The low-grade metamorphics of the Sewak Group occur at two different tectonic levels, one as persistent belt in the foothills and the other in the tectonic window beneath the high-grade metamorphics of the Mayodiya thrust sheet in the Higher Himalaya. The Tidding suture is the southeastern extension of the Indus-Tsangpo suture zone.Keywords
Lohit Valley, Dibang Valley, Thrust, Arunachal Pradesh, Himalaya.- Optically Stimulated Luminescence Chronology of Terrace Sediments of Siang River, Higher NE Himalaya: Comparison of Quartz and Feldspar Chronometers
Abstract Views :207 |
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
1 Wadia Institute of Himalayan Geology, Dehradun - 248 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 3 (2012), Pagination: 252-258Abstract
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.Keywords
Optically Stimulated Luminescence Dating, Siang River, Terraces, NE Himalaya.References
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