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P. Srivastava

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S. Vyshnavi , R. Islam , P. Srivastava , D. K. Misra

Abstract

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

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I. B. Singh ¹, U. K. Shukla ², P. Srivastava ¹

Affiliations
1 Department of Geology, Lucknow University, Lucknow - 226007, IN
2 Department of Geology, Kumaun University, Nainital - 263 002, IN

Abstract

Facies architecture and evolutionary history of a point bar complex of exhumed channel on the upland interfluve surface of the Ganga Plain is presented. The point bar complex is made up of four distinctive sequences, each characterized by a specific lithofacies association and grain size, where successive sequence shows decrease in grain size and reduced channel width denoting reduction in the discharge of the channel. The top of each sequence represents a hiatus surface marked by dense bioturbation. The flow in the exhumed channel was towards south and southwest. At the end of the deposition of third sequence neotectonic activity caused uplift, tilting of the surface and disruption of the river channel. A facies model of such deposits is proposed.

Keywords

Point Bar Complex, Fluvial, Ganga Plain, Palaeocurrent, Indo-Gangetic Alluvium.

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D. Mridula ¹, C. P. Mishra ², P. Srivastava ³

Affiliations
1 Central Institute of Post Harvest Engineering & Technology, Ludhiana, IN
2 Dept. of PSM, IMS, Banaras Hindu University, Varanasi, IN
3 Dept. of Home Science, Banaras Hindu University, Varanasi, IN

Abstract

Morbidity and mortality amongst infants and young children are closely associated with the environment in which they live. Inadequate food, exposure to infection and lack of elementary hygiene and care pose hazards, which the young child is unable to cope with.

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