Browsing by Author "Joshi, Prabha"
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Item Characterization of municipal solid waste(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VIItem Composting(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VIItem Dams(AIKTC, 2016-07-19) Joshi, PrabhaA dam is a structure which prevents the flow of water and accumulates it in a reservoir.Item Disinfection of water(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VIItem Distribution System: Water Distribution Systems, Types & Methods(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VIItem Earthquake: Earthquake waves, construction and working of seismograph, Earthquake zones of India, elastic rebound theory Preventive measures for structures constructed in Earthquake prone areas(AIKTC, 2016-07-19) Joshi, PrabhaAn earthquake (also known as a quake, tremor or temblor) is the result of a sudden release of energy in the Earth’s Crust that creates seismic waves. The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. When the epicentre of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.Item Fluid inclusion and geochemical signatures of the talc deposits in Kanda area, Kumaun, India: implications for genesis of carbonate hosted talc deposits in Lesser Himalaya(Springer, 2015-06) Joshi, PrabhaTalc deposits in the Deoban Formation of inner Lesser Himalaya in Kumaun are interpreted to have resulted from low-grade, regional burial metamorphism of the siliceous magnesium bearing carbonates consisting of magnesite and dolomite. These deposits are distributed over a large area, occurring in association with magnesite and rarely with dolomite. They are found as fine-grained, fibrous aggregates of talc restricted to small, irregular patches or pockets in carbonate host rocks. Their petrographic features represent different phases of reactions between magnesite and silica to produce talc, thus equilibrium conditions were attained by the assemblage of magnesite + quartz + talc. Scanning electron microscopy also demonstrates that magnesite has reaction margins, whereas dolomite has perfect grain boundary in the magnesite–dolomite–talc assemblage. The major and trace elements in magnesite/dolomite and talc rule out the possibility of any incursion of foreign material during talc formation. Early fluids in magnesite and dolomite were H2O + NaCl + KCl ± MgCl2 ± CaCl2 in composition, their microthermometry data suggest mixing of the fluids. The fluid inclusion studies also imply that talc was formed under the condition of very low XCO2XCO2. A peak temperature of 300–340 °C and pressure of 2–2.2 kbar are estimated from the coexisting immiscible fluids in talc–magnesite assemblage. It is attributed that the estimated PTXCO2XCO2 conditions in the Upper Proterozoic Deoban carbonate rocks, favored the talc formation from magnesite + quartz, and were not conducive to convert siliceous dolomite to talc on a large scale. Keywords Talc Magnesite Fluid inclusions Lesser HimalayaItem Fluid Inclusions in the Ca-Mg Carbonates in Kumaun lesser Himalaya and Focus on the Basin Fluid System(Indian Institute of Technology Bombay, 2016-11-25) Joshi, PrabhaThe Ca-Mg carbonate rocks of the Deoban - Formation in Kumaun Lesser Himalaya have been extensively studied for field, petrography, and geochemical characters whereby the dolomitization after calcite precursor is well established. Many microlithotypes are identified in them, which are fine grained and preserve the original organic and inorganic fabric. Lack of substantial compaction is evident by the fenestral structure (Fig.1). Polygonal mud cracks and parallel lamination in these carbonates signify their exposure as well as deposition in a quiet, shallow marine tidal flat environment. The studies of the fluid evolved in these carbonates and circulated in the basin have not been comprehensive. Present study aims to understand ,the basinal fluids contributed in the formation of various lithofacies from limestone-dolomite-magnesite to talc. In the present work representative samples from Jhiroli area in, Kumaun Lesser Himalaya have been studied.Item Folds, faults and other records of rock deformation(AIKTC, 2016-07) Joshi, PrabhaItem Genetic issues of some of the non metallic minerals in lesser Himalaya(Iranian Journal of Earth Sciences, 2010) Joshi, PrabhaA brief account of the representative and workable industrial minerals namely magnesite, talc and barite in Lesser Himalaya, is presented here emphasizing their genesis. Deposits of magnesite and talc are found associated with Neoproterozoic, plateform type, shelf-slope limestone-dolomite host rocks from inner Lesser Himalayan sequences. Field, textural, geochemical signatures and fluid inclusions trapped in dolomite and magnesite reveal within basin processes, in an increased burial- diagenetic environment responsible for formation of magnesite replacing dolomite. Talc is formed at the expense of magnesite and silica, and with limited dolomite involvement at transition conditions from diagenetic to metamorphism. Barite deposit is hosted within Neoproterozoic Nagthat quartzite rocks of outer genetic understanding.Item Geological investigation & landslide risk assessment of a section near kharpada village along mumbai-goa highway(AIKTC, 2019-05) Joshi, Prabha; Khan, Fathima Israr (15CE01); Maddarki, Tahmeena Abbas Ali (15CE03)The rocks exposed in the area are compact Basalt belonging to the most famous basaltic lava flows known as Deccan Trap. These rocks are prone to weathering due to presence of cooling joints which are the discontinuities along which water penetrates and expose the fresh rock to alteration. Different degrees of alteration due to weathering, formation of soils and failure due to complex geological conditions together with high-intensity rain fall makes the Basalt prone to landslide. A section near Kharpada Village along the Mumbai- Goa Highway selected for Geological investigation and Landslide risk assessment, show presence of 3 set of joints. The joint set identified as J1, J2 and J3 are striking in the NE-SW, NW-SE and N-S direction respectively. The joint set J1 and J2 are near vertical whereas J3 is perfectly horizontal. These joints have divided the rock into blocks of varying size and altered it to varying degree depending upon the frequency and openness of joints. Kinematic analysis of the slope has revealed that the right-hand side slope of the road from spot no 1-7 and 17-10 is susceptible to wedge failure as the sliding surface daylight in the slope face. The vulnerability to slide along these spots have also increased due to highly weathered nature of the rock. The spot no 8-16 show stable slope as the sliding surface does not daylight in the slope face and the rock has not suffered weathering forming it a stable slope. This study reveals the importance of structural geology and kinematic analysis in slope stability analysis and if incorporated in designing of slope it can prevent loss of lives and property by slope failure.Item Geology: Branches & Importance of Civil Engineering(AIKTC, 2016-07-19) Joshi, PrabhaGeology: (From Greek, Geo- Earth. Logos- Science) is the science that deals with the study of the Earth as a planet. It includes scientific studies dealing with origin, age and structure of the earth and gives insight in to the history of the earth as it provides primary evidence for Plate tectonic and past climate.Item Glacial processes and landforms(AIKTC, 2016-07-19) Joshi, PrabhaGlaciers form whenever snowfall exceeds snowmelt (ablation) year after year. The snow accumulates incrementally, pressure increases, and it is changed into névé and then ice by this pressure.Item Ground water(AIKTC, 2016-07) Joshi, PrabhaSources, zones, water table, unconfined and Perched water tables. Factors controlling water bearing capacity of rocks, Pervious and Impervious rocks, Cone of depression and its use in Civil engineering. Geological work of groundwater, Artesian well.Item Hazardous waste(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VIItem Igneous petrology(AIKTC, 2016-07-19) Joshi, PrabhaStudy of igneous, rocks, distinguishing properties among these rocks to identify them in fields.Item Internal structure of the earth and plate tectonics(AIKTC, 2016-07-19) Joshi, PrabhaItem Land Slides(AIKTC, 2016-07-19) Joshi, PrabhaTypes, causes and preventive measures for landslides, Landslides in Deccan region.Item Landforms by wind: Geological work of wind(AIKTC, 2016-07-19) Joshi, PrabhaWind is an effective agent of erosion, transportation and deposition in desert regions.Wind also moves loose sediment in a variety of other environments.Item Leachate management: Incineration and gasification(AIKTC, 2017-08-08) Joshi, PrabhaeCourseware material like PPT Presentation, Lecture Notes, Video, Question Bank, etc for Environmental Engineering - I, Sem VI