Mrinal Roy

This study analyzes the depositional regime and textural properties of the sediments from the Shitalakshya River in Bangladesh, enabling us to comprehend how these sediments evolved in a river environment. For this investigation, 30 representative samples were taken from the Shitalakshya River, and their textures were analyzed. The cumulative frequ...

The Baraichari Shale Formation, which is equivalent to the Boka Bil Formation, is well exposed within the Neogene sequence of the Sitapahar Anticline in the Chittagong-Tripura Fold Belt, Bengal Basin, Bangladesh. Regardless of its importance in hydrocarbon accumulation, a comprehensive facies analysis is essential to understand and explain the h...

Eight (8) distinct lithofacies within the fluviatile reach of the Tista River have been recognized by the detailed study of the sediments as exposed along the river bank and river bars. Genetically, the matrix-supported conglomerate (Gms), massive sand (Sm), Trough cross stratified sand (St), planar cross stratified sand (Sp), ripple laminated sand...

The Bhuban Formation of the Surma Group of rocks is well exposed in the Kaptai to Baraichari road cut section, Sitapahar anticline, Kaptai, Chittagong Hill Tracts, Bangladesh. The main goal of the study is to delineate lithosequences, facies association, depositional model and interpret of different sub environment of the sedimentary deposits of th...

The study illustrates the effect of tectonics, climate, and relative sea-level change on the depositional process of the Miocene Bhuban and Boka Bil Formation of Bengal Basin. Outcrop sediments of five transverse sections exposed along the axial zone of Bandarban anticline were studied. Twelve lithofacies such as Gm, Gms, Sm, ST, Sp, Sr, Sl, Sf, Sl...

Arsenic is present in water samples within the studied active floodplain areas of the Tista river, Rangpur Division, Bangladesh. All the water samples contain less arsenic than the WHO prescribed limit of 10 μg/L. 93.33% groundwater samples have higher Mn content than the permissible limit of 0.01 mg/L of WHO. The heavy metal concentrations of wate...

The Tista River is a tributary of the Brahmaputra River. The deposits that exposed along the both banks of the Tista River are characterized mainly by sand, sand laden with gravel and pebble with minor amounts of silt and clay. The X-ray Diffraction (XRD) of the clay sized sediments of the Tista River reveals that illite (and/or mica), chlorite, ka...

The present study deals with the mineralogical composition of the sand deposits of the Jayanti estuary. The sands are composed of quartz (42.09%), feldspar (16.08%), rock fragments (0.79%), mica (4.75%), chlorite (0.75%), heavy minerals (8.45%), matrix (22.17%) and organic matter (4.48%) on an average. The relative abundance of the major minerals a...

The Kapadak River basin in SW Bangladesh lies on late Holocene-Recent alluvium of the Ganges deltaic plain in the north and Ganges estuarine plain in the south. The anion and cation trends in the analyzed shallow-tube well and river water are Cl-> HCO3–>NO3–>SO42- and Na+>K+>Ca2+>Mg2+ respectively. The groundwater of the area is of sodium-calcium c...

The present X-ray diffraction analysis deciphers that the clay sized minerals of the Jayanti estuary are comprised principally of illite in combination with varying amounts of kaolinite, chlorite, quartz and feldspar. The amount of illite is highest in the headward part and lowest in the mouth of the Jayanti estuary. The positive correlation of fel...

The present study analyzes the geochemical composition of sandstone and shale of the Miocene Surma Group to decipher the provenance, tectonic settings and paleoweathering condition of source area in the Bandarban Anticline which is at the western margin of Indo-Burmese Hill Ranges. Statistical empirical index of chemical weathering of the sediments...

The size of the sediment varies from very fine sand to coarser silt. The frequency curves of the most samples are sharp peaked and narrow, indicating that the samples are well sorted to moderately well sorted, while one is moderately sorted. The average percentage of traction population is 2.90%, of saltation population is 71.24% and suspension pop...

The Tista is a Trans-Himalayan river that flows through Sikkim and West Bengal states of India and Rangpur division of Bangladesh and finally falls into the Brahmaputra River. The presence of numerous abandoned channels with various degrees of aggradations indicates large migrations of the Tista River. The pH value of groundwater varies from 6.20 t...

Abstract: The present research work shows role of the anthropogenic activities on the hydrochemistry of the riverwater of the Tista river in its lower where it flows through plain land and finally fall into the Brahmaputra river in Rangpur division, Bangladesh. Field works were performed in the month of July, 2014. Sampling were done in four points...

The X-ray Diffraction (XRD) study of the clay deposits and the cementing materials of sands which are exposed along the Tista River is dominated by the illite (and/or mica), chlorite, kaolinite, quartz and feldspar. The accessory minerals include lavendulan, glauconite lepidolite, enstatite, sekaninaite and ferrierite. Lavendulan is a copper arsena...

Lithofacies analysis of Plio-Pleistocene Dupi Tila Formation exposed along the Chandraghona–Kaptai road-cut (Chitmoron Ghat to Kaptai) section, eastern flank of the Sitapahar anticline has been done to interpret the paleoenvironments of deposition. The Formation comprises the light yellowish to brownish gray, coarse to fine-grained sandstones with...

Abstract—Rajshahi and Nawabgonj district occupies a portion of Barind Tract. Depositional environment and neo-tectonics of the area analyzed with the help of bore log data. About 80 no of bore logs were collected from BMDA and BWDB. Subsurface geological condition, their architectural elements as well as depositional environment was derived from th...

The sediments deposited in the Tista River basin are characterized by the dominance of sand particles mixed with pebbles. The present study reveals that the grain size decreases to the downstream direction. The mean grain size ranges from 0.95 to 3.62. The sands are occasionally laden with the coarser particles mostly with cobbles and pebbles of di...

The Pliocene-Pleistocene Dupi Tila Formation of the Bengal basin is composed of yellow, light brown, and pink, coarse to very fine-grained, moderately hard to loose sandstone, siltstone, silty clay, mudstone and shale with some pebble beds. These syn-orogenic sediments crop out in northern (foothills of Garo hills and Shillong Plateau), eastern (Sy...

The upper Siwalik (700-2300 m) Pliocene-Pleistocene deposits of the western Himalayan basins show similarity in petrological and sedimentological characters with the Dupi Tila Formation of the Bengal Basin, Bangladesh (eastern Himalayan basin), which exhibits typical freshwater molassic deposits laid mostly by the ancestral paleo-Brahmaputra. Consi...

Abstract: The X-ray diffraction (XRD) study of the sediments of the Hizla-Gosairhat-Damudya-Burirhat branch of the mighty Meghna estuary reveals the dominance of illite in combination with varying amounts of kaolinite, chlorite, quartz and feldspar. The distribution of clay size minerals varies from mouth to headward part of the investigated branch...

http://www.tulips.tsukuba.ac.jp/mylimedio/dl/page.do?issueid=977320&tocid=100083957&page=3-14

The Dupi Tila Formation is composed of yellow to light brown medium to very fine moderately hard to loose sandstone, siltstone, silty clay, mudstone and shale with some conglomerates with clasts of petrified wood. The lithofacies of matrix supported conglomerate, trough cross bedded conglomerate, massive sandstone, trough cross bedded sandstone, pl...

The present research work deals with the lithofacies analysis along with the sequence stratigraphy of the Dupi Tila Formation, Lalmai Hills, Comilla to infer the depositional environment and paleogeography. The Dupi Tila Formation consists of alternation of yellow to light brown medium to fine grained sandstones and siltstone, grayish black to blui...

The Upper Bhuban Member in the Sitakund anticline, Chittagong, Southeastern Bangladesh is constituted by the light gray, light yellow and greenish gray sandstone and siltstone with dark gray, bluish black and black finely laminated silty shale to shale. The lithofacies of massive sandstone(Sm), turbidite sandstone (ST), flat bedded sandstone-siltst...

The present study aims at determining the quality of groundwater samples from six Shallow Tubewells (STWs), with special emphasis on drinking and agricultural uses in the northern part of Dinajpur District. The physiochemical properties of water samples were analyzed in order to measure its quality and suitability. Physical analyses involved the me...

The petrographic study of the Dupi Tila Sandstone, Lalmai Hills, Comilla reveals the presence of both the detrital and authigenic (chemical) components. Detrital framework grains are sand-sized particles of either monomineralic (i.e., quartz, feldspar, mica, etc.) or polymineralic, i.e., rock fragments. Quartz includes both the mono- and polycrysta...

The occurrence of Arsenic (As) in groundwater is frequently reported and its associated health hazards have been studied in various parts of Bangladesh like Charghat Paurashava. Dug well (groundwater-based options) and rainwater harvesting techniques have been experimentally adopted as alternative water supply options in these areas. In order to as...

The Bhuban and Boka Bill Formation of the Surma Group of rocks are well exposed in the Bandarban anticline, Chittagong Hill Tracts. Litho-statigrphically the Lower Bhuban Member consists of alternation of fine gray to brownish gray massive sandstone with shale, the Middle Bhuban Member of black shale with siltstone, the Upper Bhuban Member of yello...

The Surma group of rocks are well-exposed in the steeper and faulted western flank as well as gentle and wider eastern flank of the asymmetric doubly plunging Sitakund anticline under the Chittagong district from Bariyadhala in the north to Barabkund in the south, which trends regionally in the NNW-SSE directions. Lithostratigraphically, the Bhuban...

The Upper Bhuban Member of the Surma Group is well-exposed in the asymmetric doubly plunging Sitakund anticline from Bariyadhala to Barabkund area of the Sitakund upazilla, Chittagong district. The mineralogical and petrographical studies indicate that sandstones were composed of quartz (42.90%), matrix (31.38%), rock fragments (15.62%), mica (4.88...

The rock sequences of the Sylhet Limestone Formation, Dauki River section, Gwainghat, Sylhet were studied to identify their various petrological units, non-clastic minerals and fossil content. Limestones are of two varieties: crystalline in lower horizon and fossiliferous in upper horizon. The various petrological units identified in the non-elasti...

The Mio-Pliocene Tipam Sandstone Formation is well exposed in the Sitapahar Hill Range in Chittagong Hill Tracts, Bangladesh. Stratigraphically the rock sequence along the Chandraghona to Boraichari road-cut section consists of alteration of yellow to brownish yellow, very fine sandstone, siltstone, silty shale and gray to bluish gray shale with oc...

Eleven facies (St, Sp, Sh, Sr, Sw, Si, Sr, Fsi, Fi, Fm, and Fb) have been identified in a section of the Boka Bil Formation of Bangladesh. These facies have been grouped into three facies associations; (i) sandstone facies association of tidal channel and estuarine environments (SFTE), (ii) heterolithic facies association of tidal flat environments...

The Bhuban Formation along the Hari River section in Sylhet consists predominantly of shale, silty shale and sandy shale with subordinate siltstone, sandstone and conglomerate. Five lithofacies viz. Gm, Sp, Sm, S and F have been identified in the Formation. Numerous well-defined complete and incomplete Bouma sequences were recorded in turbidite san...

The present study on tide, morphology, lithofacies and evolution of the Meghna estuary is confined to its Hizla-Goshairhat-Damudhya-Burirhat (HGDB) branch which represents the relict main channel of the Meghna-Padma river system. Tide in this HGDB branch is semi-diurnal showing daily, monthly and yearly time versus water level asymmetry. This branc...

The Khulna City Corporation (KCC) consists of late Holocene to Recent Alluvium of the Ganges deltaic plain in north and tidal plain in south. The area is composed of sand, silt and clay in various proportions with small amount of coarse sand, which is classified into seven litho-stratigraphic units from base to top. Stratigraphic cross-sections and...

The sequence stratigraphy of the middle Holocene-Recent age of a portion of the Meghna estuary and Ganges delta in the south central part of Bangladesh has been constructed by using exposed sedimentary sequences along an old branch of the Meghna estuary. Seven lithofacies and three parasequences are recognized, the basal tide generated parasequence...

The Mio-Pliocene Dupitila Formation is exposed in its type area in a sub-latitudinal hill range known as Dupitila Hill Range, located at the foothills of the Shillong plateau within Jaintiapur Police Station, Sylhet, Bangladesh. These sediments are exposed at the southern margin of the homoclinal fold that is separated from the Shillong plateau by...

The Bhuban Formation of Lower Miocene Surma Group, exposed along the Hari river section, Jaintiapur, Sylhet. Bangladesh is composed mainly of shale with subordinate silty shale, sandy shale, siltstone and sandstone with occasional conglomerate. A total of ten samples, five from sandstones and five from shale, were analyzed for petrographic study. L...

The Holocene channel and bar complex within the old Chak Rajapur middle bar of the River Padma at Bagha in Rajshahi District exposes a~5 to 6 m fining and thinning up sequence of eight lithofacies. The channel-fill sequence dominates over the bar sequence where trough cross bedded sandstone (St), planar cross bedded sandstone (Sp), ripple cross-lam...

Seven distinct facies within the 25-kilometers estuarine reach of the Hizla-Gosairhat-Damudya-Burirhat branch of the Meghna estuary have been recognized by detail study of inter- and supra-tidal deposits as exposed along the eroding bank sections at 32 locations. Of these facies A and B are inter-tidal, C is episodic, D is tidal marsh, and G is int...

The Khulna City Corporation (KCC) in southwestern Bangladesh lies on the Late Holocene- Recent alluvium of the Ganges deltaic plain in the north and Ganges estuarine plain in the south. Lithologically the area is composed of coarse to very fine sand, silt, silty clay and clay in various porportion upto a depth of 300m. Stratigraphically shows seven...