Coastal Placer Deposits of Central Tamil Nadu, India

Angusamy, N.; Sahayam, J. Dajkumar; Gandhi, M. Suresh; Rajamanickam, G. V.

doi:10.1080/10641190500192102

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…Heavy mineral placer deposits containing variable proportions of ilmenite, magnetite, garnet, zircon, rutile, monazite, tourmaline, staurolite, sillimanite, kyanite, etc. are reported from beaches as well as nearshore areas along the Indian coastline (Siddiquie et al, 1982;Rajamanickam, 1983;Gujar et al, 1988Gujar et al, , 2004Wagle et al, 1989;Gujar, 1995;Angusamy et al, 2005). Under the National programme of Beach Placer Mining Capacity Building (2002-07) an extensive exploration was undertaken along the South Maharashtra Coast, Central West Coast of India (Fig.…”

Section: Introductionmentioning

confidence: 99%

Ilmenite, Magnetite and Chromite Beach Placers from South Maharashtra, Central West Coast of India

et al. 2010

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The heavy mineral placer deposits of the coastal sediments in south Maharashtra stretch for 12.5 km from Pirwadi in the north to Talashil in the south. The area is a sand bar represented by a narrow submergent coastal plain lying between the Achara and Gad Rivers. The sediments in the area are mainly sands which are moderately well sorted to well sorted. The heavy mineral concentration in the surficial sediments ranges between 0.69 and 98.32 wt % (28.73 wt % in average). The heavy mineral concentration shows an increasing trend from north to south. The heavy mineral suite consists predominantly of opaque minerals (ilmenite, magnetite and chromite), garnet, pyroxene, amphibole, zircon, tourmaline, rutile, staurolite, etc. Ilmenite grains are fresh whereas magnetite grains show the effect of weathering and alteration. The chromite grains are rounded to sub-rounded with alteration at the margin of the grains. The surficial textures of the opaque minerals show mechanical breaking that indicates limited distance of transportation.Ilmenite has TiO2 in the range between 40.04 and 46.6 wt %. Based on ore microscopy studies, the magnetite grains appear to be of two types: pure magnetite and titano-magnetite. Compositionally, the total magnetite fractions have Fe2O3 between 32 and 46 wt %, FeO between 19.0 and 25 wt % and TiO2 between 14.3 and 23.9 wt %. The chromite grains are an admixture of two varieties, ferro-chromite and magnesio-chromite. The chromite grains have 32.06-47.5 wt % of Cr2O3 with total iron between 23.86 wt % (4.73% Fe2O3 and 19.13% FeO) and 27.89 wt % (4.36% Fe2O3 and 23.53% FeO) and MgO between 12 and 40 wt %.The observed variations in the distribution of heavy minerals in the area are due to differences in the sediment supply, their specific gravity and oceanographic processes all of which result in a selective sorting of the sediments. The observed mineral assemblages of transparent heavy minerals (pyroxene, amphibole, tourmaline, kyanite, garnet, zircon and olivine) are suggestive of their derivation from a heterogeneous provenance comprising of igneous rocks, high grade metamorphic rocks and reworked Kaladgi sediments. The chromite grains appear to have been derived from ultrabasic rocks present in the upper reaches of the Gad River. The inferred reserves of ilmenite, magnetite and chromite are 0.175, 0.395 and 0.032 million tons, respectively.

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Section: Introductionmentioning

confidence: 99%

Ilmenite, Magnetite and Chromite Beach Placers from South Maharashtra, Central West Coast of India

et al. 2010

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“…18). The maximum concentration of heavy minerals in dune region is in Nainarkuppam (16.9%) which indicates turbulent and winnowing action of waves processes (Angusamy et al 2005). The relatively high abundance of pyroxene, amphiboles and ilemnite are due to the basic and acidic igneous rocks, high-grade metamorphic rocks and sedimentary rocks found in this region (e.g.…”

Section: Heavy/light Mineralsmentioning

confidence: 85%

“…The major soil type is sandy soil, which is mostly calcareous in nature, especially in the southern Chennai region. The coastal geomorphology of Chennai city and its surrounding region consists of beach/beach ridges, creek/ back water, mud flat, salt marshy, shallow pediments, swales, flood plains and alluvial and coastal plains (Angusamy and Rajamanickam 2007;Angusamy et al, 2005). The geological feature in the study area consists of shallow bedrock on the southwestern side (close to beach), and Gondwanas below the alluvium in the north and west.…”

Section: Geological Settingmentioning

confidence: 99%

“…The entire area is almost covered by the Pleistocene/Recent alluvium, deposited by the rivers Cooum and Adyar (Uma-Maheswari et al 2010). Various studies using granulometric variations in beach sediments of east coast of India has been carried out for coastal erosion (Anbarasu and Rajamanickam, 2002), placer deposits (Angusamy et al, 2005), depositional characters of sediments (Angusamy and Rajamanickam 2006;Chauhan 1990;Rajamanickam and Gujar, 1984) and grain size characters (Rajamanickam and Gujar, 1997). The offshore sediments in the region are clay silt and charnockite type rocks, found along with laterites with well rounded pebbles, small boulders at different depth interval.…”

Section: Geological Settingmentioning

confidence: 99%

“…The presence of pyroxene, amphibole, epidote and garnet in this zone (s.no. 15) suggests the possibility of recycled garnets from the sedimentary basin in the source region (Angusamy et al 2005). The sediments samples in some locations, viz Muttukadu, Injambakkam and Uthandi (Fig.5a-d) occur as dark black patches, which is mainly due to the concentration of heavy minerals and depend on the hydrodynamic conditions like sediment flux from the locality, wave energy, long shore currents and wind speed, which controls the littoral transport, sorting and deposition of placer minerals in these locations (eg.…”

Section: Heavy/light Mineralsmentioning

confidence: 99%

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Depositional Features in Tourist Beaches of Chennai Metropolis, SE Coast of India: Inferences from Grain Size Studies

Santhiya

Lakshumanan

Jonathan

et al. 2016

Journal of the Geological Society of India

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The present study was undertaken to examine the depositional and transportation pattern in the tourist beaches of Chennai in SE coast of India. Twenty four samples were analyzed for textural parameters, Linear discriminate function (LDF), C-M plots and heavy/light minerals from beach, berm and dune regions. Results of textural parameters indicate that they are coarse grained in the three regions. Majority of the samples indicate that they are moderately well sorted, symmetrically skewed and leptokurtic. The LDF analysis allowed in identifying areas that are characterized by: (1) beach, (2) shallow agitated environment and (3) fluvial deposits. C-M plots indicate that the sediments in the beaches were deposited from the near shore environment. Heavy mineral analysis suggests that the heavy and light minerals were in the range of 0.5 to 16.9% and 82.08 to 98.14% and the light/dark layers are controlled by the prevailing tidal conditions in the coastal region. It is observed that sand is accumulating from the shallow agitated environment, while the transportation and deposition of sediments is mainly due to the interaction of tidal activities at the same time. C-M plots suggest that the sediments fall in the graded suspension and the saltation activities in the region also facilitate to understand the hydrodynamics of the region suggesting that they are deposited by high-energy activities.

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Study of Beach Sand from Harihareshwar, Shrivardhan, and Diveagar Beach of Raigad District, Maharashtra, India

Wayal¹,

Mishra²,

Lavhale³

2023

Coasts, Estuaries and Lakes

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Coastal Placer Deposits of Central Tamil Nadu, India

Cited by 20 publications

References 14 publications

Ilmenite, Magnetite and Chromite Beach Placers from South Maharashtra, Central West Coast of India

Ilmenite, Magnetite and Chromite Beach Placers from South Maharashtra, Central West Coast of India

Depositional Features in Tourist Beaches of Chennai Metropolis, SE Coast of India: Inferences from Grain Size Studies

Study of Beach Sand from Harihareshwar, Shrivardhan, and Diveagar Beach of Raigad District, Maharashtra, India

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