Browsing Scholarly literature by Subject "ferromanganese nodules"
Now showing items 61-80 of 96
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Marine minerals: The Indian perspective
(1988)The sea floor of the continental margins of India is covered by a wide variety of terrigenous, biogenous, and chemogenous mineral deposits. Terrigenous heavy mineral placers containing ilmenite, magnetite, monazite, zircon, ... -
Mineral resources
(Oxford and IBH, New Delhi, 2001)Marine minerals have been center of attraction to mankind since ancient times. The technological advances in the recent years show that the retrieval of underwater minerals from deep-sea can no longer be a dream. Marine ... -
Mineralogy and chemistry of manganese nodules from the Southern part of Carlsberg Ridge
(Geological Society of India, 1985)Petrographic study indicates that the nucleus of nodules is generally composed of clay, volcanic glass, basalt fragments, and earlier nodules. polished sections indicate typical collomorphic globular segregations and partly ... -
Mineralogy of polymetallic nodules and associated sediments from the Central Indian Ocean Basin
(Elsevier, 1987)Todorokite is the dominant mineral phase in the nodules of the northern Central Indian Ocean Basin. These nodules are characterised by a rough surface texture, are relatively rich in Mn, Cu and Ni, and are associated with ... -
Morphological and interlayer geochemical studies on manganese nodules from the southwestern Carlsberg ridge
(Elsevier, 1988)Mixed facies of manganese nodules from the southwestern Carlberg Ridge have been analysed for Mn, Fe, Ni, Cu, Co and Zn. Seventy one analyses including the averages presented for outer layer, inner layer and near-core ... -
Morphological features of Co-rich manganese deposits and their relation to seabed slopes
(Taylor and Francis, 2000)The morphological features associated with Co-rich manganese deposits, the size variations of nodules, and the occurrence of different substrates have been analyzed, to evaluate the influence of various seabed slope angles ... -
Morphological variations in the polymetallic nodules from selected stations in the Central Indian Ocean
(Springer, 1987)Polymetallic nodules from the Central Indian Ocean largely range in size from 2 to 6 cm. The smaller nodules (4 cm) are subspheroidal to spheroidal in shape and with the increase in size, nodules become more discoidal and ... -
Multibeam echosounder pseudo sidescan images as a tool for manganese nodule exploration
(International Society of Offshore and Polar Engineers, Cupertino, CA (USA), 1999)Deep ocean floor is the storehouse of vast quantities of mineral resources and manganese nodules are one of the important resources. The method of semi quantitative evaluation of nodule resource estimation using the rms ... -
Nature, distribution and origin of clay minerals in grain size fractions of sediments from manganese nodule field, Central Indian Ocean Basin
(CSIR-NISCAIR, 1988)DT, IR and X-ray diffraction analyses have been carried out on 3 grain size fractions (1, 1-2 and 2-4 mu m) of sediments from the Central Indian Ocean Basin. Results indicate that there are 2 smectite minerals (montmorillonite ... -
Neogene oceanographic variations recorded in manganese nodules from the Somali Basin
(Elsevier, 1993)A detailed study of a nodule from the Somali Basin datEd. by sup(230)Th sub(excess) was correlated with the paleoceanographic events recorded in Site 236 (Leg 24) Deep Sea Drilling Project (DSDP) cores. Tentative indications ... -
Nodules size: An important factor in nodule mining?
(Int. Soc. of Offshore and Polar-Eng.(ISOPE), Colorado, USA, 1995)A study of about 850 different sized nodules from 234 sites in the Central Indian Basin (CIB) showed a clear inverse relationship between size and grade of nodules. Among the different sized nodules, only the small (less ... -
Notes and comments on exploration for polymetallic nodules in the Indian Ocean
(Taylor and Francis, 1988)A study of polymetallic nodules in the Indian Ocean taken up as and R&D Project has been extended into an exploratory programme for nodule resources. recognition of India as a Pioneer Investor by the UNCLOS led to the ... -
On the nature of the calcareous substrate of a ferromanganese crust from the Vityaz Fracture Zone, Central Indian Ridge: Inferences on palaeoceanography
(Springer, 2002)A 15-cm-thick carbonate substrate encrusted with ferromanganese oxides from the Vityaz Fracture Zone, Central Indian Ridge was analysed to reconstruct the palaeoceanography of the region. Based on the calcareous nannoplankton ... -
On the occurrence of ferromanganese micronodules from the sediments of the Bengal Fan: A high terrigenous sediment input region
(Elsevier, 1994)Studies of 13 samples (10 surface sediments and 3 cores) from across the middle fan region of the Bay of Bengal reveal the presence of micronodules (area 0.22 million km@u2@@) over the entire bay. These micronodules have ... -
Opportunities for offshore mineral exploration in the Indian Ocean
(International Society of Offshore and Polar Engineers, Cupertino, CA (USA), 1999)The Indian Ocean offers several opportunities for offshore mineral resources in the nearshore and coastal areas, the EEZs of different countries as well as the deep sea regions. The coastal and nearshore resources of heavy ... -
Optimum sampling interval for evaluating ferromanganese nodule resources in the central Indian Ocean
(Springer, 2001)A study to estimate manganese nodule abundance (weight of nodules in kg/m sup(2)) was carried out in a small area of the abyssal plains covering a one-degree square block in the central Indian Basin. Abundance was assessed ... -
Ore grade manganese nodules from the central Indian basin: an evaluation
(1989)Comparative studies on manganese nodules from two different areas (S and R) in the Central Indian Basin show distinct variations in their composition, grade (percent Ni + Cu), and abundance (kg/m2), which are explained in ... -
Palaeogene hardgrounds and associated intraclast lag deposits as the substrates of ferromanganese crusts and nuclei of nodules: Inferences of abyssal current in the Central Indian Ocean Basin
(Palaeontological Society of India, 1995)The Palaeogene substrates of ferromanganese crusts and nuclei of nodules collected from the Central Indian Basin chiefly consist of incipient to younger pelagic hard grounds and associated intraclast lag deposits. The ... -
Paleogene ichthyoliths from the substrates of ferromanganese encrustations and nuclei of manganese nodules from the Central Indian Basin
(Palaeontological Society of India, 1987)Ichthyoliths, the phosphatic microscopic skeletal debris of the fishes are found in the substrates and the nuclei of ferromanganese encrustations and the nodules collected from the Central Indian Ocean Basin. About thirty ... -
Petrogenesis of ferromanganese nodules from east of the Chagos Archipelago, Central Indian Basin, Indian Ocean
(Elsevier, 1999)Deep-sea ferromanganese nodules occur over a large area and on many different sediment types of the Central Indian Basin, Indian Ocean. Selected samples were studied to determine their chemical and mineralogical compositions ...