Browsing by Subject "texture"
Now showing items 1-18 of 18
-
Alteration of basaltic glasses from the Central Indian Ocean
(Geological Society of India, 1999)Textural, mineralogical and compositional characteristics of basaltic glasses from the Central Indian Ocean show them to be altered to varying extents through their interaction with the seawater, resulting in the formation ... -
Authigenic Gypsum in a Deep Sea Core from Southeastern Arabian Sea
(Geological Society of India, 1980)Authigenic gypsum has been encountered in a deep sea core RC9-157 from the southeastern Arabian Sea at a depth of 4111 m which is a zone of lysocline. The formation of gypsum in the deep sea region is attributed to the ... -
Coexistence of pumice and manganese nodule fields-evidence for submarine silicic volcanism in the Central Indian Basin
(Pergamon, 1993)Pumice, of various shapes and sizes, uncoated or coatEd. by ferromanganese oxides, have been recovered from deeper parts of the Central Indian Basin (CIB). The pumice field covers an area of 600,000 km sup(2), approximately ... -
Controls on organic carbon distribution in sediments from the eastern Arabian Sea margin
(Springer, 1997)Sediment cores from the upper continental slope of the eastern Arabian Sea have high organic carbon (OC), CaCO sub(3), and sand content at the top. The values decrease with increasing depth in the Holocene and Upper ... -
Distribution of Al, Mn, Ni, Co & Cu in the Non-Lithogenous fractions of Sediments of the Northern Half of the Western Continental Shelf of India
(CSIR-NISCAIR, 1980)Higher amounts of elements are associated with the nonlithogenous fractions of the fine grained terrigenous sediments of the innershelf region with low carbonate content than with the corresponding fractions of the coarse ... -
Distribution of clay minerals in marine sediments off Chennai, Bay of Bengal, India: Indicators of sediment sources and transport processes .
(Elsevier, 2014)Clay mineralogy, texture size and statistical analyses were carried out on surface sediments from the continental shelf of Chennai, Bay of Bengal, India. The purpose of this study is to characterize the clay mineral ... -
Evidence for recent hydrothermal activity in the Central Indian Basin
(Pergamon, 1997)This study documents the first actual prof of recent intraplate volcanic-hydrothermal activity in the Central Indian Basin (CIB). Twenty-six surface sediments and a spade core (37 cm long) from the CIB were examined for ... -
Identification and characterization of tsunami deposits off southeast coast of India from the 2004 Indian Ocean tsunami: Rock magnetic and geochemical approach.
(Indian Academy of Sciences, 2014)The December 2004 Indian Ocean Tsunami (IOT) had a major impact on the geomorphology and sedimentology of the east coast of India. Estimation of the magnitude of the tsunami from its deposits is a challenging topic to be ... -
Lithological and mineralogical changes observed in a core from the western Bay of Bengal
(Allied, New Delhi (India), 1997)Lithological and mineralogical studies were carried out on sediments from a 650 cm long core from the north western Bay of Bengal at a depth of 2700 m. These studies demarcate a boundary at 380 cm designated as unit 1 from ... -
Morphology and petrography of pumice from the Central Indian Ocean Basin
(CSIR-NISCAIR, 1988)Majority of pumice are equant with high Corey's shape factor values. Petrographic studies indicate flow bands of isotropic nature, with varied vesicle shape and size, and the diffractograms show them to be mainly composed ... -
Occurrence of rhyolytic tuffs at deep sea drilling project site 219 on the Laccadive Ridge
(Geological Society of India, 1976)A study of thin sections from the lower and middle parts of Unit 5 (Paleocene) from Site 219 shows that these largely consist of acidic or rhyolitic tuffs. The overlying limestones in Unit 5 (Paleocene) and Unit 4 (Lower ... -
Petrology of tectonically segmented Central Indian Ridge
(Current Science Association, Bangalore, India, 1993)Distribution and mineralogy of various rock types along the 4200-km-long slow-spreading Central Indian Ridge, between Owen fracture zone in the north and Indian Ocean triple junction in the south, is studied in the light ... -
Size, surface texture, chemical composition and mineralogy interrelations in ferromanganese nodules of central Indian Ocean
(CSIR-NISCAIR, 1989)Fiftyseven ferromanganese nodules, classified into 3 size class (4,4-6 and 6-8 cm diam.), from the siliceous sediments of central Indian Ocean were analysed for transition metals and representative sample from each size ... -
Studies on the sediments of Vembanad Lake, Kerala state Part III Distribution and interpretation of bottom sediments
(CSIR-NISCAIR, 1974)Distribution patterns of FE, Mn, Ti, Ni, Co and Cu in sediments of Vembanad Lake and adjoining river systems have revealed that (1) elemental concentrations follow closely the texture of the sediments, (2) river sands ... -
Studies on the Sediments of Vembanad Lake, Kerala State. 4. Distribution of Trace Elements
(CSIR-NISCAIR, 1981)Distribution patterns of FE, Mn, Ti, Ni, Co and Cu in sediments of Vembanad Lake and adjoining river systems have revealed that (1) elemental concentrations follow closely the texture of the sediments, (2) river sands ... -
Studies on the sediments of Vembanad Lake, Kerala State: Part I - Distribution of organic matter
(CSIR-NISCAIR, 1972)Distribution patterns of FE, Mn, Ti, Ni, Co and Cu in sediments of Vembanad Lake and adjoining river systems have revealed that (1) elemental concentrations follow closely the texture of the sediments, (2) river sands ... -
Studies on the sediments of Vembanad Lake, Kerala state: Part II - Distribution of phosphorus
(CSIR-NISCAIR, 1972)Distribution patterns of FE, Mn, Ti, Ni, Co and Cu in sediments of Vembanad Lake and adjoining river systems have revealed that (1) elemental concentrations follow closely the texture of the sediments, (2) river sands ... -
Verdine and glaucony facies from surficial sediments of the eastern continental margin of India
(Elsevier, 1995)The present paper reports the first mineralogical description of green grains (verdine and glaucony) from sediments of the eastern continental margin of India. Only 24 of the 82 sediment samples studied, at depths between ...