Now showing items 1-14 of 14

    • A petrographic study of Precambrian quartzites from Goa coast 

      Wagle, B.G.; Rajamanickam, G.V. (Indian Association for Limnology and Oceanography, 1980)
      A petrographic and heavy minerals study of quartzites along the Goa Coast, India has been undertaken to decipher their sediment history. The quartzite outcrops exhibit well preserved primary sedimentary structures like ...
    • Cerium anomaly variations in ferromanganese nodules and crusts from the Indian Ocean 

      Nath, B.N.; Roelandts, I.; Sudhakar, M.; Pluger, W.L.; Balaram, V. (Elsevier, 1994)
      Fifty analyses of rare earth elements as well as mineralogical studies have been carried out on a suite of manganese nodules and crusts from the Central Indian Basin and the Western Indian Ocean. The aim was to identify ...
    • Evolution of the basalts from three back-arc basins of southwest Pacific 

      Mudholkar, A.V.; Paropkari, A.L. (Springer, 1999)
      Petrography, petrochemistry, and mineral chemistry of basalts from the Woodlark, Manus, and Lau basins from the southwest Pacific have been studied to understand their magmatic evolution. Basalt from the western Woodlark ...
    • Morphology and petrography of pumice from the Central Indian Ocean Basin 

      Iyer, S.D.; Karisiddaiah, S.M. (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 

      Siddiquie, H.N.; Sukheswala, R.N. (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 ...
    • Petrography of basalts from the Carlsberg ridge 

      Banerjee, R.; Iyer, S.D. (CSIR-NISCAIR, 1989)
      Petrographic characteristics of basalts collected from a segment of the Carlsberg Ridge (lat. 3 degrees 35'N to 3 degrees 41'N; long. 64 degrees 05'E to 64 degrees 09'E) show typical pillow lava zonations with variable ...
    • Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts 

      Das, P.; Iyer, S.D.; Hazra, S. (Geological Society of China, 2012)
      The Central Indian Ocean Basin (CIOB) basalts are plagioclase-rich, while olivine and pyroxene are very few. The analyses of 41 samples reveal high FeO sup(T) (approx. 10-18 wt percent) and TiO sub(2) (approx. 1.4-2.7 wt ...
    • Petrology of offshore basalts of Bombay harbour area, west coast of India 

      Karisiddaiah, S.M. (CSIR-NISCAIR, 1988)
      Recent marine geological and geophysical surveys indicate that the Deccan Traps extend to the offshore area of Bombay. Cores from bore holes in Deccan Traps collected from Bombay Harbour have been classified as basalts, ...
    • Petrology of seamounts in the Central Indian Ocean Basin: Evidence for near-axis origin 

      Mukhopadhyay, R.; Batiza, R.; Iyer, S.D. (Springer, 1995)
      Previous studies on the distribution and morphology of ancient seamount chains (>50 Ma) in the Central Indian Ocean basin (CIOB) indicated their generation from the fast spreading Southeast Indian Ridge. The petrology of ...
    • Petrology of tectonically segmented Central Indian Ridge 

      Mukhopadhyay, R.; Iyer, S.D. (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 ...
    • Physical properties, morphology and petrological characteristics of pumices from the Central Indian Ocean Basin 

      Kalangutkar, N.G.; Iyer, S.D.; Ilangovan, D. (Geological Society of China, 2011)
      About 400 pumice clasts collected from the Central Indian Ocean Basin (CIOB) were studied for their morphology and classified based on their shape and size. A majority of the samples range between less than 1 cm and 36 cm ...
    • Quaternary phosphorites off the southeast coast of India 

      Rao, V.P.; Michard, A.; Naqvi, S.W.A.; Boettcher, M.E.; Krishnaswamy, R.; Thamban, M.; Natarajan, R.; Borole, D.V. (Elsevier, 2002)
      Detailed petrological, mineralogical, geochemical and radiogenic (U, Sr, Nd) and stable isotope (C, O, S) studies have been carried out on the Quaternary phosphorites of the continental margin off Chennai, southeast coast ...
    • Synthesis of morphotectonics and volcanics of the Central Indian Ocean Basin 

      Mukherjee, A.D.; Iyer, S.D. (Current Science Association, Bangalore, India, 1999)
      The Central Indian Ocean Basin (CIOB) is an enigmatic ocean basin in the young and tectonically complex Indian Ocean. Major tectonic and volcanic forms identified are fracture zones, abyssal hills, seamounts and ridges and ...
    • Tectonic and volcanic implications of a cratered seamount off Nicobar Island, Andaman Sea 

      KameshRaju, K.A.; Ray, D.; Mudholkar, A.V.; Murty, G.P.S.; Gahalaut, V.K.; Samudrala, K.; Paropkari, A.L.; Ramachandran, R.; SuryaPrakash, L. (Elsevier, 2012)
      The region of the Nicobar earthquake swarm of January 2005 has been explored during a recent cruise using multibeam swath bathymetry, seafloor imaging and TV-guided sampling to decipher the seafloor morphology, nature and ...