Now showing items 1-16 of 16

    • A note on sulphide-oxide mineralisation in Carlsberg Ridge basalts 

      Banerjee, R.; Iyer, S.D. (Geological Society of India, 1993)
      Pillow basalts from the Carlsberg Ridge at 3 degrees 35'N contain disseminated chalcopyrite, pyrite, and magnetite. The euhedral shape of the pyrite grains indicate them to be early formed and grown unobstructed while ...
    • Alteration of basaltic glasses from the Central Indian Ocean 

      Iyer, S.D. (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 ...
    • Basalt microlapilli in deep sea sediments of Indian Ocean in the vicinity of Vityaz fracture zone 

      Nath, B.N.; Iyer, S.D. (Geological Society of India, 1989)
      Two cores recovered from the flanks of Mid-India oceanic ridge in the vicinity of Vityaz fracture zone consist of discrete pyroclastic layers at various depths. These layers are composed of coarse-grained, angular basaltic ...
    • 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 ...
    • Ferrobasalts from the Central Indian Ocean Basin 

      Iyer, S.D.; Mukhopadhyay, R.; Popko, D.C. (Springer, 1999)
      The occurrence of ferrobasalts recovered from the Central Indian Ocean Basin crust generated at the Southeast Indian Ridge during a phase of moderate to fast spreading accretion (approx 110-190 mm/yr, full rate) is reported. ...
    • Geochemical identification of impactor for Lonar crater, India 

      Mishra, Saumitra; Newsom, H.E.; ShyamPrasad, M.; Geissman, J.W.; Dube, A.; Sengupta, D. (The Meteoritical Society, 2009)
      The only well-known terrestrial analogue of impact craters in basaltic crusts of the rocky planets is the Lonar crater, India. For the first time, evidence of the impactor that formed the crater has been identified within ...
    • Leg 179 summary 

      Pettigrew, T.J.; Casey, J.F.; Miller, D.J.; Araki, E.; Boissonnas, R.; Busby, R.; Einaudi, F.; Gerdom, M.; Guo, Z.P.; Hopkins, H.; Myers, G.; Rao, D.G.; Shibata, T.; Thy, P. (ODP, Texas A and M Univ., USA, 1999)
      Ocean Drilling Program (ODP) Leg 179 set out with two primary objectives. These objectives were (1) testing the recently developed hammer drill-in casing system on the Atlantis Bank, Southwest Indian Ridge (SWIR), and (2) ...
    • Marine magnetic anomalies off Ratnagiri, Western continental shelf of India 

      Rao, D.G. (Elsevier, 1984)
      Total magnetic intensity and bathymetric surveys were carried out in the offshore area of Ratnagiri on the western continental shelf of India and an isomagnetic anomalies map at a contour interval of 50 nT was prepared ...
    • Marine magnetic anomalies off the southwest coast of India and their analysis 

      Rao, D.G.; Bhattacharya, G.C. (Geological Society of India, 1977)
      Total magnetic intensity and bathymetric surveys were carried out in the offshore area of Ratnagiri on the western continental shelf of India and an isomagnetic anomalies map at a contour interval of 50 nT was prepared ...
    • Marine magnetic profiles from the Direction Bank to the Kori Bank, Western Continental shelf of India 

      Ramana, M.V.; Subrahmanyam, V.; SubbaRaju, L.V. (Geological Society of India, 1986)
      Total magnetic field intensity measurements along two parallel NW-SE tracks from the Direction Bank to the Kori Bank show corelatable magnetic anomalies. High frequency positive anomalies observed northwest of Kathiawar ...
    • Mineral chemistry of Carlsberg Ridge basalts at 3 degrees 35'- 3 degrees 41' N 

      Iyer, S.D.; Banerjee, R. (Springer, 1993)
      Mineral chemical analyses of transitional basalts from the Carlsberg Ridge show plagioclase (An approximately 87 mole %), phenocrysts, and microphenocrysts have a K sub(2)O depletion as compared to the laths (approximately ...
    • Mobilization of manganese by basalt associated Mn(II)-oxidizing bacteria from the Indian Ridge System 

      Sujith, P.P.; Mourya, B.S.; Krishnamurthi, S.; Meena, R.M.; LokaBharathi, P.A. (Elsevier, 2014)
      The Indian Ridge System basalt bearing Mn-oxide coatings had todorokite as the major and birnesite as the minor mineral. We posit that microorganisms associated with these basalts participate in the oxidation of Mn and ...
    • Paleocene on-spreading-axis hotspot volcanism along the Ninetyeast Ridge: An interaction between the Kerguelen hotspot and the Wharton spreading center 

      Krishna, K.S.; Gopala Rao, D.; SubbaRaju, L.V.; Chaubey, A.K.; Shcherbakov, V.S.; Pilipenko, A.I.; Murthy, I.V.R. (Indian Academy of Sciences, Bangalore, India, 1999)
      Investigations of three plausible tectonic settings of the Kerguelen hotspot relative to the Wharton spreading center evoke the on-spreading-axis hotspot volcanism of Paleocene (60-54 Ma) age along the Ninetyeast Ridge. ...
    • 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, ...