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Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts
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The samples were collected under the project “Surveys for Polymetallic Nodules” project funded by Ministry of Earth Sciences, (previously Department of Ocean Development), New Delhi. PD acknowledges the Council of Scientific and Industrial Research, New Delhi, for financial assistance in the form of a Research Fellowship. We thank the Director for permission to publish this work. We acknowledge the help received from colleagues at the Wadia Institute of Himalayan Geology (Dehradun), National Geophysical Research Institute (Hyderabad) and Allahabad University (Allahabad) during analyses.


Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts
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    摘要:

    The Central Indian Ocean Basin (CIOB) basalts are plagioclase-rich, while olivine and pyroxene are very few. The analyses of 41 samples reveal high FeOT (~10–18 wt%) and TiO2 (~1.4–2.7 wt%) indicating a ferrobasaltic composition. The basalts have high incompatible elements (Zr 63–228 ppm; Nb ~1–5 ppm; Ba ~15–78 ppm; La ~3–16 ppm), a similar U/Pb (0.02–0.4) ratio as the normal mid-oceanic basalt (0.16±0.07) but the Ba/Nb (12.5–53) ratio is much larger than that of the normal mid-oceanic ridge basalt (~5.7) and Primitive Mantle (9.56). Interestingly almost all of the basalts have a significant negative Eu anomaly (Eu/Eu*=0.78–1.00) that may have been a result of the removal of feldspar and pyroxene during crystal fractionation. These compositional variations suggest that the basalts were derived through fractional crystallization together with low partial melting of a shallow seated magma.

    Abstract:

    The Central Indian Ocean Basin (CIOB) basalts are plagioclase-rich, while olivine and pyroxene are very few. The analyses of 41 samples reveal high FeOT (~10–18 wt%) and TiO2 (~1.4–2.7 wt%) indicating a ferrobasaltic composition. The basalts have high incompatible elements (Zr 63–228 ppm; Nb ~1–5 ppm; Ba ~15–78 ppm; La ~3–16 ppm), a similar U/Pb (0.02–0.4) ratio as the normal mid-oceanic basalt (0.16±0.07) but the Ba/Nb (12.5–53) ratio is much larger than that of the normal mid-oceanic ridge basalt (~5.7) and Primitive Mantle (9.56). Interestingly almost all of the basalts have a significant negative Eu anomaly (Eu/Eu*=0.78–1.00) that may have been a result of the removal of feldspar and pyroxene during crystal fractionation. These compositional variations suggest that the basalts were derived through fractional crystallization together with low partial melting of a shallow seated magma.

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Pranab DAS, Sridhar D. IYER and Sugata HAZRA.2012. Petrological Characteristics and Genesis of the Central Indian Ocean Basin Basalts[J]. ACTA GEOLOGICA SINICA(English edition),86(5):1154~1170

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  • 收稿日期:2011-10-09
  • 最后修改日期:2012-05-20
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