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    Relict ooids off northwestern India: Inferences on their genesis and late Quaternary sea level

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    Sedim_Geol_358_44.pdf (916.0Kb)
    Date
    2017
    Author
    Rao, V.P.
    Milliman, J.D.
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    Abstract
    Relict carbonate sands dominated by ooids and faecal pellets are common on the continental shelf, between 60 and 110m, off northwestern India. The shiny tan/white aragonitic ooids closely resemble modern Bahamian ooids, with cortex thicknesses varying from <5?m to 200?m. Tangential laminae, ranging from 1?m to 20?m in diameter, occur as straight to contorted stacked tubules, similar in appearance to algal or microbial filaments. Bacteria associated with the decaying organic sheath of the laminae may have played an important role in subsequent aragonite precipitation. Bladed or radial aragonite microstructures are secondary features in the cortex, apparently formed during early diagenesis by mineralization of organic matter associated with the tangential laminae. Calibrated ages of the ooids range between 9.8 and >23kaBP, and ?18O values suggest that these relict ooids formed during cooler and drier post-LGM conditions and later during the re-intensified Holocene monsoon climate. An age vs. depth plot suggests that most of the ooids formed at water depths between ~10 and ?40m, thereby calling into question whether relict shelf ooids are reliable indicators of past sea level.
    URI
    https://doi.org/10.1016/J.SEDGEO.2017.06.004
    http://drs.nio.org/drs/handle/2264/7826
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