Composition and distribution of silica in sediments of the Broken Ridge, supplement to: Littke, Ralf; Fourtanier, Elisabeth; Thurow, Juergen W; Taylor, Elliott (1991): Silica diagenesis and its effects on lithification of Broken Ridge deposits, Central Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 261-272

Ralf Littke, Elisabeth Fourtanier, Juergen W Thurow & Elliott Taylor
Within a dipping sequence of middle Cretaceous to Eocene sediments on Broken Ridge, opal-A, opal-CT, and quartz occur as minor constituents in carbonate and ash-rich sediments. Biogenic opal-A is mainly derived from diatoms and radiolarians. Opal-A and almost all siliceous microfossils disappear within a narrow (<20-m-thick) transition zone below which authigenic opal-CT and quartz are present. These latter silica polymorphs occur together within a 750-m-thick interval, but the ratio of quartz/opal-CT increases with increasing age...
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