Abstract
Silica diagenesis and carbonate diagenesis are interrelated. This is confirmed by observations of DSDP Sites 462, 463, 465, 466, and 577. Carbonate sediments containing chert (1) tend to be more indurated and display more advanced diagenetic alterations, regardless of sub-bottom depth; and (2) microfossil components are more strongly affected (overgrown and/or dissolved), while the amount of micritic particles and larger, euhedral calcite crystals is greater. In addition, mass physical properties, porosity in particular, vary more widely in sediment sections containing chert. Furthermore, in the studied similarly composed sediments recrystallization of biogenic opal is indicated by a significant reduction of the specific surface area, reaching a minimum value when quartz is formed.
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