Phyllosilicates and zeolite assemblages in the carbonate periplatform of the Great Bahama Bank: origin and relation to diagenetic processes (ODP Leg 166, Sites 1006 and 1007)

The mineral dissolution rate conundrum: Insights from reactive transport modeling of U isotopes and pore fluid chemistry in marine sediments

“…Recent field and experimental studies have demonstrated that appreciable precipitation of illite, smectite, and kaolinite occurs in the early stages of diagenesis and at low temperatures (ca. 3-25°C) (Cole, 1985;Karpoff et al, 2002;Mackin and Aller, 1986;Aller, 1995, 2004). The decreasing K/Cl and Mg/Cl ratios and increasing Na/Cl ratios in pore water from Site 984 also suggest that the K + and Mg profiles are a result of secondary clay precipitation.…”

Quaternary sedimentary processes on the Bahamas: From platform to abyss

“…Despite the modern abundance of almost pure carbonate sediments off the Bahamas since the Pleistocene, the seabed has experienced episodes with enriched clay deposition. For some periods and locations, this enrichment resulted in an increase in clay minerals concentration within the carbonate ooze, as for example in the Straits of Florida during the Miocene (Swart et al, 2000;Karpoff et al, 2002). Pelagic carbonate deposits with intercalated clay-rich layers occur within the GAC head and margins and are synchronous with pelagic carbonate deposits with clay-rich layers present on the Blake Outer Ridge further north (Fig.…”

Multiphase Silurian bentonites in the Baltic Palaeobasin

“…The authigenic clay mineral, feldspar and zeolite paragenesis of continental or marine sediments can also reflect the environmental conditions prevalent during deposition and early diagenetic evolution of these sequences (e.g. Kastner and Siever, 1979;Kastner, 1981;Christidis et al, 1995;Aoki and Kohyama, 1998;Karpoff et al, 2002). Nevertheless, primary diagenetic mineral assemblages and textures of devitrified ash are, in most cases, replaced in the course of consequent diagenesis in geologically older beds, as in Palaeozoic bentonites.…”