Environments of Formation and Controls on Spatial Distribution of Calcite Cementation in Plio-Pleistocene Fluvial Deposits, New Mexico, U.S.A.

Distribution of diagenetic alterations within depositional facies and sequence stratigraphic framework of fluvial sandstones: Evidence from the Petrohan Terrigenous Group, Lower Triassic, NW Bulgaria

“…Such a distribution pattern of micritic and microcrystalline calcite related to spatial and temporal distribution of palaeosols is known elsewhere (Esteban and Klappa, 1983;Wright and Tucker, 1991;Mack et al, 1993;Beckner and Mozley, 1998;Garcia et al, 1998;Hall et al, 2004). Micritic and microcrystalline calcite in palaeosol have presumably formed in the vadose zone (Hall et al, 2004) during near-surface diagenesis, as evidenced by dense micritic texture (Mora et al, 1993;Beckner and Mozley, 1998) and rhizocretionary structure (Retallack, 1988;Monger et al, 1991;Hall et al, 2004). Using the d 18 O VPDB values of micritic and microcrystalline calcite (À8.1& to À7.5&), the fractionation equation of Friedman and O'Neil (1977), and assuming pore water with d 18 O V-SMOW values (À7& to À5&) which are equivalent to those of meteoric waters of the basin during the Lower Triassic (Craig and Gordon, 1965), precipitation would have occurred at temperatures of 19 C and 32 C (Fig.…”

“…Micritic and microcrystalline calcite occur in palaeosol horizons, which developed on crevasse splay and channel sandstones of LST and TST. Such a distribution pattern of micritic and microcrystalline calcite related to spatial and temporal distribution of palaeosols is known elsewhere (Esteban and Klappa, 1983;Wright and Tucker, 1991;Mack et al, 1993;Beckner and Mozley, 1998;Garcia et al, 1998;Hall et al, 2004). Micritic and microcrystalline calcite in palaeosol have presumably formed in the vadose zone (Hall et al, 2004) during near-surface diagenesis, as evidenced by dense micritic texture (Mora et al, 1993;Beckner and Mozley, 1998) and rhizocretionary structure (Retallack, 1988;Monger et al, 1991;Hall et al, 2004).…”

Composition, porosity, and reservoir potential of the Middle Jurassic Kashafrud Formation, northeast Iran

“…Some conglomerates and sandstones have "floating" grains in calcite cement (cf. Hall et al, 2004;McBride et al, 1987), and Poursoltani et al (2007a) attributed a dolostone unit to earlydiagenetic carbonate activity under pedogenic or palustrine conditions. Some clays, especially kaolinite, may have been formed during surface weathering.…”

A cementation method of loose particles based on microbe-based cement

“…These factors include the number of bacteria present, the metabolic activity of bacterial cells, the total volume of bioavailable nutrients injected, the concentration of calcium and carbonate, and the pH of the environment. Moreover, the ability to transport Ca 2+ and/or HCO 3  to the precipitation site, the presence of pre-existing carbonate substrate, the permeability as well as the composition, and stabilization of the sediment itself play an important role in calcite precipitation [6,[30][31][32].…”