Diagenetic alterations related to marine transgression and regression in fluvial and shallow marine sandstones of the Triassic Buntsandstein and Keuper sequence, the Paris Basin, France

The influence of climate on early and burial diagenesis of Triassic and Jurassic sandstones from the Norwegian–Danish Basin

“…Kaolinite precipitation, promoted by meteoric water, probably occurred in fluvial, estuarine‐fluvial, lagoonal and even shoreface sandstones, if forced into the latter by a hydraulic head (Bjørlykke & Aagaard, ). Meteoric water flushing may have intensified during shoreline progradation associated with relative sea‐level falls (Burley, ; Ketzer et al ., ; Ruffel et al ., ; El‐ghali et al ., ), which occurred several time during deposition of the Gassum Formation (Nielsen, ).…”

Diagenetic history of the Surma Group sandstones (Miocene) in the Surma Basin, Bangladesh

“…Fe-calcite typically occurs as an isolated pore-filling cement at depths of >3100 m. The second mode of generation of Fe-calcite as an isolated pore filling cement impedes the phase of quartz cementation and formed within more compacted sandstones. Using the d 18 O VPDB values (À10.3‰ to À12.4‰) of these carbonate cements (calcite cement mainly), the fractionation equation of Friedman and O'Neil (1977), and assuming d 18 O SMOW value of for evolved pore water between $À4‰ and $0‰ relative to the mixed marine-meteoric waters (À6‰ and À4‰), indicating that the precipitation of carbonate would have occurred at temperatures of 85-115°C (see El-ghali et al, 2009). These temperatures are in agreement with the present borehole temperatures (BHT $53-120°C) at the depth of cement occurrence encountered in the wells.…”

Linking diagenesis to sequence stratigraphy in fluvial and shallow marine sandstones: Evidence from the Cambrian–Ordovician lower sandstone unit in southwestern Sinai, Egypt

“…Eogenetic alterations associated with the lowstand system tract and sequence boundaries During the lowstand system tract deposition, relative sea-level fall and regression promoted meteoric water circulation through the LST fluvial sandstones as a consequence of the influx of meteoric water into the deposited sediments and by the basinward shift of meteoric water zones (Morad et al, , 2010Ketzer et al, 2002Ketzer et al, , 2003aEl-Ghali et al, 2006b, 2009b. The meteoric water circulation during eodiagenesis in the LST fluvial sandstones resulted in extensive dissolution of framework grains such as feldspars (Fig.…”