Evaluating the timing and origin of quartz cement is central to understanding how porosity is lost in sandstone during burial. In this contribution, Harwood et al. describe high-precision, in situ oxygen isotope analyses of sandstone from the Jurassic Ness Formation from the North Sea. The results reveal the growth history of single quartz overgrowths to a resolution of 2 µm. Combined petrographic and isotopic data are interpreted in terms of a process in which quartz cement formed continuously from 60-70°C to the current maximum temperature of 130°C in a highly restricted system within which waters evolved isotopically as a result of water-rock reactions. The data are consistent with predictive, conceptual quartz cementation models and provide a critical link from micron-scale measurements to basin-scale predictions and observations.
Quartz cementation history of sandstones revealed byhigh-resolution SIMS oxygen isotope analysis by Joseph Harwood, Andrew C. Aplin, Claire I.
Fialips, James E. Iliffe, Reinhard Kozdon, Takayuki Ushikubo, and John W. Valley