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Vertical effective stress as a control on quartz cementation in sandstones

Oye, Olakunle J.; Aplin, Andrew C.; Jones, Stuart J.; Gluyas, Jon G.; Bowen, Leon; Orland, Ian J.; Valley, John W.

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Authors

Olakunle J. Oye

Jon G. Gluyas

Leon Bowen

Ian J. Orland

John W. Valley



Abstract

Temperature-controlled precipitation kinetics has become the overwhelmingly dominant hypothesis for the control of quartz cementation in sandstones. Here, we integrate quantitative petrographic data, high spatial resolution oxygen isotope analyses of quartz cement, basin modelling and a kinetic model for quartz precipitation to suggest that the supply of silica from stress-sensitive intergranular pressure dissolution at grain contacts is in fact a key control on quartz cementation in sandstones. We present data from highly overpressured sandstones in which, despite the current burial temperature of 190 °C, quartz cement occurs in low amounts (4.6 ± 1.2% of bulk volume). In situ oxygen isotope data across quartz overgrowths suggest that cementation occurred over 100 Ma and a temperature range of 80–150 °C, during which time high fluid overpressures resulted in consistently low vertical effective stress. We argue that the very low amounts of quartz cement can only be explained by the low vertical effective stress which occurred throughout the burial history and which restricted silica supply as a result of a low rate of intergranular pressure dissolution at grain contacts.

Journal Article Type Article
Acceptance Date Sep 14, 2018
Online Publication Date Sep 17, 2018
Publication Date Dec 1, 2018
Deposit Date Sep 18, 2018
Publicly Available Date Sep 17, 2019
Journal Marine and Petroleum Geology
Print ISSN 0264-8172
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 98
Pages 640-652
DOI https://doi.org/10.1016/j.marpetgeo.2018.09.017
Public URL https://durham-repository.worktribe.com/output/1319943

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