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Vertical effective stress as a control on quartz cementation in sandstones.

Oye, Olakunle J. and Aplin, Andrew C. and Jones, Stuart J. and Gluyas, Jon G. and Bowen, Leon and Orland, Ian J. and Valley, John W. (2018) 'Vertical effective stress as a control on quartz cementation in sandstones.', Marine and petroleum geology., 98 . pp. 640-652.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
First Live Deposit - 19 September 2018
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.marpetgeo.2018.09.017
Publisher statement:© 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Record Created:19 Sep 2018 09:58
Last Modified:17 Sep 2019 01:04

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