A diagenetic study of dolostone of the Lower Ordovician Romaine Formation, Anticosti Island, Quebec

This study deals with the diagenetic evolution of dolostone of the Romaine Formation, Anticosti Island. Four types of calcite and six types of dolomite were distinguished. According to fluid-inclusion and C-O isotope data, sedimentary micrite, replacement calcite, and early pore-filling calcite were formed in sedimentary and early diagenetic environments. Early replacement dolomite phases were formed in an early burial environment. Later replacement dolomite and pore-filling dolomite as well as minor sphalerite were formed from warm, saline fluids interpreted to be of hydrothermal origin. Significant porosities were produced through dissolution of early replacement dolomite phases by these fluids. Intercrystal porosities were created in later replacement dolomite phases. The dissolution porosities were partly occluded by late-stage calcite, pyrite, and barite. Hydrocarbon inclusions were recorded in late-stage calcite and contemporaneous barite, indicating a hydrocarbon migration event after the porosity-generating processes. 2001-D17 G. Chi and D. Lavoie 1 CURRENT RESEARCH RECHERCHES EN COURS 2001 Article Article Titles Titres Purchase Information Information pour acheter 1 Contribution to the Appalachian Foreland and St. Lawrence Platform NATMAP Project