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The dolostone units of the Beekmantown Group in the Montreal area contain multiple generations of dolomite. Early replacement dolomite was followed by late replacement dolomite, pore-filling dolomite, pore-filling quartz, and pore-filling calcite. Homogenization temperatures of aqueous fluid inclusions increased from late replacement dolomite (110–118°C) and early pore-filling dolomite (98–101°C) to late pore-filling dolomite (158–169°C), and then decreased during precipitation of quartz (101–142°C) and calcite (121–135°C). The fluids show very high salinities (17–32 wt.% NaCl equivalent). Solid bitumen coats open pores, postdates late replacement and/or early pore-filling dolomite, and predates late pore-filling dolomite and quartz. Methane inclusions are entrapped in the quartz cement. It is suggested that the dolostone units of the Beekmantown Group may have been charged with liquid hydrocarbons before maximum burial, which were then transformed to gaseous products by overheating with increasing burial. The dolostone units were porous and could have been reservoirs for gaseous hydrocarbons until some time after the maximum burial, when much of the porosity was occluded by calcite cement. 1 Contribution to the Appalachian Foreland and St. Lawrence Platform Architectures in Quebec, New Brunswick and Newfoundland NATMAP Project 1 Resume : Les dolomies du Groupe de Beekmantown dans la region de Montreal renferment de multiples generations de dolomite. A de la dolomite de remplacement precoce, succedent de la dolomite de remplacement tardive, des dolomites de remplissage de porosite precoce et tardive, du quartz de remplissage de porosite et, enfin, de la calcite de remplissage de porosite. Les temperatures d’homogeneisation des inclusions fluides aqueuses augmentent en passant de la dolomite de remplacement tardive (110-118 °C) et de la dolomite de remplissage de porosite precoce (98-101 °C) a la dolomite de remplissage de porosite tardive (158-169 °C), pour diminuer par la suite lors de la precipitation du quartz (101-142 °C) et de la calcite (121-135 °C). Les fluides sont caracterises par des salinites elevees (17-32 % eq. poids NaCl). Du bitume recouvre les parois des pores ouverts et est posterieur a la dolomite de remplacement tardive ou a la dolomite de remplissage de porosite precoce, mais anterieur a la dolomite de remplissage de porosite tardive et au quartz. Des inclusions a methane sont serties dans le ciment de quartz. Il est suggere que les dolomies du Groupe de Beekmantown etaient chargees d’hydrocarbures liquides avant l’enfouissement maximal, mais que ceux-ci ont ete transformes en gaz lors de la surchauffe associee a l’augmentation de la profondeur d’enfouissement. Les dolomies etaient poreuses et ont pu agir comme reservoirs de gaz naturel pendant un certain temps apres l’enfouissement maximal, jusqu’a ce que la majeure partie de la porosite ait ete colmatee par le ciment de calcite.

Dolostone units of the Beekmantown Group in the Montreal area, Quebec: diagenesis and constraints on timing of hydrocarbon activities