Has Burial Dolomitization Come of Age? Some Answers from the Western Canada Sedimentary Basin

Mountjoy, Eric W.; Amthor, Joachim E.

doi:10.1002/9781444304077.ch13

Cited by 46 publications

(36 citation statements)

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“…The Chouane Member is made up of a medium-to coarse-grained dolostone, which was the result of a massive replacement of the original carbonate mud under shallow to intermediate burial conditions (cf. Amthor et al 1993;Mountjoy and Amthor 1994;Drivet and Mountjoy 1997;Machel 1999). The dolostone consists of euhedral rhombic dolomite crystals ranging from 0.5 to 1 mm across.…”

Section: Petrographymentioning

confidence: 92%

Characterization of the Lebanese Jurassic–Cretaceous carbonate stratigraphic sequence: a geochemical approach

Abdel-Rahman

Nader

2002

Geological Journal

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The Lebanese crustal segment is part of a much larger carbonate platform deposited along the northwestern margin of the Arabian Plate, in the eastern Mediterranean region. It is made up mainly of Jurassic–Cretaceous carbonate rocks. Most of this stratigraphic sequence is exposed in the Nahr Ibrahim canyon and surrounding areas in central Lebanon. The various formations, from the oldest unit (the Lower Jurassic Kesrouane Formation) to the Upper Cretaceous Chekka Formation, are made up of different types of carbonate rocks including micritic limestone, medium‐ to coarse‐grained dolostone, biomicritic (chalk), biosparrudite limestone, micritic dolostone, pelmicrite, marl and marly limestone.Results of this first chemical investigation on the Lebanese carbonate platform show that the micritic limestone of the Kesrouane Formation is relatively enriched in Ca, Na and Sc, and has low rare‐earth element (REE) contents. The marl units of the Hammana Formation are enriched in Al, Fe, K, Ti, Rb, Ga, Nb, U, Th and REE. The chalk of the Chekka Formation shows the highest phosphorus content. A significant increase in P and Sr contents with time (from the Lower Jurassic to the Upper Cretaceous carbonate units) characterizes the Lebanese sequence; this is interpreted to be related to a possible increase in continental weathering rates during the Mesozoic. Enrichment in Ni, Ti and Nb in some formations is interpreted to be linked to Mesozoic volcanism in central Lebanon. The Cretaceous formations are subdivided according to their REE patterns into two distinct groups: limestones (Mdairej, Sannine and Maameltain formations) which are depleted in REE; and marl/chalk (Hammana and Chekka formations) which are significantly enriched in REE. On several geochemical variation diagrams, such as the K–Ti–P triangular plot, the Lebanese Mesozoic carbonate formations are found to occupy distinct compositional fields. Thus, carbonate geochemistry could prove to be a powerful tool (especially when combined with petrographic data) in characterizing and correlating carbonate formations (chemical stratigraphy), particularly in regions where field evidence may be limited. Results of this study have significant implications for the entire carbonate platform that covers a large part of the eastern Mediterranean region. Copyright © 2002 John Wiley & Sons, Ltd.

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Section: Petrographymentioning

confidence: 92%

Characterization of the Lebanese Jurassic–Cretaceous carbonate stratigraphic sequence: a geochemical approach

Abdel-Rahman

Nader

2002

Geological Journal

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“…Few of our sequences have experienced temperatures above 150 C, but studies in the Western Canada Basin (e.g. Qing and Mountjoy, 1994;Mountjoy and Amthor, 1994) and elsewhere (e.g. Negga et al, 1986;Freiberger et al, 2001) show that dolomites can form at much higher temperatures (above 200 C).…”

Section: Burial Dolomitementioning

confidence: 97%

“…These latter types of dolomites are likely to have formed in a series of environments not just as a result of late stage, exotic cementation. For example, in the Western Canada Basin, dolomites formed from seawater or during shallow burial were modified during deeper burial as well as some being directly precipitated during burial (Mountjoy and Amthor, 1994).…”

Section: Burial Dolomitementioning

confidence: 99%

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The relationship between petroleum, exotic cements and reservoir quality in carbonates – A review

Neilson

Oxtoby

2008

Marine and Petroleum Geology

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“…It is commonly difficult to distinguish these replacement dolomite crystals from those dolomite crystals that developed by the process of neomorphism of in the early stages of dolomitization (Zenger and Dunham 1988). Formation of coarse-crystalline dolomites may occur as a replacement of limestone during late diagenesis in the deep subsurface (Machel and Anderson 1989;Mountjoy and Amthor 1994), and this process may be controlled by the coarse-grained texture of the original deposits that are being replaced during late diagensis (Sibley et al 1993). …”

Section: Figurementioning

confidence: 99%

Diagenesis and geochemistry of the Aptian dolomite (cretaceous) in the Razzak Oil Field, western Desert, Egypt

Rifai

Kolkas

Holail

et al. 2006

Carbonates Evaporites

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Petrographic study of selected thin sections from the Aptian dolomites in the Razzak Oil Field, Egypt reveals three dolomite textures. These textures have been classified based on crystal size, shape, uniformity, and trace element distribution. These textures are as follows: I) finely crystalline, planar-e dolomite, 2) medium to coarsely crystalline, non-planar dolomite, and 3) very coarsely crystalline, non-planar dolomite (saddle dolomite). Stable isotope analyses indicates that the Aptian dolomites formed in a marine environment and were later subjected to several diagenetic modifications that affected the original sediments. The finely crystalline, planar-e dolomite is penecontemporaneous in origin with 8 18 0 that ranges from -7.51 to -8.14%0VPDB and 8 lJ e that ranges from +0.39 to -1.27%0 VPDB. The medium to coarsely crystalline, non-planar dolomite is a replacement type with a meteoric origin. In this non-planar dolomite, the 1) 18 0 ranges from -7.99 to -8.82%0 VPDB and the o l3e ranges from -0.58 to -1.35%0VPDB. The void-filling (saddle dolomite) is the product of chemical compaction and is associated with the thermal sulfate reduction event. This saddle dolomite has 8 18 0 that ranges from -7.89 to -8.76%0 VPDB and 8 1lC that ranges from + 1.41to +2.42%0 VPDB. The diagenetic parasequence ofthe Aptian Dolomite is recorded by: I) deposition of the original sediments (lime mud); 2) dolomitization; 3) silicification, 4) pyritization, and 5) precipitation of saddle dolomites (pore-filling dolomite).

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Has Burial Dolomitization Come of Age? Some Answers from the Western Canada Sedimentary Basin

Cited by 46 publications

References 0 publications

Characterization of the Lebanese Jurassic–Cretaceous carbonate stratigraphic sequence: a geochemical approach

Characterization of the Lebanese Jurassic–Cretaceous carbonate stratigraphic sequence: a geochemical approach

The relationship between petroleum, exotic cements and reservoir quality in carbonates – A review

Diagenesis and geochemistry of the Aptian dolomite (cretaceous) in the Razzak Oil Field, western Desert, Egypt

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