Mixing-Zone Diagenesis in the Subsurface of Florida and the Bahamas

Melim, Leslie A.; Swart, Peter K.; Eberli, Gregor P.

doi:10.1306/042904740904

Cited by 102 publications

(65 citation statements)

References 69 publications

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“…However numerous authors have shown that thick bodies of dolomite are unlikely to form in mixing zones (Machel and Mountjoy, 1986;Hardie, 1987), with recent examples of mixing zone dolomites confined to isolated regions with limited extent (Melim et al, 2004). Figure 7 shows that the d 18 O of D1 dolomite of the Port au Port Peninsula fall within the range calculated for Arenig seawater.…”

Section: Early Dolomitization (D1 To Ds)mentioning

confidence: 61%

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Dolomitization of the lower Ordovician Catoche formation: Implications for hydrocarbon exploration in western Newfoundland

Conliffe

Azmy

Greene

2012

Marine and Petroleum Geology

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Section: Early Dolomitization (D1 To Ds)mentioning

confidence: 61%

“…D1 dolomitization on the Port aux Choix Peninsula may be related to the formation of seawatermeteoric water mixing zones during exhumation. However mixing zone dolomitization was restricted to isolated regions with limited extent, similar to modern mixing zone environments (Melim et al, 2004).…”

Section: Early Dolomitization (D1 To Ds)mentioning

confidence: 80%

Dolomitization of the lower Ordovician Catoche formation: Implications for hydrocarbon exploration in western Newfoundland

Conliffe

Azmy

Greene

2012

Marine and Petroleum Geology

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“…4) and the lack of massive gypsum/anhydrite suggest that the type 1 dolomite formed from penesaline seawater in a near-surface environment, with magnesium ions provided by a combination of high-and low-frequency sea-level changes (Qing et al 2001). The development of dolomite in a zone of mixed meteoric and marine water has been questioned and considered to be unlikely by many researchers (Hardie 1987;Melim et al 2004). A mixed water process for dolomitization is not consistent with the type 1 dolomite, particularly because the dolomite strata in the Ma 5 5 submember are generally approximately horizontal rather than present as lenses (as in the mixing zone model) or related to unconformities.…”

Section: Stratigraphic Constraintsmentioning

confidence: 99%

Origin of dolomite in the Middle Ordovician peritidal platform carbonates in the northern Ordos Basin, western China

et al. 2016

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The carbonates in the Middle Ordovician Ma 5 5 submember of the Majiagou Formation in the northern Ordos Basin are partially to completely dolomitized. Two types of replacive dolomite are distinguished: (1) type 1 dolomite, which is primarily characterized by microcrystalline (\30 lm), euhedral to subhedral dolomite crystals, and is generally laminated and associated with gypsumbearing microcrystalline dolomite, and (2) type 2 dolomite, which is composed primarily of finely crystalline (30-100 lm), regular crystal plane, euhedral to subhedral dolomite. The type 2 dolomite crystals are truncated by stylolites, indicating that the type 2 dolomite most likely predated or developed simultaneously with the formation of the stylolites. Stratigraphic, petrographic, and geochemical data indicate that the type 1 dolomite formed from near-surface, low-temperature, and slightly evaporated seawater and that the dolomitizing fluids may have been driven by density differences and elevation-related hydraulic head. The absence of massive depositional evaporites in the dolomitized intervals indicates that dolomitization was driven by the reflux of slightly evaporated seawater. The d 18 O values (-7.5 to -6.1 %) of type 1 dolomite are slightly lower than those of seawaterderived dolomite, suggesting that the dolomite may be related to the recrystallization of dolomite at higher temperatures during burial. The type 2 dolomite has lower d 18 O values (-8.5 to -6.7 %) and Sr 2? concentration and slightly higher Na ? , Fe 2? , and Mn 2? concentrations and 87 Sr/ 86 Sr ratios (0.709188-0.709485) than type 1 dolomite, suggesting that the type 2 dolomite precipitated from modified seawater and dolomitic fluids in pore water and that it developed at slightly higher temperatures as a result of shallow burial.

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“…How ever, the study of Melim et al (2004) of mix ing-zone diagenesis combined with a crit i cal ex am i na tion of lit er a ture data ad vo cates rejec tion of the mix ing-zone dolomitisation model. Dolo mites of the Zechstein Main Do lo mite (sandwiched be tween evaporites - Fig.…”

mentioning

confidence: 99%

Polyphase dolomitization of the Wuchiapingian Zechstein Limestone (Ca1) isolated reefs (Wolsztyn Palaeo-Ridge, Fore-Sudetic Monocline, SW Poland)

Jasionowski

Peryt

Durakiewicz

2014

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Mixing-Zone Diagenesis in the Subsurface of Florida and the Bahamas

Cited by 102 publications

References 69 publications

Dolomitization of the lower Ordovician Catoche formation: Implications for hydrocarbon exploration in western Newfoundland

Dolomitization of the lower Ordovician Catoche formation: Implications for hydrocarbon exploration in western Newfoundland

Origin of dolomite in the Middle Ordovician peritidal platform carbonates in the northern Ordos Basin, western China

Polyphase dolomitization of the Wuchiapingian Zechstein Limestone (Ca1) isolated reefs (Wolsztyn Palaeo-Ridge, Fore-Sudetic Monocline, SW Poland)

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