Hydrothermal Dolomites in the Early Albian (Cretaceous) Platform Carbonates (NW Spain): Nature and Origin of Dolomites and Dolomitising Fluids

Shah, Mumtaz Muhammad; Nader, Fadi H.; García, Daniel; Swennen, Rudy; Ellam, Rob M.

doi:10.2516/ogst/2011174

Cited by 24 publications

(19 citation statements)

References 50 publications

(39 reference statements)

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“…), as commonly hypothesized for hydrothermal systems related to high‐temperature and shallow‐burial dolomitization (e.g. Davies & Smith, ; López‐Horgue et al ., ; Shah et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Basinal and evaporitic brines are commonly indicated as probable sources of highly saline fluids in hydrothermal systems (e.g. Davies & Smith, ; López‐Horgue et al ., ; Shah et al ., ; Lapponi et al ., ). Moreover, such brines are highly 18 O‐enriched, as are waters deriving from salt dissolution or gypsum dehydration (Hitchon & Friedman, ; Knauth & Beeunas, ).…”

Section: Discussionmentioning

confidence: 99%

“…The interaction with evaporite intervals is commonly invoked to explain the high salinity and d 18 O values of dolomitizing fluids (e.g. L opez-Horgue et al, 2010;Shah et al, 2012;Lapponi et al, 2014;Geske et al, 2015). Upper Triassic evaporites are present in the stratigraphic succession of the Maritime Alps (Lanteaume, 1968;Carraro et al, 1970).…”

Section: Characteristics and Origin Of Dolomitizing Fluidsmentioning

confidence: 99%

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Very hot, very shallow hydrothermal dolomitization: An example from the Maritime Alps (north‐west Italy–south‐east France)

et al. 2016

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In the Maritime Alps (NW Italy-SE France), the Middle Triassic-lowermost Cretaceous platform carbonates of the Provençal Domain locally show an intense dolomitization. Dolomitized bodies, irregularly shaped and variable in size from some metres to hundreds of metres, are associated with tabular bodies of dolomite-cemented breccias, cutting the bedding at a high angle, and networks of dolomite veins. Field and petrographic observations indicate that dolomitization was a polyphase process, in which episodes of hydrofracturing and host-rock dissolution, related to episodic expulsion of overpressured fluids through faults and fracture systems, were associated with phases of host-rock dolomitization and void cementation. Fluid inclusion analysis indicates that dolomitizing fluids were relatively hot (170-260 °C). The case study represents an outstanding example of a fossil hydrothermal system, which significantly contributes to the knowledge of such dolomitization systems in continental margin settings. The unusually favourable stratigraphic framework allows precise constraint of the timing of dolomitization (earliest Cretaceous), and, consequently, direct evaluation of the burial setting of dolomitization, which, for the upper part of the dolomitized succession, was very shallow or even close to the surface. The described large-scale hydrothermal system was probably related to deep-rooted

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“…), as commonly hypothesized for hydrothermal systems related to high‐temperature and shallow‐burial dolomitization (e.g. Davies & Smith, ; López‐Horgue et al ., ; Shah et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Characteristics and Origin Of Dolomitizing Fluidsmentioning

confidence: 99%

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Very hot, very shallow hydrothermal dolomitization: An example from the Maritime Alps (north‐west Italy–south‐east France)

et al. 2016

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“…This positive correlation between δ 18 O and Mg content in carbonates has been recognized elsewhere [e.g., Kralik et al ., ; Best et al ., ; Herrero et al ., ] but of special note is the exceptionally wide range of δ 18 O values (Δ > 21‰) at Minna Bluff (Table ). Documented cases for comparison include δ 18 O values of hydrothermally altered platform carbonates from northwestern Spain that vary by ∼ 10‰ [ Shah et al ., ]. Also, carbonates found within hydrothermally altered lavas from the Kerguelen Archipelago [ Renac et al ., ] have nearly as wide a range but are slightly heavier (δ 18 O = 8.7 to 27.4‰) and have much lighter δ 13 C values (−11.69 to 0.68‰), relative to the carbonates from Minna Bluff.…”

Section: Resultsmentioning

confidence: 99%

Alteration of volcaniclastic deposits at Minna Bluff: Geochemical insights on mineralizing environment and climate during the Late Miocene in Antarctica

Antibus

Panter

Wilch

et al. 2014

Geochem Geophys Geosyst

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Secondary minerals in volcaniclastic deposits at Minna Bluff, a 45 km long peninsula in the Ross Sea, are used to infer processes of alteration and environmental conditions in the Late Miocene. Glassy volcaniclastic deposits are altered and contain phillipsite and chabazite, low to high-Mg carbonates, chalcedony, and clay. to 43 C) and stability of zeolites in geothermal systems (>10 to $100 C).The alteration was a result of isolated, ephemeral events involving the exchange between heated meteoric water and glass during or soon after the formation of each deposit. Near-surface evaporative distillation can explain 18 O-enriched compositions for some Mg-rich carbonates and chalcedony. The d 18 O water calculated for carbonates (215.8 to 222.9&) reveals a broad change, becoming heavier between $12 and $7 Ma, consistent with a warming climate. These findings are independently corroborated by the interpretation of Late Miocene sedimentary sequences recovered from nearby sediment cores. However, in contrast to a cold-based thermal regime proposed for ice flow at core sites, wet-based conditions prevailed at Minna Bluff; a likely consequence of high heat flow associated with an active magma system.

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“…Over the last 25 years, there has been an escalating focus on structurally controlled hydrothermal dolomite (HTD) reservoirs globally (Davies et al, 2006). The hydrothermal fluids replacement of limestone strata has been reported from Miocene strata in the Tepusquet region and Ordovician strata in Wisconsin arch of United States (Malone et al,1996;Luczaj et al, 2006), Pliocene strata in the Izu Peninsula of Japan (Matsumoto et al,1988), Silurian strata in the Quebec region of Canada (Lavoie et al, 2004), Jurassic strata of Southern Alps region in Italy (Cervato et al, 1990;Ronchi et al, 2012), Lower Palaeozoic strata of Northern Spain and Cretaceous strata of Iraq (Shah et al, 2012;Lapponi et al, 2013;Zhang Tao et al, 2015). The HTD reservoirs now has become the important targets for oil and natural gas exploration in limestone stratum of North America (Lonnee and Machel, 2007), Canada (Qing et al,1992;Conliffe et al, 2009;Lavoie et al, 2010), and West Asia (Nurkhanuly et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

A Model of Hydrothermal Dolomite Reservoir Facies in Precambrian Dolomite, Central Sichuan Basin, SW China and its Geochemical Characteristics

Zhou

Jiang

et al. 2019

Acta Geologica Sinica (Eng)

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Hydrothermal mineral assemblages and related hydrothermally enhanced fracturing are common in the Precambrian Dengying Formation of Central Sichuan Basin. Petrographic and geochemical analyses of core samples show that the hydrothermal dolomite reservoirs of Dengying Formation consist of four main types of pores in the reservoir facies. These include: 1) hydrothermal dissolution vug (or pore), 2) intercrystalline pore, 3) residual inter-breccia vug (or pore), and 4) enlarged dissolved-fracture. There are three different fabrics dolomite in hydrothermal dolomite reservoirs, namely, saddle dolomite, fine-medium dolomite and micritic dolomite. Micritic dolomite is the original lithology of host rock. Saddle dolomite with curved or irregular crystal faces was directly crystallized from hydrothermal fluids (average temperature 192°C). Fine-medium dolomites are the products of recrystallization of micritic dolomite, resulting in abnormal geochemical characteristics, such as slight depletion of δ 18 O, significant enrichment of Mn-Fe and 87 Sr/ 86 Sr, and positive Eu anomaly. A model for the distribution of various hydrothermal dolomite reservoir facies is proposed here, which incorporates three fundamental geological controls: 1) extensional tectonics and tectono-hydrothermal events (i.e., the Xingkai Taphrogenesis of Late Sinian-Early Cambrian, and Emei Taphrogenesis of Late Permian), 2) hydrothermal fluid storage in clastic rocks with large thickness (e.g., Nanhua System of Chengjiang Formation and part of Doushantuo Formation), and 3) confining bed for hydrothermal fluids (such as, the shale in Qiongzhusi Formation). The supply of hydrothermal fluid is critical. Large basement-rooted faults and associated grid-like fracture system may function as the channels for upward migration of hydrothermal fluid flow. The intersection of the above-mentioned faults (including the conversion fault), especially transtensional sags above negative flower structures on wrench faults can serve as a key target for future hydrocarbon exploration.

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Hydrothermal Dolomites in the Early Albian (Cretaceous) Platform Carbonates (NW Spain): Nature and Origin of Dolomites and Dolomitising Fluids

Cited by 24 publications

References 50 publications

Very hot, very shallow hydrothermal dolomitization: An example from the Maritime Alps (north‐west Italy–south‐east France)

Very hot, very shallow hydrothermal dolomitization: An example from the Maritime Alps (north‐west Italy–south‐east France)

Alteration of volcaniclastic deposits at Minna Bluff: Geochemical insights on mineralizing environment and climate during the Late Miocene in Antarctica

A Model of Hydrothermal Dolomite Reservoir Facies in Precambrian Dolomite, Central Sichuan Basin, SW China and its Geochemical Characteristics

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