Dolomitization of the Latemar platform: Fluid flow and dolomite evolution

Jacquemyn, Carl; Desouky, Hamdy El; Hunt, Dave; Casini, Giulio; Swennen, Rudy

doi:10.1016/j.marpetgeo.2014.01.017

Cited by 65 publications

(84 citation statements)

References 74 publications

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“…However in some cases, e.g. in the Latemar (Jacquemyn et al, 2014), the colour change marks the contact between Fe-rich and Fe-poor dolomites rather than the limestone to dolomite transition. In nature, fronts may thus appear sharper than the underlying mineralogical transitions, and the latter are not always quantitatively evaluated.…”

Section: Fault-controlled Dolomitisation and Htd Geobodiesmentioning

confidence: 99%

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

et al. 2017

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University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code:Effects of temperature and geological heterogeneity AbstractReactive transport simulations using our CSMP++GEM coupled code were applied to study the major controls on replacement dolomitisation and the development of dolomite geobodies in a hydrothermal setting. A series of 2D simulations show how elevated temperature and reactive surface area increase the rate of dolomitisation, and result in a dolomite replacement front that is both sharper and inclined at a higher angle from vertical. This inclination, an effect of gravity segregation, is apparent in thick homogeneous units, but in layered systems the lithological contrast determines the shape of the dolomite front. The increase in permeability resulting from porosity generation upon replacement of calcite by dolomite has a major effect on accelerating the overall progress of dolomitisation. In contrast, the changes in fluid density due to chemical reactions and the pressure dependence of thermodynamic data have a minor influence under simulated conditions. Primary dolomite forms slowly after complete replacement of host calcite, leading to porosity decrease, and is only locally important around the source of the hydrothermal fluid.For a simple layered system, our model results are in excellent agreement * Corresponding author. Present address: ETH Zurich, Institute of Geochemistry and Petrology. E-mail address: alina.yapparova@gmail.comPreprint submitted to Chemical Geology July 6, 2017with those obtained using TOUGHREACT code. They do, however, show the advantage of unstructured triangular over structured rectangular meshes for resolving complex curved/inclined front shapes. Such meshes also offer benefits in simulating fault-controlled hydrothermal dolomitisation. Our simulations predict dolomite geobodies comparable in scale and morphology to natural examples documented at outcrops, and underline the importance of understanding the permeability structure within and around the fault zone.

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Section: Fault-controlled Dolomitisation and Htd Geobodiesmentioning

confidence: 99%

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

et al. 2017

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“…Emplacement of the intrusion was coupled with emplacement of numerous north-northwest to south-southeast oriented dikes across the Latemar platform (Riva and Stefani, 2003). High-permeability brecciated zones along the dikes served as pathways for dolomitizing fluids that consequently caused (partial) dolomitization of the Latemar platform (Jacquemyn et al, 2014). Replacement dolomitization started during or shortly after dike emplacement.…”

Section: Geological Settingmentioning

confidence: 99%

“…Since then, he has been specializing in evaluation, characterization, and modeling of naturally fractured reservoirs, fracture development in foreland fold-andthrust belts, application of virtual outcrop technologies to fracture characterization, and modeling in carbonate systems. control in the Latemar platform has already been discussed in the literature (Wilson et al, 1990;Ferry et al, 2011;Jacquemyn et al, 2014). A genetic link between dolomite and dikes has been uncovered Jacquemyn et al, 2014), however the geometric description of dolomite occurrences was limited and was mostly in generic terms (e.g., dolomite mushroom in Wilson et al, 1990; dolomite fingers, sheets, and pipes in .…”

Section: Introductionmentioning

confidence: 99%

“…control in the Latemar platform has already been discussed in the literature (Wilson et al, 1990;Ferry et al, 2011;Jacquemyn et al, 2014). A genetic link between dolomite and dikes has been uncovered Jacquemyn et al, 2014), however the geometric description of dolomite occurrences was limited and was mostly in generic terms (e.g., dolomite mushroom in Wilson et al, 1990; dolomite fingers, sheets, and pipes in . The complex, often steep, outcrop morphology does not allow straightforward observation and generic description of dolomite bodies and their distribution throughout the platform.…”

Section: Introductionmentioning

confidence: 99%

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Multi-scale three-dimensional distribution of fracture- and igneous intrusion- controlled hydrothermal dolomite from digital outcrop model, Latemar platform, Dolomites, northern Italy

Jacquemyn¹,

Huysmans²,

Hunt³

et al. 2015

Bulletin

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A B S T R A C TIn recent years, fracture-controlled (hydrothermal) dolomitization in association with igneous activity has gained interest in hydrocarbon exploration. The geometry and distribution of dolomite bodies in this setting are of major importance for these new plays. The Latemar platform presents a spectacularly exposed outcrop analogue for carbonate reservoirs affected by igneous activity and dolomitization.Light detection and ranging (LIDAR) scanning and digital outcrop models (DOMs) of outcrops offer a great opportunity to derive geometrical information. Only a few analysis methods exist to quantitatively assess huge amounts of georeferenced threedimensional lithology data. This study presents a novel quantitative approach to describe three-dimensional spatial variation of lithology derived from DOMs. This approach is applied to the Latemar platform to determine dolomite body geometry and distribution in relation to crosscutting dikes.A high-resolution photorealistic DOM of the Latemar platform allows description of dolomite occurrences in three dimensions, with high precision at platform scale. This results in a unique lithology dataset of limestone, dolomite, and dike positions. This dataset is analyzed by true three-dimensional variography for the geospatial description of dolomite distribution. In most

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“…Geochemical data, combined with petrography, can reveal the origin and evolution of the dolomitizing fluid (Allan and Wiggins, 1993;Jacquemyn et al, 2014). The mean d 18 O value of type-D2 dolomite (À6.23‰) is slightly higher than that of the limestone counterpart (À7.08‰).…”

Section: Origin Of Type-d2mentioning

confidence: 99%

Origin of dolomite in the third member of Feixianguan Formation (Lower Triassic) in the Jiannan area, Sichuan Basin, China

Wang

Hao

et al. 2015

Marine and Petroleum Geology

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Dolomitization of the Latemar platform: Fluid flow and dolomite evolution

Cited by 65 publications

References 74 publications

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

Multi-scale three-dimensional distribution of fracture- and igneous intrusion- controlled hydrothermal dolomite from digital outcrop model, Latemar platform, Dolomites, northern Italy

Origin of dolomite in the third member of Feixianguan Formation (Lower Triassic) in the Jiannan area, Sichuan Basin, China

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