Paleogeographic and diagenetic context of a baritic mineralization enclosed within Frasnian peri-reefal formations: Case history of the Chaudfontaine mineralization (Belgium)

Dejonghe, Léon; Boulvain, Frédéric

doi:10.1016/0169-1368(93)90003-h

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…7 K and L). Ba-calcite has been described as a product of early diagenesis (Dejonghe and Boulvain, 1993;Schroeder et al, 1997), which can affect foraminiferal carbonate (Lea and Boyle, 1993). Barite in seafloor crusts as well as high dissolved Ba concentration have been described in the LV area (Sen et al, 2019; and EDS analysis of foraminiferal shells show an initial possible precipitation of authigenic Ba-rich overgrowth.…”

Section: Foraminiferal Secondary Overgrowthmentioning

confidence: 99%

Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments

et al. 2020

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Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal oxygen and carbon stable isotope compositions ( 18 O,  13 C) from either planktonic specimens, benthic specimens or both. However, in seafloor regions promixal to high upward methane fluxes, such as where seafloor gas emission and shallow gas hydrate-bearing sediment occur, foraminiferal  18 O and  13 C display a wide range of values. Our study focuses on foraminiferal stable isotope signatures in shallow sediment at core sites in the Arctic affected by significant upward flow of methane. This includes cores with shallow sulfate methane transitions that are adjacent to seeps and containing gas hydrate.We place emphasis on potential effects due to gas hydrate dissociation and diagenesis. Gas hydrate dissociation is known to increase pore-water  18 O, but our results indicate that precipitation of methane-derived authigenic carbonate (MDAC) also affects the foraminiferal  18 O of both planktonic and benthic species. In addition to this post-depositional overprint, we investigate the potential bias of the stable isotope record due to ontogenetic effects. Our data show that the size fraction does not impact the isotopic signal of planktonic and benthic foraminifera.

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Section: Foraminiferal Secondary Overgrowthmentioning

confidence: 99%

Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments

et al. 2020

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“…Close to the continent, occasional restricted sedimentation conditions allowed the precipitation of evaporites (Rouchy et al. 1986; Dejonghe & Boulvain 1993).…”

Section: Geological Settingmentioning

confidence: 99%

Fluid evolution along multistage composite fault systems at the southern margin of the Lower Palaeozoic Anglo‐Brabant fold belt, Belgium

Dewaele¹,

Muchez²,

Banks³

2004

Geofluids

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Mineralised vein systems have been investigated at nine localities at the southern margin of the Anglo-Brabant fold belt in Belgium. During the late Silurian to early Middle Devonian Caledonian orogeny, shear zones formed, inferred to be associated with granitoid basement blocks in the subsurface. The circulation of a metamorphic fluid, possibly originating in the Cambrian core of the fold belt, along these shear zones resulted in the formation of mesozonal orogenic mineralisation at the southern margin of the Anglo-Brabant fold belt. The fluid had a composition dominated by H 2 O-CO 2 -X-NaCl-KCl. The shear zones form part of a greater fault zone, the Nieuwpoort-Asquempont fault zone, which is characterised by normal faulting that started before the Givetian and by the reactivation of the shear zones. Two fluid generations are associated with this normal faulting. First, a low salinity H 2 O-NaCl(-KCl) fluid migrated through the Palaeozoic rocks after the Silurian. Based on the isotopic composition, this fluid could be a late-metamorphic Caledonian fluid or a younger fluid that originated from the Rhenohercynian basin and interacted with Lower Devonian rocks along its migration path. Second, a high salinity H 2 O-NaCl-CaCl 2 fluid was identified in the fault systems. Similar fluids have been found in southern and eastern Belgium, where they produced Mississippi Valley-type Zn-Pb deposits. These fluids are interpreted as evaporative brines that infiltrated the Lower Palaeozoic basement, from where they were expelled during extensional tectonism in the Mesozoic.

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Zinc–lead deposits of Belgium

Dejonghe¹

1998

Ore Geology Reviews

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Paleogeographic and diagenetic context of a baritic mineralization enclosed within Frasnian peri-reefal formations: Case history of the Chaudfontaine mineralization (Belgium)

Cited by 6 publications

References 22 publications

Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments

Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments

Fluid evolution along multistage composite fault systems at the southern margin of the Lower Palaeozoic Anglo‐Brabant fold belt, Belgium

Zinc–lead deposits of Belgium

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