Carboniferous nautiloids and the bathymetry of Waulsortian limestones in Ireland

Histon, Kathleen; Sevastopulo, George D.

doi:10.1016/s0016-7878(08)80016-8

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Locally, thickness may be fault controlled (Jones et al, 1988). Waulsortian banks display four depthphases, distinguished on the basis of skeletal and non-skeletal components, ranging from deep (300 m) to comparatively shallow (within the photic zone; Lees & Miller, 1995; see also Histon & Sevastopulo, 1993;Bridges et al, 1995).…”

Section: Waulsortian Limestonementioning

confidence: 99%

Dolomitization of the Waulsortian Limestone (Lower Carboniferous) in the Irish Midlands

Gregg¹,

Shelton²,

Johnson³

et al. 2001

Sedimentology

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The Waulsortian Limestone (Lower Carboniferous) of the southern Irish Midlands is dolomitized pervasively over a much larger region than previous studies have documented. This study indicates a complex, multistage, multiple fluid history for regional dolomitization. Partially and completely dolomitized sections of Waulsortian Limestones are characterized by finely crystalline (0·01–0·3 mm) planar dolomite. Planar replacive dolomite is commonly followed by coarse (≥0·5 mm) nonplanar replacive dolomite, and pervasive void‐filling saddle dolomite cement is frequently associated with Zn–Pb mineralization. Planar dolomite has average δ18O and δ13C values (‰ PDB) of –4·8 and 3·9 respectively. These are lower oxygen and slightly higher carbon isotope values than averages for marine limestones in the Waulsortian (δ18O=–2·2, δ13C=3·7). Mean C and O isotope values of planar replacive dolomite are also distinct from those of nonplanar and saddle dolomite cement (–7·0 and 3·3; –7·4 and 2·4 respectively). Fluid inclusions indicate a complex history involving at least three chemically and thermally distinct fluids during dolomite cementation. The petrography and geochemistry of planar dolomites are consistent with an early diagenetic origin, possibly in equilibrium with modified Carboniferous sea water. Where the Waulsortian was exposed to hydrothermal fluids (70–280 °C), planar dolomite underwent a neomorphic recrystallization to a coarser crystalline, planar and nonplanar dolomite characterized by lower δ18O values. Void‐filling dolomite cement is isotopically similar to nonplanar, replacive dolomite and reflects a similar origin from hydrothermal fluids. This history of multiple stages of dolomitization is significantly more complex than earlier models proposed for the Irish Midlands and provides a framework upon which to test competing models of regional vs. localized fluid flow.

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Section: Waulsortian Limestonementioning

confidence: 99%

Dolomitization of the Waulsortian Limestone (Lower Carboniferous) in the Irish Midlands

Gregg¹,

Shelton²,

Johnson³

et al. 2001

Sedimentology

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“…The Waulsortian banks formed on the outer platform and basin in tropical latitudes from depths of several hundred meters (subphotic) to relatively shallow photic environments (Lees and Miller, 1995). In Ireland, the top of the mud bank has been interpreted as being deposited at a depth between 65–170 m using cephalopod evidence (Histon and Sevastopulo, 1993). Conodont samples from Waulsortian carbonate facies show low diversity and abundance, but V .…”

Section: Discussionmentioning

confidence: 99%

The apparatus of the Carboniferous conodont Vogelgnathus simplicatus and the early evolution of the genus

2018

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The apparatus of Vogelgnathus simplicatus (Rhodes, Austin, and Druce, 1969) is reconstructed from discrete elements from a sample of limited diversity from the Limerick Province (Ireland). The apparatus is typical of the order Ozarkodinida and the P1 element was previously placed within Gnathodus. Here we assign it to Vogelgnathus by applying a multielemental concept rather than using P1 element morphology. The holotype and paratypes are re-illustrated and the species distribution revised based on published data. Vogelgnathus simplicatus ranges from the late Tournaisian to the early Viséan (Mississippian, Carboniferous), with common occurrences relating to the growth of Waulsortian bank complexes in a high-stand sea-level along the southern and western margins of the Laurussian landmass (Belgium, the British Isles, the Republic of Ireland, and USA). Vogelgnathus simplicatus appears to represent the rootstock from which deep-water and shallow-water Viséan species of Vogelgnathus evolved in the Mississippian.

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“…1). As far as O. affine Meneghini 1857 (previously O. affine Portlock 1843), is concerned, as reported in the Engeser's Internet page, it must be noted that Histon (1997) and Histon & Sevastopulo (1993) taxonomically revised this Irish Lower Carboniferous species as Mitorthoceras affine (Portlock).…”

Section: Remarks and Family Revisionmentioning

confidence: 95%

Some remarks and emendation of the Family Ariooceratidae Dzik 1984 (Cephalopoda, Nautiloidea)

Gnoli¹

1998

Palaeontologia Electronica

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Carboniferous nautiloids and the bathymetry of Waulsortian limestones in Ireland

Cited by 6 publications

References 8 publications

Dolomitization of the Waulsortian Limestone (Lower Carboniferous) in the Irish Midlands

Dolomitization of the Waulsortian Limestone (Lower Carboniferous) in the Irish Midlands

The apparatus of the Carboniferous conodont Vogelgnathus simplicatus and the early evolution of the genus

Some remarks and emendation of the Family Ariooceratidae Dzik 1984 (Cephalopoda, Nautiloidea)

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