Calcareous sinter
{{Short description|Freshwater calcium carbonate deposit}}
Calcareous sinter is a freshwater calcium carbonate deposit, also known as calc-sinter. Deposits are characterised by low porosity and well-developed lamination, often forming crusts or sedimentary rock layers. Calcareous sinter should not be confused with siliceous sinter, which the term sinter more frequently{{citation needed|date=December 2021}} refers to. It has been suggested{{by who|date=March 2018}} that the term "sinter" should be restricted to siliceous spring deposits and be dropped for calcareous deposits entirely.
Features
Calcareous sinter is characterised by laminations of prismatic crystals growing perpendicular to the substrate; laminations are separated by thin layers of microcrystalline carbonate.Flügel, E. 2004. Microfacies of Carbonate Rocks. Germany: Spring-Verlag. {{ISBN|3-540-22016-X}} Calcareous sinter is porous due to the calcareous crystals enclosing many small cavities.{{Cite web|url=https://www.britannica.com/science/sinter|title = Sinter | mineral}} Macrophytes are absent, consequently porosity is very low. Exclusion of species is due either to high temperature (travertine), high pH/ionic strength (tufa) or absence of light (speleothems).
Pedley (1990)Pedley, H.M. 1990. Classification and environmental models of cool freshwater tufas. Sedimentary Geology 68, pp. 143-154. suggests the term be abandoned in favour of tufa for ambient temperature deposits. This avoids any potential confusion with siliceous sinter and prevents deposits formed in different environmental conditions (hot spring deposits, cold spring deposits and speleothems are all lumped together under the term sinter) from being amalgamated into one group.
Geochemistry
Deposits are formed from either calcite or aragonite. Precipitation is brought about by degassing of CO2, which decreases the solubility of calcite/aragonite. (See tufa/geochemistry)
Notable deposits
Gallery
Image:Kalksinter.JPG|Pure calc sinter, typical for aqueducts and all kinds of water facilities.
Image:Eifelwasserleitung05.jpg|Roman aqueduct in Germania Inferior. Eifel Aqueduct, clogged by fine sinter.
Image:Travertine-mound_Bridgeport_CA.jpg|Deposits of several thousand years of calc sinter (travertine) in the Bridgeport, California Hot Springs
Medieval extraction and use
Image:Eifelmarmor01.jpg in Bad Münstereifel church in Germany]]
The build-up of calc-sinter material in the Eifel Aqueduct was commercially exploited in the 11th and 12th centuries. With deposits up to {{convert|30|cm|in}} thick, the material was cut into vertical columns of polished brown rock with impressive layered patterns, which made it much in demand by cathedral builders across large parts of central Europe and beyond.{{cite book| author=Tegethoff, F. Wolfgang| author2=Rohleder, Johannes| author3=Kroker, Evelyn |url=https://books.google.com/books?id=pbkKGa19k5QC&q=%22eifel+aqueduct%22&pg=PA93 | title=Calcium Carbonate: From the Cretaceous Period Into the 21st Century| publisher= Birkhäuser| year=2001| isbn=3-7643-6425-4}} In England it was used to provide polychromy, contrasting with the pale limestone favoured by Norman English Cathedrals. The stone was for many years known as 'Onyx Marble' despite being very obviously neither onyx nor marble. Those studying the stonework at Canterbury Cathedral were unaware of its origins in the aqueduct until 2011.{{cite book| author=C. Wilson|year=2015| chapter=Canterbury Cathedral’s Mystery “Marble”: A Double Imposture Unmasked’| pages=156–60| editor= P. Fergusson| title=Canterbury Cathedral Priory in the Age of Becket | location=New Haven and London}} Such large-scale use as the cloisters around a cathedral quadrangle needed many hundreds of columns, which must have been supplied by a well-organised extraction and transport operation. The Eifel deposits, have also been identified at Rochester{{cite journal| author=John McNeill| title=The Romanesque Cloister in England| journal=Journal of the British Archaeological Association| volume=168 |year=2015|pages=34–76| url=https://www.academia.edu/19984110| doi=10.1179/0068128815Z.00000000038| s2cid=194154048}} and in the now lost Romanesque cloister at Norwich{{cite journal|author= R.B. Harris| title=Reconstructing the Romanesque Cloister of Norwich Cathedral| year=2019| journal=The Antiquaries Journal| publisher=Cambridge University Press| volume=99|pages=133–159| doi=10.1017/S0003581519000118| s2cid=203298501}} as well as the Infirmary Cloister, Chapter House windows, Anselm Chapel door and the Treasury gateway at Canterbury.{{cite web|url=http://www.canterbury-archaeology.org.uk/stones-calc/4594124807| title=calc-sinter or Onyx Marble| author=Geoff Downer|year=2019|website=canterbury-archaeology.org.uk| publisher=Canterbury Historical & Archaeological Society (CHAS)}}
See also
References
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