Talk:Carbonatite

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Comment

Edited to include more detail on mineralogy and origin; naturally anyone who knows a bit about carbonatites knows they probably don't know much, so I have avoided a great deal of detail on these. I am sure there have been either sulphur lavas or carbonatite lavas erupted in Chile or Peru, as I saw a video of them at university from a visiting American professor, but I can't find a web link for them.

Oldoinyo Lengai

I changed "dominated by natrolithe and trona" to nyerereite and gregoryite (the former two only appear as alteration products). Riannek (talk) 14:05, 21 December 2009 (UTC)[reply]

Classification

Just had a talk from a Prof. who's main research area is Carbonatites. She stated that to be classed as a Carbonatite >50% carbonate material is required to be present. Currently the article states 20% however does not quote a source. I can't find a source to quote the 50% from as I don't have any of my igneous text books with me. ClimberDave 14:27, 15 October 2007 (UTC)[reply]

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Errors

The sentence "...natrolite, sodalite, apatite, magnetite, barite, fluorite, ancylite group minerals, and other rare minerals not found in more common igneous rocks" is obviously wrong. Natrolite is present in basalts (its voids); syenites; and other rocks. Sodalite - in some melilitolites, and sodalite-rich alkaline SILICATE rocks; "Apatite" (there is no such mineral; there is a group and supergroup of this name) is the most common phosphorus mineral found in a number of sedimentary rocks, granitoids, nepheline syenites, and others; magnetite - is skarns, basalts, some granitoids, some metasomatites, etc.; "barite" (there is no such mineral; the correct name is: baryte) is one of the main components of a number of hydrothermalites residing within geochemically variable lithologies (serpentinites included), also a common accessory mineral, e.g., in pyrometamorphics; fluorite - extremely common in hydrothermalites, greysens, some granitoids, syenite-related rocks, some pegmatites; ancylite group minerals: also in syenites. The listed minerals are absolutely not characteristic for carbonatites, maybe beside the ancylite group. The list should include gregoryite, nyerereite (for natrocarbonatites), pyrochlore-supergroup species, and some (additional) Sr-rich minerals.Eudialytos (talk) 20:31, 21 December 2019 (UTC)[reply]

Vague reference

The reference 13," Woolley & Church 2005, Woolley & Kjarsgaard 2008a, 2008b", is probably a bit too ambiguous.

Could it possibly refer to the following for the 2005 reference:

"Extrusive carbonatites: A brief review"
https://www.sciencedirect.com/science/article/abs/pii/S0024493705001064

And what about the 2008 reference. Is this it:

Carbonatite Occurrences of the World: Map and Database
https://ostrnrcan-dostrncan.canada.ca/entities/publication/c44a9799-edbb-4c64-aff3-2f6cc875fef6

There's supposedly 2 references in 2008, but can only find the map above.

I really don't have a clue to the validity of these references. I simply got fascinated by carbonatite volcanoes one weekend! Russetrob (talk) 11:00, 22 April 2024 (UTC)[reply]