Talk:A-type granite

Evaluating the Article

LEAD: Granite needs to be distinguished from granitoid. ‘Alphabet’ classification was defined for granitoids, not granites. No definition provided for granite, however, a link to the wiki granite page would solve this. A brief description of the criteria that defines A-type from other types on is needed. The 4 other alphabet-types are appropriately listed here, as they will be used in the body to compare the attributes of A-types’ occurrence, geochemistry and sub-types to. In addition, the ‘alphabet’ classification of granite as aggregate should be credited to Chappel & White (1974), White (1979) and Loiselle & Wones (1979)

BODY: Adding Headings: Occurrence, Geochemistry and A-type Sub-types the content of the 2nd, 3rd, and 4th paragraphs would give the article more structure.

REFERENCES: Reference [1]: Nelson Eby’s web page is a U of Mass, Earth Science Prof, and hence a reliable source but none of the lines credited to this citation contain material supporting the citation. It is possible the wiki author may have been mental linking material from a lecture of Prof. Eby. The content is valid however all cited sentences accredited to this source need to be re-cited. Much of this material comes from the 3 original sources:

1. Chappell and White (1974) reprinted in - Chappell, B. W., White, A. J. R., 2001. Two contrasting granite types: 25 years later. Australian Journal of Earth Sciences 48, 489-499. As of today's date, I have only added to link to the wiki GRANITE web page but I would like to find the citations for the existing content and add the headings suggested above. Please let me know what you think of these edits as I don't want to hurt the feelings of the original author.

2. Loiselle, M. C., Wones, D. R., 1979. Characteristics and origin of anorogenic granites. Geological Society of America Abstracts with Programs 11, no. 7, 468.

3. White, A. J. R., 1979. Sources of granite magmas. Geological Society of America Abstracts with Programs 11, no. 7, 539. — Preceding unsigned comment added by ObliqueFault (talk • contribs) 02:19, 5 February 2021 (UTC) My apologies, I forgot to sign my comments ObliqueFault (talk) 02:35, 5 February 2021 (UTC)

Don't fear to change this @ObliqueFault:, my feelings will not be hurt by minor or major changes. It is more important to be correct and useful as an article. I have added headers as you suggest. Graeme Bartlett (talk) 03:08, 5 February 2021 (UTC)

Adding citations of known sources

Feb 11/2021: Citations were added for sentences where the content could be sourced. A new section titled Alphabet Classification System was added to leave the Lead section focused just on A-type class not the classification system itself.

The Lead section and second and third paragraphs were edited to better reflect the sentence context in the source. The Geochemistry, Subtypes and Source paragraphs were not edited with the exception of the addition of the citations.

Another wiki article relating to this topic: Granitoids, has a large void with respect to the various other types of Granitoid Classification systems. I would like to improve the Granitoid article by adding content on other Granitoid Classification Systems, such as those based on modal content [perluminous, peralkaline, metaluminous]; by depth [epizonal, mesozonal, catazonal]; by geochemistry; and by tectonic regime [OIBs, Continental Arc, Continental Collision, post-orogenic uplift/collapse, contineental rifting, hotspots and MORs and oceanic islandsSmall text]. Once this is completed, paragraphs 3 to 6 could be better correlated to how A-type characteristic differ or overlap the other SIAM-type granites.

I welcome any feedback from my edits. My goal is always to respect the work of earlier editors. ObliqueFault (talk) 05:31, 12 February 2021 (UTC)