Talk:Granitoid

Wiki Education Foundation-supported course assignment

This article was the subject of a Wiki Education Foundation-supported course assignment, between 14 January 2021 and 11 April 2021. Further details are available on the course page. Student editor(s): ObliqueFault. Peer reviewers: Kyra Robertson, Morgan.b18.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 22:37, 16 January 2022 (UTC)

Article content suggestions

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) 05:15, 26 February 2021 (UTC) — Preceding unsigned comment added by ObliqueFault (talk • contribs) 06:12, 23 February 2021 (UTC)

Article Lead and Granitoid generalizations were improved

A new lead section fine-tuning the original article's definition of Granitoids and their distinction from granites was moving from my sandbox: User:ObliqueFault/sandbox-Granitoid-Adding content draft

A new section: Granitoid generalizations was also moved into the article main page but separated from the brief summary of the first paragraph. These 2 paragraphs form the article's Lead section as together they provide a good overall description of Granitoids. In the next adding content exercise, the various Systems of Granitoid Classification and what they convey to the understanding of particular Granitoids will be developed. However in this move-from-my-sandbox, they are only briefly described.ObliqueFault (talk) 00:53, 12 March 2021 (UTC)

Reporting at the end of my term as Student Editor for Granitoids

Tonight was my last day being the Student editor for granitoids. Last month, after the Lead section was rewritten and the granitoid generalizations section created, I hoped to develop the subtopics of the various classification for granitoids and what they individually reveal about granitoids. However, in researching and developing these subtopics, it was surprising to find the vast majority of authors interchange granitoids and granites throughout their papers. This is beyond confusing. More often than not, it is not possible to distinguish if an author's 'granitic rocks' is referring to granitoids or granites, therefore I am often making assumptions that the content applies to granitoids.

This made my distinction of the different granitoid classifications vs. that of granites given in the excellent wikipedia article on 'granites' seemed to me, to be evolving into a point of view. I realized very late in my writing that I am promoting this distinction and that my article has hence, lost it's neutrality.

To correct this, I have decided not to merge the Granitoid Classifications subsections and leave the article just the Lead section and the Granitoid Classifications. These stand alone to completely describe granitoids, as a broader term for granites. And the granite wikipedia article is linked. A good editor should know when to add and when to trim or delete, regardless of the time invested. The granitoid article is appropriate as it now.

However, I leave my 5 classification subtopics and their various classification system in the skeleton outline below. The Depth of Emplacement as a classification was not adequately covered in the the granite article, but to just include the section made the article unbalanced and the section an orphan.

Thank-you for this great experience ObliqueFault (talk) 09:40, 10 April 2021 (UTC)

Granitoid Classifications

Alphabet or S-I-A-M

I-type; S-type; M-type; A-type;

Geochemistry

Alumina saturation index: Availability of Al for feldspars;

isotopic signatures identifying tectonic regime,.[3][4][8][9]

Emplacement depth

Tabular intrusive bodies(sills, dikes, veins); Non-tabular bodies ( plutons); contact relationship; timing of intrusion; all leading to qualify how Depth of Intrusion: epizonal, mesozonal, and catazonal classification[10] describes granitoid attributes

Tectonic regime

granitoids are predominately formed by partial melting of silicic crust and minorly by partial meting of the mafic lower continental crust, and plutonic equivalents of calc-alkaline volcanics. These plutonic calc-alkalines form from subductive-related partial melting of the mantle. OIBs, Continental Arc, Continental Collision, post-orogenic uplift/collapse, continental rifting, hotspots, MORs and oceanic islands.[6][5]

Composites

Fe#, MALI and ASI to define 16 composite types of granitoids.