In recent years, the many new occurrences reported in the literature of ultramafic rocks that have phlogopite as a major constituent and do not fall into the categories of kimberlites, lamproites, and lamprophyres have highlighted the need for a classification that includes this abundant mineral phase. Currently, a broadly accepted classification with phlogopite does not exist, and the only term used by scientists is “phlogopite-bearing” when this phase is above 5 vol% and up to 90 vol%. For this reason, we propose a new classification that integrates phlogopite into the current classification of ultramafic rocks without modifying the already accepted terminology or the classificative criteria (i.e., the mineral modal abundances). Phlogopite is added as an end member in the ultramafic-rocks classification diagrams, changing their shapes from triangular to tetrahedral. An Excel spreadsheet containing the new diagrams and a macro that automatically classifies the rocks is provided.

Filling the Gap in the Classification of Phlogopite-Bearing Ultramafic Rocks / Giovanardi, Tommaso; Freddo, Ivan; Mazzucchelli, Maurizio. - In: THE JOURNAL OF GEOLOGY. - ISSN 0022-1376. - 126:3(2018), pp. 361-370. [10.1086/697244]

Filling the Gap in the Classification of Phlogopite-Bearing Ultramafic Rocks

Giovanardi, Tommaso;FREDDO, IVAN;Mazzucchelli, Maurizio
2018

Abstract

In recent years, the many new occurrences reported in the literature of ultramafic rocks that have phlogopite as a major constituent and do not fall into the categories of kimberlites, lamproites, and lamprophyres have highlighted the need for a classification that includes this abundant mineral phase. Currently, a broadly accepted classification with phlogopite does not exist, and the only term used by scientists is “phlogopite-bearing” when this phase is above 5 vol% and up to 90 vol%. For this reason, we propose a new classification that integrates phlogopite into the current classification of ultramafic rocks without modifying the already accepted terminology or the classificative criteria (i.e., the mineral modal abundances). Phlogopite is added as an end member in the ultramafic-rocks classification diagrams, changing their shapes from triangular to tetrahedral. An Excel spreadsheet containing the new diagrams and a macro that automatically classifies the rocks is provided.
2018
19-mar-2018
126
3
361
370
Filling the Gap in the Classification of Phlogopite-Bearing Ultramafic Rocks / Giovanardi, Tommaso; Freddo, Ivan; Mazzucchelli, Maurizio. - In: THE JOURNAL OF GEOLOGY. - ISSN 0022-1376. - 126:3(2018), pp. 361-370. [10.1086/697244]
Giovanardi, Tommaso; Freddo, Ivan; Mazzucchelli, Maurizio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1160253
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