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During high\u2010pressure overprint, partial biotite breakdown causes a localized increase in the chemical potential of H<jats:sub>2<\/jats:sub>O (<jats:italic>\u03bc<\/jats:italic>H<jats:sub>2<\/jats:sub>O). Transport of H<jats:sub>2<\/jats:sub>O into nearby plagioclase induces the formation of diagnostic eclogite facies assemblages of jadeite\u2013zoisite\u2013K\u2010feldspar\u2013quartz\u2009\u00b1\u2009kyanite\u2009\u00b1\u2009phengite that pervasively replace former cm\u2010sized plagioclase without requiring the participation of free H<jats:sub>2<\/jats:sub>O. Depending on pressure\u2013temperature evolution, similar textures may involve albite instead of jadeite, consistent with the general absence of Na\u2010clinopyroxene in high\u2010pressure metagranitoids and kindred gneisses. Plagioclase breakdown may also occur due to simple burial because compression leads to an increase of <jats:italic>\u03bc<\/jats:italic>H<jats:sub>2<\/jats:sub>O, without requiring additional influx of H<jats:sub>2<\/jats:sub>O at the texture scale. However, the addition of biotite\u2010derived H<jats:sub>2<\/jats:sub>O into plagioclase sites likely increases reaction rates. In parallel, \u223c100\u2010<jats:italic>\u03bc<\/jats:italic>m\u2010thick complementary coronae involving garnet |\u00a0phengite\u2013quartz develop at former biotite\u2013plagioclase\/K\u2010feldspar interfaces due to the coupled diffusion of FeO\u2013MgO\u2013H<jats:sub>2<\/jats:sub>O from biotite towards feldspars and minor CaO in the opposite direction. The reaction textures likely create structural weaknesses and preferential fluid pathways that facilitate further hydration and\/or deformation along the prograde path, thereby obliterating the textures. If exogenous H<jats:sub>2<\/jats:sub>O is introduced, it is accommodated in phengite growing at the expense of igneous K\u2010feldspar and possibly in epidote\u2010group minerals. Upon decompression, such hydrated rocks would dehydrate, thereby favouring fluid\u2010assisted retrogression and loss of diagnostic eclogite facies assemblages at lower pressure. Whereas the prograde reaction textures are only preserved at closed\u2010system conditions and in the absence of deformation, they are suggested to commonly form during orogenic metamorphism of granitoids and quartzofeldspathic gneisses that dominate the continental crust in high\u2010pressure terranes such as the Western Italian Alps and the Western Gneiss Region (Norway).<\/jats:p>","DOI":"10.1111\/jmg.12665","type":"journal-article","created":{"date-parts":[[2022,5,6]],"date-time":"2022-05-06T01:14:20Z","timestamp":1651799660000},"page":"1271-1290","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Self\u2010induced incipient \u2018eclogitization\u2019 of metagranitoids at closed\u2010system conditions"],"prefix":"10.1111","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1671-3198","authenticated-orcid":false,"given":"Simon","family":"Schorn","sequence":"first","affiliation":[{"name":"Department of Petrology and Geochemistry, NAWI Graz Geocenter University of Graz  Graz Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,5,17]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1130\/B26572.1"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/RG013i002p00383"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-821X(87)90158-0"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2541(85)90124-X"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/jmg.12122"},{"issue":"3","key":"e_1_2_9_7_1","first-page":"347","article-title":"Very\u2010high pressure metamorphism of the Brossasco coronite metagranite, southern Dora Maira Massif, Western Alps","volume":"72","author":"Biino G. 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