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Alpine metamorphism was previously detected in the Bihor Unit and the Biharia NS, but not in the Codru NS. This study is aimed at explaining this difference, using deformed Permian volcanic rocks from the Codru NS. Illite\/mica is the dominant metamorphic mineral in the deformed felsic rocks, while chlorite dominates in the deformed mafic rocks. Illite\/mica is a mixture of 1\u00a0M and 2M<jats:sub>1<\/jats:sub> polytypes (also 1M<jats:sub>\n              <jats:underline>d<\/jats:underline>\n            <\/jats:sub> in one sample), perfectly non-swelling, and with the 0.31\u20130.35 <jats:italic>\u0394<\/jats:italic>\u00b0 2<jats:italic>\u03b8<\/jats:italic> range of the standardized K\u00fcbler index. Electron probe microanalysis (EPMA) documented two varieties of illite\/mica: illite\/phengite and illite\/muscovite. Combined mineral metamorphic indicators (illite\/mica characteristics, presence of epidote, and the absence of metamorphic biotite) restrict the maximum metamorphic temperatures to the 250\u2013310\u00a0\u00b0C range, explaining the lack of Alpine ages in the earlier studies: temperatures below resetting of the old coarse-grained micas, which were used for dating. Our new K\u2013Ar data constrain the cooling ages of illite\/mica in the Codru NS to 117\u2014112\u2009\u00b1\u20093.2\u00a0Ma in the Dieva and Moma nappes, and 102\u2009\u00b1\u20093\u00a0Ma in the Arieseni nappe. These ages correspond to the denudation during the eastward advancing of the thrust wedge during the \u201cAustrian\u201d tectonic phase.<\/jats:p>\n          <jats:p>\n            <jats:bold>Graphical Abstract<\/jats:bold>\n          <\/jats:p>","DOI":"10.1007\/s00531-025-02523-0","type":"journal-article","created":{"date-parts":[[2025,7,15]],"date-time":"2025-07-15T18:53:20Z","timestamp":1752605600000},"page":"805-823","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mid-Cretaceous Alpine metamorphism of the Tisza Mega-Unit (Inner\u00a0Carpathians) constrained by illite K\u2013Ar dating and mineral metamorphic indicators"],"prefix":"10.1007","volume":"114","author":[{"given":"Iuliu","family":"Bobos","sequence":"first","affiliation":[]},{"given":"Jan","family":"\u015arodo\u0144","sequence":"additional","affiliation":[]},{"given":"Alexandre","family":"Kounov","sequence":"additional","affiliation":[]},{"given":"Juliano","family":"Senna","sequence":"additional","affiliation":[]},{"given":"Marek","family":"Szczerba","sequence":"additional","affiliation":[]},{"given":"Zuzanna","family":"Ciesielska","sequence":"additional","affiliation":[]},{"given":"Ionel","family":"Nicolae","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,7,15]]},"reference":[{"key":"2523_CR1","doi-asserted-by":"publisher","first-page":"623","DOI":"10.17491\/jgsi\/1991\/380610","volume":"38","author":"A Absar","year":"1991","unstructured":"Absar A (1991) Hydrothermal epidote\u2014an indicator of temperature and fluid composition. 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