{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T14:47:36Z","timestamp":1761662856950},"reference-count":39,"publisher":"Mineralogical Society","issue":"2","license":[{"start":{"date-parts":[[2018,7,9]],"date-time":"2018-07-09T00:00:00Z","timestamp":1531094400000},"content-version":"unspecified","delay-in-days":2960,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clay miner."],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>A general alteration pattern of two transitional clay mineral assemblages was determined by petrography and X-ray diffractometry studies at the Tandilia Late Proterozoic unconformity zone, around the Barker locality: (1) K-white mica + chlorite + calcite \u00b1 anatase-rutile \u00b1 secondary quartz (farther from the unconformity) and (2) pyrophyllite + K-white mica + Ti-rich hematite \u00b1 aluminium phosphate-sulphate minerals \u00b1 tourmaline \u00b1 anatase-rutile (closer to the unconformity). The local occurrence of Na in K-white micas and K-Na in pyrophyllite is described for the first time. Possible interlayering with intermediate K-Na mica and paragonite is indicated by detailed X-ray diffraction analyses. A negative Eu anomaly (Eu\/Eu* = 0.24), strongly positive Eu anomaly (Eu\/Eu* =11.7) and positive Ce anomaly characterized rapid changes from an unaltered basement to the most altered basement and sedimentary rocks at the unconformity. Aluminium phosphate-sulphate minerals dominate patterns of <jats:italic>LREE<\/jats:italic>. A model of hydrothermal alteration comparable to that of unconformity-related uranium deposits is presented.<\/jats:p>","DOI":"10.1180\/claymin.2010.045.2.209","type":"journal-article","created":{"date-parts":[[2010,7,21]],"date-time":"2010-07-21T21:43:44Z","timestamp":1279748624000},"page":"209-224","source":"Crossref","is-referenced-by-count":8,"title":["A hydrothermal clay mineral assemblage at the Late Proterozoic unconformity in the Buenos Aires Complex \u2013 La Tinta Formation, Barker area, Tandilia Ranges (Argentina)"],"prefix":"10.1180","volume":"45","author":[{"given":"J. C.","family":"Mart\u00ednez","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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