{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,11,19]],"date-time":"2024-11-19T16:38:40Z","timestamp":1732034320386},"reference-count":65,"publisher":"Geological Society of London","issue":"6","license":[{"start":{"date-parts":[[2012,11,1]],"date-time":"2012-11-01T00:00:00Z","timestamp":1351728000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JGS"],"published-print":{"date-parts":[[2012,11]]},"abstract":"<jats:p>\n            New structural and geochronological data from the Eastern Palmer Land Shear Zone, in the vicinity of Beaumont Glacier, provide the first evidence of dated structural control on emplacement of the 119\u201395\u2009Ma, &gt;13000\u2009km\n            <jats:sup>2<\/jats:sup>\n            Cretaceous Lassiter Coast Intrusive Suite, during the accretionary mid-Cretaceous Palmer Land Event orogeny. A previously undated &gt;100\u2009m thick dyke-like quartz tonalite intrusion was emplaced at 116.5\u2009\u00b1\u20091.5\u2009Ma (Ar\u2013Ar biotite cooling age) along a NW\u2013SE axis, coeval with NW\u2013SE compressional deformation, and possibly controlled by sinistral transpression along the Beaumont Glacier shear zone. The quartz tonalite preserves two styles of deformation and was probably progressively deformed by normal-sinistral shearing during magmatic cooling with initial deformation of mafic enclaves in the dyke interior and final formation of proto-mylonite to mylonite on the dyke margin. The quartz tonalite cuts folding associated with Phase 1 of the Palmer Land Event, indicating that this folding is older than 116\u2009Ma, extending the onset of Phase 1 back in time. Mylonite on the quartz tonalite sheet margin was subsequently thermally reset at\n            <jats:italic>c<\/jats:italic>\n            . 107\u2009Ma (Ar\u2013Ar biotite method), during a peak in Lassiter Coast Intrusive Suite magmatism.\n          <\/jats:p>\n          <jats:sec>\n            <jats:title>Supplementary material:<\/jats:title>\n            <jats:p>\n              Country rock lithological data, petrographic description of tonalite and Ar\u2013Ar geochronology data are available at\n              <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/www.geolsoc.org.uk\/SUP18552\">www.geolsoc.org.uk\/SUP18552<\/jats:ext-link>\n              .\n            <\/jats:p>\n          <\/jats:sec>","DOI":"10.1144\/jgs2011-160","type":"journal-article","created":{"date-parts":[[2012,11,1]],"date-time":"2012-11-01T14:29:49Z","timestamp":1351780189000},"page":"759-771","source":"Crossref","is-referenced-by-count":8,"title":["Synkinematic emplacement of Lassiter Coast Intrusive Suite plutons during the Palmer Land Event: evidence for mid-Cretaceous sinistral transpression at the Beaumont Glacier in eastern Palmer Land"],"prefix":"10.1144","volume":"169","author":[{"given":"Alan P. 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