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The xenoliths are restricted to post-subduction volcanic rocks that were emplaced in fore-arc or back-arc positions relative to the Mesozoic\u2013Cenozoic Antarctic Peninsula volcanic arc. The xenoliths are spinel-bearing, include harzburgites, lherzolites, wehrlites and pyroxenites, and provide the only direct evidence of the composition of the lithospheric mantle underlying most of the margin. The harzburgites may be residues of melt extraction from the upper mantle (in a mid-ocean ridge type setting), that accreted to form oceanic lithosphere, which was then subsequently tectonically emplaced along the active Gondwana margin. An exposed highly depleted dunite\u2013serpentinite upper mantle complex on Gibbs Island, South Shetland Islands, supports this interpretation. In contrast, pyroxenites, wehrlites and lherzolites reflect percolation of mafic alkaline melts through the lithospheric mantle. Volatile and incompatible trace element compositions imply that these interacting melts were related to the post-subduction magmatism which hosts the xenoliths. The scattered distribution of such magmatism and the history of accretion suggest that the dominant composition of sub-Antarctic Peninsula lithospheric mantle is likely to be harzburgitic.<\/jats:p>","DOI":"10.1144\/m56-2019-44","type":"journal-article","created":{"date-parts":[[2021,2,15]],"date-time":"2021-02-15T11:10:14Z","timestamp":1613387414000},"page":"101-114","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Ultramafic mantle xenoliths in the Late Cenozoic volcanic rocks of the Antarctic Peninsula and Jones Mountains, West Antarctica"],"prefix":"10.1144","volume":"56","author":[{"given":"Philip T.","family":"Leat","sequence":"first","affiliation":[{"name":"British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK"},{"name":"School of Geography, Geology and the Environment, University of Leicester, University Road, Leicester LE1 7RH, UK"}]},{"given":"Aidan J.","family":"Ross","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK"}]},{"given":"Sally A.","family":"Gibson","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK"}]}],"member":"1881","published-online":{"date-parts":[[2021,4,28]]},"reference":[{"key":"e_1_3_5_2_1","doi-asserted-by":"publisher","DOI":"10.5817\/CPR2018-1-5"},{"key":"e_1_3_5_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/2015JB011917"},{"key":"e_1_3_5_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2541(94)90066-3"},{"key":"e_1_3_5_5_1","doi-asserted-by":"publisher","DOI":"10.1017\/S095410200999054X"},{"key":"e_1_3_5_6_1","doi-asserted-by":"publisher","DOI":"10.1144\/gsjgs.139.6.0787"},{"key":"e_1_3_5_7_1","first-page":"365","volume-title":"13th Congreso Geol\u00f3gico Chileno, Actas","author":"Bast\u00edas J.","year":"2012","unstructured":"Bast\u00edas, J., Herv\u00e9, F., Fuentes, F., Schilling, M., Poiron, A., Guti\u00e9rrez, F. and Ramirez, C. 2012. 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