{"id":3520,"date":"2016-12-23T16:10:33","date_gmt":"2016-12-23T16:10:33","guid":{"rendered":"http:\/\/webfe10.fe.cpd.local\/caribbeanlithos\/?p=3520"},"modified":"2026-03-04T15:32:36","modified_gmt":"2026-03-04T15:32:36","slug":"2017-the-accumulation-of-ni-in-serpentines-and-garnierites-from-the-falcondo-ni-laterite-deposit-dominican-republic-elucidated-by-means-of-%ce%bcxas","status":"publish","type":"post","link":"https:\/\/caribbeanlithos.ub.edu\/?p=3520","title":{"rendered":"2017: The accumulation of Ni in serpentines and garnierites from the Falcondo Ni-laterite deposit (Dominican Republic) elucidated by means of \u03bcXAS"},"content":{"rendered":"<p><strong>The accumulation of Ni in serpentines and garnierites from the Falcondo Ni-laterite deposit (Dominican Republic) elucidated by means of \u03bcXAS<\/strong><\/p>\n<p><u>Abstract<\/u><\/p>\n<p>Ni-bearing serpentines and garnierites (Ni-bearing Mg-phyllosilicates) are the main Ni ores in the Falcondo Ni-laterite deposit (Dominican Republic). In the present paper a set of garnierite samples and the associated Ni-bearing serpentines with characteristic mineral compositions and textures, from the saprolite horizon, were studied by EMPA, \u03bcXRF and \u03bcXAS. The ultimate goal is to elucidate, for the first time, the Fe speciation and the Ni local environment of saprolite ores from Ni-laterites of the Dominican Republic. The chemical composition of the minerals has been obtained by means of EMPA and the Ni, Fe and Cr elemental maps obtained by \u03bcXRF allowed distinguishing the saprolite fragments containing Ni-bearing serpentines and Fe oxyhydroxides from the garnierite veins. The Fe K-edge \u03bcXANES demonstrated that Fe in the Ni-poor primary serpentine is mostly in the Fe2+ form, whereas in the Ni-bearing serpentine constituting the bulk of the saprolite and in the Fe-bearing garnierite Type I Fe was in the form of Fe3+. In parallel, the local environment of Ni determined by means of Ni K-edge \u03bcEXAFS confirmed that in Ni-poor primary serpentines Ni formed a homogeneous Ni\u2013Mg solid solution, in garnierites formed Ni\u2013Ni clusters, and in Ni-bearing secondary serpentines Ni was found in Ni\u2013Mg and Ni\u2013Ni mixed sites. This paper explains the accumulation of Ni, the speciation of Fe in garnierites with various mineral compositions and in Ni-bearing serpentines from the saprolite horizon in Ni-laterite deposits.<\/p>\n<p><strong>Keywords:<\/strong> \u00a0Falcondo; Garnierites; Serpentines; EMPA; \u03bcXAS; \u03bcXRF; Nickel; Iron<\/p>\n<p>----------------------------------------------------------------------------------------------------------<\/p>\n<p><strong>To Cite this article:<\/strong> Roqu\u00e9-Rosell, J., Villanova-de-Benavent, C., Proenza, J.A., (2017): The accumulation of Ni in serpentines and garnierites from the Falcondo Ni-laterite deposit (Dominican Republic) elucidated by means of \u03bcXAS. <em>Geochimica et Cosmochimica acta<\/em>, 198, 48-69.<\/p>\n<p><strong>DOI<\/strong>: <a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S001670371630641X\">10.1016\/j.gca.2016.11.004<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"The accumulation of Ni in serpentines and garnierites from the Falcondo Ni-laterite deposit (Dominican Republic) elucidated by means of \u03bcXAS Abstract Ni-bearing serpentines and garnierites (Ni-bearing Mg-phyllosilicates) are the main Ni ores in the Falcondo Ni-laterite deposit (Dominican Republic). In the present paper a set of garnierite samples and the associated Ni-bearing serpentines with characteristic mineral compositions and textures, from&nbsp;<a href=\"https:\/\/caribbeanlithos.ub.edu\/?p=3520\" class=\"read-more\">Continue Reading<\/a>","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[127,42,44],"tags":[],"class_list":["post-3520","post","type-post","status-publish","format-standard","hentry","category-publications2017","category-dominicanrepublic","category-publications","cat-127-id","cat-42-id","cat-44-id"],"_links":{"self":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/3520","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3520"}],"version-history":[{"count":1,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/3520\/revisions"}],"predecessor-version":[{"id":3521,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=\/wp\/v2\/posts\/3520\/revisions\/3521"}],"wp:attachment":[{"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caribbeanlithos.ub.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}