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Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in early cambrian black shales of south China / Xu Lingang in Economic geology, Vol. 106 N° 3 (Mai 2011) 

Public ISBD [article]  in Economic geology > Vol. 106 N° 3 (Mai 2011) . - pp. 511-522 Titre : Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in early cambrian black shales of south China : a reassessment Type de document : texte imprimé Auteurs : Xu Lingang, Auteur ; Bernd Lehmann, Auteur ; Mao Jingwen, Auteur Année de publication : 2011 Article en page(s) : pp. 511-522 Note générale : Géologie Economique Langues : Anglais (eng) Mots-clés : Mineralization  Polymetallic  Ni-Mo-PGE-Au  Black  shales  China Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Early Cambrian Niutitang Formation in South China consists of a black shale sequence with a synsedimentary organic carbon-rich polymetallic sulfide layer with extreme metal enrichment locally mined as Ni-Mo-PGE-Au ore. We report a new composite Re-Os isochron age of the sulfide ore layer of 521 ± 5 Ma (n = 14) from three mine sites (Dazhuliushui and Maluhe in the Guizhou province and Sancha in the Hunan province) several hundred kilometers apart. This age corresponds to the biostratigraphic Tommotian age, and is in agreement with recent interpolated Pb-Pb and SHRIMP zircon U-Pb ages from an underlying tuff unit. The initial 187Os/188Os value of the sulfide ore is 0.87 ± 0.07, which is equal to the initial 187Os/188Os ratio of ~0.80 of the black shale host rock, consistent with the seawater origin of the metals under depositional conditions of very low clastic input. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/cgi/content/abstract/106/3/511 [article] Re-Os age of polymetallic Ni-Mo-PGE-Au mineralization in early cambrian black shales of south China : a reassessment [texte imprimé] / Xu Lingang, Auteur ; Bernd Lehmann, Auteur ; Mao Jingwen, Auteur . - 2011 . - pp. 511-522. Géologie Economique Langues : Anglais (eng) in Economic geology > Vol. 106 N° 3 (Mai 2011) . - pp. 511-522 Mots-clés : Mineralization  Polymetallic  Ni-Mo-PGE-Au  Black  shales  China Index. décimale : 553 Géologie économique. Minérographie. Minéraux. Formation et gisements de minerais Résumé : The Early Cambrian Niutitang Formation in South China consists of a black shale sequence with a synsedimentary organic carbon-rich polymetallic sulfide layer with extreme metal enrichment locally mined as Ni-Mo-PGE-Au ore. We report a new composite Re-Os isochron age of the sulfide ore layer of 521 ± 5 Ma (n = 14) from three mine sites (Dazhuliushui and Maluhe in the Guizhou province and Sancha in the Hunan province) several hundred kilometers apart. This age corresponds to the biostratigraphic Tommotian age, and is in agreement with recent interpolated Pb-Pb and SHRIMP zircon U-Pb ages from an underlying tuff unit. The initial 187Os/188Os value of the sulfide ore is 0.87 ± 0.07, which is equal to the initial 187Os/188Os ratio of ~0.80 of the black shale host rock, consistent with the seawater origin of the metals under depositional conditions of very low clastic input. DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/cgi/content/abstract/106/3/511