NDLI: Re–Os geochemistry and geochronology of the Ransko gabbro

Content Provider	Springer Nature Link
Author	Ackerman, Lukáš Pašava, Jan Erban, Vojtěch
Copyright Year	2013
Abstract	The Ransko gabbro–peridotite massif in Eastern Bohemia is a strongly differentiated intrusive complex, which hosts low-grade Ni–Cu ores mainly developed close to the contact of olivine-rich rocks with gabbros, in troctolites, and to a much lesser extent in both pyroxene and olivine gabbros and plagioclase-rich peridotites. Gabbro, troctolite, peridotite and Ni–Cu ores from the Jezírka Ni–Cu (PGE) deposit, considered to be a typical example of the liquid segregation style of mineralization, were analyzed for Re–Os concentrations and isotopic ratios. Seven barren and mineralized samples from the Jezírka deposit yielded a Re–Os regression of 341.5 ± 7.9 Ma (MSWD = 69). Strongly mineralized peridotite with mantle-like initial 187Os/188Os ratio of 0.125 suggests that Os as well as other PGE present in the Ni–Cu mineralization are predominantly of mantle origin. On the other hand, barren and low-mineralized samples have radiogenic initial 187Os/188Os ratios of 0.14–0.16 suggesting some import of Re and/or radiogenic 187Os most likely through contamination by continental crust during magma emplacement. The Re–Os age of the Ransko Massif is significantly younger than the previously suggested Lower Cambrian age, but it is similar to and/or younger than the age of metamorphism of the adjacent Kutná Hora crystalline complex and the Moldanubian unit. Therefore, it is likely that the emplacement of the Ransko massif and its Ni–Cu mineralization was closely connected with the late-stage evolution of the Kutná Hora crystalline complex.
Starting Page	799
Ending Page	804
Page Count	6
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	48
Issue Number	7
e-ISSN	14321866
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-09
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Re–Os Geochronology Gabbro Bohemian Massif Ni–Cu mineralization Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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