Re-Os isotopic constraints on the source of platinum-group minerals (PGM) from the Vestřev pyrope-rich garnet placer deposit, Bohemian Massif
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F15%3A00000395" target="_blank" >RIV/00025798:_____/15:00000395 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0169136815000268" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0169136815000268</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.oregeorev.2015.01.013" target="_blank" >10.1016/j.oregeorev.2015.01.013</a>
Alternative languages
Result language
angličtina
Original language name
Re-Os isotopic constraints on the source of platinum-group minerals (PGM) from the Vestřev pyrope-rich garnet placer deposit, Bohemian Massif
Original language description
Mineralogical studies of the heavy fraction from a Holocene pyrope-rich garnet placer deposit at Vestřev (Krkonoše Piedmont Basin, Bohemian Massif) have identified the presence of very rare grains of platinum group minerals (PGM). Pt-Fe alloy grains are accompanied by Os-Ir-Ru minerals (native osmium, iridium, and ruthenium) with inclusions of Pt-Fe alloy and hongshiite (PtCu). This mineral assemblage is typical for several mantle settings including ophiolites. The chemistry of the Os-Ir-Ru minerals shows an enrichment of the PGM in Ru,which is typical of ophiolites. The grain morphology of PGM and pyrope-rich garnet (mostly rounded with numerous euhedral/subhedral grains) does not exclude a common source. In-situ laser-ablation MC-ICP-MS was used to measure the Re-Os isotopic compositions of single Os rich grains, which show heterogeneous subchondritic Os isotopic compositions (187Os/188Os = 0.12082 - 0.12505±0.00003). This precludes their low-temperature origin and indicates derivation of platinum-group elements (PGE) essentially from mantle-derived rocks without a significant contribution of crustal Os. The mantle model age (TMA) and Re-depletion model age(TRD) model ages range from ~0.4 to ~1.0 Ga and most likely reflect a long history of meltdepletion that affected the mantle sources of PGM.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
<a href="/en/project/GA13-15390S" target="_blank" >GA13-15390S: Re-Os geochronology of ore mineralizations from the Bohemian Massif with possible metallogenic implications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Ore Geology Reviews
ISSN
0169-1368
e-ISSN
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Volume of the periodical
68
Issue of the periodical within the volume
July
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
117-126
UT code for WoS article
000350935000008
EID of the result in the Scopus database
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