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Posted by / 23-Feb-2017 09:32

Re os age dating

cookies, tags, and tracking settings to store information that help give you the very best browsing experience.To understand more about cookies, tags, and tracking, see our Privacy Statement *Prices in US$ apply to orders placed in the Americas only. The subsurface Rochovce granite intrusion was emplaced into the contact zone between two principal tectonic units (the Veporic Unit and the Gemeric Unit) of the Central Western Carpathians (CWC), Slovakia.The sub-suite of peridotites from the Kaapvaal craton are first analysed for whole-rock major and trace elements, Re-Os and HSE systematics.The peridotites were also analysed for the 187Os/188Os compositions at the single grain base metal sulphide (BMS) and platinum-group mineral (PGM) scale.Prices in GBP apply to orders placed in Great Britain only. The Cretaceous age of this granite and its Mo-W mineralization is shown using two independent methods: U-Pb on zircon and Re-Os on molybdenite.Prices in € represent the retail prices valid in Germany (unless otherwise indicated). The studied zircons have a typical homogeneous character with oscillatory zoning and scarce restite cores.The second molybdenite occurs as 1-2 mm disseminations in finegrained granite, and provides an age of 81.6 ± 0.3 Ma.

The Os composition of the Pt-alloys, combined with their nano-particle nature and the Os dichotomy with the host BMS signifies that the Pt-alloys formed in a HSE-Si-rich melt.

As such, the whole-rock and single grain BMS TRD (rhenium depletion model age) indicate that the mantle was pervasively metasomatised as early as 3.2 Ga.

Nano-particle PGM (Pt-alloys) with radiogenic 187Os/188Os (0.1294-0.1342) were found included within unradiogenic BMS (187Os/188Os 0.1066-0.1084).

The 187Os/188Os analyses of the BMS provide ages 2.5 Ga older than the whole-rock.

The oldest BMS TRD age of 3.7 Ga is preserved in a metasomatic BMS associated with secondary clinopyroxene and phlogopite.

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