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The origin of plati...
The origin of platinum group minerals in oceanic crust
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- Evans, Katy (författare)
- Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia.
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- Reddy, Steven M. (författare)
- Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia.
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- Merle, Renaud (författare)
- Uppsala universitet,Naturresurser och hållbar utveckling
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- Fougerouse, Denis (författare)
- Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia.
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- Rickard, William D. A. (författare)
- Curtin Univ, John Laeter Ctr, GPO Box U1985, Perth, WA 6845, Australia.
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- Saxey, David W. (författare)
- Curtin Univ, John Laeter Ctr, GPO Box U1985, Perth, WA 6845, Australia.
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- Park, Jung-Woo (författare)
- Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 08826, South Korea.
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- Doucet, Luc (författare)
- Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia.
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- Jourdan, Fred (författare)
- Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia.
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Curtin Univ, Sch Earth & Planetary Sci, GPO Box U1985, Perth, WA 6845, Australia Naturresurser och hållbar utveckling (creator_code:org_t)
- Geological Society of America, 2023
- 2023
- Engelska.
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Ingår i: Geology. - : Geological Society of America. - 0091-7613 .- 1943-2682. ; 51:6, s. 554-558
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Highly siderophile elements (HSEs), including Re and Os, are used extensively as geochemical tracers and geochronometers to investigate the formation and evolution of Earth's crust and mantle. Mantle rocks are commonly serpentinized, but the effect of serpentinization on the distribution of HSEs is controversial because HSEs are commonly hosted by rare, micrometer to sub-micrometer-scale grains of platinum group minerals (PGMs) of ambiguous origin that are challenging to identify, characterize, and interpret. In this study, atom probe tomography (APT) is used to characterize two spatially close PGM grains hosted by a partially serpentinized harzburgite from Macquarie Island, Australia. The APT data reveal an extraordinary level of detail that provides insights into the origin of a complex Cu-Pt alloy grain (average composition similar to Cu4Pt). The grain hosts Fe-, Ni-, and Pt-rich sub-grains associated with Rh, variably overlapping networks of Pd-and Cd-enrichment, and OH-rich volumes identified as fluid inclusions. Osmium and Ru are hosted by an idioblastic laurite (RuS2) grain. Compositional, textural, and phase-diagram constraints are consistent with a modified pre-serpentinization origin for the PGMs, and a comparison between observed and calculated grain distributions indicate that while Os isotope ratios were probably unaffected by serpentinization, whole-rock and grain-scale HSE and isotopic ratios may have been decoupled during serpentinization.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
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