Micrometer- and nanometer-sized platinum group nuggets in micrometeorites from deep-sea sediments of the Indian Ocean

Micrometer- and nanometer-sized platinum group nuggets in micrometeorites from deep-sea sediments of the Indian Ocean

– We examined 378 micrometeorites collected from deep‐sea sediments of the Indian Ocean of which 175, 180, and 23 are I‐type, S‐type, and G‐type, respectively. Of the 175 I‐type spherules, 13 contained platinum group element nuggets (PGNs). The nuggets occur in two distinct sizes and have distinctly...

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Veröffentlicht in:Meteoritics & planetary science 2011-03, Vol.46 (3), p.470-491
Hauptverfasser: RUDRASWAMI, N. G., PARASHAR, K., SHYAM PRASAD, M.
Format: Artikel
Sprache:eng
Schlagworte:
Depletion
Distillation
Iridium
Micrometeorites
Palladium
Platinum
Sediments
Spherules
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Zusammenfassung:– We examined 378 micrometeorites collected from deep‐sea sediments of the Indian Ocean of which 175, 180, and 23 are I‐type, S‐type, and G‐type, respectively. Of the 175 I‐type spherules, 13 contained platinum group element nuggets (PGNs). The nuggets occur in two distinct sizes and have distinctly different elemental compositions: micrometer (μm)‐sized nuggets that are >3 μm contain dominantly Ir, Os, and Ru (iridium‐platinum group element or IPGE) and sub‐μm (or nanometer)‐sized (
ISSN:1086-9379
1945-5100
DOI:10.1111/j.1945-5100.2011.01169.x