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Variations of olivine Fo–Ni contents and highly chalcophile element abundances in arc ultramafic cumulates, southern Alaska
Chusi Li;  Edward M. Ripley;  Joyashish Thakurta;  Eric C. Stifter;  Liang Qi
2013
Source PublicationChemical Geology
Volume351Pages:15-28
Abstract

Recent drilling in the Duke Island Complex shows that some olivine clinopyroxenites from Hall Cove contain low-S but high Pt + Pd. In contrast, dunites from the Duke Island Complex and the Yellow Hill intrusion on nearby Annette Island are low in Pt + Pd as well as S. New data from this study show that the low-S ultramafic rocks from Duke and Annette Islands are extreme cumulates of olivine and/or clinopyroxene and all contain trace to minor amounts of cumulus sulfide. As a result, the ratios of the least-mobile, highly chalcophile elements in these rocks mainly reflect those of original sulfide liquids which in turn reflect those of their parental magmas. Our data also show that all dunite samples from Annette Island contain Ni-depleted, primitive olivine with Fo contents > 90 mol% and Ni contents < 1200 ppm, indicating a primitive but significantly Ni-depleted parental magma for these rocks. Whole-rock compositions indicate that the parental magma was not depleted in platinum-group elements (PGE). The mantle-normalized PGE patterns of these samples are remarkably similar to dunites from some Ural-type ultramafic intrusions in Ural, Russia. They are all characterized by mantle-like Ru/Ir ratio plus significant Pt enrichment relative to other PGEs. Given their common occurrences in the world, we propose a Ni-depleted, Pt-enriched mantle component as the source for the parental magma of this type of dunite. A comparison of olivine and whole-rock compositions between different types of rocks from the Duke Island Complex reveals that significant Ir–Ru depletions relative to Pt–Pd in olivine clinopyroxenites from Hall Cove are most likely due to Ir-alloy and laurite segregation from their parental magma before it reached sulfide saturation.

KeywordPlatinum-group Elements Nickel Sulfide Dunite Subarc Mantle Alaskan-type Complex
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9419
Collection矿床地球化学国家重点实验室
Affiliation1.Department of Geological Sciences, Indiana University, Bloomington, IN 47401, USA
2.Department of Geosciences, Western Michigan University, Kalamazoo, MI 49008, USA
3.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
Recommended Citation
GB/T 7714
Chusi Li;Edward M. Ripley;Joyashish Thakurta;Eric C. Stifter;Liang Qi. Variations of olivine Fo–Ni contents and highly chalcophile element abundances in arc ultramafic cumulates, southern Alaska[J]. Chemical Geology,2013,351:15-28.
APA Chusi Li;Edward M. Ripley;Joyashish Thakurta;Eric C. Stifter;Liang Qi.(2013).Variations of olivine Fo–Ni contents and highly chalcophile element abundances in arc ultramafic cumulates, southern Alaska.Chemical Geology,351,15-28.
MLA Chusi Li;Edward M. Ripley;Joyashish Thakurta;Eric C. Stifter;Liang Qi."Variations of olivine Fo–Ni contents and highly chalcophile element abundances in arc ultramafic cumulates, southern Alaska".Chemical Geology 351(2013):15-28.
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