NUCLEATION ENVIRONMENT OF DIAMONDS FROM YAKUTIAN KIMBERLITES
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dc.contributor.author | Bulanova G.P. | |
dc.contributor.author | Griffin W.L. | |
dc.contributor.author | Ryan C.G. | |
dc.date.accessioned | 2020-12-30T04:52:56Z | |
dc.date.available | 2020-12-30T04:52:56Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=13281658 | |
dc.identifier.citation | Mineralogical Magazine, 1998, , NaN, 409-419 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21784 | |
dc.description.abstract | The micro-inclusions located in the genetic centre of Yakutian diamond monocrystals have been studied using optical (anomalous birefringence, photoluminescence, cathodoluminescence) and microanalytical (electron-microprobe, proton-microprobe, scanning electron microscope) methods. Most diamonds nucleated heterogeneously on mineral seeds, that lowered the energy barrier to nucleation. Nucleation of peridotitic diamonds occurred on a matrix of graphite+iron+wüstite, in an environment dominated by forsteritic olivine and Fe-Ni sulfide. Nucleation of eclogitic diamonds occurred on a matrix of sulfide ± iron in an environment dominated by Fe-sulfide and omphacite (+/-K-Na-Al-Si-melt). The mineral assemblages recorded in the central inclusions of Yakutian diamonds indicate that they grew in a reduced environment, with oxygen fugacity controlled by the iron-wüstite equilibrium. Nucleation of diamond occurred in the presence of a fluid, possibly a volatile-rich silicate melt, highly enriched in LIL (K, Ba, Rb, Sr) and HFSE (Nb, Ti, Zr) elements. This fluid also carried immiscible Fe-Ni-sulfide melts, and possibly a carbonatitic component; the introduction of this fluid into a reduced refractory environment may have been accompanied by a thermal pulse, and may have created the conditions necessary for the nucleation and growth of diamond. | |
dc.title | NUCLEATION ENVIRONMENT OF DIAMONDS FROM YAKUTIAN KIMBERLITES | |
dc.type | Статья |
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