Novodneprite (AuPb3), anyuiite [Au(Pb, Sb)2] and gold micro- and nano-inclusions within plastically deformed mantle-derived olivine from the Lherz peridotite (Pyrenees, France): a HRTEM–AEM≠
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- 作者：Cristiano Ferraris ; Jean-Pierre Lorand
- 关键词：Novodneprite ; Anyuiite ; Gold nano ; inclusions ; Olivine ; Lherz ; TEM–AEM ; EELS
- 刊名：Physics and Chemistry of Minerals
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：42
- 期：2
- 页码：143-150
- 全文大小：980 KB
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9. Conquéré F, Fabriès J (1984) Chemical disequilibrium and its thermal significance in spinel-peridotite from the Lherz and Freychinède ultramafic bodies (Ariège; French Pyrenees). In: Kornprobst J (ed) Kimberlites II: The mantle and crust-mantle relationships. Elsevier, Amsterdam, pp 319″2 CrossRef
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12. Delpech G, Lorand J-P, Grégoire M, O’Reilly SY (2012) In-situ geochemistry of chalcophile and highly siderophile elements in highly metasomatised Kerguelen mantle xenoliths (South Indian Ocean). Lithos 154:296?4 CrossRef
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14. Dusembaeva KS, Levin VL, Kotel’nikov PE, Bekenova GK (2006) Novodneprite, AuPb3, a new mineral from the Novodneprovskoe deposit (Northern Kazakhstan). Doklady Natsional’noy Akademii Nauk Respubliki Kazakhstan 5:46‰ (in Russian)
15. Fabriès J, Lorand J-P, Bodinier JL, Dupuy C (1991) Evolution of the upper mantle beneath the Pyrenees: evidence from orogenic spinel lherzolite massifs. J Petrol (special Lherzolites issue), 55?
16. Fabriès J, Lorand J-P, Bodinier JL (1998) Petrogenesis of some Central and Western Pyrenean peridotite massifs. Tectonophysics 292:145?7- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Mineralogy
Crystallography
Geochemistry
Mineral Resources- 出版者：Springer Berlin / Heidelberg
- ISSN：1432-2021
文摘
To contribute the problem of the missing (“invisiblegold fraction in mantle rocks, olivine grains separated from orogenic lherzolite of the peridotite body of Lherz (Eastern Pyrenees, France) have been investigated by transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS). The results indicate the presence of micrometric inclusions of novodneprite, AuPb3, and anyuiite, Au(Pb,Sb)2, together with nanometric clusters of metallic gold. Both minerals have been recognised on TEM images as darker contrast inclusions and identified through selected area electron diffraction (SAED) and energy dispersive spectroscopy (EDS) analyses. Gold clusters have been indirectly identified in randomly distributed nano-sized rectangular areas that occur in TEM images obtained from the edges of olivine crystals. Within these volumes the EDS analyses reveal a constant presence of Au (0.12 wt%). High-resolution TEM (HRTEM) investigations evidence series of regularly alternating sigmoidal and ellipsoidal domains developed along [110]. The EELS investigations revealed that the Au signal (M-series lines) arises from the ellipsoidal domains. It is proposed that novodneprite and anyuiite are the result of subsolidus recrystallization of the Pyrenean lherzolites accompanied by a secondary olivine grains growth that trapped inter-granular components. Likely, a process of plastic deformation favoured the formation of edge dislocations within olivine grains and thus, the circulation through them of Au-enriched fluids. A mass balance calculation of the missing gold percentage within this lherzolite points to olivine as one of the potential hosts for about the 80% of the “invisibleold in form of nano-inclusions, whereas only 20% of the whole-rock Au-budget, would be hosted within assemblages of Cu–Fe–Ni sulphides.