Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity

Hutchison, Mark T.; Hursthouse, M. B.; Light, Mark E.

doi:10.1007/s004100100279

Cited by 77 publications

(51 citation statements)

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“…However, these have mainly focussed on diamond, zircon, chromite and garnet as host minerals (e.g. Harris, 1972;McCammon et al, 1998;Ye et al, 2000;Hutchison et al, 2001;Tian et al, 2011;Shatsky et al, 2015). However, new avenues are being explored, with recent studies investigating rutile as a mineral inclusion carrier (Hart et al, 2016;2018).…”

Section: Mineral Inclusion Considerationsmentioning

confidence: 99%

Two billion years of evolution enclosed in hydrothermal rutile: Recycling of the São Francisco Craton Crust and constraints on gold remobilisation processes

et al. 2019

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The Quadrilátero Ferrífero in the São Francisco Craton, Brazil is known for its world-class gold deposits hosted by the Rio das Velhas greenstone belt (RdV). As in other greenstone belts, gold is also concentrated in late Archean/early Paleoproterozoic supracrustal units; in this case within the Moeda Formation. This unit has been compared to the Witwatersrand basin where there has been a long-term debate over the nature of the gold and whether it is detrital (placer), hydrothermal or hybrid (modified placer). Presently, links between gold in the Moeda Formation and RdV are tenuous. To enlighten this area of ambiguity, a new approach using chemical, isotopic and mineral inclusion data from detrital rutile found in the gold-bearing horizons of the Moeda Formation is presented. Grain textures and mineral inclusions have contributed to establishing a primary hydrothermal origin for the rutile, related to As-Fe-Cu-Sb-Pb-W rich mineralising fluids. Fe, Nb and V indicate that the likely source of the gold-related rutiles is the Archean banded iron formations within the RdV, where most of the lode-gold occurs. Average Nb/Ta values of these rutiles are lower than average continental crust ratios which suggests fractionation driven by fluid precipitation and/or competing mineral phases. U-Pb data yield primary crystallisation ages older than deposition ages (> 2.58 Ga), supporting the detrital nature of these rutiles. Rutiles record

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Section: Mineral Inclusion Considerationsmentioning

confidence: 99%

Two billion years of evolution enclosed in hydrothermal rutile: Recycling of the São Francisco Craton Crust and constraints on gold remobilisation processes

et al. 2019

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“…Mineral inclusions were discovered in alluvial diamonds from the São-Luis river valley deposit (Juina province) and were interpreted as originating from the transition zone down to the lower mantle (deeper than 660 km) (Wilding et al 1991;Harte and Harris 1994;Hutchison et al 2001). These diamonds were referred to as superdeep diamonds.…”

Section: Introductionmentioning

confidence: 96%

The characteristic photoluminescence and EPR features of superdeep diamonds (São-Luis, Brazil)

et al. 2015

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“…However, a large proportion of the ferropericlases have Mg# too low for a peridotitic composition and range down to 35 (see Fig. 1; Harte et al 1999;Hayman et al 2005;Hutchinson et al 2001;Kaminsky et al 2001). A number of ferropericlases also have very high Mg# up to 89 that could occur in ultra-depleted peridotite.…”

Section: Introductionmentioning

confidence: 99%

Ferropericlase inclusions in ultradeep diamonds from Sao Luiz (Brazil): high Li abundances and diverse Li-isotope and trace element compositions suggest an origin from a subduction mélange

et al. 2018

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The most remarkable feature of the inclusion suite in ultradeep alluvial and kimberlitic diamonds from Sao Luiz (Juina area in Brazil) is the enormous range in Mg# [100xMg/(Mg+Fe)] of the ferropericlases (fper). The Mg-richer ferropericlases are from the Manuscript Click here to download Manuscript MIPE-D-17-00187_text Chief ed final printing.docx inclusions with variable compositions and a predominance of the Ca-rich, high-pressure silicate inclusions. We suggest that the latter originated from peridotites, mafic rocks and sedimentary rocks as redox products between calcite and SiO2. Keywords Lithium isotopes  Ferropericlase  Diamond  Subduction  Serpentinite  Redox reactions Colour Figure Click here to download Colour Figure Figure 2 ad .eps

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Mineral inclusions in diamonds: associations and chemical distinctions around the 670-km discontinuity

Cited by 77 publications

References 0 publications

Two billion years of evolution enclosed in hydrothermal rutile: Recycling of the São Francisco Craton Crust and constraints on gold remobilisation processes

Two billion years of evolution enclosed in hydrothermal rutile: Recycling of the São Francisco Craton Crust and constraints on gold remobilisation processes

The characteristic photoluminescence and EPR features of superdeep diamonds (São-Luis, Brazil)

Ferropericlase inclusions in ultradeep diamonds from Sao Luiz (Brazil): high Li abundances and diverse Li-isotope and trace element compositions suggest an origin from a subduction mélange

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