The Lateritic Nickel-Ore Deposits

Trescases, Jean-Jacques

doi:10.1007/978-3-642-60525-3_6

Cited by 10 publications

(9 citation statements)

References 18 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, in order to recover Mn simultaneously with the other trace metals (Co, Cu, Fe and Ni), the preconcentration has to be carried out between pH 6 and 9 ( Figure 3); this range of pH corresponds to natural values measured in the environment (around pH 8.2 for seawater and typically between 5 and 8 for most rivers; Chester 1993). In New Caledonian rivers, pH values of around 8 are often observed due to the weathering of ultramafic rocks such as peridotites (Trescases 1973). Moreover, the elimination of a chemical reactant (buffer) reduces significantly the possibility of contaminating the sample with impurities.…”

Section: Results and Discussion Ph Optimisationmentioning

confidence: 99%

Development of a Field Preconcentration/Elution Unit for Routine Determination of Dissolved Metal Concentrations by ICP‐OES in Marine Waters: Application for Monitoring of the New Caledonia Lagoon

Moreton

Fernandez

Dolbecq

2009

Geostandard Geoanalytic Res

View full text Add to dashboard Cite

An iminodiacetate chelating resin was optimised for the rapid determination of Co, Cu, Fe, Mn and Ni in seawater. Using inexpensive, high‐capacity, reusable cartridges allowed high flow rates of up to 25 ml min−1. High preconcentration factors, of up to 500, were obtained in order to analyse samples using an ICP‐OES. The requirement for a buffer was eliminated due to the high tolerance of the ICP‐OES to interfering matrix elements, thereby further reducing the potential for contamination. Quantification limits in seawater were: Co = 6 ng l−1, Cu = 8 ng l−1, Fe = 6 ng l−1, Mn = 5 ng l−1 and Ni = 6 ng l−1. The method was verified by the analysis of near shore seawater (CASS‐4) and open ocean seawater (NASS‐5) reference materials. In order to satisfy the high sampling demands using the iminodiacetate cartridges, a portable off‐line preconcentration unit was developed for routine analysis. The multi‐channel preconcentration unit, was capable of treating up to eight samples simultaneously with concentrating times as little as 30 minutes. The technique was also used to determine dissolved metals in fresh and interstitial waters. The technique has been successfully used in a number of environmental studies and impact assessments to evaluate the effects of mining on the New Caledonian lagoon.

show abstract

Section: Results and Discussion Ph Optimisationmentioning

confidence: 99%

Development of a Field Preconcentration/Elution Unit for Routine Determination of Dissolved Metal Concentrations by ICP‐OES in Marine Waters: Application for Monitoring of the New Caledonia Lagoon

Moreton

Fernandez

Dolbecq

2009

Geostandard Geoanalytic Res

View full text Add to dashboard Cite

show abstract

“…Chrysotile is more soluble in the presence of H 2 O and at low pH, and acid leaching removes magnesium from the fi bers fairly rapidly, leading to their disintegration. Amphiboles are more resistant, and amphibole fi bers are more frequently found in soils (Trescases 1997;Hillerdal 2003). Moreover, soils can become enriched in amphiboles as other minerals in the soil weather away.…”

Section: Amphiboles In Soils and Unconsolidated Materialsmentioning

confidence: 99%

Amphiboles: Environmental and Health Concerns

Gunter

Belluso

Mottana

2007

Reviews in Mineralogy and Geochemistry

View full text Add to dashboard Cite

“…(iii) the intergrowth of diamond and lonsdaleite is unlikely being a feature for diamond saw derived particles. (iv) clusters of chromite, diamond and SiC polymorph are observed in natural environment [2,5,28,31]. Therefore, the idea of contamination was ruled out.…”

Section: Discussionmentioning

confidence: 99%

“…Diamonds and exotic minerals such as moissanite (SiC) and metal alloys were described from different ophiolite environments (e.g., Luobusa ophiolite (Tibet), in the early Paleozoic Ray-Iz ophiolite (polar Ural, Russia); Pozanti-Karsanti ophiolite, Eastern Tauride belt, southern Turkey, Mao Baracoa Ophiolite, Cuba and the Tehuitzingo ophiolite, Mexico) [2,4,15,16,28,31]. In all these cases, UHP and diamond are associated with peridotites and chromitite.…”

Section: Discussionmentioning

confidence: 99%

“…Classically, the serpentinized peridotites decomposed into (a) sap-rock, representing serpentinized lithoclasts occurring in a soil matrix, (b) the nickel-rich saprolite, overlain successively by yellow and red laterite, with (c) a top layer of ferricrete. During lateritization, silicates (relict olivines and pyroxenes) are dissolved, and serpentines of several generations are gradually transformed into clay minerals and talc, while dissolved iron precipitates as oxy hydroxides and dissolved silica as quartz [31]. Nickel is often enriched in the latest serpentine generation (3 wt.%) and talc-like phases such as kerolite (about a factor 10 richer than serpentines: 30 wt.% [23,[32][33][34].…”

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Occurrence of SiC and Diamond Polytypes, Chromite and Uranophane in Breccia from Nickel Laterites (New Caledonia): Combined Analyses

et al. 2022

View full text Add to dashboard Cite

Different techniques have been combined to identify the structure and the chemical composition of siliceous breccia from a drill core of nickel laterites in New Caledonia (Tiebaghi mine). XRD analyses show quartz as a major phase. Micro-Raman spectroscopy confirmed the presence of reddish microcrystalline quartz as a major phase with inclusion of microparticles of iron oxides and oxyhydroxide. Lithoclasts present in breccia are composed of lizardite, chrysotile, forsterite, hedenbergite and saponite. The veins cutting through the breccia are filled with Ni-bearing talc. Furthermore, for the first time, we discovered the presence of diamond microcrystals accompanied by moissanite polytypes (SiC), chromite (FeCr2O4) and uranophane crystals (Ca(UO2)2(SiO3OH)2.5(H2O)) and lonsdaleite (2H-[C-C]) in the porosities of the breccia. The origin of SiC and diamond polytypes are attributed to ultrahigh-pressure crystallization in the lower mantle. The SiC and diamond polytypes are inherited from serpentinized peridotites having experienced interaction with a boninitic melt. Serpentinization, then weathering of the peridotites into saprolite, did not affect the resistant SiC polytypes, diamond and lonsdaleite. During karstification and brecciation, silica rich aqueous solutions partly digested the saprolite. Again, the SiC polymorph represent stable relicts from this dissolution process being deposited in breccia pores. Uranophane is a neoformed phase having crystallized from the silica rich aqueous solutions. Our study highlights the need of combining chemical and mineralogical analytical technologies to acquire the most comprehensive information on samples, as well as the value of Raman spectroscopy in characterizing structural properties of porous materials.

show abstract

The Lateritic Nickel-Ore Deposits

Cited by 10 publications

References 18 publications

Development of a Field Preconcentration/Elution Unit for Routine Determination of Dissolved Metal Concentrations by ICP‐OES in Marine Waters: Application for Monitoring of the New Caledonia Lagoon

Development of a Field Preconcentration/Elution Unit for Routine Determination of Dissolved Metal Concentrations by ICP‐OES in Marine Waters: Application for Monitoring of the New Caledonia Lagoon

Amphiboles: Environmental and Health Concerns

Occurrence of SiC and Diamond Polytypes, Chromite and Uranophane in Breccia from Nickel Laterites (New Caledonia): Combined Analyses

Contact Info

Product

Resources

About