Giant Metallic Deposits

Laznicka, Peter

doi:10.1007/978-3-642-12405-1

Cited by 52 publications

(27 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Detecting possible future deposits and determining the concentrations and relative enrichment of REEs in carbonatites, silicocarbonatites, peralkaline granites and pegmatites are of interest for mineral exploration and mining processes. The world's largest REE deposits are mostly bound to carbonatites or their altered equivalents [1]. The geochemical investigation of REE distributions within outcrops and the characterization of parental melts are currently debated and are usually performed by conducing laboratory analyses or by collecting handheld X-ray fluorescence measurements at a single spot [2].…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral REE (Rare Earth Element) Mapping of Outcrops—Applications for Neodymium Detection

et al. 2015

View full text Add to dashboard Cite

Abstract:In this study, an in situ application for identifying neodymium (Nd) enriched surface materials that uses multitemporal hyperspectral images is presented (HySpex sensor). Because of the narrow shape and shallow absorption depth of the neodymium absorption feature, a method was developed for enhancing and extracting the necessary information for neodymium from image spectra, even under illumination conditions that are not optimal. For this purpose, the two following approaches were developed: (1) reducing noise and analyzing changing illumination conditions by averaging multitemporal image scenes and (2) enhancing the depth of the desired absorption band by deconvolving every image spectrum with a Gaussian curve while the rest of the spectrum remains unchanged (Richardson-Lucy deconvolution). To evaluate these findings, nine field samples from the Fen complex in Norway were analyzed using handheld X-ray fluorescence devices and by conducting detailed laboratory-based geochemical rare earth element determinations. The result is a qualitative outcrop map that highlights zones that are enriched in neodymium. To reduce the influences of non-optimal illumination, particularly at the studied site, a OPEN ACCESSRemote Sens. 2015, 7 5161 minimum of seven single acquisitions is required. Sharpening the neodymium absorption band allows for robust mapping, even at the outer zones of enrichment. From the geochemical investigations, we found that iron oxides decrease the applicability of the method. However, iron-related absorption bands can be used as secondary indicators for sulfidic ore zones that are mainly enriched with rare earth elements. In summary, we found that hyperspectral spectroscopy is a noninvasive, fast and cost-saving method for determining neodymium at outcrop surfaces.

show abstract

Section: Introductionmentioning

confidence: 99%

Hyperspectral REE (Rare Earth Element) Mapping of Outcrops—Applications for Neodymium Detection

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Karstification creates space for bauxite deposition. Bauxite accumulated in the karst cavities is more protected from erosion compared to regolith on silicate rocks [11,62]. Such a process leads to the formation of a specific type of karst called ore karst which occurs only on the exokarst floor [63].…”

Section: Discussionmentioning

confidence: 99%

Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

et al. 2016

View full text Add to dashboard Cite

Abstract:The Dopolan deposit is a Mediterranean-type bauxite located in the Zagros Fold-Thrust Zone, Iran. This deposit consists of five lithological members including iron-rich, clay-rich, oolitic, pisolitic and organic matter-containing bauxites. The mineralogy of the deposit includes diaspore, boehmite, and kaolinite, nacrite, with minor pyrite, anatase and rutile. Geochemical studies show that light rare earth elements (LREEs) are enriched relative to heavy rare earth elements (HREEs) in all members, supporting an authigenic origin. Mass changes based on Ti as an immobile element indicate that conventionally-immobile elements (Al, Nb, Ta, Zr, Hf) are enriched in situ in the residual units, whereas mobile elements (K, Ca, Si) were depleted during bauxitization. This study shows that the Khaneh-Kat argillitic dolomite is the likely parent rock. The δ 18 O (7.63‰to 9.35‰) and δD values (´49.91‰to´66.49‰) for kaolinite in the bauxite samples suggest equilibration with meteoric waters which supports a supergene origin. Bauxitization occurred in a warm climate with relatively constant isotopic composition suggesting climate stability during the development of bauxite horizons and remobilization of Al (with formation of secondary boehmite). The δ 13 C values of calcite (´7.3‰) in the bauxite support the idea that the Khaneh-Kat Formation has experienced post-depositional isotope exchange with meteoric waters during the karstification process.

show abstract

“…LCT pegmatites are rare, forming about 0.1% of all pegmatites, and lithium-rich pegmatites are even rarer. 59 They are also the only known sources of cesium and rubidium and an important source of tantalum. Kesler et al provide an overview of the main Li-bearing pegmatites geology and mineralizations.…”

Section: Pegmatites and Highly Differentiated Granites Aplites And mentioning

confidence: 99%

Global Lithium Resources and Sustainability Issues

Christmann

Gloaguen

Labbé

et al. 2015

Lithium Process Chemistry

View full text Add to dashboard Cite

Giant Metallic Deposits

Cited by 52 publications

References 0 publications

Hyperspectral REE (Rare Earth Element) Mapping of Outcrops—Applications for Neodymium Detection

Hyperspectral REE (Rare Earth Element) Mapping of Outcrops—Applications for Neodymium Detection

Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

Global Lithium Resources and Sustainability Issues

Contact Info

Product

Resources

About