Topic
Allchar deposit
About: Allchar deposit is a research topic. Over the lifetime, 12 publications have been published within this topic receiving 83 citations.
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01 Jan 2001
TL;DR: In this article, the Tl-As-Sb-Au mineral assemblage after detailed and intense research work has been discussed and four types of mineralization have been distinguished.
Abstract: The paper is a summary of investigations carried out on minerals of the Allchar deposit. It discusses the Tl-As-Sb-Au mineral assemblage after detailed and intense research work. Four types of mineralization have been distinguished based on the mineral assemblage present: 1. The first type is characterized by high content of iron and sulphur, but lower arsenic and thallium content. The pyrite-marcasite mineral assemblage is characterized by the presence of some quantities of arsenic-pyrit. 2. The second type is characterized by the high antimony and low iron and thallium content. Stibnite is the most common mineral in the group. 3. The third type is characterized by the high arsenic and sulphur and relatively low thallium content. Orpiment is the most common mineral in this group. 4. The fourth type of minerals is characterized by the high content of arsenic, sulphur, iron and thallium. This type of minerals is accompanied by the high content of manganese and zinc.
13 citations
TL;DR: The micro-Raman spectra of the extremely rare Tl-sulfosalts from Allchar (fangite, vrbaite, raguinite and rebulite) are presented and the bands are assigned for the first time although the minerals are known at least for 30 years.
Abstract: The micro-Raman spectra of the extremely rare Tl-sulfosalts from Allchar (fangite, vrbaite, raguinite and rebulite) are presented and the bands are assigned for the first time although the minerals are known at least for 30 years. For the ease of the interpretation, the spectra–structure correlations were derived with the assistance of other natural Tl-containing minerals also collected from Allchar (lorandite and parapierrotite) and other synthetic Tl-analogues (ellisite, stibioellisite, and weissbergite), whose spectral characteristics have already been described. The similarities occurring in the Raman spectra arise from the presence of XS3 trigonal pyramids (X = As and/or Sb) and/or XS4 tetrahedral units (X = As and Fe) in the structure of all discussed Tl-sulfosalts. In addition, particular attention is stressed on the used laser intensity, establishing proper individualized protocol for each laser-sensitive Tl-sulfosalt. Copyright © 2014 John Wiley & Sons, Ltd.
13 citations
13 Jan 2012
TL;DR: The Allchar Sb-As-Tl-Au hydrothermal deposit is located at the northwestern margins of Kožuf Mts. (Republic of Macedonia), close to the border between Republic of Macedonia and Greece.
Abstract: The Allchar Sb-As-Tl-Au volcanogenic hydrothermal deposit is situated at the northwestern margins of Kožuf Mts. (Republic of Macedonia), close to the border between Republic of Macedonia and Greece (Fig.1). From the geotectonic point of view, ore mineralization is related to a Pliocene volcano-intrusive complex located between the rigid Pellagonian block in the west, and the labile Vardar zone in the east. From the metallogenic point of view, the Allchar deposit belongs to the Kožuf ore district as part of the Serbo-Macedonian metallogenetic province.
12 citations
TL;DR: The LORandite EXPERVATION (acronym LOREX) is the only geochemical solar neutrino experiment still actively persued as mentioned in this paper, and the LORANDITE EXPERVISION project is the most important geochemical project in the world.
Abstract: The LORandite EXperiment (acronym LOREX) is the only geochemical solar neutrino experiment still actively persued. The Tl-mineral lorandite, TlAsS2, occurs in the ore deposit Allchar, Macedonia, close to the border of Greece. The polychronous and polygenetic Sb-As-Tl-Au Allchar deposit was formed by complex physico-chemical processes occurring in a heterogeneous geological environment and by interaction of polyphase hydrothermal fluids with the surrounding magmatic, sedimentary and metamorphic rocks. The genesis of ore mineralization is related to the products of polyphase magmatic activity of Pliocene age (~6.5 to ~1.8 Ma) and its spatial location was controlled by magmatic, structural and lithological factors. The Allchar deposit comprises several orebodies of various shapes, textural-structural characteristics and element associations. Thallium mineralization, which is of significance for the LOREX project, has been proved in two locations: (i) ore body Crven Dol in the northern part and (ii) ore body Centralni Deo in the central part of the Allchar deposit. The age of Tl-mineralization is 4.22 Ma at the Crven Dol locality and 4.31 Ma at Rudina near to the Centralni Deo locality. The present depth of ore mineralization from the present soil surface is about 30 m to 140 m, whereas the paleodepth of its formation is considerably bigger. Using the method of quantitative geomorphological analysis, and AMS- and MS-measurements of cosmogenic radionuclides 26Al, 21Ne, and 3He, the erosion rate has been established to be ~70 m/Ma in the broader area of the Crven Dol locality and ~130 m/Ma in the Centrani Deo of the Allchar deposit. On the basis of these erosion rates and ages of Tl-mineralization, we have calculated the paleo-depth of Lorandite to be ca 180 m ± 35 m to 420 m ± 80 m. Geochemical and mineralogical investigations on lorandite in particular its trace elements (Pb, U, and Th), the quantity of lorandite in the two ore bodies, the geological age and the paleo depth of Tl-mineralization have provided encouraging results and indicate the feasibility of the LOREX project.
11 citations
15 Aug 1988-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the concentration of thallium was determined in samples from the Allchar deposit by flame and flameless atomic absorption spectrometry, and a concentration of 10-2000 ppm was found in samples of Allchar ore.
Abstract: The concentration of thallium was determined in samples from the Allchar deposit by flame and flameless atomic absorption spectrometry. Interferences of various elements were investigated. A concentration of 10–2000 ppm was found in samples from Allchar ore.
9 citations