scholarly journals New data on titanium mineralization in fenitized precambrian carbonate rocks of Middle Timan bystrinskaya series

2021 ◽  
Vol 6 ◽  
pp. 38-48
Author(s):  
I. I. Golubeva ◽  
◽  
A. S. Shuisky ◽  
V. N. Filippov ◽  
E. M. Tropnikov ◽  
...  
Keyword(s):  
Mineral Composition ◽  
Carbonate Rocks ◽  
Parent Rocks ◽  
Middle Timan ◽  
Weathering Crusts ◽  
High Concentrations

Fenitized Precambrian carbonate rocks (Middle Timan) are parent rocks for bauxite — phosphate weathering crusts. Therefore, the mineral composition of fenites, characterized by rich and varied mineralization, is of great interest. Titanium minerals especially attract attention, since their high concentrations are noted in bauxite-phosphate weathering crusts. For example, in the bauxites of the Verkhne-Shchugorsk area, the amount of rutile may reach 6000—7000 g/t. Titanium mineralization is represented by titanite, rutile, anatase, and cassite.

scholarly journals Determination of Scandium in mafic and ultramafic rocks of ophiolites from Luk Ulo Complex, Karangsambung, Central Java, Indonesia

2020 ◽  
Vol 200 ◽  
pp. 06003
Author(s):  
Nugroho Imam Setiawan ◽  
Kardo Polarman Rajoki Silitonga ◽  
Fahmi Adiyatma Makkaratte ◽  
Chusni Ansori
Keyword(s):  
Mineral Composition ◽  
General Trend ◽  
Elemental Abundance ◽  
Ultramafic Rocks ◽  
Mining Activities ◽  
Central Java ◽  
Parent Rocks ◽  
Modern Industry

Scandium (Sc) is important element for its utilization in modern industry. Initial Sc content in the parent rocks primary importance controlling the Sc concentrations in its weathered derivatives. This contribution examines the Sc concentrations in parent rocks of mafic and ultramafic rocks related to the ophiolite series in Luk Ulo Complex, Karangsambung, Central Java, Indonesia. The ophiolite series in this area are basalt, microgabbronorite, gabbronorite, websterite, and serpentinite from 5 locations of Medana, Lokidang, Parakansubah, Selogiri, and Pucangan areas. The general trend from the distribution of Sc in the ophiolite sequence of Medana and Parakansubah-Lokidang Rivers suggests the Sc contents increase from shallow to deeper levels of the sequence. The lowest concentrations of Sc in the ophiolite sequence of Medana and Parakansubah-Lokidang Rivers are in basalt, which are 24–29 ppm. In the middle sequence, the Sc concentrations are 27–34 ppm and 24–43 ppm, respectively in microgabbronorite and gabbronorite. The highest Sc concentrations are in websterite, which are 51–54 ppm, as the deepest sequence of the ophiolite in this area. Meanwhile, Sc contents in serpentinite from Selogiri and Pucangan areas are 5–11 ppm, which are considered the lowest Sc contents. It suggests that the pre-serpentinization mineral composition rather than the process of serpentinization determine the elemental abundance of Sc in serpentinite. The results are used to be an analog for Sc identification in the ophiolite belts in central Indonesia. This also considering that Luk Ulo Complex been established as National Geopark of Karangsambung-Karangbolong, so that mining activities are prohibited in this area.

scholarly journals Unique Ultra-Rich Rare Metal Ores of the Tomtor Complex and Problem of Their Genesis

2019 ◽  
Vol 5 ◽  
pp. 70-88
Author(s):  
A.V. Lapin ◽  
A.V. Tolstov ◽  
I.M. Kulikova
Keyword(s):  
Mineral Composition ◽  
Rare Metal ◽  
Genetic Models ◽  
Textural Features ◽  
Weathering Crusts ◽  
Geologic Setting

Main genetic models of the formation of ultra-rich rare metal ores of the Tomtor deposit (Yakutia) are compared on the basis of their structural-textural features, mineral composition, and geologic setting: 1) reducing epigenesis of laterite weathering crusts of carbonatites and 2) redeposition of weathering products of carbonatites. It is shown that the unique features of the Tomtor deposit are explained by more complex (compared with other deposits of weathering crusts of carbonatites) evolution, which is expressed in two consecutive stages of supergenesis: laterite weathering and reducing epigenesis and their total ore-concentrating efects. The searching-forecast criteria for ores of the Tomtor type are suggested on the basis of epigenetic model of their formation.

PECULIARITIES OF DISTRIBUTION AND COMPOSITION OF BETAFITE FROM DIFFERENT FORMATIONS OF THE ALDAN SHIELD (SAKHA-YAKUTIA)

2019 ◽  
pp. 8-15
Author(s):  
V. Guliy ◽  
I. Poberezhska ◽  
N. Bilyk
Keyword(s):  
Chemical Composition ◽  
Mineral Composition ◽  
Oxygen Isotopes ◽  
Carbonate Rocks ◽  
Aldan Shield ◽  
Mineralogical Composition ◽  
Significant Feature ◽  
Carbon And Oxygen Isotopes ◽  
Primary Composition ◽  
Geological Formations

Character of Nb and Ta distribution in the different geological formations of the Aldan Shield are given in this article. To get idea about betafite from different endogenic etalon formations the authors analyzed its well known locations in the pegmatites, skarns, carbonatites, metasomatites and late veins segregations. Geological setting and mineralogical composition of the apatite-bearing rocks from the Aldan Shield are described, and the most significant in scale metamorphosed carbonate and silicate varieties among them have been distinguished. Apatite mineralization in magnesium skarns and metasomatites is developed locally. Titanite and betafite are the main concentrators of Nb and Ta and apatite is typical accompanying mineral in the studied rocks. Betafite was detected in the pegmatite bodies from magnesium skarns and metasomatites of the Shield with irregular distribution within rocks rich and poor in apatite, but was not found in the most developed apatite-carbonate rocks which are regarded as ores of the Seligdar type, so it cannot be mineralogical indicator for this type of ores. Late carbonate generations are significantly enriched in light carbon and oxygen isotopes in contrast to positive δ13Ñ values in apatitecarbonate bodies of the Seligdar deposit and its family and the highest δ18Î values. We used these indicators to distinguish origin of the rocks with various carbonate generations, which have different amounts of betafite. Appearance of betafite is determined by primary composition of the initial rocks. Chemical composition of betafites from the skarns and metasomatites is similar, but with local variations. The most significant feature of the mineral composition is very low Ta content. Titanite is characterized by variable amounts of Nb and Ta in scale of sectors as well as within separate grains.

scholarly journals MINERAL COMPOSITION OF LONICERA CAERULEA PHYTOMASS IN CONTRASTING GEOCHEMICAL ENVI-RONMENTS

2018 ◽  
pp. 129-138
Author(s):  
Ирина (Irina) Георгиевна (Georgievna) Боярских (Boyarskikh) ◽  
Александр (Аleksandr) Иванович (Ivanovich) Сысо (Syso) ◽  
Татьяна (Tat'yana) Ивановна (Ivanovna) Сиромля (Siromlya)
Keyword(s):  
Trace Elements ◽  
Mineral Composition ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Organ Distribution ◽  
Lonicera Caerulea ◽  
Normal Environment ◽  
High Concentrations ◽  
Study Sites ◽  
Basic Rocks

To study mineral composition of honeyberry (Lonicera caerulea L.) phytomass in contrasting geochemical environments, the accumulation of macro- and trace elements, as related to their soil content in undisturbed Mountainous Altai ecosystems,  was determined in organs of the Altai subspecies of honeyberry, growing in the geochemically anomalous environment on ultrabasic rocks and in the geochemically normal environment. Total chemical element content in soil and plants was determined by atomic emission spectrometry, while labile forms of  К, Na, Ca, Mg, Fe, Mn, Zn, Cu, Ni, Li, Sr were measured by atomic adsorption spectrometry. Organ distribution and variation limits were determined for 30 macro- and trace elements. Leaves were shown to accumulate Sr, Ni, Mo, B, Ga, La and Zr more intensively in comparison with stems, while the latter accumulated more intensively Al, Cu, Mn and Zn. Plants grown on ultrabasic rocks had decreased Ca, K, Fe and Sr contents and increased Mg and Ni contents as compared with plants growing  on acidic, carbonated and basic rocks. Decreased rate of K, Ca and Sr uptake by honeysuckle plants was most likely due to the mineral exchange distortion because of soil Ca/Mg ratio, which was unfavourable for plants. Leaves of plants growing on the ultrabasic rocks were shown to accumulate Ni in high concentrations. Increased Fe accumulation was found in leaves of plants growing on basic rocks, while stems had increased Fe concentrations in all study sites. The obtained results should be carefully considered for the purposed of phytomass collection and preparation for medicinal use.

scholarly journals Heavy Metal Pollution and Mobility in Soils within a Landfill Vicinity: A South African Case study

2019 ◽  
Vol 35 (4) ◽  
pp. 1286-1296 ◽  
Author(s):  
Joan Mwihaki Nyika ◽  
Ednah Kwamboka Onyari ◽  
Megersa Olumana Dinka ◽  
Shivani Bhardwaj Mishra
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Heavy Metal Contamination ◽  
Natural Occurrence ◽  
Potential Hazard ◽  
Icp Ms ◽  
Parent Rocks ◽  
High Concentrations

Heavy metal contamination in soils results from anthropogenic and lithologic factors and is a potential hazard to land and water resources. Sources of such pollution include landfills, domestic sewage, agricultural fertilisers and industries. In this work, soils from Roundhill landfill vicinity in South Africa were sampled and analyzed to determine the concentrations of particular heavy metals, namely As, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn. The main objectives of this work were to: quantify the concentration levels of heavy metals in the soil; determine the mobility of the heavy metals in the soil; and establish their origins and interrelationships. The soils were collected at various distances and depths from the landfill facility. The concentrations of heavy metals in the soil samples were analysed by ICP-MS and statistical analysis was carried out to establish their relationships and sources. From the analysis, some elements including Cr, Mn, Cu and Ni had measured concentrations beyond the threshold limits in most sampling sites irrespective of their distance and depth from the landfill vicinity. Conversely, some elements were observed to be immobile and had higher concentrations on the top soils closer to the landfill, such as As, Pb, Zn, Co and V. Iron (Fe) had high concentrations in all the sampling sites due to its natural occurrence in the parent rocks. In conclusion, the potential of soil quality deterioration due to heavy metal pollution in a landfill vicinity was observed. Furthermore, all heavy metals observed showed positive correlation to each other except for As and Co, indicating same origin.

scholarly journals Garnet-amphibole miaskites of the Ilmenogorsky miaskite massif (Southern Urals): Mineralogy and geochemistry

LITOSFERA ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 652-667
Author(s):  
A. B. Nemov
Keyword(s):  
Mineral Composition ◽  
Microprobe Analysis ◽  
Southern Urals ◽  
Crustal Material ◽  
Research Subject ◽  
Accessory Minerals ◽  
Low Concentrations ◽  
Garnet Composition ◽  
Icp Ms ◽  
High Concentrations

Research subject. This paper presents original findings about textural-structural, mineralogical, petrological, and geochemical features of the garnet-amphibole miaskites (firstes) of the Ilmenogorsky miaskite massif.Materials and methods. The microprobe analysis of mineral composition was performed using Tescan Vega3 sbu and REMMA202M scanning microscopes equipped with microanalyzers. The content of major, trace and rareearth elements (REE) in rock samples was determined by the methods of AAS and ICP-MS.Results. The garnet-amphibole miaskites under study are characterized by a rare mineral paragenesis, i.e. garnet-amphibole-pyroxene-nepheline-plagioclase. The mafic minerals exhibit a high ferruginosity (f = 70–99), while the accessory minerals have high Al, F and low REE contents. The garnetamphibole miaskites contains high concentrations of Al, Fe3+, Ca, Na, Be, Rb, Mo, Tl and low concentrations of LILE, HFSE, REE and transit elements.Conclusions. According to the garnet composition and its ferruginosity (f = 95– 99), high contents of Al and F in accessory minerals, the prevalence of Fe3+, as well as negative Eu/Eu* and positive Ce/ Ce* anomalies, the garnet-amphibole miaskites under study are assumed to be the product of acid-alkaline metasomatism occurring under the oxidizing conditions of petrogenesis. The low ratios of Cr/V and Ni/Co indicate the immobility of transit elements during metasomatism, and their clarke of concentration corresponds to the content in metaterrigenous and metacarbonate rocks, which suggests crustal substratum for garnet–amphibole miaskites. Garnet-amphibole miaskites are the markers of the interaction of crustal material with deep fluids, which occurred during the stage of shear tectonics development (270–240 Ma) due to the broad permeability of the rocks composing the Ilmenogorsky miaskite massif.

scholarly journals SPECIFIC FEATURES OF CLAY MINERALS IN ANCIENT CRUSTS OF WEATHERING OF VARIOUS ROCKS IN DIAMONDIFEROUS REGIONS

2019 ◽  
pp. 13-20
Author(s):  
N. N. Zinchuk
Keyword(s):  
Carbonate Rocks ◽  
Weathering Crust ◽  
Ordered Structure ◽  
Mixed Composition ◽  
Lower Paleozoic ◽  
Material Development ◽  
Structural Types ◽  
Bivalent Cations ◽  
Layered Formation ◽  
Weathering Crusts

Results of complex research of different age ancient weathering crusts in various rocks (terrigenous-carbonate rocks of Lower Paleozoic, dolerites, tuffs and tufogene formations, kimberlites) within the main diamondiferous regions of the Siberian platform indicated that complicated multicomponent composition of initial formations (with the exception of terrigenous-carbonate rocks), containing di- and trioctahedral minerals, the structure of which has tri- and bivalent rock-forming elements, stipulated decelerated transformation of the initial material. Development of incomplete weathering profiles is first of all caused by weak ejection of bivalent cations from primary minerals. That is why newly emerging phases will be dioctahedral and often preserve mixed composition of cations. The most important typomorphic indications of clay formations in the studied weathering crusts are as follows: a) omnipresent dioctahedral hydromica (2М1) in the weathering crust of terrigenouscarbonate rocks and its association in the most mature profiles with kaolinite of relatively ordered structure, than of kaolinite, having been formed at the expense of other rocks; b) constant availability of trappean formation (tuffs, tufogene rocks, dolerites) in sections of crusts of weathering together with di- and trioctahedral montmorillonite, as well as disordered vermiculite-montmorillonite mixed-layered formation, to this or that degree disordered kaolinite, associated in the weathering crust of tufogene rocks with halloysite (at complete absence of micaceous minerals in the products of weathering); c) the content in the crust of weathering of kimberlites together with polycationic montmorillonite of a significant quantity of trioctahedral chlorite (packets δ and δ'), serpentine (structural types A and B) and altered to various degree phlogopite, including related with it hydromica 1M.

scholarly journals Drought effects on the mineral composition of the leaves of Actinidia species

2021 ◽  
Vol 53 (4) ◽  
pp. 710-722
Author(s):  
N.V. Tetyannikov ◽  
N.V. Кozak ◽  
D.V. Panischeva ◽  
M.E. Mertvischeva ◽  
М.S. Gins ◽  
...  
Keyword(s):  
Drought Stress ◽  
Mineral Composition ◽  
Global Climate ◽  
Major Elements ◽  
Mineral Elements ◽  
Stress Conditions ◽  
Limiting Factors ◽  
Soil Drought ◽  
Scientific Center ◽  
High Concentrations

Against the background of global climate change, drought stress has become one of the environmental limiting factors that can significantly influence the growth and development of crop plants. Drought stress conditions also cause changes in plant physiological and metabolic processes. The influence of soil drought on the mineral composition of the leaves of two Actinidia species with С3-type photosynthesis, namely, Actinidia argutа (Siebold & Zucc.) Planch. ex Miq. cultivar ‘Taezhny Dar’ and Actinidia kolomikta (Maxim. & Rupr.) Maxim. cultivar ‘Narodnaya’, was studied through energy dispersive spectrometry. The investigations were carried out during 2020 to 2021 at the Department of Genofonde and Bioresources of Plants, Federal Scientific Center for Horticulture, Moscow. The present research revealed that actinidia leaves contained the following major elements: K (11.19 mass% to 13.84 mass%), Ca (7.83% to 12.08 mass%), Cl (6.20 mass% to 7.33 mass%), and Mg (2.98 mass% to 3.44 mass%). Low values were recorded for Mo (1.19 mass% to 4.49 mass%) and P (0.83 mass% to 1.25 mass%). In both species, the mineral elements K and Ca were present at high levels. A positive correlation was observed between Mg–P, K–Mn, Mn–Se, Cu-Se, P–Si, Na–Mo, and Si–Mn in the leaves of A. argutа and between Cl–Ca, Mo; P–Si, Mo; and K–Ca in the leaves of A. kolomikta. Under stress conditions, the ratios of K/Ca and K/P declined to 0.9 and 6.3, respectively, whereas those of K/Cl, K/Mg, and K/Mo increased to 3.8, 4.4, and 2.7, respectively. The present studies confirmed that actinidia leaves contained high concentrations of minerals, especially K, Ca, P, and Mg, and that the accumulation of mineral elements in actinidia plant leaves under drought conditions varied depending on the species.

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