scholarly journals ОЦЕНКА МАСШТАБОВ И СТЕПЕНИ НЕГАТИВНОГО ВОЗДЕЙСТВИЯ ФИАГДОНСКОГО ХВОСТОХРАНИЛИЩА НА ЭКОСИСТЕМУ

2020 ◽  
Author(s):  
А.Г. Гурбанов ◽  
А.Б. Лексин ◽  
В.М. Газеев ◽  
О.А. Гурбанова ◽  
А.Б. Лолаев ◽  
...  
Keyword(s):  
Soil Contamination ◽  
Quantitative Methods ◽  
Convective Cell ◽  
Lower Jurassic ◽  
Industrial Wastes ◽  
Geochemical Data ◽  
Base Metals ◽  
Tailing Dump ◽  
Icp Ms ◽  
Preliminary Extraction

Актуальность исследований: выявлены дополнительные доказательства необхо- димости комплексной утилизации захороненных промышленных отходов с предварительным извлечением из них экономически ценных, включая благородные и экологически опасные метал- лы; выявлена высокая степень загрязнения почв в долине р. Хаником-дон. Цель исследований: на основании геохимических данных определить масштабы и степень загрязнения почв на территории, прилегающей к Фиагдонскому хвостохранилищу. В статье, на основании результатов геохимических исследований почв сельхозугодий (огородов) в поселе- ниях Куыртат и Горный Дзуарикау и природных пастбищ (ПП), проведенных количественными методами (РФА и ICP MS), оценены степень и масштабы их загрязнения промышленными отхо- дами, хранящимися в Фиагдонском хвостохранилище. Впервые приведены данные о содержании экономически ценных и экологически опасных элементов в почвах огородов и природных паст- бищ и рассмотрена геохимическая роль почвообразующих аргиллитов нижнеюрского возраста в формировании почв. Показано, что механизм загрязнения почв обусловлен ветровой эрозией поверхностного слоя хвостохранилища, а затем и из катастрофических воронок на его по- верхности. Кроме того, на основании результатов анализов, показавших резко повышенные содержания в аргиллитах базовых металлов (Fe, Cu, Zn, Ba, Pb, As), высказано предположение о наличии еще одного природного источника загрязнения почв ПП – почвообразующих аргилли- тов, так как в процессе длительного формирования в горных условиях почв ПП они вполне мог- ли обогатиться указанными выше базовыми металлами. Подчеркнуто, что наличие высоких концентраций базовых металлов в нижнеюрской аргиллитовой толще дало возможность пред- полагать, что эти металлы могли быть мобилизованы с помощью механизма «конвективной ячейки», согласно латераль-секреционной гипотезе, из черносланцевой толщи аргиллитов с формированием промышленно значимых рудных жильных тел полиметаллических месторожде- ний Кадат и Какадур. Research relevance: revealed additional evidence of the need for complex disposal of buried industrial waste with preliminary extraction of economically valuable, including noble and environmentally dangerous metals; revealed a high degree of soil contamination in the valley of the Khanikom-don river. Research objective based on geochemical data is to determine the extent and degree of soil contamination in the territory adjacent to the Fiagdon tailing dump. In the article, based on the results of geochemical studies with quantitative methods (XRF and ICP MS) of soils of agricultural lands (orchards) in the Kurtat and Mountain Dzuarikau settlements and from natural pastures, estimated the extent and magnitude of contamination by industrial wastes stored in the Fiagdon tailing dump. Data on the content of economically valuable and environmentally dangerous elements in the soils of vegetable gardens and natural pastures are presented for the fi rst time, and the geochemical role of soil-forming mudstones of the lower Jurassic age in the formation of soils is considered. It is shown that the mechanism of soil contamination is caused by wind erosion of the surface layer of the tailing dump, and then from catastrophic craters on its surface. In addition, based on the results of analyses showing sharply increased content of base metals in mudstones (Fe, Cu, Zn, Ba, Pb, As), it is suggested that there is another natural source of soil contamination of NP - soil-forming mudstones. Because during the long-term formation of NP soils in mountain conditions, they may well have been enriched with the above-mentioned base metals. It is emphasized that the presence of high concentrations of base metals in the lower Jurassic mudstone column made it possible to assume that these metals could be mobilized using the "convective cell" mechanism according to the lateral-secretion hypothesis, from the black-shale mudstone column with the formation of industrially signifi cant ore vein bodies of the Kadat and Kakadur polymetallic deposits.

scholarly journals The first data about the variations in the content of macro- and microelements and precious metals in vertical sections in industrial wastes of the Fiagdon tailing dump (Republic of North Ossetia - Alania)

2019 ◽  
Vol 487 (1) ◽  
pp. 69-72
Author(s):  
A. G. Gurbanov ◽  
O. A. Bogatikov ◽  
A. B. Leksin ◽  
V. M. Gazeev ◽  
O. A. Gurbanova ◽  
...  
Keyword(s):  
Quantitative Methods ◽  
Precious Metals ◽  
Point Of View ◽  
Industrial Wastes ◽  
Tailing Pond ◽  
Tailing Dump ◽  
Economic Point ◽  
Icp Ms ◽  
First Time ◽  
North Ossetia

The new data published firstly obtained by quantitative methods (XRF and ICP MS) on the terms of the average content of macro- and microelements in industrial wastes of the Fiagdon tailing dump exceed the data used for calculation of the metals reserves stored in tailing pond. While elevated content of precious metals, especially Platinum, revealed for the first time. This makes more attractive measure from an economic point of view. The development of a method for the complete utilization of waste, with the extraction of economically valuable and environmentally hazardous elements.

Soil Contamination by Microplastics in Relation to Local Agricultural Development as Revealed by FTIR, ICP-MS and Pyrolysis-GC/MS

2021 ◽  
Author(s):  
khawla chouchene ◽  
Tommaso Nacci ◽  
Francesca Modugno ◽  
Valter Castelvetro ◽  
Mohamed Ksibi
Keyword(s):  
Soil Contamination ◽  
Agricultural Development ◽  
Icp Ms

scholarly journals Comparison of Magma Oxygen Fugacity and Zircon Hf Isotopes between Xianglushan Tungsten-Bearing Granite and Late Yanshanian Granites in Jiangxi Province, South China

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 106
Author(s):  
Xing-Yuan Li ◽  
Jing-Ru Zhang ◽  
Chun-Kit Lai
Keyword(s):  
Oxygen Fugacity ◽  
South China ◽  
Granitic Magma ◽  
Geochemical Data ◽  
Jiangxi Province ◽  
Magmatic Zircon ◽  
Late Mesozoic ◽  
Icp Ms ◽  
T Values ◽  
Southern Jiangxi Province

Jiangxi Province (South China) is one of the world’s top tungsten (W) mineral provinces. In this paper, we present a new LA-ICP-MS zircon U-Pb age and Hf isotope data on the W ore-related Xianglushan granite in northern Jiangxi Province. The magmatic zircon grains (with high Th/U values) yielded an early Cretaceous weighted mean U-Pb age of 125 ± 1 Ma (MSWD = 2.5, 2σ). Zircon εHf(t) values of the Xianglushan granite are higher (−6.9 to −4.1, avg. −5.4 ± 0.7) than those of the W ore-related Xihuanshan granite in southern Jiangxi Province (−14.9 to −11.2, avg. −12.5 ± 0.9), implying different sources between the W ore-forming magmas in the northern and southern Jiangxi Province. Compiling published zircon geochemical data, the oxygen fugacity (fO2) of the late Yanshanian granitic magmas in Jiangxi Province (the Xianglushan, Ehu, Dahutang, and Xihuashan plutons) were calculated by different interpolation methods. As opposed to the W ore-barren Ehu granitic magma, the low fO2 of the Xianglushan granitic magma may have caused W enrichment and mineralization, whilst high fO2 may have led to the coexistence of Cu and W mineralization in the Dahutang pluton. Additionally, our study suggests that the absence of late Mesozoic Cu-Mo mineralization in the Zhejiang, Jiangxi, and Anhui Provinces (Zhe-Gan-Wan region) was probably related to low fO2 magmatism in the Cretaceous.

scholarly journals Widespread Permian granite magmatism in Lower Austroalpine units: significance for Permian rifting in the Eastern Alps

2020 ◽  
Vol 113 (1) ◽  
Author(s):  
Sihua Yuan ◽  
Franz Neubauer ◽  
Yongjiang Liu ◽  
Johann Genser ◽  
Boran Liu ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Eastern Alps ◽  
Geochemical Data ◽  
Calc Alkaline ◽  
Three Samples ◽  
High K ◽  
Icp Ms ◽  
Granite Magmatism ◽  
Austroalpine Unit ◽  
Granite Suite

Abstract The Grobgneis complex, located in the eastern Austroalpine unit of the Eastern Alps, exposes large volumes of pre-Alpine porphyric metagranites, sometimes associated with small gabbroic bodies. To better understand tectonic setting of the metagranites, we carried out detailed geochronological and geochemical investigations on the major part of the porphyric metagranites. LA–ICP–MS zircon U–Pb dating of three metagranites sampled from the Grobgneis complex provides the first reliable evidence for large volumes of Permian plutonism within the pre-Alpine basement of the Lower Austroalpine units. Concordant zircons from three samples yield ages at 272.2 ± 1.2 Ma, 268.6 ± 2.3 Ma and 267.6 ± 2.9 Ma interpreted to date the emplacement of the granite suite. In combination with published ages for other Permian Alpine magmatic bodies, the new U–Pb ages provide evidence of a temporally restricted period of plutonism (“Grobgneis”) in the Raabalpen basement Complex during the Middle Permian. Comparing the investigated basement with that of the West Carpathian basement, we argue that widespread Permian granite magmatism occurred in the Lower Austroalpine units. They belong to the high-K calc-alkaline to shoshonitic S-type series on the base of geochemical data. Zircon Hf isotopic compositions of the Grobgneis metagranites show εHf(t) values of − 4.37 to − 0.6, with TDM2 model ages of 1.31–1.55 Ga, indicating that their protoliths were derived by the recycling of older continental crust. We suggest that the Permian granitic and gabbroic rocks are considered as rifted-related rocks in the Lower Austroalpine units and are contemporaneous with cover sediments.

scholarly journals Heavy Metal Soil Contamination Detection Using Combined Geochemistry and Field Spectroradiometry in the United Kingdom

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 762 ◽  
Author(s):  
Salim Lamine ◽  
George Petropoulos ◽  
Paul Brewer ◽  
Nour-El-Islam Bachari ◽  
Prashant Srivastava ◽  
...  
Keyword(s):  
Heavy Metal ◽  
United Kingdom ◽  
Soil Contamination ◽  
Contaminated Soils ◽  
Prediction Models ◽  
Geochemical Data ◽  
Spectral Features ◽  
Metal Concentrations ◽  
Heavy Metal Concentrations ◽  
Spectral Libraries

Technological advances in hyperspectral remote sensing have been widely applied in heavy metal soil contamination studies, as they are able to provide assessments in a rapid and cost-effective way. The present work investigates the potential role of combining field and laboratory spectroradiometry with geochemical data of lead (Pb), zinc (Zn), copper (Cu) and cadmium (Cd) in quantifying and modelling heavy metal soil contamination (HMSC) for a floodplain site located in Wales, United Kingdom. The study objectives were to: (i) collect field- and lab-based spectra from contaminated soils by using ASD FieldSpec® 3, where the spectrum varies between 350 and 2500 nm; (ii) build field- and lab-based spectral libraries; (iii) conduct geochemical analyses of Pb, Zn, Cu and Cd using atomic absorption spectrometer; (iv) identify the specific spectral regions associated to the modelling of HMSC; and (v) develop and validate heavy metal prediction models (HMPM) for the aforementioned contaminants, by considering their spectral features and concentrations in the soil. Herein, the field- and lab-based spectral features derived from 85 soil samples were used successfully to develop two spectral libraries, which along with the concentrations of Pb, Zn, Cu and Cd were combined to build eight HMPMs using stepwise multiple linear regression. The results showed, for the first time, the feasibility to predict HMSC in a highly contaminated floodplain site by combining soil geochemistry analyses and field spectroradiometry. The generated models help for mapping heavy metal concentrations over a huge area by using space-borne hyperspectral sensors. The results further demonstrated the feasibility of combining geochemistry analyses with filed spectroradiometric data to generate models that can predict heavy metal concentrations.

How to disclose local equilibrium in subducted metapelites from the Cima Lunga Unit (Central Alps)

2020 ◽  
Author(s):  
Francesca Piccoli ◽  
Pierre Lanari ◽  
Jörg Hermann ◽  
Thomas Pettke
Keyword(s):  
High Pressure ◽  
Early Stage ◽  
Local Equilibrium ◽  
White Mica ◽  
Geochemical Data ◽  
Ultramafic Rocks ◽  
Central Alps ◽  
Large White ◽  
Icp Ms ◽  
Polyphase Inclusions

<p>Subducted metapelites are more prone to re-equilibrate during exhumation than mafic or ultramafic rocks to the point that recognizing high-pressure (HP) relicts is often very challenging. Geologic evidence from the Cima Lunga Unit (Central Alps) show this apparent discrepancy between high to ultra-high pressure metamorphism (28 kbar and 780 °C) recorded in mafic/ultramafic lenses, and Barrovian metamorphism (<10 kbar, 650°C) in the adjacent metapelitic rocks. We collected a white mica – garnet – biotite – plagioclase – kyanite (+ quartz, + zircon, + rutile) bearing metapelite adjacent to the garnet metaperidotite lens that displays an apparently well equilibrated Barrovian mineral assemblage (garnet + plagioclase + biotite), with no macroscopic or microtextural indication of a HP and/or HT metamorphic event (e.g. omphacite crystals; migmatitic texture; polyphase inclusions). Nevertheless, microstructures like atoll-like garnet or large white mica flakes surrounded by biotite and ilmenite replacing rutile suggest incomplete re-equilibration. We investigated garnet and phengite crystals by electron probe and laser ablation-ICP-MS mapping. Major and trace element mapping reveals very complex mineral zoning in both minerals. In particular, high Ti content in phengite and increasing P and Zr contents in pyrope-rich garnet indicate that the studied rock underwent a HP-HT event. This is also supported by Zr in rutile thermometry that indicates temperatures well above the Barrovian metamorphism (T > 700 °C). We combined detailed textural analysis with petrological-geochemical data and thermodynamic modelling to reconstruct the metamorphic evolution of the studied rock. We show that, thank to incomplete re-equilibration, the rock documents an evolution from prograde to UHP-HT peak (27 kbar and 800 °C) to retrograde (Barrovian) conditions (10 kbar and 620 °C). Noteworthy, peak metamorphic conditions of metapelite coincide with peak metamorphic conditions of the garnet metaperidotite. Lastly, geochemical evidence for minor wet melting of the studied metapelite at HP-HT conditions was recognized and is likely linked to the dehydration of chlorite to form garnet peridotite in the adjacent ultramafic body. We propose that metapelites and ultramafic rocks were coupled before subduction or at least in its early stage. This finding opens new scenarios for the geodynamic interpretation of the Cima Lunga unit. We propose that the ultramafic lenses at Cima di Gagnone were parts of the exhumed and serpentinised mantle emplaced at the hyper-extended European continental margin of the Piemont-Ligurian ocean. Slices of the margin were detached and tectonically mixed in the subduction channel. These new constraints call for re-evaluation of the paleogeographic position of the Adula-Cima Lunga nappe.</p>

scholarly journals High-resolution stalagmite stratigraphy supports the Late Holocene tephrochronology of southernmost Patagonia

2021 ◽  
Author(s):  
Björn Klaes ◽  
Gerhard Wörner ◽  
Katrina Kremer ◽  
Klaus Simon ◽  
Denis Scholz ◽  
...  
Keyword(s):  
High Resolution ◽  
South America ◽  
Large Volume ◽  
Critical Region ◽  
Late Holocene ◽  
Volcanic Ash ◽  
Explosive Volcanism ◽  
Geochemical Data ◽  
Karst Cave ◽  
Icp Ms

Abstract Volcanic ash layers are important markers for the chronostratigraphy of paleoclimate and paleoenvironmental archives at the southern tip of South America. However, this requires that tephras are well-dated. We report geochemical data from the MA1 stalagmite formed in a non-karst cave near Mt. Burney volcano in southernmost Patagonia (~53°S). High-resolution LA-ICP-MS analyses, SEM imagery, and NanoSIMS enable to identify volcanogenic signals during the last 4.5 kyrs BP from sub-annual trace element variations and tephra particles in distinct laminae. The new 230Th/U-chronology of MA1 provides precise dating of tephra from Mt. Burney (MB) and Aguilera (A) at 4216 +93/−193 yrs BP (MB2), 2291 ± 33 yrs BP (MB3), 853 +41/−60 yrs BP (MB4) and 2978 +91/−104 yrs BP (A1). This unique high-resolution record of MA1 holds potential to date further eruptions from Southern Andean volcanoes for the tephrochronology in this critical region, and potentially also large-volume explosive volcanism off South America.

scholarly journals Health Hazards Assessment and Geochemistry of ElSibai-Abu ElTiyur Granites, Central Eastern Desert, Egypt

2021 ◽  
Vol 11 (24) ◽  
pp. 12002
Author(s):  
Essam Sidique ◽  
Mervat A. Elhaddad ◽  
Sayed F. Abdelwahab ◽  
Hany H. El Hadek
Keyword(s):  
Inductively Coupled Plasma ◽  
Building Materials ◽  
Eastern Desert ◽  
Mass Spectrometry Analysis ◽  
World Health ◽  
Geochemical Data ◽  
Radiological Protection ◽  
Spectrometry Analysis ◽  
Average Value ◽  
Icp Ms

In this paper, a thorough radio- and chem-ecological evaluation of ElSibai-Abu ElTiyur granites located within Egypt’s crystalline basement rocks was conducted for risk and dose assessments. Twenty granitic samples from the study area’s various lithological units were analyzed using high-resolution γ-ray spectrometry to determine the natural radioisotopes (U-238, Th-232, and K-40) concentrations. The average concentrations of U-238, Th-232, and K-40 were 38.72, 38.23, and 860.71 Bq/kg, respectively, exceeding the GAV (global average value) documented by UNSCEAR (Scientific Committee on the Effects of Atomic Radiation, Vienna, Austria). The radiological parameters and indices judging the usage of ElSibai-Abu ElTiyur granites in homes were computed. The obtained results showed that ElSibai-Abu ElTiyur granites are safe to be used by inhabitants as superficial building materials, as per the globally accepted values and the recommended safety limits approved by UNSEAR, WHO (World Health Organization, Geneva, Switzerland), ICRP (International Commission on Radiological Protection, Ottawa, ON, Canada), and EC (European Commission, Luxembourg). Further, the samples were subjected to ICP-MS (inductively coupled plasma mass spectrometry) analysis for quantifying radionuclide variations with chemical composition. Geochemically based on the ICP-MS results, the studied granites proved to be highly evolved A-type granites. They span the metaluminous to peralkaline fields. The REE patterns are characterized by the enrichment of the light rare earths (LREE) over the heavy ones (HREE) where (La/Yb)n = 5.2, (Gd/Yb)n = 1.63 with pronounced negative Eu-anomalies (Eu/Eu*)n = 0.49. The albite granite exhibits the highest concentrations of Ga, Nb, Ta, U, and Y, and REE (Gd, Dy, Ho, Yb) than the Na-metasomatic granites. Finally, the obtained data serve as a valuable future database for finding out the compatibility of the geochemical data with the natural radioactivity levels of granites.

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