scholarly journals Thallium, nickel, cobalt and other trace elements in iron sulfides from belgian lead-zinc vein deposits

1983 ◽  
Vol 18 (S2) ◽  
Author(s):  
J.C. Duchesne ◽  
A. Rouhart ◽  
C. Schoumacher ◽  
H. Dillen
Keyword(s):  
Trace Elements ◽  
Iron Sulfides ◽  
Nickel Cobalt ◽  
Lead Zinc ◽  
Vein Deposits

Petrography and Geochemistry of Some Basic Sills and Dykes from Southern Rhenish Schiefergebirge

1967 ◽  
Vol 104 (1) ◽  
pp. 35-45 ◽  
Author(s):  
E. G. Schulze ◽  
Essam E. El-Hinnawi
Keyword(s):  
Trace Elements ◽  
Geochemical Characteristics ◽  
Lead Zinc

AbstractThe petrographical and geochemical characteristics of some basic sills and dykes from Southern Rhenish Schiefergebirge are described. The dykes are generally more altered than the sills and are classified into two types according to their relation to the lead-zinc veins found in the area. The distribution of some trace elements in the sills and dykes is given and the nature and mechanism of alteration are discussed.

scholarly journals Green Rust: The Simple Organizing ‘Seed’ of All Life?

Life ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 35 ◽  
Author(s):  
Michael Russell
Keyword(s):  
Carbon Dioxide ◽  
Hydrothermal Vents ◽  
Green Rust ◽  
Iron Sulfides ◽  
Banded Iron Formations ◽  
Variable Valence ◽  
Earth’S Mantle ◽  
Nickel Cobalt ◽  
Iron Formations ◽  
Emergence Of Life

Korenaga and coworkers presented evidence to suggest that the Earth’s mantle was dry and water filled the ocean to twice its present volume 4.3 billion years ago. Carbon dioxide was constantly exhaled during the mafic to ultramafic volcanic activity associated with magmatic plumes that produced the thick, dense, and relatively stable oceanic crust. In that setting, two distinct and major types of sub-marine hydrothermal vents were active: ~400 °C acidic springs, whose effluents bore vast quantities of iron into the ocean, and ~120 °C, highly alkaline, and reduced vents exhaling from the cooler, serpentinizing crust some distance from the heads of the plumes. When encountering the alkaline effluents, the iron from the plume head vents precipitated out, forming mounds likely surrounded by voluminous exhalative deposits similar to the banded iron formations known from the Archean. These mounds and the surrounding sediments, comprised micro or nano-crysts of the variable valence FeII/FeIII oxyhydroxide known as green rust. The precipitation of green rust, along with subsidiary iron sulfides and minor concentrations of nickel, cobalt, and molybdenum in the environment at the alkaline springs, may have established both the key bio-syntonic disequilibria and the means to properly make use of them—the elements needed to effect the essential inanimate-to-animate transitions that launched life. Specifically, in the submarine alkaline vent model for the emergence of life, it is first suggested that the redox-flexible green rust micro- and nano-crysts spontaneously precipitated to form barriers to the complete mixing of carbonic ocean and alkaline hydrothermal fluids. These barriers created and maintained steep ionic disequilibria. Second, the hydrous interlayers of green rust acted as engines that were powered by those ionic disequilibria and drove essential endergonic reactions. There, aided by sulfides and trace elements acting as catalytic promoters and electron transfer agents, nitrate could be reduced to ammonia and carbon dioxide to formate, while methane may have been oxidized to methyl and formyl groups. Acetate and higher carboxylic acids could then have been produced from these C1 molecules and aminated to amino acids, and thence oligomerized to offer peptide nests to phosphate and iron sulfides, and secreted to form primitive amyloid-bounded structures, leading conceivably to protocells.

Temporal and spatial variations of mercury, lead, zinc, and copper in sediments of the Saguenay fjord

1981 ◽  
Vol 18 (6) ◽  
pp. 1065-1074 ◽  
Author(s):  
C. Barbeau ◽  
R. Bougie ◽  
J.-E. Côté
Keyword(s):  
Trace Elements ◽  
Production Control ◽  
Anthropogenic Source ◽  
Western Basin ◽  
The North ◽  
Saguenay Fjord ◽  
Lead And Zinc ◽  
Lead Zinc ◽  
Sediment Profiles ◽  
Temporal And Spatial

Sediment profiles of 19 cores from the Saguenay fjord, Québec, Canada, have been analyzed for mercury, lead, zinc, and copper. Core dating of post-1940 sediments is possible with above background concentrations of mercury. The results agree well with those obtained previously with 137Cs. The northern basin of the fjord is the site of a major accumulation of trace elements. The chronological distribution of mercury follows the events related to the operation of a chlor-alkali plant: construction, increased production, control of losses, and closing. The effect of a major landslide in 1971 is clearly shown in many sediment profiles. The western basin of the fjord contains sediments enriched in mercury, lead, and zinc. Mercury input in the fjord has diminished since 1970 but other trace element influxes keep increasing. Trace elements in the north basin correlate well with carbon. Atmospheric lead appears to be a major anthropogenic source in sediments of the western basin.

Trace Elements Geochemistry of Soil-Plant System in Puxiong Lead-Zinc Mining Area, Yunnan, China

2013 ◽  
Vol 726-731 ◽  
pp. 239-244
Author(s):  
Juan Wang ◽  
Zheng Hai Wang
Keyword(s):  
Trace Elements ◽  
Correlation Coefficients ◽  
Mining Area ◽  
High Concentration ◽  
Transition Area ◽  
Lead Zinc ◽  
Measured Ratio ◽  
Concentration Factors ◽  
High Concentrations ◽  
The Relationship

This study aims to obtain an overview of trace elements concentrations in rocks, soils and plants from Puxiong lead-zinc mining area in Yunnan, China, and analyze the connection as well. Concentrations of Ba, Cd, Co, Cu, Mn, Pb, Zn, As, Sb, Hg, Sn, Ni and Sr among soils, rocks and three dominant plants in mining area, transition area and background were measured. Ratio parameter, bioconcentration factors (BF) and Pearson's correlation coefficients were used to analyze the relationship between these elements in different feature. The results indicate that rocks, soils and plants samples are all characterized by high concentrations of Pb, Zn and other associated elements in Puxiong lead-zinc mining area. Geochemistry of trace elements concentrations from rocks to soils, then to plants presents obvious characters of inheritance and variability. Whats more, three dominant plants are same in high concentration of Mn and low concentration of Cd, Hg, Co, but are huge different in bio-concentration factors.

scholarly journals Bioaccumulation of heavy metals in the dice snake Natrix tessellata (Reptilia, Colubridae) from ecosystems of different anthropogenic loads in modern conditions of the steppe Dnieper area

2019 ◽  
Vol 30 (2) ◽  
pp. 113-117
Author(s):  
S. V. Yermolenko ◽  
V. Ya. Gasso ◽  
A. M. Hagut ◽  
I. A. Hasso ◽  
V. A. Spirina
Keyword(s):  
Heavy Metals ◽  
Trace Elements ◽  
Bone Tissue ◽  
Thermal Power ◽  
Zinc Content ◽  
Atomic Absorption Spectrophotometry ◽  
Natural Ecosystems ◽  
Lead Zinc ◽  
Nature Park ◽  
Cadmium Lead

We studied the peculiarities of bioaccumulation and distribution of heavy metals (cadmium, lead, zinc and copper) in the bone tissue, liver and kidneys of the dice snake Natrix tessellata (Laurenti, 1768) inhabited ecosystems under different anthropogenic loads in 2015-2016. Mature individuals were caught in anthropogenically transformed ecosystems of the sanitary-protective zone of the Dniprovska Thermal Power Plant (SPZ DTPP) (48.402°N, 35.111°E, n = 7), coastal ecosystems of the National Nature Park «Velykyi Luh» (47.443°N, 35.149°E, n = 8) and in the Maiorka gully ecosystems (48.260°N, 35.170°E, n = 7). The gross content of metals in the organs of N. tessellata was determined after their dry ashing in a muffle furnace. Determination of the trace elements was performed by atomic absorption spectrophotometry. Among the studied trace elements, zinc has the highest concentrations in the liver, kidneys and bones of N. tessellata. The kidneys and liver are characterized by such amount of concentrations: Zn> Cu> Pb> Cd, but bone tissue has the following ratio Zn> Pb> Cu> Cd. The highest concentration of cadmium is found in the kidneys, and the lowest one – in the bones of snakes. There are the highest contents of lead and copper in the snakes’ liver, but the lowest in the kidneys and bones. The lead bioaccumulations in organs of snakes from different ecosystems are dissimilar. Zinc content in bones is higher than in kidneys and liver, but the lowest concentration is found in the kidneys. It has been found that the highest contents of toxic metals (Cd, Pb) were in the kidneys and liver of the snakes dwelled in the SPZ DTPP ecosystems in comparison with both studied natural ecosystems. In addition, snakes caught in anthropogenically transformed ecosystems of SPZ DTPP are characterised by increased zinc content in all studied organs and enlarged copper concentration in the kidneys. Considering the obtained results on the metals bioaccumulation, the dice snake can be considered as a potential bio-indicator of environmental pollution by heavy metals.

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