Results 71 to 80 of about 31,485 (279)
Yankuang ceshi, 2018 BACKGROUND Microscopy and Electron Microprobe are the main methods for the study of gold-bearing minerals. Using these methods, the content and morphology of gold-bearing minerals and their spatial relationship with other minerals were studied in the ...
JING Guo-qiang +4 more
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Geological Journal, EarlyView.The composition of intrusive rocks suggests that the magma was likely generated in a subduction‐related setting. The arc crustal thickness in the Phnom Sro Ngam and Halo Prospects was probably < 40 km during emplacement. Zircon U–Pb age range indicates a correlation with Loei Fold Belt magmatic activity.
Sirisokha Seang +6 more
wiley +1 more source
Electrochemical study on Surface Oxidation of Natural Pyrite in Ferric Sulfate Solution
International Journal of Electrochemical Science, 2019 Surface oxidation of natural massive pyrite in 0.5 M sulfuric acid solutions with different ferric concentrations was investigated. The electrode of natural pyrite was made and its behavior was measured using cyclic voltammetry (CV), linear sweep ...
Guobao Chen, Hongying Yang
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The kinetics of the dissolution of chalcopyrite in chloride media [PDF]
, 2009 One of the most important outstanding problems with the hydrometallurgy of copper is the low temperature leaching of chalcopyrite. In this thesis, a fundamental study at low temperature was undertaken in order to establish a mechanism, which is ...
Velásquez Yévenes, Lilian
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Geological Journal, EarlyView.Chemical states of Se and Br atoms in the KPg boundary sediments from Stevns Klint were studied using XAFS spectroscopy. The high concentrations of Se4+ could become an index of the degree to which the global environment was soiled with dust and ash derived from impact ejecta or volcanic eruptions.
Kei‐ichiro Murai +5 more
wiley +1 more source
THE DETERMINATION OF SULPHUR IN PYRITES. [PDF]
Journal of the American Chemical Society, 1895 n ...
openaire +1 more source
The sequestration of phosphate by iron phases in the sediments from Lake Rotorua, New Zealand [PDF]
, 2007 A sequential extraction method was used to determine which dominant sedimentary mineral phase was involved in phosphorus retention in the sediments of Lake Rotorua and to verify the importance of iron phases in the role as a phosphorus sink. The observed
Mangan, Carmel Mary
core
Microbial oxidation of Fe21 and pyrite exposed to flux of micromolar H2O2 in acidic media [PDF]
, 2013 At an initial pH of 2, while abiotic oxidation of aqueous Fe21 was enhanced by a flux of H2O2 at micromolarconcentrations, bio-oxidation of aqueous Fe21 could be impeded due to oxidative stress/damage inAcidithiobacillus ferrooxidans caused by Fenton ...
Lin, C, Ma, Yingqun, Ma, Y, Lin, Chuxia
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Geological Journal, EarlyView.U–Pb isotope and trace element geochemistry of apatite from carbonatites of Peshawar Plain Alkaline Igneous Province, western Himalaya shows Permo‐Carboniferous magmatism, an additional magmatic pulse during Cretaceous, and post‐magmatic hydrothermal/metasomatism during Oligocene. ABSTRACT U–Pb isotope and trace element geochemistry of apatite combined
Mehboob ur Rashid +9 more
wiley +1 more source
Framboidal pyrite shroud confirms the ‘death mask' model for moldic preservation of ediacaran soft-bodied organism [PDF]
The mechanisms by which soft-bodied organisms were preserved in late Ediacaran deep-marine environments are revealed by petrographic and geochemical investigation of fossil-bearing surfaces from the Conception and St. John's groups (Newfoundland, Canada).
Liu, Alexander G.
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