2 edition of Some factors of significance in the formation of sedimentary metal sulphides found in the catalog.
Some factors of significance in the formation of sedimentary metal sulphides
Rolf O. Hallberg
Bibliography: p. 65-66.
|Statement||by Rolf O. Hallberg.|
|Series||Acta Universitatis Stockholmiensis., v. 15:4|
|LC Classifications||QE1 .S976 vol. 15, no. 4|
|The Physical Object|
|Pagination||39-66 p., (2) p. 1 leaf of plates.|
|Number of Pages||66|
|LC Control Number||77358119|
Concentrations of Cd, Co, Pb, and Zn in riverbed sediments from six sampling stations along the Sungai Kilim, Langkawi, Malaysia, were determined by using the Teflon Bomb Digestion. From this study, the concentrations of heavy metals in riverbed sediments were found ranging between and μ g/g dry weight for Co, and >μg/g dry weight for Cd, and μg/g. metal sulphides, total 5 Gt. Very large resources of sulphur also occur in gypsum and anhydrite, coal and oil shale, although economic extraction of sulphur from such deposits is not viable. New South Wales Occurrences The only significant occurrences of sulphur in New South Wales are as sulphide in base metal ore deposits.
A detailed multiple S and Fe isotope analysis (e.g., Hofmann et al., ) of allogenic pyrite grains of the Black Reef Formation revealed a mixture of magmatic and sedimentary sources. analysed. In a laboratory sediment model consisting of sand and chopped Zostera marina leaves, the sulfur cycle and the succession and zonation patterns of sulfur bacteria were studied for a period of 7 months. The pool size of different forms of sulfur was quantified, and the rate of sulfate reduction was measured with an in situ radio-tracer technique at regular intervals.
Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and typically form recognizable and mappable volumes. Rocks are commonly divided into three major classes according to the processes that resulted in their formation. These classes are (1) igneous rocks, which have solidified from. The thickness of the Pandurra Formation ranges up to one kilometre in some drill hole intersections, but may be more in some regions. The Pandurra Formation is a succession of relatively flat-lying continental redbed sedimentary rocks comprised of four units, a basal gritty sandstone rich in lithics; a shale and siltstone unit; a fine- to.
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Some factors of significance in the formation of sedimentary metal sulphides. Some factors of significance in the formation of sedimentary metal sulphides. Hallberg, Rolf O. Stockholm University, Faculty of Science.
(English) Book (Other academic) Place, publisher, year, edition, pages Stockholm: Almqvist & Wiksell,p. Metal sulphides are a highly important group of minerals as they are the major source of most of the world's non-ferrous metals, occurring in large concentrated orebodies, and also as minor, but significant, accessory minerals in a wide variety of rocks, some of.
The formation of marcasite remains something of a mystery. Syntheses of FeS 2m require pH formation becomes rapid as pH sedimentary systems.
Endogenous Magmatic processes. Fractional crystallization: separates ore and non-ore minerals according to their crystallization early crystallizing minerals form from magma, they incorporate certain elements, some of which are crystals may settle onto the bottom of the intrusion, concentrating ore minerals there.
Chromite and magnetite are ore minerals that form in. Sedimentary rock-hosted stratiform base metal sulfide deposits are the product of basin-or subbasin-scale fluid flow systems.
S.K. Haldar, in Mineral Exploration, Cutting Factors. Many of the base metal (Cu, Pb) and the majority of the precious metal (Au, Ag, Pt, Pd) deposits show occasional or frequent high sample values.
These values are considered to be erratic and designated as nugget value. Some of the estimators of exploration and mining companies prefer to introduce a cutting factor i.e.
Magmatic Massive Sulphides Deposit Ni-Cu-Co Type The three most crucial factors for the formation of large and super-large magmatic sulfide deposits are: (1) a large volume of mantle-derived mafic-ultramafic magma s that participated in the formation of the deposits.
Description This book deals with sedimentary sulfides which are the most abundant authigenic minerals in sediments. Special emphasis is given to the biogeochemistry that plays such a central role in the formation of sedimentary sulfides.
Shales often contain metal sulphides, and some metal sulphide ore deposits exhibit stratiform and stromatolitic structures (Maynard, ). In particular, the Kupferscheifer Shale that extends across Northern Europe is mineralized with copper, zinc and lead sulphides, which occur in vertically distinct hor- izontal bands.
After providing the principles, the heart of the book discusses recent advances, including: binary metal oxides-based supercapacitors, nanotechnology, ternary metal oxides, polyoxometalates and hybrids. Moreover, the factors affecting the charge storage mechanism of metal oxides are explored in detail.
The formation processes of metal sulfides in sediments, especially iron sulfides, have been the subjects of intense scientific research because of linkages to the global biogeochemical cycles of iron, sulfur, carbon, and oxygen.
The formation of other metal sulphides M eS is influenced by kinetic constraints, whi ch may significantly differ among trace metals. Morse and Luther () demonstrated that M n, Zn.
Deposits associated with felsic volcanic and sedimentary rocks contain minor to significant concentrations of lead, silver, arsenic, antimony, cadmium, and locally bismuth, tin, and selenium.
Ore and gangue mineralogy and zonation The dominant sulfide mineral in most VMS deposits is pyrite, but pyrrhotite is dominant in others. Sedimentary rock-hosted stratiform copper deposits form by movement of oxidized, copper-bearing fluids across a reduction front that results in the precipitation of copper sulfides.
Whether this is a primary feature of the magma, a primary alteration feature related to the formation of the sulphide deposits (i.e.,leaching of metals from lavas to form the sulphides), or a secondary alteration feature consequent upon the processes of deposition of the sulphides cannot be determined on avail- able data.
Van-Arkel (and de-Boiser) process is based on the thermal decomposition of a volatile compound like an iodide, which is first formed by direct combination of metal to be purified and iodine. The metallic iodide is then decomposed when heated at a higher temperature and thus the metal obtained in the purest form.
Fluids circulating during upflow or lateral flow below the sediment-seawater interface can precipitate sulphides within fractures, interstices and open spaces, or by replacement of less stable.
A first-order control on the localization of mineral deposits is tectonic setting that, in turn, controls other factors favorable for the formation of mineral deposits.
These factors include: formation and composition of the associated igneous bodies, formation of sedimentary basins and the characteristics of sediments that fill the.
A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
The word 'concretion' is derived from the Latin con meaning 'together' and crescere meaning 'to grow'. There has been a great deal of research into the formation of sedimentary iron sulfide minerals because their history is intertwined with the biogeochemical cycles of iron, sulfur, carbon, and oxygen (Berner, ).Iron sulfides occur in sediments from a wide range of depositional environments, from the deep sea to the nonmarine, and the principal mineral in the rock record is pyrite (FeS 2.
Sedimentary environments. The sedimentary environment is the specific depositional setting of a particular sedimentary rock and is unique in terms of physical, chemical, and biological characteristics.
The physical features of a sedimentary environment include water depth and the velocity and persistence of currents. Chemical characteristics of an environment include the salinity (proportion.Controversy regarding the formation of the Mount Isa copper orebodies in the ‘silica dolomite’ has been a little more difficult to settle, but in spite of some dissent19,20 the current consensus amongst most geologists favours a syngenetic and sedimentary-exhalative origin, like the silver-lead-zinc orebodies.
1,7, Las Cruces is a base-metal deposit in the Iberian Pyrite Belt, one of the world’s best-known ore provinces. Here we report the occurrence of major Pb .