sedimentary iron deposits
2020-05-06T18:05:39+00:00
Mineral deposit Iron deposits Britannica
Sedimentary iron deposits, from which almost all iron is obtained, can therefore be viewed as one of the world’s great mineral treasures There are two major types of deposit The first, and by far the most important, is banded iron formations (BIFs), so called Abstract Iron formations, evaporites, and phosphorites are economically important chemical sedimentary rocks developed in basins which span a very large fraction of geologic time Since they are chemical precipitates, they must reflect the character of the body of water from which they were formed Our group attempted to determine whether Sedimentary Iron Deposits, Evaporites and Economic significance of the sedimentary iron ore deposits is shown The most important types of these deposits are characterized and their genesis is considered Special attention is given to the formation of goethitechloritesiderite ooliths, which represent the Facies types of sedimentary iron ore deposits and Most marine sedimentary iron deposits consist of hematite A few deposits are characterized by sedimentary siderite, such as at the Daxigou iron deposit Most continental sedimentary iron deposits are characterized by siderite The iron deposits are large in size, but recovery is difficult The iron deposits have an average grade of 3638% TFeTypes and geological characteristics of iron deposits Iron deposits hosted in sedimentary rocks in Afghanistan mainly are present within the Proterozoic sedimentary and volcanosedimentary rock packages Most are present along the tectonized zone in the center of the country This includes the large Haji Gak iron ore deposit and nearby occurrences (figs 811 and 812)80 Chemicalsedimentary deposits USGS
Origin of sedimentary hosted highgrade iron ore deposits
• Sedimentary hosted iron ore deposits account for ~ 90% of current iron production worldwide • Most production comes from highgrade (> 55% Fe) iron ore deposits hosted in Precambrian iron formations From Bekker et al, 2010 Ideas driven by demand • This tectonic setting is consistent with the favored geologic model in which the large iron and manganese deposits form on shallow continental margin shelves The laterally continuous banding of these deposits also supports a stable tectonic settingThe major early Proterozoic sedimentary iron and deposits of both iron and manganese are of sedimentary origin At present, highgrade iron ore deposits formed by hydrothermal and supergene enrichment of Proterozoic banded iron formations constitute the most important source for iron ores, with only some magmatic and skarntype iron ore deposits being mined Economically important manganese oreIron and Manganese Ore Deposits: Mineralogy, The sedimentary ironformations of Precambrian age in the Lake Superior region can be divided on the basis of the dominant original iron mineral into four principal facies: sulfide, carbonate, oxide, and silicate As chemical sediments, these rocks reflect certain aspects Sedimentary facies of ironformation Economic 2 Sedimentary iron ore deposits: (i) Iron stones: They are noncherty, oolitic, poorly banded, and largely of Phanerozoic age (ii) Iron formations: They are typically laminated with chert, generally nonoolitic, and largely (but not exclusively) of Precambrian age Banded Iron Formation bearCHAPTER5 GEOCHEMISTRY OF IRON ORES
Origin of sedimentary hosted highgrade iron ore deposits
• Sedimentary hosted iron ore deposits account for ~ 90% of current iron production worldwide • Most production comes from highgrade (> 55% Fe) iron ore deposits hosted in Precambrian iron formations From Bekker et al, 2010 Ideas driven by demand • AG Mueller: Iron ore deposits 1 2/08/19 A short review of Precambrian and Phanerozoic sedimentary iron (± Mn, P) ore deposits Review and explanatory notes of photographs by Andreas G Mueller, 12a Belgrave Street, Maylands WA 6051, Australia Email: July 2019 Contents Page 1A short review of Precambrian and Phanerozoic section 70 Sedimentary iron deposits are abundant in central parts of Afghanistan and the Haji Gak iron deposit is of worldclass size sufficient to support a major mining operation Additional resources to those already known at Haji Gak and in other locations are likely 81 Sedimentary rockhosted iron deposits Contribution by Stephen G 80 Chemicalsedimentary deposits USGS 2 Iron Ore Deposits Iron ore deposits are known to occur in sedimentary, hydrothermal, and magmatic environments, but production today is almost entirely from three types of deposit: deposits related to Precambrian banded iron formations provide about 90% of all iron ore mined, and the remainder is derived from metasomatic skarn and magmaticIron and Manganese Ore Deposits: Mineralogy, The sedimentary ironformations of Precambrian age in the Lake Superior region can be divided on the basis of the dominant original iron mineral into four principal facies: sulfide, carbonate, oxide, and silicate As chemical sediments, these rocks reflect certain aspects Sedimentary facies of ironformation Economic
The major early Proterozoic sedimentary iron and
The recognition of Wilson cycle plate subduction in the early Proterozoic and the proposed amalgamation of a Proterozoic supercontinent from 2000 to 1800 Ma offers new insight into the tectonic setting of the large sedimentary basins of this age, which host the vast bulk of the world's resources of iron and manganese in the very large Superiortype banded ironformationsMaterials of sedimentary deposits have been derived chiefly from: 1) weathering of rocks 2) weathering and oxidation of former mineral deposits viz, iron, manganese, copper 3) some material constituting sedimentary deposits may have passed through an intermediate organic stage The earth’s crust contains on average 56% FeOre Deposits Formed by SedimentationThe Labrador iron deposits are composed of iron formations of the Lake Superiortype The Lake Superiortype iron formation consists of banded sedimentary rocks composed principally of bands of iron oxides, magnetite and hematite within quartz (chert)rich rock, with variable amounts of silicate, carbonate and sulphide lithofaciesLabrador Iron Mines Holdings Limited :: Deposit TypesSEDIMENTARY ORE DEPOSITS Commercial deposits of metals come in a seemingly endless variety formed by many different geological processes Successful exploration for these accumulations, now that most of those easily spotted on the surface have been found, requires a knowledge of the processes responsible for their formation and the timing of those processes Contact ores – Iron ore deposits formed at or near the contact between igneous rocks and sedimentary rocks are normally composed of magnetite and hematite with associated carbonates and pyrite The ore deposits are usually in the sedimentary rocks as irregular or tabular replacement bodiesGeology, Prospecting and Exploration for Iron Ore
Origin of sedimentary hosted highgrade iron ore deposits
• Sedimentary hosted iron ore deposits account for ~ 90% of current iron production worldwide • Most production comes from highgrade (> 55% Fe) iron ore deposits hosted in Precambrian iron formations From Bekker et al, 2010 Ideas driven by demand • section 70 Sedimentary iron deposits are abundant in central parts of Afghanistan and the Haji Gak iron deposit is of worldclass size sufficient to support a major mining operation Additional resources to those already known at Haji Gak and in other locations are likely 81 Sedimentary rockhosted iron deposits Contribution by Stephen G 80 Chemicalsedimentary deposits USGS 2 Iron Ore Deposits Iron ore deposits are known to occur in sedimentary, hydrothermal, and magmatic environments, but production today is almost entirely from three types of deposit: deposits related to Precambrian banded iron formations provide about 90% of all iron ore mined, and the remainder is derived from metasomatic skarn and magmaticIron and Manganese Ore Deposits: Mineralogy, China has the largest global demand for iron ore resources, with more than 50% of its demand presently being met from foreign sources Iron resources are abundant in China (ca 80 billion tons of proven iron ores), but highgrade ores are scarce Most iron deposits in China are low in grade, with an average grade of 3062% TFe The iron deposits in China are divided into six types: sedimentary Types and geological characteristics of iron deposits The recognition of Wilson cycle plate subduction in the early Proterozoic and the proposed amalgamation of a Proterozoic supercontinent from 2000 to 1800 Ma offers new insight into the tectonic setting of the large sedimentary basins of this age, which host the vast bulk of the world's resources of iron and manganese in the very large Superiortype banded ironformationsThe major early Proterozoic sedimentary iron and
Sedimentary rock Ironrich sedimentary rocks
Sedimentary rock Sedimentary rock Ironrich sedimentary rocks: Almost all sedimentary rocks are ironbearing in the sense that mudrocks, sandstones, and carbonates typically have an iron content of several percent Nevertheless, sedimentary rocks in which the proportion of iron exceeds 15 percent are separately categorized as ironrich Two major types of ironrich sedimentary rocks are Materials of sedimentary deposits have been derived chiefly from: 1) weathering of rocks 2) weathering and oxidation of former mineral deposits viz, iron, manganese, copper 3) some material constituting sedimentary deposits may have passed through an intermediate organic stage The earth’s crust contains on average 56% FeOre Deposits Formed by Sedimentation gomatype iron formations are interlayered with or stratigraphically linked to submarineemplaced volcanic rocks in greenstone belts and, in some cases, with volcanogenic massive sulfide (VMS) deposits In contrast, larger Superiortype iron formations are developed in passivemargin sedimentary rock successions and generIron Formation: The Sedimentary Product of a Complex Contact ores – Iron ore deposits formed at or near the contact between igneous rocks and sedimentary rocks are normally composed of magnetite and hematite with associated carbonates and pyrite The ore deposits are usually in the sedimentary rocks as irregular or tabular replacement bodiesGeology, Prospecting and Exploration for Iron Ore Halite, sylvite, gypsum, anhydrite deposits occur in the same sedimentary sequences Sandstone uranium, unconformity uranium, basalt copper, iron oxide copper gold deposits, and Kipushi CuPbZn deposits can occur in the same districts DEPOSIT DESCRIPTION Mineralogy All deposits contain one or more of the following minerals deposited inSedimentHosted Copper Deposits of the World: Deposit
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