Morphology and Relationship with Host Rocks Mode of occurrence of an ore deposit is important from the mining point of view Sedimentary ore deposits are roughly tabular, most others occur in a ,
Banded iron formations are critical to our current economy as they are by far the biggest source of economic iron deposits China and Australia are the world’s largest iron producers, and both have enormous reserves of BIFs Smaller deposits are mined elsewhere including the USA and Canada How Are BIFs Formed
The sedimentary iron-formations 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 ,
3 Sedimentary-Exhalative (SEDEX) Type Deposits “Syngenetic” stratiform, bedded Zn-Pb deposits hosted by fine-grained clastic sedimentary rocks These three types may be considered as a spectrum of base-metal ore deposits which form in sedimentary rocks at some time during the evolution of a sedimentary basin SEDIMENT-HOSTED DEPOSITS
SEDIMENTARY ROCKS Prepared by T Weiland for GEOL 1121 Sedimentary rocks - rocks formed by the accumulation and consolidation of sediments (surficial processes) I Sediments - material that is deposited by wind, water or ice; material that is precipitated from seawater; or deposits of organic origin A Major Components - (clastics, biogenic and chemical precipitates)
Some workers believe that the Proterozoic-hosted iron deposits are also products of contact metamorphism with the Oligocene intrusive bodi 811 Description of sedimentary rock-hosted iron deposit models The main ore minerals within the sedimentary rock-hosted iron deposits in Afghanistan are magnetite and hematite with lesser martite
Volcanogenic sedimentary deposits include large stratified deposits of iron and manganese ores composed of silicates, carbonates, oxides, and hydroxides of the above metals, as well as pyrite ores containing sulfide compounds of iron, copper, and zinc and occasionally lead, barite, and gypsum
The Hogan Mountain deposit represents just one of many vents which fed into these shallow sedimentary basins These deposits probably represent surficial expressions of the same plumbing system that produced the deeper magmatic/hydrothermal iron deposits within the terrane 2004 Denver Annual Meeting (November 7–10, 2004)
May 25, 2019· Ironstone is a name for any sedimentary rock that is cemented with iron minerals There are actually three different kinds of ironstone, but this one is the most typical The official descriptor for an ironstone is ferruginous ("fer-ROO-jinus"), so you could also call these specimens ferruginous shale -- ,
Mineral deposit - Mineral deposit - Iron deposits: By far the most important metal from an economic and technical point of view is iron Sedimentary iron deposits, from which almost all iron is obtained, can therefore be viewed as one of the world’s great mineral treasur There are two major types of deposit The first, and by far the most important, is banded iron formations (BIFs), so .
Sedimentary rock along the White Rim Road at Canyonlands National Park, Utah NPS photo Introduction Sedimentary rocks are formed from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the Earth's surface
manganese "manganese deposits" "manganese minerals" "manganese ores" "Mn deposits" Manganese Manganese is the ninth or tenth most abundant element in the Earth’s crust Most of its industrial use is in steel making with a much lesser amount going into the production of batteri It is very similar to iron in its chemical properti
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
Banded iron formation deposits commonly formed early in Earth’s history, but this type of chemical sedimentary rock is no longer being created Oxygenation of the atmosphere and oceans caused free iron ions, which are water-soluble, to become oxidized and precipitate out of solution
A List to some Major Types of Ore Deposits and a link Book Download , Volcanic-associated massive sulphide deposits Sediment-hosted stratiform base metal deposits Sediment hosted copper deposits Banded iron formations Sedimentary manganese deposits Bauxite deposits Lateritic nickel-cobalt deposits Lateritic & supergene gold deposits .
Much of the world's supply of iron comes from banded iron deposits that formed between 18 and 26 billion years ago In addition to being a source of iron, why are these deposits important in geology? a) mark the point in history when marine mammals were first beginning to evolve b) provide evidence of the earliest known sedimentary rocks
May 18, 2015· SedEx deposits are high grade, with an average size of approximately 70 Mt, and can host about 12 percent lead and zinc SedEx deposits are easily distinguished from many other deposit types by the fact that their formation is the result of minerals being deposited through the discharge of metal-bearing fluids into seawater
Apr 12, 2018· Iron ore is mined in about 50 countries, with Australia, Brazil and China as the largest producers It is mostly used to produce steel Most iron ore deposits are found in sedimentary rocks
Iron ore mining methods vary by the type of ore being mined There are four main types of iron ore deposits worked currently, depending on the mineralogy and geology of the ore deposits These are magnetite, titanomagnetite, massive hematite and pisolitic ironstone deposits
Not all metal deposits have igneous origins- sedimentary deposits can also be a valuable source of many metals, including copper While sedimentary copper deposits share the feature of a .
Start studying Geology Chapter 15 Learn vocabulary, terms, and more with flashcards, games, and other study tools Search , d iron b copper The first widely used alloy in ancient civilizations was _____ a bronze , d sedimentary deposits a hydrothermal deposits MVT (Mississippi-Valley Type) deposits are secondary enrichments .
The ore minerals in most of the world's iron and manganese reserves were chemically precipitated in the ocean and accumulated on the sea floor Placer deposits are heavy metallic minerals, such as iron or titanium minerals, or native gold or diamonds, that have been concentrated by wave or water action in a river or beach environment The .
Sedimentary deposits of iron oxides and hydrous aluminum oxide are of this type In other cases, the ore deposits (or more precisely ore minerals) may be present in an enclosing rock, called the country rock or the host rock
Chemical Deposition of Sedimentary Mineral Deposits In the weathering of rocks, iron and manganese are dissolved as carbonates by water containing carbonic acid, and are carried down to swamps, lakes, and seas, where they have been deposited as beds of ore; under some circumstances they have been deposited as carbonates (siderite and .
Skarn is a relatively simple rock type formed when a magma body intrudes into carbonate sedimentary rocks such as limestone or dolomite At the contact between the two rock types, a collection of course-grained calc-silicate minerals, mostly the minerals garnet and pyroxene, form as a result of .
The text then ponders on origin of the Precambrian banded iron-formations, aspects of the sedimentary petrology of cherty iron-formation, and genetic problems and environmental features of volcanosedimentary iron-ore deposits of the Lahn-Dill Type
volcano-sedimentary iron deposits and the bog iron deposits Dimroth (1977) proposed a classification of iron-rich sedi- ments into three types; (1) detrital chemical sediments encom-
GEOLOGY – Vol IV – Geology of Base-Metal Deposits - Sangster DF ©Encyclopedia of Life Support Systems (EOLSS) deposits either to the present earth’s surface (ie, an outcrop) or sufficiently close to the surface that the deposit can be detected by current ,
The deposits of iron ore which occur as rocks, interstratified or associated with sedimentary beds, have originated through complex processes, sometimes wholly, sometimes partly, of a purely chemical nature and usually more or less influenced by the agencies of organic life
Ore Deposits Formed by Sedimentation The process of sedimentation results in the formation of some important mineral deposits viz, iron, manganese, copper, phosphate, coal, oil shale, carbonates, cement rock, diatomaceous earths, bentonite, fuller’s earth magnesite, sulfur and uranium-vanadium deposits