OF LAKE SUPERIOR IRON Currently the only source of domestic iron ore. In recent years, Lake Superior ores provided ... An iron range is an elongate belt of layered sedimentary rocks in which one or more layers consist of banded iron-formation, a rock composed of alternating iron-rich and iron-poor layers on a scale of a few centimeters. Banded ...
Kent C. Condie, in Earth as an Evolving Planetary System (Third Edition), 2016 Banded Iron Formation. Banded iron formation or BIF is a chemical sediment, typically thin-bedded or laminated with > 15% iron of sedimentary origin (Figure 8.6).BIF has a very distinct distribution with time (Figure 8.25).It is found in minor amounts in the early Archean and in large amounts …
Commodities (Major) - Iron Deposit Type: Banded Iron-Rich Sedimentary Deposits Development Status: Past Producer Deposit Model: 241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)
The classic Lake Superior banded iron-formations, including those in the Marquette, Gogebic, Mesabi and Gunflint Iron Ranges, formed in that sea. The newly established subduction zone caused continued arc volcanism until about 1850 Ma when a fragment of Archean crust, now the basement of the Marshfield terrane, arrived at the subduction zone.
Superior type Rapitan type. ... In banded iron formations the Fe and Si appear to. Have been derived from the ocean itself rather than a continental source as is the case for ironstones. ... Lake superior BIFs seem to be spatially unrelated to volcanic activity.
of Lake Superior-type banded iron-formation (XWfi) (Gross, 1965; James, 1983), which in the northern hemisphere characteristically is Early Proterozoic in age (Gross, 1980, p. 218). STRUCTURE Four episodes of compressional deforma tion, designated D1 through D4, are recorded in the supracrustal rocks and their basement in
So far it is also one of the significant types of banded iron formations formed during the Paleoproterozoic (Superior-type). They formed on firm continental shelves. Superior-type accumulations are in vast dimensions (greater than 100 meters in …
deposition of giant iron formations, as they are coeval with, and genetically linked to, time periods when large igneous provinces (LIPs) were emplaced. Superior-type iron formation first appeared at ca. 2.6 Ga, when con-struction of large continents changed the heat flux at the core-mantle boundary. From ca. 2.6 to ca. 2.4 Ga,
Las formaciones de hierro bandeado (BIF, Banded Iron Formation) son rocas sedimentarias que contienen al menos un 15% de hierro (Fe),  y presentan una estructura formada por bandas, estando unas compuestas por el hierro, y las otras por sílex.  El hierro suele aparecer en forma de óxidos, normalmente magnetita (Fe 3 O 4) y hematita (Fe 2 O 3). 
In the iron-rich areas around Lake Superior, there are deposits of banded iron formation. In addition to being called banded iron formation, many rockhounds label specimens as Jasperite, Jaspite, or Jaspelite. This is a distinctive type of rock found in Precambrian sedimentary rocks.
IMPORTANCE: In Canada, Algoma-type iron-formations are the second most important source of iron ore after the taconite and enriched deposits in Lake Superior-type iron- formations. Algoma-type iron-formations are widely distributed and may provide a convenient local source of iron ore. REFERENCES. El Shazly, E. M. (1990): Red Sea Deposits; in ...
In the Lake Superior region of North America, deposition of most banded iron formations (BIFs) ended abruptly 1.85 Ga ago, coincident with the oceanic impact of the giant Sudbury extraterrestrial bolide. We propose a new model in which this impact produced global mixing of shallow oxic and deep anoxic waters of the Paleoproterozoic ocean, creating a suboxic redox …
The most positive δ53Cr values occur in the open-shelf, Lake Superior type BIF, especially those of Ediacaran age. ... tion of Rapitan type banded …
The Lac Lamêlée iron deposit consists of magnetite Banded Iron Formation ("BIF") of the Lake Superior type. The Property area was subjected to high-grade metamorphism corresponding to the limit of upper amphibolite-granulite facies resulting from the Grenville Orogeny.
193 (2017) 24.1km SW. Commodities (Major) - Iron. Deposit Type: Banded Iron-Rich Sedimentary Deposits. Development Status: Past Producer. Deposit Model: 241: Superior Fe (BC name is Lake Superior & Rapitan types iron-formation) Host Rock Unit: Vulcan Iron Formation. Host Rock: Iron Formation.
Ojakangas, R.W., 1983. Tidal deposits in the early Proterozoic basin of the Lake Superior region—the Palms and Pokegama Formations: evidence for subtidal shelf deposition of Superior-type banded iron-formation. In Medaris, L.G. Jr. (ed.), Early Proterozoic Geology of the Great Lakes Region. Geological Society of America Memoir, 60, pp. 49–66.
Mar 08, 2015· Banded iron formations (BIF) are iron-rich (15–40wt.% Fe2O3) ... atively uncommon but has been observed in Superior-type BIF in the Lake Superior region, Canada (Van Hise and Leith, 1911), in the Kuruman Iron Formation, South Africa (Beukes, 1973) and
Aug 17, 2006· Lake Superior Type (LST) banded iron formation (BIF) was investigated as a spectral and possible process analog to these deposits. In northern Michigan, LST BIF formed in a sedimentary, continental shelf or shallow basin environment under stable tectonic conditions, and the oxide facies contains gray, crystalline hematite.
Aug 01, 2016· 1. Introduction. Algoma-type BIFs are thinly bedded, chemical sedimentary rocks comprising alternating layers of iron-rich minerals and chert. These rocks are typically intercalated with Eoarchean to late Paleoproterozoic volcano-sedimentary sequences within greenstone belts (Goodwin, 1973, Bekker et al., 2010).They differ from Superior-type BIFs …
of Lake Superior type Protero-zoic banded iron formations, and possibly the transition to a sulfidic ocean. At a highway outcrop, the group collected our own samples of the impactite including a very large piece that will be featured in the Geol-ogy Museum's new astrobiology display. On our third day in Canada, we continued
Lake Superior-type banded iron formations were chemically precipitated on marine continental shelves and in shallow basins. They are commonly interlayered with other sedimentary or volcanic rocks such as shale and tuff . Most Lake Superior-type banded iron formations formed during the Paleoproterozoic, between 2.5 and 1.8 billion years ago.
By contrast, Lake Superior-type banded iron formations primarily formed during the Paleoproterozoic era, and lack the europium anomalies of the older Algoma-type BIFs, suggesting a much greater input of iron weathered from continents. Absence of oxygen or hydrogen sulfide.
Lake Superior Type (LST) banded iron formation (BIF) was investigated as a spectral and possible process analog to these deposits. In northern Michigan, LST BIF formed in a sedimentary, continental shelf or shallow basin environment under stable tectonic conditions, and the oxide facies contains gray, crystalline hematite.
shallow sea rift basins on top of the older Archean rocks (2, 4; Figure 2). The Superior-type banded iron formations of the Lake Superior region were deposited during this episode. While these sedimentary rocks were deposited in northern Minnesota and Michigan's Upper Peninsula, to the south in Wisconsin a volcanic arc was
Types of Chert and Banded iron formation. Some rocks according to their use or texture are classified into different types. Know more about Chert Texture and Banded iron formation Texture.Types of Chert are Flint, Jasper, Radiolarite, Common Chert, Chalcedony, Agate, Onyx, Opal, Magadi-type Chert, Porcelanite, Siliceous Sinter whereas the types of Banded iron …
BIFs are globally distributed, with some of the larger formations being those of the Hamersley range in Australia and the Transvaal Supergroup in South Africa (Figures 1 and 2).Other major BIFs include Krivoy Rog Supergroup, Ukraine (2.2 Ga); Labrador Trough, Canada; Lake Superior Region, USA; Gunflint and Biwabik, North America (2.2–2.0 Ga), Carajás Formation (2.6 Ga) …
The Sishen mine extracts the lump ore from a large haematite ore body hosted by a Lake Superior-type banded iron formation (BIF) called Kuruman Formation of the Asbestos Hills Subgroup. The lump-to-fine ratio of Sishen in 2019 was 71:29. The ore body measures approximately 14km-long, 3.2km-wide and 400m-deep.
Richard W. Ojakangas, 1983. "Tidal deposits in the early Proterozoic basin of the Lake Superior region—The Palms and the Pokegama Formations: Evidence for subtidal-shelf deposition of Superior-type banded iron-formation", Early Proterozoic Geology of …
Algoma-type banded iron formations Algoma type BIFs are associated with volcanic arcs and are typically found in Archean greenstone belts. Lake Superior-type banded iron formations The majority of Lake Superior, or simply Superior, type BIFs are located on stable continental platforms and were mainly deposited in Paleoproterozoic times.
Banded iron-formation (BIF), the precursor to low- and high-grade BIF-hosted iron ore, consists of Archean and Paleoproterozoic Algoma-type BIF (e.g. Serra Norte iron ore district in the Carajás Mineral Province), Proterozoic Lake Superior-type BIF (e.g. deposits in the Hamersley Province), and Neoproterozoic Rapitan-type BIF (e.g. the Urucum ...
The Lake Superior-type Cauê banded-iron Formation lies on Caraça metasediments. The Cauê Formation is a carbonate sequence of the Gandarela Formation. Lying locally unconformably on the Gandarela Formation, the Piracicaba Group comprises a thick pile of shallow-water and deltaic strata.
The Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and western Ontario along the north shore of Lake Superior. The black layers in the sequence contain microfossils that are 1.9 to 2.3 billion years in age. Stromatolite colonies of cyanobacteria that have been converted to jasper are found in …
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