1 edition of Iron-formations and the Labrador geosyncline found in the catalog.
Iron-formations and the Labrador geosyncline
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CANADIAN PRECAMBRIAN IRON-FORMATIONS: AGES AND TRACE ELEMENT COMPOSITIONS Brian Jackson Fryer Proterozoic mio- and eugeosynclinal rocks surround the Supe-rior Province of Quebec and adjoining Labrador on all sides. They unconformably overlie an Archean basement complex and mark the boundary of the Superior and Churchill Provinces of . Iron formations were found in the Brunswick area as far back as , and were exploited in the subsequent decades. However, Brunswick’s large massive sulphide deposits were only discovered in by a group headed by M.J. Boylen on ground optioned from Bruden Enterprises, which had been scouting the area for sulphur.
In the Labrador Geosyncline the iron formation occurs as a continuous stratigraphic unit more than 1, km long before being disrupted by erosion or structural features. Apparently, a single iron-formation unit was once present around the entire shoreline of the Ungava craton for a distance of more than 3, km. Try the new Google Books Buy eBook - $ developed dolerite dolomite domains dykes Early Proterozoic east eastern emplacement facies faults felsic fold belt Geol Geology Geosyncline gneisses granites granitoid granulite greenstone belts Group Halls Creek Hamersley igneous Inlier intrusion iron formations iron-formation isotopic Kaapvaal.
The book will be dominantly read by students and teachers, but could also be useful for professional geologists wanting a modern overview of a wide range of ore deposits and ore-forming processes. Iron formations: the sedimentary product of a complex interplay among mantle, tectonic, oceanic, and biospheric process. Economic Geology New Quebec Orogon (Labrador Trough; region A in figures) The New Quebec orogen (also known as the Labrador Trough, Figure 1) contains two volcano-sedimentary sequences: Cycle 1, with magmatic ages of Ma; and Cycle-2 with magmatic ages of Ma (Le Gallais and Lavoie ; Skulski et al. ; Clark and Wares ).
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Labrador geosyncline. The whole formation is divided into two strati-graphic units: the lower Wabush iron-formation consisting of quartz-carbonate-silicate-magnetite rocks, and the upper Wabush iron-formation consisting of quartz-specularite-magnetite rocks or the potential ore bodies.
Anthophyllite and mangano-cummingtonite are restricted to the. The Gunflint Iron-formation of western Ontario and the Sokoman Iron-formation of the Labrador–Quebec geosyncline both contain interbeds of coarse-grained volcaniclastic detritus.
Volcaniclastic beds in the Gunflint are typically less than a metre thick and display normal grading and other physical structures typical of high- and low-density by: The Labrador “trough” is the preserved portion of an Early Proterozoic (Aphebian) geosyncline, extending from the Grenville Front at Wabush to Payne Bay, over mi farther north-northwest.
Archaean gneisses constitute the foreland to the west of the geosyncline, and remetamorphosed Archaean gneisses compose much of its eastern by: A geological cross-section of the Labrador miogeosyncline near Schefferville, Québec. Geological Survey of Canada; Paperpages Source: HOFFMAN, P.F.
Early Proterozoic foredeeps, foredeep magmatism and Superior-type iron-formations of the Canadian shield. In: Proterozoic Lithospheric Evolution (A. Kroner, editor). American. The iron-formation of Labrador, commonly m or more thick, occurs within a sequence dominated by quartzite, arkose, slate, and dolomite (Gross, ); its age is between the maximum set by age of basement gneiss, about m.y.
(Baadsgaard et al., ) and a minimum set by age of metamorphism, about m.y., a value thought origmally t o Cited by: One of the typical examples of late Palaeoproterozoic iron formations is the Ga Sokoman Iron Formation in the Labrador Trough, Canada. The world-class late Palaeoproterozoic iron ore deposits.
On the Canadian shield the ages of the major iron-formations of Labrador and the Lake Superior region range between 2, and 1, m.y. The interval of the main deposition was probably much less, since for the iron-formations in Minnesota, thought to be largely contemporaneous with others in North America, a minimum age of 2, m.y.
has been. Deposition of sedi- mentary and volcanic rocks in the Kursk--Krivoy Rog geosyncline took place between and Ga. Deposition of the iron-formations extended from shelf to eugeosynclinal parts of the belt and may have continued intermit- tently through a large part of this period (Alexandrov, ).
Banded iron formation (BIF) is the principal source of iron. BIF is a rock type composed of alternating silica- and iron-rich bands. Banded iron formation is economically among the most important rock types as our society is heavily reliant on. Proterozoic Rocks of the Northern Part of the Labrador Geosyncline, the Cape Smith Belt, and the Richmond Gulf Area was published in The Proterozoic in Canada on page Six iron formations present in the Canadian Shield were examined using this approach.
The Palaeoproterozoic Gunflint Formation consists of strand‐proximal stromatolites and oolitic shoals, transitional distally to grainstones and parallel‐laminated chemical muds. This succession was laid down on a wave‐ and tide‐dominated inner shelf.
The term “Sokoman Iron Formation” was first introduced by geologists at the Labrador Mining and Exploration Company (, in Frarey and Duffell, ) to designate the main cherty ferriferous rock unit in the Schefferville area. fosse du Labrador. bassin s6dimentaire.
INrnopucttoN Study of the geochemistry of iron formations has been in progress for some years in the Geological Survey' of Canada project on the geology of iron deposits.
Our aim is to determine variations and similarities in the composition of different iron-formation types and facies and.
Shabogamo gabbro, an olivine gabbro, intrudes the metamorphosed sedimentary rocks in the Wabush Lake map area, southern part of the Labrador geosyncline. In close spatial relation to this intrusive is an amphibolite schist that appears conformable with these meta-sediments.
Field evidence is by itself insufficient to demonstrate whether this amphibolite schist is a. Consequently, the concept of a Circum – Ungava Geosyncline appears to be valid on geochronological grounds, with geosynclinal development terminating with the onset of the Hudsonian orogeny at about Circum – Ungava Geosyncline contains banded iron-formations exhibiting shallow-water sedimentary structures which distinguish them.
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ADVERTISEMENTS: In this article we will discuss about: 1. Introduction to Formations of Banded Iron 2. Geologic Setting and Depositional Environments of Banded Iron-Formations 3.
Sedimentary Facies 4. World Distribution. Introduction to Formations of Banded Iron: Estimated iron ore resources in the world by the end of are about over 8,00, MT.
(MCS, [ ]. cally much larger than Algoma-type iron formations. Lake Superior-type iron formations are most common in Precambrian sedimentary successions, with peaks in iron sedimentation between ~ and billion years ago (Ga) and again from ~ to Ga.
The Lake Superior-type iron formations of the Labrador Trough formed at. The sequence of the Labrador geosyncline is subdivided in three cycles, each beginning with deposition of shallow-water quartzites and precipitates.
Location and LimitsThe part of the Labrador geosyncline here reviewed extends northward from latitude 58 degrees to about 40 miles north of Payne River.
At the southern limit of this area the geosyncline is approximately 35 miles decreases northward to a width of a few miles in the Hopes Advance Bay area and from there it increases to.
Try the new Google Books. Check out the new look and enjoy easier access to your favorite features. Try it now. Subglacial outburst floods and extreme sedimentary events in the Labrador Sea.
Origin and evolution of large Precambrian iron formations. Smallwood Mine, Labrador, Newfoundland and Labrador, Canada: An iron mine located on the Wabush Iron formation, Labrador geosyncline.
SUPPORT US. Covid has significantly affected our fundraising.Iron-formations and the Labrador Geosyncline: Geological Survey of Canada, Paper(includes geological map showing iron-formation distribution).
Metamorphism of iron-formations and its bearing on their beneficiation: Transactions, The Canadian Institute of Mining and Metallurgy, v. LXIV, p. 24–