Gneissic and igneous rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil

Cover of: Gneissic and igneous rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil |

Published by Dept. of the Interior in Washington .

Written in English

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Subjects:

  • Geology - Brazil - Minas Gerais,
  • Brazilian Shield

Edition Notes

11

Book details

The Physical Object
Pagination58 p.
Number of Pages58
ID Numbers
Open LibraryOL22006626M

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Additional Physical Format: Online version: Herz, Norman, Gneissic and igneous rocks of the Quadrilátero Ferrífero, Minas Gerais, Brazil. Gneissic and Igneous Rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil: Usgs Professional Paper B Paperback – Ma by Norman Herz (Author) See all formats and editions Hide other formats and editionsAuthor: Norman Herz.

Gneissic And Igneous Rocks Of The Quadrilatero Ferrifero Brazil book Gerais, Brazil by Hez N and a great selection of related books, art and collectibles available now at Gneissic and igneous rocks of the Quadrilátero Ferrífero, Minas Gerais Norman Herz Not In Library.

Reesor, 2 books P. Banham, 2 books Friedrich Karl Drescher-Kaden, 2 books K. Currie, 1 book Teresa Oberc-Dziedzic, 1 book Reiner Lobst, 1 book K. Raven.

In Amarantina, district of Ouro Preto (State of Minas Gerais, Brazil), ultramafic rock exposures are found along two areas of about m2 each.

ESPINHAÇO, MINAS GERAIS, BRAZIL ABSTRACT Mafic dikes are abundant in the Quadrilátero Ferrífero and Southern Espinhaço regions, southeastern State of Minas Gerais. The dikes range from 1,7 Ga to Ma and form at least three swarms that differ in trend, mineralogy, composition and age. The oldest swarnrhas a baddeleyite U/Pb age of 1,7 Ga.

Petrographic investigations in the area of the Capoeirana emerald deposit, Minas Gerais State, revealed two main lithostructural units. The first unit is comprised of gneissic rocks of granitic composition belonging to the basement complex, and the second is composed of a highly weathered metasedimentary-metavolcanic sequence represented by metapelitic schists.

Universidade Federal de Minas Gerais, Belo Horizonte. o Machado, N.& Carneiro, M.A. U-Pb evidence of late Aechean tectono-thermal activity in the southern São Francisco shield, Brazil. The São Gneissic and igneous rocks of the Quadrilatero Ferrifero craton (Almeida,Almeida, ), which was continuous with the Congo craton of Africa prior to the opening of the South Atlantic, is one of four cratons (), defined in South America as Archean and Paleoproterozoic crustal blocks that were not significantly affected by Brasiliano or younger orogenic encompasses a substantial part of the southern Brazil.

Evolução sedimentar do Supergrupo Minas: Ma de registro geológico no Quadrilátero Ferrífero, Minas Gerais, Brasil Article (PDF Available) in Revista Geonomos 2(1). solution and rocks lining channel-ways, and their implication for the precipitation of gold.

To meet this purpose the alteration and minerali-zation styles of a number of mesothermal gold deposits in the Quadrilátero Ferrífero (QF) region (Figure 1) of the State of Minas Gerais, Brazil, are described.

These are used to review this much-de. Metamorphic rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil: A study of the metamorphic events that have affected the Precambrian igneous rocks of the Brazilian shield [Herz, Norman] on *FREE* shipping on qualifying offers.

Metamorphic rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil: A study of the metamorphic events that have affected the Precambrian igneous.

The Quadrilátero Ferrífero, located in the southern sector of the São Francisco Craton in Brazil (), is famous for its giant iron ore deposits hosted in banded iron formations (BIFs) of the Cauê Formation, Minas Supergroup ( Ga – Cabral et al., ).Older, Meso- to Neoarchean (– Ga) BIFs of the Rio das Velhas greenstone belt are known for hosting.

ABSTRACT. A study of geology and rocks paragenesis has been conducted at the Córrego do Sítio auriferous lineament, containing the Cachorro Bravo, Laranjeiras and Carvoaria metaturbidite-hosted lode-gold deposits located in the Quadrilátero Ferrífero Region, Minas Gerais, Brazil.

minas gerais, brazil, showing areas of gneissic and igneous rocks mapa geolÓgico do quadrilÁtero ferrÍfero, minas gerais, brasil, mostrando as Áreas das rochas gnaÍssicas e Ígneas geology compiled by john van n.

d and by norman herz,from mapping by dnpm—usgs, 62 geologia compilada por john van n de. Abstract. The continued progress in geologic mapping in South America of large areas previously poorly known, the compilation of regional charts, and the growing number of radiometric age determinations has made it possible to outline the major structures of the Precambrian, and to begin to explain the geologic history of the cratonic areas.

(Minas Gerais, Brazil) JOSÉ C.S. CAMPOS1, MAURÍCIO A. CARNEIRO1 and MIGUEL A.S. BASEI2 1Departamento de Geologia da Escola de Minas da Universidade Federal de Ouro Preto (DEGEO/EM/UFOP), Morro do Cruzeiro/Campus Universitário Ouro Preto, MG, Brasil.

OCLC Number: Notes: Title from title screen (viewed October 2, ). "Regional geology of the Quadrilátero Ferrífero, Minas Gerais, Brazil.". Wahrscheinlichkeits- und Ausgleichungsrechnung by Herz, N and a great selection of related books, art and collectibles available now at ABSTRACT: A study of geology and rocks paragenesis has been con- ducted at the Córrego do Sítio auriferous lineament, containing the Ca- chorro Bravo, Laranjeiras and Carvoaria metaturbidite-hosted lode-gold deposits located in the Quadrilátero Ferrífero Region, Minas Gerais, Bra- zil.

These representative deposits are described to illustrate the essentially. The rocks crop out in the Bação complex, which is the gneissic basement of the Rio das Velhas greenstone belt in the central portion of the Quadrilátero Ferrífero (QF).

The interest in a petrogenetic study of the ultramafic rocks is the partial preservation of igneous minerals, which are not observed in most of the completely metamorphosed.

Brazil is the world's largest iron ore exporter with an annual production of over Mt, of which over 70% is exported. The majority of this comes from two regions, the Serra dos Carajás in Para State in the north, and the Quadrilatero Ferrifero further south in Minas Gerais State.

Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth s rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary. Igneous rocks are formed from the solidification of magma, which is a hot ( to 1, °C, or 1, to 2, °F) molten or partially molten rock.

The Sanaga prospect in the north of Edea is located in the upper Nyong unit of the Ntem complex in Cameroon. The objective of this study is to use geochemical data trends for major and some trace elements to constrain the origin and/or sources of various constituents in the iron-bearing units as well as assess their economic potentials.

The rock samples were collected from a. APPLICATION DOSSIER OF THE QUADRILATERO FERRIFERO GEOPARK TO THE GLOBAL UNESCO NETWORK OF GEOPARKS Minas Gerais, Brazil: evidence for Paleoproterozoic collision and collapse in the. the central-eastern part of the state of Minas Gerais and is comprised mainly of an undivided assemblage of TTG (tonalitee-trondhjemiteegranodiorite) gneisses, migmatites and granitic bodies, commonly displaying mylonitic fabric, together with discontinuous strings of metasedimentary and metavolcanic rocks (Dussin et al., ; Noce et al., ).

Cabral A R, Rocha Filho O G, Jones R D - Hydrothermal origin of soft hematite ore in the Quadrilatero Ferrifero of Minas Gerais, Brazil: petrographic evidence from the Gongo Soco iron ore deposit; in Trans. IMM (incorp.

AusIMM Proc.), Section B, Appl. Earth Sc. v pp Gneissic and igneous rocks of the Quadrilátero Ferrífero, Minas Gerais, Brazil. U.S. Geological Survey Professional Paper, B LEAKE, B.E.

Granite magmas: their sources, initiation and conse- quences of emplacement. Journal of. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.

These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page. CiteScore: ℹ CiteScore: CiteScore measures the average citations received per peer-reviewed document published in this title.

CiteScore values are based on citation counts in a range of four years (e.g. ) to peer-reviewed documents (articles, reviews, conference papers, data papers and book chapters) published in the same four calendar years, divided by.

Gneissic and igneous rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil,Professional Paper B Larger foraminifera of late Eocene age from Eua, Tonga,Professional Paper B Upper Paleozoic rocks in the Oquirrh Mountains and Bingham mining district, Utah, with a section on biostratigraphy and correlation,   Igneous rocks are classified by the minerals they contain.

The main minerals in igneous rocks are hard, primary ones: feldspar, quartz, amphiboles, and pyroxenes (together called "dark minerals" by geologists), as well as olivine, along with the softer mineral mica. The two best-known igneous rock types are basalt and granite, which have.

Trap Rock is a name applied to any dark-colored igneous rock used to produce crushed stone. Difficult Rocks. Difficult Rocks Elementary students find lots of rocks that you will not be able to identify.

Sliding Rocks. Sliding Rocks on Racetrack Playa How they slide across a. Minas Gerais Brazil Quadrilatero Ferrifero (1) United States Ohio (1) Pennsylvania Allegheny County Pennsylvania (1) igneous rocks carbonatites (1) metamorphic rocks metamorphic rocks.

Minas Gerais Brazil Quadrilatero Ferrifero (1) Rio Grande do Norte Brazil (1) United States Alaska Prudhoe Bay igneous rocks kimberlite (2) plutonic rocks.

Felsic rocks Rocks composed mostly of biotite, muscovite, sodium-rich plagioclase feldspars, potassium feldspars, and quartz make up the felsic family of igneous rocks. Felsic magmas are much more viscous than the intermediate magmas. Additionally, felsic magmas may have very high gas contents.

CARBON STABLE ISOTOPES OF CARBONACEOUS ROCKS FROM THE IRON QUADRANGLE, MINAS GERAIS STATE. Keywords: Carbon isotopes, graphite schists, Quadrilátero Ferrifero. Brazil. ABSTRACT. We present and discuss the petrography and carbon stable isotope data on carbonaceous materials from tertiary and precambrian rocks from the.

m oz of gold have been produced, sincefrom late Archaean ( Ma) greenstone belts of the Central Plateau, Tanzania. North and east of Nzega (4/sup 0/12'S, 3/sup 0/11'E), 18% of the exposed basement, mainly Dodoman schists and granites, consists of metavolcanics and metasediments of the Nyanzian and Kavirondian Series.

Angular unconformity is consisted of tilted or folded sedimentary rocks that are overlain by younger, more flat-lying strata. Disconformity is the strata on either side are essentially parallel.

Nonconformity is the break that separates older metamorphic or intrusive igneous rocks from younger sedimentary strata. Igneous rock - Igneous rock - Convergent plate boundaries: Igneous rocks associated with convergent plate boundaries have the greatest diversity.

In this case, granite batholiths underlie the great composite volcanoes and consist of rocks ranging from basalt through andesite to dacite and rhyolite. These boundaries are destructive and consume the subducting oceanic. BRAZIL bi " 4. 4. ãos.u bi coc rs lia. Brumål 19 4RB Qu te '30" 37'30" Rio ¥ +11k + u Gneissic and igneous rocks MINAS GERAIS, MAP VARIATIONS, SCALE DATUM IS MEAN SEA LEVEL QUADRILÁTERO BRAZIL The São Francisco Craton is situated in the central-eastern part of Brazil (Bahia state and Minas Gerais state; Fig.

3) and represents one of the major shield areas in South. (Minas Gerais state). In the central part of the craton The gneissic rocks and supracrustal sequences of the province were reworked and. Read "/res" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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