Redalyc.The Gemstone Deposits of Brazil: Occurrences, Production And

Boletín de la Sociedad Geológica Mexicana ISSN: 1405-3322 [email protected] Sociedad Geológica Mexicana, A.C. México

de Brito Barreto, Sandra; Bretas Bittar, Sheila Maria The gemstone deposits of Brazil: occurrences, production and economic impact Boletín de la Sociedad Geológica Mexicana, vol. 62, núm. 1, 2010, pp. 123-140 Sociedad Geológica Mexicana, A.C. Distrito Federal, México

Available in: http://www.redalyc.org/articulo.oa?id=94315961008

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20° 44° 19°52'33" Belo Horizonte Rio Piracicaba 44°30' 20°

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Ocurrence area of Itabirito Imperial Topaz

Mariana 0 10 20Km Ouro Preto

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40º32’30’’

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10º40’00’ Recent detritic sediments

Granite bodies (C-Carnaíba,

oterozoic A- Angico, M-Miranga) Quartzites from the Rio do Ouro PaleoPr Formation(Jacobina Group )

Itapicuru complex: phyllites, schists, chlorite schists and quartzites

rozoic

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Archean/ Munde Carnaíba PaleoPr Gneisses and Migmatites de Cima

Carnaíba Contact de Baixo Formiga Fault or Fracture Bráulia Thrust fault

Attitude of layer and foliation Marota Emerald prospects

Emerald Mine

Legal Prospecting Reserve

Road Laranjeiras Mine

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0 1 23 4Km

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40º 15’ 40”

Alluvium N

Colluvium Garimpo Socotó

Granite, adamelite and granodiorite 10º 18’ 43” (Campo Formoso Batholith) Gangorra Farm

Metabasite, metaultrabasite and amphibolite

Metasediment s of the Itapicuru Complex: quartzite, metasiltite and phyllite Riacho Farm

Quartz vein and/or pegmatite

Emerald Prospecting Area «Garimpo Socotó»

Farm Fault and fracture Boca da Mata Farm

Road River

0 1000 2000Km Sacaíba Farm

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Calcedony Amethyst São Raimundo Rose Quartz Rock Crystal Nonato Bom Jesus Bahia Tourmaline  Open-cast diamond prospecting  Area highly favorable for gems Gilbeús Area favorable for gems Corrente 0Km 100Km 200Km Area not very favorable for gems

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60

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