Geological Setting And Geochemistry Of The Plutonic-volcanic Units From The União Do Norte Region, Eastern Portion Of The Alta Floresta Gold Province (mt) [contexto Geológico E Litogeoquímica Das Unidades Plutônicas-vulcânicas Da Região De União Do Norte, Setor Leste Da Província Aurífera De Alta Floresta (mt)]

dc.creatorDe Assis R.R.
dc.creatorXavier R.P.
dc.creatorDe Barros A.J.P.
dc.creatorBarbuena D.
dc.creatorJunior E.M.
dc.date2012
dc.date2015-06-26T20:29:45Z
dc.date2015-11-26T14:26:29Z
dc.date2015-06-26T20:29:45Z
dc.date2015-11-26T14:26:29Z
dc.date.accessioned2018-03-28T21:29:33Z
dc.date.available2018-03-28T21:29:33Z
dc.identifier
dc.identifierRevista Brasileira De Geociencias. , v. 42, n. 1, p. 130 - 161, 2012.
dc.identifier3757536
dc.identifier
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84863732890&partnerID=40&md5=e5055cd1dde0980914a9b3a356889779
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/97152
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/97152
dc.identifier2-s2.0-84863732890
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1246095
dc.descriptionThe Alta Floresta Gold Province, eastern portion of the Amazon Craton, represents a tectonic unit composed primarily of plutonic-volcanic sequences generated in a continental arc during the Paleoproterozoic. Particularly in the União do Norte region, easternmost segment of this province and within the municipal limits of Peixoto de Azevedo (MT), the plutonic and volcanic rocks are the host of gold deposits with base metal sulphides (sphalerite+galena±chalcopyrite±digenite), some currently under exploitation by local prospectors (garimpeiros). The geological setting of this region consists essentially of an epiclastic volcaniclastic unit and granitic suites. The former unit contains feldspathic-arenite and feldspathic-wake volcaniclastics interpreted to have been deposited in a retroarc foreland basin in an active continental margin. The main source area for these sediments would have been intermediate volcanic rocks. The granitoids show composition ranging from granodiorite to alkali-feldspar porphyritic granite (União do Norte Porphyry). Mafic to felsic volcanic dikes crosscut both the volcaniclastic unit as the granitoids, which are still overlain by arenaceous sediments of the Dardanelos Formation. The plutonic and volcanic units represent essentially a high-K calc-alkaline, magnesium to ferrous, metaluminous to subordinate alkaline and peraluminous magmatism. Additionally, field and geochemical data also indicate that the granitic suites represent a magmatic series that probably evolved from granodiorites (I-type granite) generated in the onset of a volcanic arc to the emplacement of highly-evolved granitic rocks, such as the União do Norte Porphyry (A-type granite), in a post-collisional setting.
dc.description42
dc.description1
dc.description130
dc.description161
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dc.languagept
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dc.relationRevista Brasileira de Geociencias
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dc.sourceScopus
dc.titleGeological Setting And Geochemistry Of The Plutonic-volcanic Units From The União Do Norte Region, Eastern Portion Of The Alta Floresta Gold Province (mt) [contexto Geológico E Litogeoquímica Das Unidades Plutônicas-vulcânicas Da Região De União Do Norte, Setor Leste Da Província Aurífera De Alta Floresta (mt)]
dc.typeArtículos de revistas


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