{"title":"Estudo litogeoquímico dos granitóides do norte do Mato Grosso (Brasil), litogênese do sistema plutônico granítico pós-colisional a intraplaca na porção sul do cráton amazônico","authors":"Said Abdallah","doi":"10.21715/GB2358-2812.2018321062","DOIUrl":"https://doi.org/10.21715/GB2358-2812.2018321062","url":null,"abstract":"Atraves do estudo de litogeoquimica dos granitos localizados no norte do Mato Grosso (Brasil) permitiu identificar caracteristicas geoquimicas, em relacao aos elementos menores e maiores, de series magmaticas calcio-alcalina alto K, semelhantes aos granitos tipo A2, possivelmente com origem mantelica contaminado por elementos crustais. A assinatura geoquimica assemelha-se aos granitos de sistemas Pos-colisionais a Pos-orogenicos, alguns tendendo para caracteristicas geoquimicas de ambiente de sistemas Intraplaca a Anorogenicos. As idades geocronologicas U-Pb situam-se entre o Orosiriano (Paleoproterozoico) ate o Calimiano (Mesoproterozoico) e em funcao da distribuicao multielementar e o padrao de elementos terras raras, aplicando-se varios modelos discriminantes, estes apresentam uma mesma origem ou fonte primordial para estas granitogeneses.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44005026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Heloiza Márcia Fernandes-Horn, A. Horn, R. A. Sampaio, M. Rodrigues, L. Duarte, E. Bilal, Hernando Baggio Filho, I. Torres
{"title":"Metal Anomaly Prospection at Cerrado. Example for the use of Si-Phytoliths as anomaly indicators at Riacho dos Machado Region, Minas Gerais, Brazil","authors":"Heloiza Márcia Fernandes-Horn, A. Horn, R. A. Sampaio, M. Rodrigues, L. Duarte, E. Bilal, Hernando Baggio Filho, I. Torres","doi":"10.21715/gb2358-2812.2018321040","DOIUrl":"https://doi.org/10.21715/gb2358-2812.2018321040","url":null,"abstract":"The target area of this work is a heavy metal anomaly in the surroundings of a gold mine and a lead mining complex. This work investigated the distribution of selected heavy elements in soil samples and Si-Phytoliths from plants. The aim was to verify if metal contents are indicative for metal anomalies in the soil. Plants and soil samples were collected in profiles over granitic-gneissic rocks, which form the basement, in tectonized contact with the overlaying sedimentary units belonging to the Riacho dos Machados Group, part of the Espinhaco Super Group. The whole rock substrate is covered by lateritic to arenitic soils with different exposure depths. Metal-rich fluid invaded these units, forming metal anomalies culming in Zn-Pb-Au deposits, like that of Salobre-Porteirinha. After appropriate preparation, the samples were, analyzed by ICP-OES (Si-Phytoliths) and FRX (soil). Anomalies in the investigated profile are indicated by high metal contents in the Si-Phytoliths of the selected species. Using different species the metal concentration in different depths can be determined in a simple and easy way. The Si-Phytolith concentrations seem to reproduce better the rock metal anomalies than the soil samples.","PeriodicalId":34597,"journal":{"name":"Geochimica Brasiliensis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46529778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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