Pub Date : 2018-07-04DOI: 10.21715/GB2358-2812.2018321062
Said Abdallah
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.
{"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}
Pub Date : 2018-07-04DOI: 10.21715/gb2358-2812.2018321040
Heloiza Márcia Fernandes-Horn, A. Horn, R. A. Sampaio, M. Rodrigues, L. Duarte, E. Bilal, Hernando Baggio Filho, I. Torres
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.
本工作的靶区为金矿和铅矿复合体周围的重金属异常区。本文研究了土壤样品和植物硅基植物岩中部分重元素的分布。目的是验证金属含量是否表明土壤中的金属异常。植物和土壤样本是在花岗岩-片麻岩剖面上收集的，这些花岗岩-片麻岩构成了基底，与属于Riacho dos Machados群的上覆沉积单元(属于espinhaaco超级群的一部分)有构造接触。整个岩石基底覆盖着不同暴露深度的红土-砂质土。富金属流体侵入这些单元，在Salobre-Porteirinha等锌铅金矿床中形成金属异常。样品经适当制备后，采用ICP-OES(硅-植物岩)和FRX(土壤)分析。所研究剖面的异常表现为所选物种硅植物岩中金属含量高。用不同的种类测定不同深度的金属浓度，方法简单易行。硅-植物岩浓度似乎比土壤样品更能再现岩石金属异常。
{"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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