Alexandre Raphael Cabral , Tiago Henrique DeFerreira , Giulia Marina Cerqueira Dias , Jefferson Ferreira da Silva , Fernando Brant Drumond Soares , Francisco Javier Rios
{"title":"The use of mercury vs. cerium in recognising seismically induced fluid overprints on weathered profiles","authors":"Alexandre Raphael Cabral , Tiago Henrique DeFerreira , Giulia Marina Cerqueira Dias , Jefferson Ferreira da Silva , Fernando Brant Drumond Soares , Francisco Javier Rios","doi":"10.1016/j.ringeo.2020.100006","DOIUrl":null,"url":null,"abstract":"<div><p>Reconnaissance whole-rock chemical analyses for Hg and Ce in weathered Mn-oxide-rich rocks from the Quadrilátero Ferrífero, Minas Gerais, Brazil, show a positive linear correlation. In contrast, manganiferous duricrusts from lateritic profiles in south-western Amazonia, Brazil, have no Hg–Ce correlation. Considering the presence fault-related rock fabrics in the former, such as slickenside striae, breccias and veinlets, and the Hg sensitivity to seismic activity, as well as the adsorption of aqueous Ce onto Mn-oxide precipitates, it is proposed that the positive Hg–Ce correlation can be used as an indicator of seismically induced, low-temperature hydrothermal fluid flow in the weathering zone.</p></div>","PeriodicalId":101085,"journal":{"name":"Results in Geochemistry","volume":"1 ","pages":"Article 100006"},"PeriodicalIF":0.0000,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.ringeo.2020.100006","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Results in Geochemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S266627792030006X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
Reconnaissance whole-rock chemical analyses for Hg and Ce in weathered Mn-oxide-rich rocks from the Quadrilátero Ferrífero, Minas Gerais, Brazil, show a positive linear correlation. In contrast, manganiferous duricrusts from lateritic profiles in south-western Amazonia, Brazil, have no Hg–Ce correlation. Considering the presence fault-related rock fabrics in the former, such as slickenside striae, breccias and veinlets, and the Hg sensitivity to seismic activity, as well as the adsorption of aqueous Ce onto Mn-oxide precipitates, it is proposed that the positive Hg–Ce correlation can be used as an indicator of seismically induced, low-temperature hydrothermal fluid flow in the weathering zone.
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