【摘 要】
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This article examined the use of the ~(40)Ar/~(39)Ar incremental heating and K/Ar analyses to date dolerites located in the extreme north region in Brazil. The
【机 构】
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The University of Queensland,University of Sao Paulo,
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This article examined the use of the ~(40)Ar/~(39)Ar incremental heating and K/Ar analyses to date dolerites located in the extreme north region in Brazil. The material used for dating was whole rock and separated minerals(plagioclases,pyroxene or/and amphibole)in 6 samples of dykes and sills from Roraima.The dolerites yield plateau ages ranging from 1955±17 Ma to 1179±10 Ma.The reason to
This article examined the use of the ~ (40) Ar / ~ (39) Ar incremental heating and K / Ar analyzes to date dolerites located in the extreme north region in Brazil. The material used for dating was whole rock and separated minerals (plagioclases , pyroxene or / and amphibole) in 6 samples of dykes and sills from Roraima. The dolerites yield plateau ages ranging from 1955 ± 17 Ma to 1179 ± 10 Ma. The reason to
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