Dating the Itabira iron formation, Quadrilátero Ferrífero of Minas Gerais, Brazil, at 2.65 Ga: Depositional U–Pb age of zircon from a metavolcanic layer
Dating the Itabira iron formation, Quadrilátero Ferrífero of Minas Gerais, Brazil, at 2.65 Ga: Depositional U–Pb age of zircon from a metavolcanic layer
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巴西米纳斯吉拉斯州 Quadrilátero Ferráfero 伊塔比拉铁矿层年龄 2 65 Ga:变火山层锆石沉积 UâPb 年龄
DOI:
10.1016/j.precamres.2012.02.006
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发表时间:
2012
影响因子:
3.8
通讯作者:
Lehmann
中科院分区:
文献类型:
--
作者:
Cabral;Koglin;Seabra Gomes Jr;Lehmann
Uranium–Pb dating of zircon from a metavolcanic layer within the Itabira iron formation, or Cauê Itabirite, Quadrilátero Ferrífero of Minas Gerais, Brazil, indicates that its deposition occurred at 2.65Ga, i.e., considerably earlier than proposed by previous geochronological studies, which suggested deposition between 2.58Ga (detrital zircon age from the underlying Moeda Formation) and 2.42Ga (Pb–Pb isochron age from dolomitic rocks of the immediately overlying Gandarela Formation). The new age has major implications for the geology of the Quadrilátero Ferrífero and connects it with the Neoarchaean iron formation of the Carajás mineral province.
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