کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4723567 1639658 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
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
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
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
چکیده انگلیسی

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 2.65 Ga, i.e., considerably earlier than proposed by previous geochronological studies, which suggested deposition between 2.58 Ga (detrital zircon age from the underlying Moeda Formation) and 2.42 Ga (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.


► First U–Pb zircon age for a metavolcanic layer within the Itabira iron formation, or Cauê Itabirite, of Minas Gerais, Brazil.
► The new zircon age indicates that the deposition of the Itabira iron formation occurred at 2.65 Ga.
► The new age is considerably older than proposed by previous geochronological studies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volumes 204–205, May 2012, Pages 40–45
نویسندگان
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