کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9533808 | 1639751 | 2005 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Provenance record of the Jack Hills metasedimentary belt: Source of the Earth's oldest zircons
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
Detrital SHRIMP U-Pb results from four samples of metasediment show that the Jack Hills metasedimentary belt, Narryer terrane, Yilgarn craton, Western Australia contains two lithologically similar siliciclastic associations with discrete age and source characteristics. An older association only contains zircons with ages greater than 3000Â Ma and probably accumulated prior to 2700Â Ma. Grains in the range 3600-3000Â Ma are likely derived from granitic gneisses surrounding the metasedimentary belt. The older association was in part sourced from, and likely accumulated on, gneisses of the Narryer terrane, however, the source of the oldest (>4000Â Ma) grains is unknown. The younger association contains zircons with the bulk of the ages between 2800 and 2600Â Ma, and detrital grains as young as 1800Â Ma. It also shows ages in the range 3600-3000Â Ma and a few grains as old as 4100Â Ma. The younger association has a significant contribution of zircons derived from Yilgarn craton and Capricorn orogen and was deposited after â¼1800Â Ma, possibly in a foreland basin setting close to the older association with the two then tectonically interleaved.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 138, Issues 3â4, 9 August 2005, Pages 235-254
Journal: Precambrian Research - Volume 138, Issues 3â4, 9 August 2005, Pages 235-254
نویسندگان
Stuart J. Dunn, Alexander A. Nemchin, Peter A. Cawood, Robert T. Pidgeon,