کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6442137 1639594 2016 74 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Unravelling the record of Archaean crustal evolution of the Bundelkhand Craton, northern India using U-Pb zircon-monazite ages, Lu-Hf isotope systematics, and whole-rock geochemistry of granitoids
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Unravelling the record of Archaean crustal evolution of the Bundelkhand Craton, northern India using U-Pb zircon-monazite ages, Lu-Hf isotope systematics, and whole-rock geochemistry of granitoids
چکیده انگلیسی
Hf-isotope and whole-rock geochemical data of the TTGs suggest a complex process of crust formation and stabilisation during the Palaeoarchaean, mainly by the reworking of older mafic and felsic crust between 3.55 and 3.20 Ga. The CHUR parallel array for the TTGs may indicate that these rocks were formed by partial melting of an oceanic crust that was derived from chondritic mantle sources, shortly before formation of TTG. This interpretation is inconsistent with Hf-isotope data from worldwide sources, which provide evidence for a successive mantle depletion since at least 4.0 Ga, resulting in εHft of about +5.0 at 3.0 Ga. Intense melting of the heterogeneous TTG crust during the Neoarchaean resulted in the coeval formation of granodioritic gneisses and voluminous granites, and subordinate hybrid granites with a minor contribution of melts from an enriched mantle source, affected by subduction-zone processes prior to 2.55 Ga.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 281, August 2016, Pages 384-413
نویسندگان
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