Show more. Apr Calculated Hf isotope model ages are in the range ca 2. A clear understanding of the provenance of late Cenozoic Chinese loess and the underlying Red Clay deposits will shed light on the history and mechanisms of Asian aridification. There are also post-ore syenogranite porphyries in the deposit area. Mary L. Provenance of middle to late Palaeozoic sediments in the northeastern Colombian Andes:
The lack of 1.
U-Pb dating of zircon by LA-ICP-MS
Our study indicates that the north Indian continental margin was indeed an active subduction zone during the formation of Columbia. The proposed technique consists of Pb, U isotopic composition analysis and the sbusequent data processing procedure. This technique is especially well suited to reconnaissance geochronologic and detrital zircon studies. This compositional record suggests an arc maturity trend in which partial melting of basaltic and perido-titic sources becomes more significant than radio genic subducted sediments or the ancient continental crust. Geological and reservoir quality implications.
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