Title: Zircon U-Pb ages,Hf isotopic characteristics and their implications of the Early Paleozoic granites in the northeastern Da Hinggan Mts.,northeastern China
Abstract:The Paleozoic granites in the Ergun block,exposed in the northeastern Da Hinggan Mts.,northeastern China,are of I- type.Zircon U-Pb dating by LA-ICPMS technique indicates that the Shibazhan,Neihe and ...The Paleozoic granites in the Ergun block,exposed in the northeastern Da Hinggan Mts.,northeastern China,are of I- type.Zircon U-Pb dating by LA-ICPMS technique indicates that the Shibazhan,Neihe and Baiyinna plutons were emplaced with ages of 499±1,500±1 and 460±1Ma;whereas the Chalabanhe pluton was formed by several pulses with age between 465~481Ma. Considering other previously reported age data,it is proposed that the granitic magmatism in the northeastern Da Hinggan Mts.during the Early Paleozoic took place at 460~500Ma.Zircon Hf analyses conducted by LA-MC-ICPMS show that these granites havee_(Hf)(t) values of +1.5~+3.8 with Hf modal ages of 1.1~1.4Ga,indicating that the crust in the Ergun block was extracted from mantle during Meso-Neoproterozoic,which is much different from the Xing'an block to the south,in that it shows a characterized Phanerozoic crustal age.Read More
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 98
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