Early Paleozoic ridge subduction in the Chinese Altai: Insight from the abrupt change in zircon Hf isotopic compositions

• Published in: Science China. Earth sciences Vol. 52; no. 9; pp. 1345 - 1358
• Main Authors: Sun, Min, Long, XiaoPing, Cai, KeDa, Jiang, YingDe, Wang, BuYun, Yuan, Chao, Zhao, GuoChun, Xiao, WenJiao, Wu, FuYuan
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science in China Press 01.09.2009; Springer Nature B.V
• Subjects: Altai; Basalt; Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; granite; isotope; Lithosphere; Magma; Metamorphism; Paleozoic; ridge; Sedimentary rocks; Seismology; subduction; Paleozoic; ridge subduction; Hf isotope; granite; Altai

Zircons were separated from granitoids, gneisses, and sedimentary rocks of the Chinese Altai. Those with igneous characteristics yielded U-Pb ages of 280-2800 Ma, recording a long history of magmatic activity in the region. Zircon Hf isotopic compositions show an abrupt change at ~420 Ma, indicating...