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Volume 16 Issue 2
Jun.  2005
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Chen Yuelong, Luo Zhaohua. Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution. Journal of Earth Science, 2005, 16(2).
Citation: Chen Yuelong, Luo Zhaohua. Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution. Journal of Earth Science, 2005, 16(2).

Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution

  • Received Date: 2018-07-16
  • Rev Recd Date: 2018-07-16
  • Publish Date: 2018-07-16
  • Neodymium (Nd) depleted mantle model ages indicate that the Kangding complexes in the northern segment of the western Yangtze craton, argued as representative of the craton’s basement, actually formed after 1.6 Ga. An SmNd isochron of 706 Ma constrains the upper limit formation of the complex from Shaba, Sichuan Province. Lead (Pb) isotopic compositions imply that the southern and northern basements of the western Yangtze craton can not be correlated. The southern basement is characterized by higher 206 Pb/ 204 Pb ratios (≥17.69) than the northern ones (<17.69). However, Hercynian granitoids, gabbros as well as the Permian basalts in the northern segment show no difference from the southern segment in Pb isotopic compositions. This suggests that the southern and northern segments were controlled by one common mantle domain during the Late Paleozoic. Based on Nd model ages of sediments and metasediments, as well as the ages of their relict zircons, we infer that the Yangtze craton is
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Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution

Abstract: Neodymium (Nd) depleted mantle model ages indicate that the Kangding complexes in the northern segment of the western Yangtze craton, argued as representative of the craton’s basement, actually formed after 1.6 Ga. An SmNd isochron of 706 Ma constrains the upper limit formation of the complex from Shaba, Sichuan Province. Lead (Pb) isotopic compositions imply that the southern and northern basements of the western Yangtze craton can not be correlated. The southern basement is characterized by higher 206 Pb/ 204 Pb ratios (≥17.69) than the northern ones (<17.69). However, Hercynian granitoids, gabbros as well as the Permian basalts in the northern segment show no difference from the southern segment in Pb isotopic compositions. This suggests that the southern and northern segments were controlled by one common mantle domain during the Late Paleozoic. Based on Nd model ages of sediments and metasediments, as well as the ages of their relict zircons, we infer that the Yangtze craton is

Chen Yuelong, Luo Zhaohua. Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution. Journal of Earth Science, 2005, 16(2).
Citation: Chen Yuelong, Luo Zhaohua. Nd-Pb Isotopes of Basement Rocks, Granitoids and Basalts from the Western Margin of the Yangtze Craton: Implications for Crustal Evolution. Journal of Earth Science, 2005, 16(2).

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