扬子克拉通南华纪碎屑锆石U-Pb年龄、Hf同位素对华南新元古代岩浆事件的指示

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Volume 34 Issue 1

Jan. 2009

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Article Navigation > Earth Science > 2009 > 34(1): 117-126

XIE Shi-wen, GAO Shan, LIU Xiao-ming, GAO Ri-sheng, 2009. U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China. Earth Science, 34(1): 117-126.

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U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China

XIE Shi-wen^{1, 2
,},
GAO Shan^{1, 2, 3},
LIU Xiao-ming³,
GAO Ri-sheng⁴

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
4.
CNPC International Research Center, Beijing 100083, China

Received Date: 2008-10-10
Publish Date: 2009-01-25

Abstract

Abstract

This paper reports LA-ICP-MS U-Pb dates of detrital zircons from the Nanhua clastic sedimentary rocks in the Yangtze gorges. Neoproterozoie U-Pb ages show two peaks at 833 Ma and 785 Ma,assumably corresponding to two large-scale periods of magmatism.ε_Hf(t) values for the 910-890Ma zircons are positive (≈10,similar to the value of the coeval depleted mantle),while those for the 890-840Ma zircons tend to decrease to negative values,and there shows age peaks at 890Ma. These data allow us to infer that transformation of oceanic subduction into continental collision or continental-arc collision occurred at about 890 Ma via amalgamation of the Yangtze and Cathaysia blocks. The high ε_Hf(t) values prior to 890 Ma resulted from the subduction of oceanic crust. The subsequent drop of ε_Hf(t) values was caused by the crust melting and crustal collision. ε_Hf(t) values for the 840-800Ma zircons are either negative or positive,whereas ε_Hf(t) values for the 800-780Ma zircons are all negative and ε_Hf(t) values for the 780-750Ma zircons are mostly positive. These data are in coincidence with two stages of the mantle plume beneath the Yangtze craton at 830-795Ma and 780-745Ma.
- Yangtze block,
- zircon U-Pb dating,
- mantle plume,
- Rodinia supercontinent,
- Hf isotope

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References(48)

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U-Pb Ages and Hf Isotopes of Detrital Zircons of Nanhua Sedimentary Rocks from the Yangtze Gorges: Implications for Genesis of Neoproterozoic Magmatism in South China

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