威海地区超高压变质花岗片麻岩锆石U-Pb定年和氧同位素研究

唐俊; 郑永飞; 吴元保; 龚冰

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 692-706

TANG Jun, ZHENG Yong-fei, WU Yuan-bao, GONG Bing, 2005. A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu. Earth Science, 30(6): 692-706.

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TANG Jun, ZHENG Yong-fei, WU Yuan-bao, GONG Bing, 2005. A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu. Earth Science, 30(6): 692-706.

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A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu

CAS Key Laboratory of Crust-Mantle Materials and Environments．School of Earth and Space Sciences．University of Science and Technology of China，Hefei 230026，China

Received Date: 2005-07-21
Publish Date: 2005-11-25

Abstract

Abstract

Extremely ¹⁸O-depleted zircons from granitic gneisses, with δ¹⁸O values as low as -7.8‰, were found in the Zaobuzhen area in the Weihai region, at the northeastern end of the Sulu orogen. SHRIMP zircon U-Pb ages and the oxygen isotope compositions were determined for the Low-δ¹⁸O zircons. CL images reveal that the Low-δ¹⁸O zircons are primarily of igneous origin, but some grains underwent metamorphic recrystallization. The igneous zircons from a granitic gneiss sample yield a concordant U-Pb age of (760±49) Ma and an upper intercepted age of (751±27) Ma, indicating a protolith of Middle Neoproterozoic age. Metamorphic zircons from the same sample yield a concordant U-Pb age of (232±4) Ma and a lower intercepted age of (241±33) Ma, pointing to Triassic UHP metamorphism. Most of the igneous zircons have unusually variable δ¹⁸O values of -7.76‰ to 5.40‰, indicating that the gneiss protolith was intruded as Low-δ¹⁸O magma that was generated by the partial melting of altered rocks, which suffered intensive water-rock interaction with a Low-δ¹⁸O fluid at high temperatures during the Neoproterozoic. The preservation of extreme ¹⁸O-depletion in the zircons suggests that there is no remarkable oxygen isotope exchange between the metagranite and the mantle during the processes of Triassic subduction and exhumation. The protolith nature, metamorphic timing and oxygen isotope compositions of the granitic gneisses in the Weihai region are similar to those of granitic gneisses in the Qinglongshan area in the southwestern part of the Sulu orogenic belt, indicating that the gneisses along the Sulu orogenic belt share the same nature of protolith origin, water-rock interaction and UHP metamorphism. The present study provides tight constraints not only on the origin of extremely ¹⁸O-depleted zircons, but also on the protolith nature of granitic gneisses in the Sulu orogenic belt.
- Sulu orogen,
- UHP metamorphic rocks,
- zircon U-Pb dating,
- oxygen isotope,
- protolith nature

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References(86)

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A Study of Zircon U-Pb Dating and Oxygen Isotopes in UHP Granitic Gneiss from the Weihai Region in Northeast Sulu

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