桐柏-大别造山带高压变质单元岩石Pb同位素组成

张利; 钟增球; 张宏飞; 王林森

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 729-737

ZHANG Li, ZHONG Zeng-qiu, ZHANG Hong-fei, WANG Lin-sen, 2005. Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt. Earth Science, 30(6): 729-737.

Citation:

ZHANG Li, ZHONG Zeng-qiu, ZHANG Hong-fei, WANG Lin-sen, 2005. Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt. Earth Science, 30(6): 729-737.

ZHANG Li, ZHONG Zeng-qiu, ZHANG Hong-fei, WANG Lin-sen, 2005. Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt. Earth Science, 30(6): 729-737.

Citation:

ZHANG Li, ZHONG Zeng-qiu, ZHANG Hong-fei, WANG Lin-sen, 2005. Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt. Earth Science, 30(6): 729-737.

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Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt

ZHANG Li^{1, 2
,},
ZHONG Zeng-qiu^{1, 2},
ZHANG Hong-fei^{1, 2},
WANG Lin-sen^{1, 2}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Publish Date: 2005-11-25

Abstract

Abstract

Pb isotope compositions play an important role in tectonic division and evolution, block interaction and identifying different block relations in the crust. Our study shows that Pb isotope compositions of the high-pressure (HP) metamorphic rocks in different parts of Tongbai-Dabie orogenic belt, consisting of two-mica albite gneisses and eclogites, are similar and characterized by upper crustal Pb isotope compositions. They have ²⁰⁶pb/²⁰⁴Pb= 17. 599 - 18. 310, ²⁰⁷pb/²⁰⁴Pb= 15. 318 - 15. 615, ²⁰⁸pb/²⁰⁴Pb=37. 968 - 39. 143. The Pb isotope compositions of the HP metamorphic rocks both in Tongbai and Dahie areas are consistent. It is suggested that the HP metamorphic rocks both in Tongbai and Dabie areas belong to the same lithotectonic unit. In general, the Pb isotope compositions of the HP metamorphic rocks are higher than those of the ultrahigh pressure (UHP) metamorphic rocks. It is evident that the Pb isotope compositions of the rocks from the subducted Yangtze continental crust in Tongbai-Dabie orogenic belt show a regular variation from lower crust to upper crust, from lower radiogenic abundances in the lower crust to higher abundances in the upper crust. The foliated garnet-bearing granites, in-truded into the HP metamorphic rocks in different parts of the orogenic belt have similar Pb isotope compositions. They have ²⁰⁶pb/²⁰⁴Pb= 17. 128 - 17. 434, ²⁰⁷pb/²⁰⁴Pb= 15. 313 - 15. 422 and ²⁰⁸pb/²⁰⁴Pb= 37. 631 - 38. 122, which are obviously different from the compositions of the HP metamorphic rocks but similar to those of the UHP metamorphic rocks and the foliated garnet-bearing granites in the UHP metamorphic rocks. This shows that the granites both in the HP and UHP metamorphic rocks have a common magma source. The foliated garnet-bearing granites have the geochemical characteristics of A-type granites, suggesting that the magma of these granites in the UHP and HP metamorphic rocks were derived from the partial melting of the retro-metamorphosed UHP metamorphic rocks exhumed into the middle to lower crust.
- Pb isotope compositions,
- foliated garnet-bearing granites,
- high-pressure metamorphic rocks,
- Tongbai-Dabie orogenic belt

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Pb Isotope Compositions of Metamorphic Rocks from High-Pressure Unit in Tongbai-Dabie Orogenic Belt

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