松潘造山带马尔康强过铝质花岗岩的成因及其构造意义

时章亮; 张宏飞; 蔡宏明

Volume 34 Issue 4

Jul. 2009

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SHI Zhang-liang, ZHANG Hong-fei, CAI Hong-ming, 2009. Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication. Earth Science, 34(4): 569-584.

Citation:

SHI Zhang-liang, ZHANG Hong-fei, CAI Hong-ming, 2009. Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication. Earth Science, 34(4): 569-584.

SHI Zhang-liang, ZHANG Hong-fei, CAI Hong-ming, 2009. Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication. Earth Science, 34(4): 569-584.

Citation:

SHI Zhang-liang, ZHANG Hong-fei, CAI Hong-ming, 2009. Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication. Earth Science, 34(4): 569-584.

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Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication

SHI Zhang-liang^{1, 2},
ZHANG Hong-fei^{1, 2
,
,},
CAI Hong-ming^{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

Received Date: 2009-01-16
Publish Date: 2009-07-25

Abstract

Abstract

In the Songpan fold belt, Indosinian post-collision granitoids, including adakitic, A-type and I-type granitoids, are widespread.However, studies on Indosinian strongly peraluminous granite in this area are rare.The Markan granites, including medium-grained two-mica granite and medium-fine grained two-mica granite, are strongly peraluminous granites with Al index (A/CNK) =1.10-1.20.By using LA-ICP-MS zircon dating method, magma crystallization ages 208±2 Ma for the medium-grained two-mica granite and 200±2 Ma for the medium-fine grained two-mica granite are obtained.Both the two-mica granites show K₂O/Na₂O=1.13-1.75, and are enriched in Rb, Th and U etc while depleted in Sr, Ba, Co and Ni etc.REE compositions display strongly fractionated patterns, with (La/Yb)_N =6.08-51.84 and Eu/Eu*=0.15-0.65.In Sr-Nd-Hf isotopic compositions, they have initial ⁸⁷Sr/⁸⁶Sr ratios (ISr) of 0.707 12-0.711 37, εNd(t) values of-10.36 to-8.43 and zircon εHf(t) values of-11.8 to-1.1.Geochemical and Sr-Nd-Hf isotopic compositions suggest that the magmas for the medium-grained and medium-fine grained two-mica granites were derived from patial melting of argillaceous and greywacke sediments, respectively.According to the combined analysis of geological background, regional tectono-magmatic events and magmatism composition, Indosinian lithospheric delamination can account for the magma generation of the Markan strongly peraluminous granites.The Indosinian lithospheric delamination resulted in mantle asthenospheric upwelling, which promoted not only partial melting of the thickened lower crust (e.g.the adakitic and I-type granitoid magma gerneration), but also partial melting of the middle-lower crust (e.g.the Markan granite gerneration).This indicates that the Indosinian lithospheric delamination in the Songpan fold belt had resulted in partial melting at different levels of crust.
- strongly peraluminous granite,
- U-Pb zircon dating,
- geochemistry,
- Sr-Nd-Hf isotopes,
- petrogenesis,
- Songpan fold belt.

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References(74)

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Petrogenesis of Strongly Peraluminous Granites in Markan Area, Songpan Fold Belt and Its Tectonic Implication

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