西秦岭党川地区花岗岩的成因及其构造意义

王婧; 张宏飞; 徐旺春; 蔡宏明

Volume 33 Issue 4

Jul. 2008

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Article Navigation > Earth Science > 2008 > 33(4): 474-486

WANG Jing, ZHANG Hong-fei, XU Wang-chun, CAI Hong-ming, 2008. Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication. Earth Science, 33(4): 474-486.

Citation:

WANG Jing, ZHANG Hong-fei, XU Wang-chun, CAI Hong-ming, 2008. Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication. Earth Science, 33(4): 474-486.

WANG Jing, ZHANG Hong-fei, XU Wang-chun, CAI Hong-ming, 2008. Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication. Earth Science, 33(4): 474-486.

Citation:

WANG Jing, ZHANG Hong-fei, XU Wang-chun, CAI Hong-ming, 2008. Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication. Earth Science, 33(4): 474-486.

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Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication

WANG Jing^{1, 2},
ZHANG Hong-fei^{1, 2
,
,},
XU Wang-chun^{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: 2007-08-15
Publish Date: 2008-07-25

Abstract

Abstract

This paper carries out a study of U-Pb zircon dating using LA-ICP-MS method, geochemical and Sr-Nd-Pb isotopic compositions of the Dangchuan and Shimen granites in Dangchuan area of the West Qinling orogenic belt.The results show that the Dangchuan and Shimen granites have magma crystallization ages of 438±3Ma and 220±2Ma, respectively.Geochemical signatures indicate that the Dangchuan granite is similar to C-type adakitic rock that resulted from partial melting of thickened crustal material and the Shimen granite is similar to common anatexis-type granite.The Dangchuan granite has initial Sr isotopic ratios (I_Sr) of 0.70660-0.70929 and ε_Nd (t) values of-2.24 to-4.48, and the Shimen granite has I_Sr of 0.70581-0.70804 and ε_Nd (t) values of-3.73 to-4.72.The Sr-Nd isotopic composition of the Dangchuan and Shimen granites provides an additional eveidence that both the granites were derived from crustal source.However, Pb isotopic composition of the Dangchuan granite is distinct from that of the Shimen granite.The Dangchuan granite is characterized by more radiogenic Pb isotopic composition with initial Pb isotopic ratios of ²⁰⁶Pb/²⁰⁴Pb=18.288-18.484, ²⁰⁷Pb/²⁰⁴Pb=15.677-15.693 and ²⁰⁸Pb/²⁰⁴Pb=38.182-38.283, whereas the Shimen granite is characterized by relatively less radiogenic Pb isotopic composition with initial Pb isotopic ratios of ²⁰⁶Pb/²⁰⁴Pb=17.989-18.189, ²⁰⁷Pb/²⁰⁴Pb=15.560-15.567 and ²⁰⁸Pb/²⁰⁴Pb=37.982-38.000.It is strongly suggested that the magmas of the Dangchuan and Shimen granites were derived from different crustal sources.The Early Paleozoic and Early Mesozoic tectono-magma events, their petrogenesis and magma sources of Dangchuan area in the West Qinling orogenic belt can be comparable with those of the North Qinling tectonic unit in the East Qinling orogenic belt, indicating that the North Qinling tectonic unit can be extended to Dangchuan area in the West Qinling orogenic belt.In the East Qinling orogenic belt, the South Qinling continental crust was subducted beneath the North Qinling crust due to Early Mesozoic continental collision between the Yangtze and North China blocks.This continental subduction also occurred in the West Qinling orogenic belt.
- West Qinling orogenic belt,
- granite,
- U-Pb zircon dating,
- Sr-Nd-Pb isotopes,
- petrogenesi

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Petrogenesis of Granites from Dangchuan Area in West Qinling Orogenic Belt and Its Tectonic Implication

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