伊舒地堑基底花岗岩的锆石U-Pb年代学及其构造意义

许文良; 裴福萍; 高福红; 杨德彬; 卜永吉

Volume 33 Issue 2

Mar. 2008

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Article Navigation > Earth Science > 2008 > 33(2): 145-150

XU Wen-liang, PEI Fu-ping, GAO Fu-hong, YANG De-bin, BU Yong-ji, 2008. Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications. Earth Science, 33(2): 145-150.

Citation:

XU Wen-liang, PEI Fu-ping, GAO Fu-hong, YANG De-bin, BU Yong-ji, 2008. Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications. Earth Science, 33(2): 145-150.

XU Wen-liang, PEI Fu-ping, GAO Fu-hong, YANG De-bin, BU Yong-ji, 2008. Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications. Earth Science, 33(2): 145-150.

Citation:

XU Wen-liang, PEI Fu-ping, GAO Fu-hong, YANG De-bin, BU Yong-ji, 2008. Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications. Earth Science, 33(2): 145-150.

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Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Jilin Oilfield Branch Company of CNPC, Songyuan 138000, China

Received Date: 2007-09-20
Publish Date: 2008-03-25

Abstract

Abstract

LA-ICP-MS zircon U-Pb dating was carried out for two basement granites from the Yishu graben to compare the tectonic evolutionary history between the Yishu graben and Songliao basin. The results indicate that most of zircons from the basement granites are euhedral to subhedral in shape and show the typical oscillatory zoning with magmatic origin, some of which display the core-rim structure. Their Th/U ratios range from 0.32 to 2.76, implying that they should be from crystallization of magma. The dating results indicate that a weighted mean ²⁰⁶pb/²³⁸U age is 162±2 Ma for the basement granite from CHll well (sample No. CHll), and that weighted mean ²⁰⁶Pb/²³⁸U ages are 159±3 Ma and 176± 1 Ma for rims and cores of zircons from the granite in X13 well (sample No. X13), respectively. It is suggested that the basement granites were formed in late stage of the Middle Jurassic or the beginning of the Late Jurassic, which is consistent with ones of the latest basement granites from the Songliao basin. Therefore, it is proposed that the Yishu graben displays similar evolutionary history with the Songliao basin since the Yanshannian movement, which is also proved by the occurrence of the inherited zircons with age of 176±1 Ma.
- Yishu graben,
- basement,
- granite,
- zircon,
- LA-ICP-MS U-Pb dating,
- Songliao basin

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References

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Zircon U-Pb Age from Basement Granites in Yishu Graben and Its Tectonic Implications

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