祁连山东南段加里东造山期构造变形年代的精确限定及其意义

樊光明; 雷东宁

Volume 32 Issue 1

Jan. 2007

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FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.

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FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.

FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.

Citation:

FAN Guang-ming, LEI Dong-ning, 2007. Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian. Earth Science, 32(1): 39-44.

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Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian

Received Date: 2006-06-02
Publish Date: 2007-01-25

Abstract

Abstract

The middle Qilian orogenic belt and Lajishan orogenic belt of the Caledonian strike NW-SE direction in the southeast Qilian and its basement consists of Pre-Caledonian metamorphic rock series. The lozenge-cancellate-shaped ductile shear zone occurs in the crystalline basement, and the included angle of shortening direction of conjugated ductile shear zones ranges from 104° to 114° and the max principal stress direction indicates approximate SW210°. The ⁴⁰Ar-³⁹Ar plateau ages of muscovite obtained from the mylonitilization rock in ductile shear zone of Jinshaxia within middle Qilian massif and Keque in Hualong massif are (405.1±2.4) Ma and (418.3±2.8) Ma, respectively. The chronology data determine the ductile shear zones in Caledonian basement metamorphic rock formed through the Caledonian orogeny. Furthermore, the chronological study of basement rock determines precise forming period for the close of the Late Paleozoic volcanic basin (or island-arc basin) and Lajishan ocean basin. This offers a new approach to the determination of ocean basin closing time in the process of structural evolution of orogenic belt.
- southeast Qilian,
- Caledonian orogenic belt,
- ductile shear zone,
- metamorphism and deformation events,
- structure-heat chronology

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References

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Precise Timing and Significance of Caledonian Structural Deformation Chronology in Southeast Qilian

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