Tectonic Environmental Analysis of Turpan一Hami Basin On the Genetic Relationship Between Basin and Orogenic Belt of Continental Inner Plate

Tao Ming Xin

The academic circles have considered Turpan-Hami Basin is a compressional one by plate collision, but the research of this paper shower Turpan-Harm Basin is similar to the extensional basins of East China in many ways, such as sedimental evolution，structural deformation，basin texture and crust-mantle texture reflected by the similar geophysic fields and so on. From the Late Permian Period，Turpan-Hami Basin began developing and kept up a steady spreading two cycles for a very long time(P₂-J₂,K₂-N₂). Two compressional tectogenesis (Huoyanshan and Xiyu) took place and the two spreading and sedimentary cycles were checked by the two movements in the Late Jurassic and the end of the Tertiary Period，respectivelly，and the extensional structure of the basin was reformed at the same times. The basin extension is a result of the mantle diapirism. Due to the basin extension，the adjacent regions (Tianshan Orogenic Belt) north and south to the basin had been compressed and deformed plastically (folding and upwarping). The stress accumulated with the plastic deformation in the rocks was so stronger that faulting took place, releasing the stress. The compressional movements occured when the faulting reacted on the basin，and the sedimentation discontinued. Combining the geological features with experimental results, we propose a new viewpoint that Turpan-Hami Basin is a extensional basin. Thus a new theory or model about the dynamics and kinematics of continental inner plate is described as follows; mantal diapirism- basin extension- folding and accumulating stress in adjacent regions(orogenic belts)-releasing the stress-basin lifting and sedimentation discontinuance.

Tectonic Environmental Analysis of Turpan一Hami Basin On the Genetic Relationship Between Basin and Orogenic Belt of Continental Inner Plate

State Key Laboratory of Oas-geochemistry,lanzhou Institute of Geology,Chinase Academy of Sciences, Lanzhou, 730000

Received Date: 1993-12-02

Publish Date: 1994-12-10

Key words:

Abstract: The academic circles have considered Turpan-Hami Basin is a compressional one by plate collision, but the research of this paper shower Turpan-Harm Basin is similar to the extensional basins of East China in many ways, such as sedimental evolution，structural deformation，basin texture and crust-mantle texture reflected by the similar geophysic fields and so on. From the Late Permian Period，Turpan-Hami Basin began developing and kept up a steady spreading two cycles for a very long time(P₂-J₂,K₂-N₂). Two compressional tectogenesis (Huoyanshan and Xiyu) took place and the two spreading and sedimentary cycles were checked by the two movements in the Late Jurassic and the end of the Tertiary Period，respectivelly，and the extensional structure of the basin was reformed at the same times. The basin extension is a result of the mantle diapirism. Due to the basin extension，the adjacent regions (Tianshan Orogenic Belt) north and south to the basin had been compressed and deformed plastically (folding and upwarping). The stress accumulated with the plastic deformation in the rocks was so stronger that faulting took place, releasing the stress. The compressional movements occured when the faulting reacted on the basin，and the sedimentation discontinued. Combining the geological features with experimental results, we propose a new viewpoint that Turpan-Hami Basin is a extensional basin. Thus a new theory or model about the dynamics and kinematics of continental inner plate is described as follows; mantal diapirism- basin extension- folding and accumulating stress in adjacent regions(orogenic belts)-releasing the stress-basin lifting and sedimentation discontinuance.

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Tectonic Environmental Analysis of Turpan一Hami Basin On the Genetic Relationship Between Basin and Orogenic Belt of Continental Inner Plate

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