Kinematic Vorticity of the Daqingshan Detachment Fault and its Structural Implications
详细信息
- 责任者：Liu Jiang (Key Laboratory of Orogenic Belts and Crustal Evolution ; Ministry of Education ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Zhang Jinjiang
- 刊名：Geotectonica et Metallogenia
- 出版年：2011
- 卷期：35(1)
- 关键词：伸展断层 ; extension faults ; 大青山 ; Daqing Mountains
- 页码：p.1-11
- 图表：8 illus., 1 table, 23 refs.
- 分类号：0300
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
Kinematic vorticity (Wk) is defined to quantify the relative contributions of pure shear component and simple shear component in ductile deformation zone, and is a very important constraint on the evolution of a ductile shear zone. Ductile shear zone of the Daqingshan detachment fault which superimposed on the Mesozoic thrusts is exposed on both southern and northern limbs of Hohhot metamorphic core complex, with a top to south-east detachment direction. The result shows that the fault experienced a progressive increase of simple shear component until complete simple shear in the earlier stage (higher temperature), 0.94～1.00. Mean vorticy (Wm) increased along the direct of detachment, from 0.22～0.31 to 0.95～1.00,due to the thickening and thinning deformation transition. The northern part is at the centre of thrust and have a higher pure shear component. The simple shear component decreased while pure shear component increased in the later stage (lower temperature), from 0.73～0.81. Pure shear component increases from ductile penetrative brittle-ductile-ductile stain partitioning during exhumation.
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