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Strain and kinematic vorticity analysis of the Louzidian low-angle ductile shear detachment zone in Chifeng, Inner Mongolia, China

Content Provider	Springer Nature Link
Author	Li, JianBo Wang, Tao Ouyang, ZhiXia
Copyright Year	2010
Abstract	The Louzidian low-angle ductile shear detachment zone at the south of Chifeng is a SE-dipping, low-angle normal fault system. It is composed mainly of ductile shear zone, ductile-brittle shear zone and brittle fault zone. The ductile shear zone consists of, from bottom to top, mylonitic rocks, protomylonites and mylonites. Finite strain measurement of feldspar strain markers from those rocks using the R $_{ f }$/ϕ method shows that strain intensities (Es) of the mylonite at core of the ductile shear zone (Es=0.65–0.96) are higher than those of the mylonitic rocks close to the granite intrusions (Es=0.59–0.62) and of the protomylonites at top of the ductile shear zone (Es= 0.47–0.70), and the strain types of the protomylonites and mylonties are elongate strain and plane-flattening strain, respectively. The kinematic vorticity values (W $_{ k }$) estimated by the Polar Mohr diagram and the Rigid Grain Net range from 0.81 to 0.90 with an average of 0.85 for the protomylonites, and from 0.53 to 0.80 with 0.66 on average for the mylonites; Wk values of the extensional crenulation cleavage, i.e., C′, estimated by C′ method range from 0.63 to 0.37 with an average of 0.50. The angles between the maximum principal stress and shearing direction determined using the Maximum effective moment criterion evolved from 61° to 69° and to 75°, and finally normal to shearing direction. The results of strain and kinematic vorticity measurements suggest that high strain corresponds to low kinematic vorticity. Kinematic vorticity measurements show that the Louzidian low-angle ductile shear detachment zone is a result of a combination of simpledominated general shearing at the early stage and pure-dominated general shearing at the late stage. All these, together with isotope geochronology and regional tectonic background, suggest that the Louzidian ductile shear detachment zone resulted from a combination of crust extension and magma intrusion. The model of simple shear at the early stage and pure shear at the late stage in the formation of metamorphic core complex has probably general significance.
Starting Page	1611
Ending Page	1624
Page Count	14
File Format	PDF
ISSN	16747313
Journal	Science in China Series D: Earth Sciences
Volume Number	53
Issue Number	11
e-ISSN	18691897
Language	English
Publisher	SP Science China Press
Publisher Date	2010-09-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Louzidian low-angle ductile shear detachment zone mylonite strain intensity kinematic vorticity principal stress Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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