Evolution of the Yiwulushan metamorphic core complex from distributed to localized deformation and its tectonic implications
Identifieur interne : 001435 ( Main/Exploration ); précédent : 001434; suivant : 001436Evolution of the Yiwulushan metamorphic core complex from distributed to localized deformation and its tectonic implications
Auteurs : Bilong Zhang [République populaire de Chine] ; Guang Zhu [République populaire de Chine] ; Dazhi Jiang [Canada] ; Changcheng Li [Canada] ; Yin Chen [République populaire de Chine, Canada]Source :
- Tectonics [ 0278-7407 ] ; 2012-08.
Abstract
The Yiwulushan metamorphic core complex (YSMCC) is situated in the northern part of the eastern North China Craton (NCC) that experienced significant lithospheric thinning in an extensional regime during the Late Mesozoic. We present structural and geochronological evidence to show that the YSMCC underwent NNE‐SSW extension in the Late Jurassic and WNW‐ESE extension in the Early Cretaceous. We show that the YSMCC started with a sub‐horizontal shear zone referred to as the Yiwulushan detachment shear zone (YDSZ) in the Late Jurassic between 157 and 147 Ma with a top‐to‐the‐SSW shear sense. The YDSZ was subjected to limited doming probably toward the end of its formation. The NNE‐striking, WNW‐dipping Waziyu normal shear zone (WZYSZ) was formed along the western margin of the core complex during the Early Cretaceous, and truncates the earlier YDSZ. The whole core complex underwent doming in a rolling‐hinge manner in the end of the latest Early Cretaceous. Thereafter, the YSMCC was overprinted by brittle normal faults along its western margin in the Late Cretaceous. Development of the initially flat‐lying YDSZ is associated with diffuse mid‐crustal flow whereas the formation of the rolling‐hinge type WZYSZ is characterized by localized deformation. The Late Jurassic more diffuse deformation has a rather constant top‐to‐the‐SSW shearing and produced a variety of shear‐related structures such as recumbent isoclinal folds and transposition foliation. The YSMCC evolution also demonstrates that the Late Mesozoic extension along the northern part of the eastern NCC started as early as the Late Jurassic rather than the previously proposed Early Cretaceous.
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DOI: 10.1029/2012TC003104
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We present structural and geochronological evidence to show that the YSMCC underwent NNE‐SSW extension in the Late Jurassic and WNW‐ESE extension in the Early Cretaceous. We show that the YSMCC started with a sub‐horizontal shear zone referred to as the Yiwulushan detachment shear zone (YDSZ) in the Late Jurassic between 157 and 147 Ma with a top‐to‐the‐SSW shear sense. The YDSZ was subjected to limited doming probably toward the end of its formation. The NNE‐striking, WNW‐dipping Waziyu normal shear zone (WZYSZ) was formed along the western margin of the core complex during the Early Cretaceous, and truncates the earlier YDSZ. The whole core complex underwent doming in a rolling‐hinge manner in the end of the latest Early Cretaceous. Thereafter, the YSMCC was overprinted by brittle normal faults along its western margin in the Late Cretaceous. Development of the initially flat‐lying YDSZ is associated with diffuse mid‐crustal flow whereas the formation of the rolling‐hinge type WZYSZ is characterized by localized deformation. The Late Jurassic more diffuse deformation has a rather constant top‐to‐the‐SSW shearing and produced a variety of shear‐related structures such as recumbent isoclinal folds and transposition foliation. The YSMCC evolution also demonstrates that the Late Mesozoic extension along the northern part of the eastern NCC started as early as the Late Jurassic rather than the previously proposed Early Cretaceous.</div></front></TEI><affiliations><list><country><li>Canada</li><li>République populaire de Chine</li></country><region><li>Anhui</li></region><settlement><li>Hefei</li></settlement></list><tree><country name="République populaire de Chine"><region name="Anhui"><name sortKey="Zhang, Bilong" sort="Zhang, Bilong" uniqKey="Zhang B" first="Bilong" last="Zhang">Bilong Zhang</name></region><name sortKey="Chen, Yin" sort="Chen, Yin" uniqKey="Chen Y" first="Yin" last="Chen">Yin Chen</name><name sortKey="Zhu, Guang" sort="Zhu, Guang" uniqKey="Zhu G" first="Guang" last="Zhu">Guang Zhu</name></country><country name="Canada"><noRegion><name sortKey="Jiang, Dazhi" sort="Jiang, Dazhi" uniqKey="Jiang D" first="Dazhi" last="Jiang">Dazhi Jiang</name></noRegion><name sortKey="Chen, Yin" sort="Chen, Yin" uniqKey="Chen Y" first="Yin" last="Chen">Yin Chen</name><name sortKey="Li, Changcheng" sort="Li, Changcheng" uniqKey="Li C" first="Changcheng" last="Li">Changcheng Li</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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