کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6444365 1640371 2015 52 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Neoproterozoic to Early Paleozoic polyorogenic deformation in the southeastern margin of the Yangtze Block: Constraints from structural analysis and 40Ar/39Ar geochronology
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Neoproterozoic to Early Paleozoic polyorogenic deformation in the southeastern margin of the Yangtze Block: Constraints from structural analysis and 40Ar/39Ar geochronology
چکیده انگلیسی
The southeastern margin of the Yangtze Block is a suitable region to decipher Neoproterozoic to Early Paleozoic polyorogenic deformation of the South China Block. Based on 1:50,000-scale geological mapping, four deformational phases were identified through structural analysis and 40Ar/39Ar dating. The earliest event (D1) corresponds to nearly E-W-striking folding and top-to-the south thrusting, developed during Neoproterozoic orogeny caused by the collision between the Yangtze Block and the Cathaysia Block. The D2 event is characterized by the nearly E-W-striking top-to-the north thrusting. The D3 deformation is marked by the NNE-striking folding, thrusting and dextral shearing. The D3 structures constitute a positive flower pattern, with opposing kinematics, rooted in the Jiangwan dextral shear zone. The D4 event is the nearly E-W-striking ductile dextral shearing. 40Ar/39Ar geochronology shows that the NNE-trending dextral shearing and the nearly E-W-striking dextral shearing occurred at 449 ± 4 Ma and 429 ± 3 Ma, respectively. Combining with previous geochronology, all the D2, D3, D4 events are related to the Early Paleozoic orogeny. Both the D2 top-to-the north thrusts and D3 NNE-striking positive flower structures are syn-orogenic products. These incompatible syn-orogenic structures indicate that the orientation of the principal stress changed from the N-S-striking to E-W-striking at ∼450 Ma. The nearly E-W-striking ductile dextral shearing (D4) is the outcome of post-orogeny.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 98, February 2015, Pages 141-151
نویسندگان
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