کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4733834 | 1357054 | 2009 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multi-scale analysis of Proterozoic shear zones: An integrated structural and geophysical study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
Structural mapping of poorly exposed shear zone outcrops is integrated with the analysis of aeromagnetic and Bouguer gravity data to develop a multi-scale kinematic and relative overprinting chronology for the Palaeoproterozoic Tallacootra Shear Zone, Australia. D2 mylonitic fabrics at outcrop record Kimban-aged (ca. 1730-1690Â Ma) N-S shortening and correlate with SZ1 movements. Overprinting D3 sinistral shear zones record the partitioning of near-ideal simple shear and initiated Riedel to regional-scale SZ2 strike-slip on the Tallacootra Shear Zone (SZ2). Previously undocumented NE-SW extension led to the emplacement of aplite dykes into the shear zone and can be correlated to the (ca. 1595-1575Â Ma) Hiltaba magmatic event. D4 dextral transpression during the (ca. 1470-1450Â Ma) Coorabie Orogeny reactivated the Tallacootra Shear Zone (SZ2-R4) exhuming lower crust of the northwestern Fowler Domain within a positive flower structure. This latest shear zone movement is related to a system of west-dipping shear zones that penetrate the crust and sole into a lithospheric detachment indicating wholesale crustal shortening. These methods demonstrate the value of integrating multi-scale structural analyses for the study of shear zones with limited exposure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 31, Issue 10, October 2009, Pages 1238-1254
Journal: Journal of Structural Geology - Volume 31, Issue 10, October 2009, Pages 1238-1254
نویسندگان
John R. Stewart, Peter G. Betts, Alan S. Collins, Bruce F. Schaefer,