کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4724414 1639705 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Paleoproterozoic tectonics in the Terre Adélie Craton (East Antarctica)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Paleoproterozoic tectonics in the Terre Adélie Craton (East Antarctica)
چکیده انگلیسی

This paper describes the deformation that occurred in the Paleoproterozoic terrains of the Terre Adélie Craton (East Antartica) at ca. 1.69 Ga. The structural pattern is marked by sub-vertical deformation zones, trending N340–360°, that rework sub-horizontal fabrics. Both types of structures developed under similar partial melting conditions (thermal and pressure peaks around 700–750 °C and 500–600 MPa, respectively) and are in part coeval. Vertical zones show kinematic indicators of dextral transpression. Strike-slip components appear to increase in intensity from W to E, toward the contact between Paleoproterozoic terrains and Archaean blocks located to the East. Flat-lying foliations bear stretching lineations, which strike N340–360°, at low-angle to the transpressional shear zones and to the boundaries between major units.Structural and metamorphic signatures are consistent with a model in which hot and weak continental domains converge toward a stiffer craton. Horizontal shortening was accommodated along vertical transpressional zones. Thickening combined with significant magmatic input might have triggered gravity-driven horizontal crustal flow at high angle to the convergence direction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precambrian Research - Volume 162, Issues 3–4, 1 May 2008, Pages 531–539
نویسندگان
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