کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6444969 | 1640519 | 2014 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Syn- to late-orogenic quartz veins marking a retrograde deformation path in a slate belt: Examples from the High-Ardenne slate belt (Belgium)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
An integrated structural, petrographic and microthermometric methodology has been applied on syn- to late-orogenic quartz veins from the High-Ardenne slate belt (Belgium) to define their relative timing. The quartz precipitates, which do not show any mutual cross-cutting relationships, represent the meso-scale brittle accommodation during fold initiation, amplification and locking. Crystal-plastic deformation structures and P-T trapping conditions indicate that the different processes accommodating folding occurred in a progressive manner along a retrograde deformation path, associated with the gradual exhumation of the slate belt from ca. 7.5 to 6 km depth. Successive veining occurred from peak metamorphic conditions (ca. 300 °C and 190 MPa), measured in extrados veins, to subsequent lower P-T conditions in the periphery of a lenticular vein (ca. 275 °C and 180 MPa), late-orogenic saddle reef filling (ca. 245 °C and 160 MPa), and the core of a lenticular vein (ca. 220 °C and 150 MPa). Open-cavity growth and fluid-assisted brecciation indicate that veining occurred under overpressured fluid conditions. It is therefore fair to assume that the High-Ardenne slate belt acted - at least episodically - as a mid-crustal overpressured fluid reservoir, not only in the earliest and latest stages, but also during the main stage of orogeny.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 58, January 2014, Pages 43-58
Journal: Journal of Structural Geology - Volume 58, January 2014, Pages 43-58
نویسندگان
Dominique Jacques, Tine Derez, Philippe Muchez, Manuel Sintubin,