کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9528385 | 1636671 | 2018 | 37 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The timing of high-temperature conditions and ductile shearing in the footwall of the Naxos extensional fault system, Aegean Sea, Greece
ترجمه فارسی عنوان
زمان بندی شرایط درجه حرارت بالا و برش مجسمه در پایه سیستم گسل اصطکاک نکسوز، دریای اژه، یونان
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
We present eight Rb-Sr multi-mineral isochron ages showing that high-temperature metamorphic conditions and partial melting during top-to-the-NNE extensional shearing in the footwall of the Naxos extensional fault system (i.e. Naxos metamorphic core complex) lasted until about 14-12â¯Ma. One migmatite sample yielded an age of 14.34â¯Â±â¯0.2â¯Ma (2Ï uncertainty) for crystallization of migmatization-related melt pockets. Four pegmatite samples, which are in part associated with partial melting of their host rocks, provided overlapping ages ranging from 13.81 to 12.23â¯Ma (age range includes 2Ï uncertainty). Additional three samples of amphibolite-facies schist supplied Rb-Sr ages of around 14â¯Ma. Samples showing fluid- and/or deformation-assisted white mica and biotite reworking gave Rb-Sr mineral apparent ages of 11.1â¯Â±â¯2.7, 10.16â¯Â±â¯0.24, 9.7â¯Â±â¯0.7 and 9.6â¯Â±â¯0.15â¯Ma. These ages are interpreted to be associated with late stages of extensional shearing under greenschist-facies metamorphic conditions. Together with published U-Pb zircon ages of migmatite, and S- and I-type granite crystallization, the data indicate that the presence of melt in the footwall of the Naxos extensional fault system lasted for at least 7â¯Ma (from ~18 to ~11â¯Ma). This demonstrates that high temperatures and crustal melting resulting from and aiding extensional deformation was a long-lived and not a transient event. We conclude that melt-assisted deformation facilitated large-scale displacement on the Naxos extensional fault system by drastically weakening the extending crust for long periods of time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 745, 16 October 2018, Pages 366-381
Journal: Tectonophysics - Volume 745, 16 October 2018, Pages 366-381
نویسندگان
Uwe Ring, Johannes Glodny, Alexandre Peillod, Alasdair Skelton,