کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5781512 | 1636698 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New isotopic age data constrain the depositional age and accretionary history of the Neoproterozoic-Ordovician Mona Complex (Anglesey-Lleyn, Wales)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: New isotopic age data constrain the depositional age and accretionary history of the Neoproterozoic-Ordovician Mona Complex (Anglesey-Lleyn, Wales) New isotopic age data constrain the depositional age and accretionary history of the Neoproterozoic-Ordovician Mona Complex (Anglesey-Lleyn, Wales)](/preview/png/5781512.png)
چکیده انگلیسی
Our geochronological data give minimum (K-Ar) depositional ages of 578-530Â Ma on phengites and maximum (U-Pb zircon) depositional ages of 878-550Â Ma, which indicates that the sediments in the structurally uppermost Gwna Group were deposited earlier than those in the middle New Harbour Group (maximum depositional ages of 548-515Â Ma, this study) and earlier than in the lowermost South Stack Group (maximum depositional ages of 569-522Â Ma, this study). Phengite-rich schists in the Blueschist unit and the CSZ show indistinct K-Ar ages ranging from ca. 578 to 530Â Ma. However, the K-Ar age of the New Harbour Group is ca. 474Â Ma, which we interpret to reflect a later metamorphic event. In a larger perspective, our new ages are broadly contemporaneous with the calc-alkaline continental arc magmatism in NW Wales and Central England that formed by successive eastward subduction from ca.711 to 474Â Ma.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volumes 706â707, 5 June 2017, Pages 164-195
Journal: Tectonophysics - Volumes 706â707, 5 June 2017, Pages 164-195
نویسندگان
Hisashi Asanuma, Wataru Fujisaki, Tomohiko Sato, Shuhei Sakata, Yusuke Sawaki, Kazumasa Aoki, Yoshihiro Okada, Shigenori Maruyama, Takafumi Hirata, Tetsumaru Itaya, Brian F. Windley,