کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5781786 | 1413899 | 2016 | 52 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geological features of the northeastern Canadian Arctic margin revealed from analysis of potential field data
ترجمه فارسی عنوان
ویژگی های زمین شناسی حاشیه قطب شمال کانادا در تجزیه و تحلیل اطلاعات میدان های بالقوه نشان داده شده است
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کلمات کلیدی
حاشیه قطب شمال کانادا، داده های مغناطیسی / مغناطیسی، دامنه مغناطیسی، نفوذ مگاتا، شبه گرایی، آلفا رید،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
The northeastern Canadian Arctic margin is bordered to the north by Alpha Ridge, a dominantly magmatic complex within the Amerasia Basin of the Arctic Ocean, which forms part of the High Arctic Large Igneous Province (HALIP). The characteristics of the gravity and magnetic anomaly fields change notably along the Arctic margin, with two main segments recognised. Aeromagnetic and gravity data in the transition zone between these contrasting domains of the Canadian Arctic margin are analysed here in detail. Results obtained using a variety of edge enhancement (derivative) methods highlight several magnetic domains and a major offshore sedimentary basin as well as some known and a number of previously unknown tectonic and magmatic elements. A magmatic intrusion distribution map derived from the edge enhanced magnetic anomaly maps reveals that magmatic rocks are much more widespread in the relatively shallow subsurface than implied by surface geological mapping. Magmatic intrusions (mainly dykes) and other geological structures have NW-SE, NE-SW and N-S major trends. Broad gravity and pseudogravity lows across most of the Sverdrup Basin region are due to thick, less dense sedimentary succession and low magnetised crust. Magnetic and pseudogravity highs observed over Alpha Ridge indicate high crustal magnetisation associated with the occurrence of extensive and voluminous crustal magmatic bodies. Absence of these volcanic and intrusive rocks in the imaged sedimentary basin beneath the northeast Canadian Arctic margin region suggests that the basin probably formed after the cessation of HALIP magmatism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 691, Part A, 22 November 2016, Pages 48-64
Journal: Tectonophysics - Volume 691, Part A, 22 November 2016, Pages 48-64
نویسندگان
Goodluck K. Anudu, Randell A. Stephenson, David I.M. Macdonald, Gordon N. Oakey,