کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5781549 | 1636694 | 2017 | 46 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetic fabrics and rock magnetism of the Xiong'er volcanic rocks and their implications for tectonic correlation of the North China Craton with other crustal blocks in the Nuna/Columbia supercontinent
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
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چکیده انگلیسی
The tectonic background of the Paleoproterozoic Xiong'er volcanic rocks (XVR) is important for understanding the tectonic evolution of the North China Craton (NCC), as well as its paleogeographic position during the assembly of the Nuna/Columbia supercontinent. Here we report the results of the first anisotropy of magnetic susceptibility (AMS) study of the XVR, and use the interpreted flow directions to constrain the emplacement mechanism and to assess its geological significance for the reconstruction of the Nuna/Columbia supercontinent. Thirty lavas were sampled from three sections in western Henan Province. Detailed rock magnetic analyses, including measurements of hysteresis loops, magnetization versus temperature curves and first order reverse curves, were performed to identify the main magnetic phases and grain sizes. The inferred directions from the AMS results reveal a radial flow pattern with an eruption center probably located near Xiong'er Mountain. Our data suggest that the XVR may have been emplaced in a triple-conjugated continental rift on the south margin of the NCC, probably initiated from a paleoplume. Based on this interpretation, a comparison of geological and paleomagnetic results among the proposed crustal blocks in the Nuna/Columbia supercontinent suggests a close linkage of the NCC with São Francisco-Congo, Rio de la Plate and Siberia.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volumes 712â713, 21 August 2017, Pages 415-425
Journal: Tectonophysics - Volumes 712â713, 21 August 2017, Pages 415-425
نویسندگان
Huiru Xu, Zhenyu Yang, Peng Peng, Kunpeng Ge, Zhenmin Jin, Rixiang Zhu,