کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6447594 | 1641517 | 2013 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rock magnetic investigation of possible sources of the Bangui magnetic anomaly
ترجمه فارسی عنوان
بررسی مغناطیسی راک از منابع احتمالی انحنای مغناطیسی بنوشی
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کلمات کلیدی
انحنای مغناطیسی بنگو، مگنتیت، منبع زمین شناسی، مدل سازی، تشکیل آهن رشته ای،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
چکیده انگلیسی
The Bangui magnetic anomaly (BMA) is the largest lithospheric magnetic field anomaly on Earth at low latitudes. Previous studies investigated its geological source using constraints from satellite and ground magnetic field measurements, as well as from surface magnetic susceptibility measurements on rocks from the Panafrican Mobile Belt Zone (PMBZ). Here we combine magnetic field data modelling and rock magnetic property measurements (susceptibility and natural remanent magnetization, NRM) on many samples from this PMBZ and the surrounding formations. It reveals that NRM is a significant component of the total magnetization (Mt) of the BMA source, which reaches 4.3Â A/m with maximum thicknesses of 38 and 54Â km beneath the western and eastern parts of the BMA. Only the isolated and relatively thin banded iron formations and some migmatites show such Mt values. Thus we suggest that the thick BMA source may be composed either by overlapped slices of such metamorphic rocks, or by an iron-rich mafic source, or by a combination of these two geological structures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 224, November 2013, Pages 11-20
Journal: Physics of the Earth and Planetary Interiors - Volume 224, November 2013, Pages 11-20
نویسندگان
M. Ouabego, Y. Quesnel, P. Rochette, F. Demory, E.M. Fozing, T. Njanko, J.-C. Hippolyte, P. Affaton,