کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4742918 | 1641603 | 2006 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetostratigraphy from downhole measurements in ODP holes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The “Geological High-resolution Magnetic Tool” (GHMT) was used on 17 ODP Legs to obtain downhole logs of magnetic field strength and magnetic susceptibility. The remanent magnetization of the sediment around the borehole is derived from these measurements, and used to produce magnetostratigraphies. This review of the ODP GHMT data indicates that reliable magnetostratigraphies can usually be obtained from reasonably well-magnetized (above approximately 10â3Â A/m) fine-grained sediments. Additionally, the GHMT data indicates that a drill-string overprint, common in data collected on cores, does not significantly affect the sediments surrounding the borehole. This allows us to use the remanent and induced magnetization data to obtain estimates of relative paleointensity, and when averaged over time in homogenous sediment, the paleomagnetic recording efficiency of that sediment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 156, Issues 3â4, 14 July 2006, Pages 261-273
Journal: Physics of the Earth and Planetary Interiors - Volume 156, Issues 3â4, 14 July 2006, Pages 261-273
نویسندگان
Trevor Williams,