کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10121312 | 1641616 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pyrrhotite pTRM acquisition in metamorphic limestones in the light of microscopic observations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
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![عکس صفحه اول مقاله: Pyrrhotite pTRM acquisition in metamorphic limestones in the light of microscopic observations Pyrrhotite pTRM acquisition in metamorphic limestones in the light of microscopic observations](/preview/png/10121312.png)
چکیده انگلیسی
The potential of pyrrhotite as a recorder of successive, independent pTRMs in graphite bearing metacarbonates depends on the amount and composition of metamorphic fluids. During its formation very low amounts of H2S dominated fluids will favour an in situ epitaxy of pyrrhotite at the expense of iron bearing minerals in its surroundings. The resulting particle assemblage of pyrrhotite is within the single domain grain-size range and exhibits a broad blocking temperature spectrum. With increasing fluid content the desulfidation of pyrite controls the pyrrhotite formation and results in large crystals up to several millimeters, where independent pTRMs cannot be expected. As both types are present in regional and contact metamorphic rocks, the existence of pervasive fluids determines whether or not pyrrhotite will be able to record successive pTRMs, i.e. changes of the earth magnetic field (EMF) during metamorphic cooling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics of the Earth and Planetary Interiors - Volume 151, Issues 1â2, 15 July 2005, Pages 107-114
Journal: Physics of the Earth and Planetary Interiors - Volume 151, Issues 1â2, 15 July 2005, Pages 107-114
نویسندگان
Florian Wehland, Oliver Eibl, Steffi Kotthoff, Ulrich Alt-Epping, Erwin Appel,