کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9522127 1634962 2005 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Early magnetic field and magmatic activity on Mars from magma ocean cumulate overturn
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Early magnetic field and magmatic activity on Mars from magma ocean cumulate overturn
چکیده انگلیسی
Significant and perhaps complete melting of the young terrestrial planets is expected from their heat of accretion and core formation. The process of subsequent magma ocean fractional solidification creates a cumulate mantle unstable to gravitational overturn. Overturn should be fast (≤ 1 to 10 Ma) and result in increasing mantle density with depth. This stable stratification inhibits later thermal convection, preserving geochemical heterogeneities. Overturn places cold cumulates against the core-mantle boundary, which creates sufficient heat flux to drive a core dynamo, producing a brief, strong magnetic field. During overturn, hot cumulates rise from depth and melt adiabatically, creating an early crust to record this field and leaving behind mantle reservoirs with isotopic fractionations dating from the early evolution of the planet.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 236, Issues 1–2, 30 July 2005, Pages 1-12
نویسندگان
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