کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4680889 | 1634948 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gravitational depletion of the early Earth's upper mantle and the viability of early plate tectonics
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
Numerical modelling of stirring of subducted mafic (oceanic) crust in the hot early mantle yields an upper mantle strongly depleted of mafic components due to gravitational settling, while the lower mantle becomes marginally enriched, with a thin dense layer at the base. These results accord with the very early and strong depletion of incompatible trace elements in the mantle source of the oldest rocks. They support a recent geochemical argument that the depletion is due more to the extraction of mafic material rather than of continental crust. The strong depletion would yield a thin oceanic crust, despite the high temperature of the mantle, which would make early plate tectonics more viable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 243, Issues 3â4, 30 March 2006, Pages 376-382
Journal: Earth and Planetary Science Letters - Volume 243, Issues 3â4, 30 March 2006, Pages 376-382
نویسندگان
Geoffrey F. Davies,