کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487327 | 1666393 | 2017 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystallization and cooling conditions for diogenite formation in the turbulent magma ocean of asteroid 4 Vesta
ترجمه فارسی عنوان
شرایط بلور سازی و خنک سازی برای تشکیل دیوژنیت در اقیانوس ماگما آشفته سیارک 4 وستا
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
Despite its small size, the asteroid 4 Vesta has been completely differentiated to core and mantle. Its composition is similar to howardite-eucrite-diogenite (HED) meteorites of which the detailed petrology is known. Therefore, 4 Vesta is a good target for understanding the differentiation of terrestrial planets. A new differentiation model for crust formation has been developed by taking magma ocean fluid dynamics, chemical equilibrium, the presence of 26Al, and cooling into consideration with a special focus on crystal separation. The role of crystal size, thickness of the conductive lid, and fO2 are evaluated as parameters. The results show that large crystals of at least 1 cm settled and formed a kilometer-thick cumulate layer of orthopyroxene with Mg# of 0.70-0.90 in â¼20 thousand years, which almost agrees with the Mg # of diogenites. Smaller grain sizes formed thinner layers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 281, 1 January 2017, Pages 379-387
Journal: Icarus - Volume 281, 1 January 2017, Pages 379-387
نویسندگان
Yusuke Kawabata, Hiroko Nagahara,