دانلود مقاله ISI انگلیسی شماره 156701
کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
156701 2018 22 صفحه PDF سفارش دهید 18196 کلمه
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
“Isocrater” impacts: Conditions and mantle dynamical responses for different impactor types
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Icarus, Volume 306, 15 May 2018, Pages 94-115

پیش نمایش مقاله
پیش نمایش مقاله

چکیده انگلیسی

Impactors of different types and sizes can produce a final crater of the same diameter on a planet under certain conditions. We derive the condition for such “isocrater impacts” from scaling laws, as well as relations that describe how the different impactors affect the interior of the target planet; these relations are also valid for impacts that are too small to affect the mantle. The analysis reveals that in a given isocrater impact, asteroidal impactors produce anomalies in the interior of smaller spatial extent than cometary or similar impactors. The differences in the interior could be useful for characterizing the projectile that formed a given crater on the basis of geophysical observations and potentially offer a possibility to help constrain the demographics of the ancient impactor population. A series of numerical models of basin-forming impacts on Mercury, Venus, the Moon, and Mars illustrates the dynamical effects of the different impactor types on different planets. It shows that the signature of large impacts may be preserved to the present in Mars, the Moon, and Mercury, where convection is less vigorous and much of the anomaly merges with the growing lid. On the other hand, their signature will long have been destroyed in Venus, whose vigorous convection and recurring lithospheric instabilities obliterate larger coherent anomalies.

خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.