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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Geodynamics of Mars ： ウィキペディア英語版 Geodynamics of Mars Mars was a geologically active place during its first billion years of existence, and particularly during its first 50 million years or so. In this time a metallic core, silicate mantle, and more than half of the crust formed by major melting. Within 15 million years (Ma) of the start of the solar system, a metallic core was made by iron dribbling to the center of the planet.〔(【引用サイトリンク】first=Taylor )〕 Both short-lived and long-lived radiogenic isotopes indicate that a large-ion lithophile enriched reservoir (which is the early "crustal" reservoir) separated from the primitive mantle very early in the history of Mars. Exact timing is less clear and generally model dependent but an age certainly in excess of 4.0 Ga and possibly approaching 4.5 Ga is likely. ==Core-mantle thermal evolution of early Mars== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geodynamics of Mars」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.