Snow line Ice line Frost line 45 Giant

スノーラインSnow line (Ice line, Frost line) 45

Giant impact was an energetic process Deep magma ocean or total melting of the Earth is compatible with the giant impact model A. G. W. Cameron 2011/12/21 ここまで

How deep was the terrestrial magma ocean ? What is the condition of the metal-silicate equilibrium, low pressure or high pressure ?

図１７ Sm Eu Gd

図 5 難揮発性の親石元素 Sc Ti Y La Eu Tb Lu Th. U V Sm Mg Si Ca Ba Ce. Nd Sr Yb Ta Li Zr Nb Al (Mantle+Crust)/C 1 1. 0 低 高 Cr 難揮発性の元素 揮発性・やや揮発性の元 素 ＜ 1300 K 親鉄元素 Fe 揮発性の程度 Cu Mn Ga Na Sn Co K 揮発性 元素 Rb 0. 1 Ni 親 鉄 元 素 0. 01 Zn P 強親鉄元素 In Re Cd Ge Ag 0. 01 0. 001 Tl Pb Ir Os Cs Au Bi

（Mantle composition/(CI-chondrite+Mg) Depletion factor 親鉄元素の枯渇 枯渇の理由 核に分配された （＋揮発性） Al Mg Ca Ti 分配係数, D C(CI chondrite) C(mantle) = ━━━━━━ F(core)・D + F(mantle) Si C (M) in metal D = ━━━━━━ C (M) in silicate, oxide Fe Co Ni F (core)=0. 325 F(mantle)=0. 675（wt. fraction） C: abundance（wt. %) Mc. Donough and Sun (1995) 低圧での平衡に比べてマントルに Ｎｉが多すぎる。 ３

Asuka 881757 (lunar meteorite) No. 9 No. 7 F d No. 11 Grain 2 the mean age of the glass and the maskelynite, 3798+/ -12 Ma of the 39 Ar-40 Ar ages Grain 3 Grain 1 No. 4 No. 12 F d F d No. 9 No. 1 No. 21 No. 5 16 No. 8 No. 6 3 No. 4 No. 11 No. 25 -26 No. 23 No. 22

http: //www. haberer-meteorite. de/english/Asteroid%202008%20 tc 3/Asteroid%202008%20 TC. html Meteorongs in large number (basalt) Almahata Sitta The main mass (in private hands) of 155, 57 g Coarse-grained Ureilite MS-170 Slices & fragments