《自然》[Nature]13年7月4日出版pdf全文

nero1981

: x2 w8 ?$ G, J
7 r2 w3 p7 @0 VThe most heavily cratered terrains on Mercury exhibit
! n/ x9 B" |0 K1 }3 O  @a lower density of craters smaller than about 100 km in diameter than on the 0 G0 {% J6 f7 [9 o5 V, ^
Moon, a deficit that has been attributed to resurfacing by formation of ancient
& H) q, G/ b9 a2 f/ }( p4 H$ s' pintercrater plains. Simone Marchi et al. used a crater areal density map $ L9 G( t6 r$ I+ _) \. d
based on data from the MESSENGER spacecraft (the colour-coded foreground on
: w, }1 T4 L$ y8 o! q" E" Y2 I) `" ccover, with a global surface mosaic in the background) to locate the oldest 4 a" k2 A8 h8 c% _2 Z0 y
surfaces on Mercury and interpret the crater populations in the framework of a
; D) i- c4 i$ N- Y4 Precent lunar crater chronology. They conclude that the oldest surfaces were
& `$ f7 n4 E' p- X( o. D! L: nemplaced just after the start of the Late Heavy Bombardment 4.0 to 4.1 billion
  c# `, u- N1 P! u7 e% x* B7 Nyears ago. The large impact basins, not previously dated, yield a similar
' s, S& }) P/ ]0 |5 }6 lsurface age. This agreement implies that resurfacing was global and due to 8 t- y: N& k# o9 n
volcanism, perhaps aided by heavy bombardment as previously suggested. Cover: ; D  z% C8 `7 m" e
Simone Marchi/MESSENGER data: NASA/JHUAPL/Carnegie Institution of Washington
  ?! M- a& k7 c$ t. o+ p: z# r. N9 r9 t8 w  b$ H  U( A

游客，如果你要查看本帖隐藏内容请回复

manybit

看看

yuheng

xiexie

eley

ding~~~~

exin11

zdgrp

好东西

zdgrp

看看

tpwang

回复 nero1981 的帖子, o) h, U' ^2 N8 U, p

) l( L0 j1 ]& F8 ^  P6 Ythanks

cz200203

THANKS

小24狼

谢谢  看看