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 6 m0 V# Y% a) y, g+ \! _8 S1 S
COVER Polished thin section (70 micrometers) of volcanic glass, sample
) i" s2 n# X$ n- y k& f$ F3 |' tcatalog number NMNH115296-3, in transmitted light (14 by 18 millimeters). Molten ' U: {1 S$ n B# F/ D7 E$ N; ^9 n
lava erupted onto the sea floor freezes to glass and minerals that contain clues - m6 W) D q/ Z& ]6 Y1 {
to the lava's ancient past and origin in Earth's deep interior. Volcanic glasses . g* q7 @) f. Y3 x4 V0 c
such as this one may reveal a link between Earth's oxidation state and the deep - i2 M7 U: L8 |8 A7 {# I
carbon cycle. See page 1314.
+ B! P/ I/ `$ {8 `- Y7 rImage: G. Macpherson, T. Gooding, and E. Cottrell
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发表于 2013-6-14 12:57
发表于 2013-6-14 14:49
