《科学》[Science]13年6月14日出版pdf全文

nero1981

0 k5 x% ?" T# y2 pCOVER Polished thin section (70 micrometers) of volcanic glass, sample ! B( J" G5 h( q& x  Z. x8 W/ ]5 H( a
catalog number NMNH115296-3, in transmitted light (14 by 18 millimeters). Molten
) ?- [4 M0 [" @# ~. o- c# ^: flava erupted onto the sea floor freezes to glass and minerals that contain clues
; K% V( E- y- A' U6 z$ wto the lava's ancient past and origin in Earth's deep interior. Volcanic glasses 1 n! U" _6 g+ e) l
such as this one may reveal a link between Earth's oxidation state and the deep   n/ |; H  r5 `  q
carbon cycle. See page 1314.
0 O" E* s4 C+ P" O# x+ `1 GImage: G. Macpherson, T. Gooding, and E. Cottrell
8 T* _- J2 x& o

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