《科学》[Science]13年6月14日出版pdf全文

nero1981

9 i: U4 g5 X: G/ A  d( NCOVER Polished thin section (70 micrometers) of volcanic glass, sample ' f% }) e" `& G, `$ d+ s
catalog number NMNH115296-3, in transmitted light (14 by 18 millimeters). Molten
9 b0 i" K' A* A8 X) A. w0 P, |  I! Y* }5 qlava erupted onto the sea floor freezes to glass and minerals that contain clues 8 }, a$ [! F% Z( N$ A
to the lava's ancient past and origin in Earth's deep interior. Volcanic glasses ) s. @) o0 E& u3 |! Z' v) B. N
such as this one may reveal a link between Earth's oxidation state and the deep 4 B$ U0 n1 S7 j) o6 H
carbon cycle. See page 1314.
: O4 Q( i) {) D2 fImage: G. Macpherson, T. Gooding, and E. Cottrell 8 K- Q4 C4 @4 n& t

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