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- P! h) W2 ]' _8 E0 }COVER Polished thin section (70 micrometers) of volcanic glass, sample 8 Z5 N7 |' J! \$ t/ G
catalog number NMNH115296-3, in transmitted light (14 by 18 millimeters). Molten
( s+ c6 K' ]& `! Q6 Clava erupted onto the sea floor freezes to glass and minerals that contain clues 6 I- t6 N4 k$ ]
to the lava's ancient past and origin in Earth's deep interior. Volcanic glasses
3 W, u0 |4 Z" Y7 l$ I+ S# F& [9 |: N$ Qsuch as this one may reveal a link between Earth's oxidation state and the deep 5 S' g1 m. N' }% Y
carbon cycle. See page 1314. , O: w e+ o2 I! i- Q8 E
Image: G. Macpherson, T. Gooding, and E. Cottrell 7 G: `$ F+ K9 q; t$ E! N
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发表于 2013-6-14 12:57
