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STATIC COMPRESSIBILITY OF MAGNESITE TO 20 GPA - IMPLICATIONS FOR MGCO3 IN THE LOWER MANTLE

Abstract:

The bulk modulus of MgCO3 magnesite has been measured to 20 GPa at room temperature using X-ray powder diffraction. Since the response to pressure is primarily compression of the MO6 octahedron, magnesite is substantially less compressible than Ca-carbonates of similar structure type. Using the Birch equation of state, with KT′ of 4.0, KT of 142 (±9) GPa at room temperature is obtained. The full Birch-Murnaghan equation of state yields KT of 151 (±7) GPa and KT′ of 2.5. These results have bee...

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Publication status:
Published

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Publisher copy:
10.1029/93GL02507

Authors


REDFERN, S More by this author
HENDERSON, C More by this author
Journal:
GEOPHYSICAL RESEARCH LETTERS
Volume:
20
Issue:
19
Pages:
2099-2102
Publication date:
1993-10-08
DOI:
ISSN:
0094-8276
URN:
uuid:47b4c9c9-c016-43eb-b4ee-515b430ce67a
Source identifiers:
172870
Local pid:
pubs:172870
Language:
English

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