Comparative Compressibilities of Silicate Spinels: Anomalous Behavior of (Mg,Fe) 2 SiO 4

American Association for the Advancement of Science (AAAS) - Tập 259 Số 5092 - Trang 206-209 - 1993
Robert M. Hazen1
1Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, Washington, DC 20015-1305

Tóm tắt

Compressibilities of five silicate spinels, including γ-Mg 2 SiO 4 , γ-Fe 2 SiO 4 , Ni 2 SiO 4 , and two ferromagnesian compositions, were determined on crystals positioned in the same high-pressure mount. Subjection of all crystals simultaneously to the same pressure revealed differences in compressibility that resulted from compositional differences. Ferromagnesian silicate spinels showed an anomalous 13 percent increase in bulk modulus with increasing iron content, from Mg 2 SiO 4 (184 gigapascals) to Fe 2 SiO 4 (207 gigapascals). This result suggests that ferrous iron and magnesium, which behave similarly under crustal conditions, are chemically more distinct at high pressures characteristic of the transition zone and lower mantle.

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American Association for the Advancement of Science (AAAS)

Tập 259 Số 5092

206-209

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