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Equation of state of solid solution Mg 2.4 Fe 0.6 Al 2 Si 3 O 12 measured in diamond anvil cell Shu Huang, Jiuhua Chen, Bin Yang, Vadym Drozd, Andriy Durygin.

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Presentation on theme: "Equation of state of solid solution Mg 2.4 Fe 0.6 Al 2 Si 3 O 12 measured in diamond anvil cell Shu Huang, Jiuhua Chen, Bin Yang, Vadym Drozd, Andriy Durygin."— Presentation transcript:

1 Equation of state of solid solution Mg 2.4 Fe 0.6 Al 2 Si 3 O 12 measured in diamond anvil cell Shu Huang, Jiuhua Chen, Bin Yang, Vadym Drozd, Andriy Durygin Cesmec, Florida International University Miami, Fl, 33199

2 Introduction Garnets are important minerals in the upper mantle; knowledge of their equation of states is essential for construction of upper mantle composition models. P-V measurements on garnet Py 80 Alm 20 (Mg 2.4 Fe 0.6 Al 2 Si 3 O 12 ) at room temperature and pressure up to 9.3GPa. investigate the compositional dependence of bulk modulus of garnets along pyrope-almandine join.

3 Experiment synthesized in multi anvil cell at 2.8GPa and 1250 o C for 20 hours using mixture of end member glasses, pyrope and almandine, at a mole ratio of 4:1. The synthesis procedure followed the approach C.A Geiger (1987). P-V experiment at Cornell High energy synchrotron source (CHESS).

4 Equation of state K 0 '=5.45 and V 0 =1511.4(4) Å 3, K 0 =178(3) GPa at room temperature by EOSfit.

5 This work fits in between K 0 range of pyrope and almandine and it is ~4% less compressible than pyrope garnet, in which K 0 generally between 170-175 GPa, and not higher than K 0 of almandine. Therefore, it is indicated that K 0 value of pyrope garnet increase as its almandine content increasing, SampleK0K0 K0'K0' MethodReference Almandine185(3)4.2xrdZhang et al. 1998 174(1)6.2(5)usWang and Ji 2001 Pyrope171(2)4.4(2)xrdZhang et al. 1998 170(2)5.3(4)usChen et al. 1999 175(1)4.5(5)xrdLevien et al. 1979 172.83.8(1)xrdLeger et al.1990 174(3)4xrdHazen et al.1 1994 Py 60 Alm 31 1775.45(fixed)xrdTakahashi and Liu 1970 Py 22 Alm 72 1735.45(fixed)xrdTakahashi and Liu 1970 Alm 86 Py 7 Spe 7 177(2)4(fixed)xrdFan et al. 2009 Py 73 Alm 16 And 4 Uv 6 169.4--- Suzuki et al. 1983 Py 80 Alm 20 178(3)5.45(fixed)XrdThis work

6 Fig.3 Relation of bulk modulus in terms of almandine content Fan et al (2009) (fig.3). Substitute X alm =20% into this equation, K 0 is calculated to be between 168.14GPa and 177.22GPa. our experimental data (178(3)GPa) is close to the extrapolated higher value. Suzuki et al. (1983) measured the nature pyrope (Py 73 Alm 16 And 4 Uv 6 ), close composition as our sample, and presented =169.4GPa, which is lower than that of pure pyrope. Thus, additional experiments are needed to constrain this function.

7 Reference 1.Angel R. 2000. Equation of state. Hightemperature and High-pressure Crystal Chemistry. 2. Dawei Fan, Wenge Zhou et al. The thermal equation of state of (Fe 0.86 Mg 0.07 Mn 0.07 ) 3 Al 2 Si 3 O 12 almandine. Mineralogical Magazine, 2009, vol. 73(1) 95–102. 3. Hazen RM, Down RT, Conrad PG, Finger LW, Gasparik T. Comparative compressibilities of majorite-type garnets. 1994.Phys Chem Minerals 21:344-349. 4. I. Suzuki, O.L. Anderson, Elasticity and thermal expansion of a natural garnet up to 1000 K. 1983.J. Phys. Earth,vol 31,125-138. 5. Jamieson et al. 1982 high pressure research in geophysics.P27. 6. Leger JM, Redon AM, Chateau C. Compression of synthetic pyrope, spessartine and uvarovite garnets up to 25 GPa. 1990.Phys Chem Miner vol 17:161-167. 7. Levien L, Prewitt CT, Weidner DJ.Compression of pyrope. 1979. Am Mineral vol 64:805-808. 8. Li. Zhang, H. Ahsbahs, A. Kutoglu et al. Hydrostatic compression and crystal structure of pyrope to 33 GPa.1998. Phys Chem Minerals,vol 25:301-307. 9. Li Zhang, H. Ahsbahs, A. Kutoglu, C.A. Geiger. Single-crystal hydrostatic compression of synthetic pyrope, almandine,spessartine, grossular and andradite garnets at high pressures.1999. Phys Chem Minerals vol 27: 52-58. 10. Taro Takahashi, Lin-Gun Liu. Compression of Ferromagnesian G arnets and the Effect of Solid Solutions on the Bulk Modulus. 1970. Journal of Geophysical research. vol 75, No.29. 11. Yanbin Wang, Donald J. Weidner, Jianzhong Zhang, Gabriel D. Gwanrnesia, Robert C. Thermal equation of state of garnets along the pyrope-majorite join.1998. Physics of the Earth and Planetary Interiors. Vol 105,59- 71. 12.Yu Nishihara, Ichiro Aokia et al. Thermal equation of state of majorite with MORB composition. 2005.Physics of the Earth and Planetary Interiors.vol 148, 73–84.

8 Thank you!

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