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We performed shock wave experiments on a natural pyroxene with chemical composition close to (Mg0.92, Fe0.08)SiO3 and initial density of 3.06 g/cm3 at pressures between 48 and 140 GPa, using impedance-match method and electrical probe technique. Considering McQueen et. al. data, it is obvious that (Mg0.92, Fe0.08)SiO3 goes through three phase regions in the procedure of shock compression: Low-pressure phase region (LPR), mixed phase region (MPR), and high-pressure phase region (HPR), corresponding to the pressure 0~40 GPa, 40~67 GPa and 68~140 GPa, respectively. In low-pressure phase region, the relationship between shock wave velocity D and particle velocity u was expressed by McQueen et. al. data. Then in high-pressure phase region (at pressures between 68 to 140 GPa), it can be described linearly from our experiment data. The calculated D-u relationship for the assemblage of (Mg0.92, Fe0.08)O(Mw)+SiO2(St) is significantly different from the experimental data, excluding the possibility of chemical decomposition of perovskite to oxides during the shock compression. The Grüneisen parameter γ can be obtained by fitting the experimental data. Using the third-order Birch-Murnaghan finite strain equation of state, the shock experimental data yield a zero-pressure bulk modulus K0S=259.6(9) GPa and its pressure derivative K′0S=4.20(5), with ρ0=4.19 g/cm3. A comparison of the experimental Hugoniot densities of perovskite with the PREM density profile prefers a perovskite-dominant lower mantle model.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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