Research Progress of the Equation of State for Garnet Minerals
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摘要: 石榴子石是重要的造岩矿物,是上地幔、地幔转换带以及(超)高压变质岩中最重要的造岩矿物之一,研究其状态方程对于约束地球内部物质组成和状态、正确理解大洋岩石圈俯冲板块和地幔动力学过程具有重要意义。文中综述了20世纪70年代以来石榴子石p-V(压强-晶胞体积)和p-V-T(压强-晶胞体积-温度)状态方程的研究进展,重点讨论高温高压条件下石榴子石的稳定性以及组分变化和含水对热弹性参数的影响。最后简略概括石榴子石状态方程研究存在的问题,并指出发展方向。Abstract: As an important rock-forming mineral of the rocks in the earth, garnet is one of the most important minerals in the upper mantle, transition zone and (ultra) high pressure metamorphic rocks.The study of its equation of state is therefore of great significance in laying a foundation for constraining the state and chemical composition of the earth interiors, and further understanding the geodynamical processes of the subducted oceanic lithosphere plate and Earth's mantle.This article summarized the recent advances in the studies of the p-V (pressure-cell volume) and p-V-T (pressure-cell volume-temperature) equation of state of the garnet, focusing on the phase stability, the effect of component and hydrogen on the thermal elastic parameters of the garnet at high pressure and high temperature.Finally, the existing problems and prospects of the garnet's equation of state studies were also evaluated.
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Key words:
- high-pressure and high-temperature /
- equation of state /
- garnet /
- upper mantle /
- transition zone
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图 7 玄武岩中地幔岩包体(a)、金伯利岩中地幔包体和金刚石包体(b)以及(超)高压变质带榴辉岩(c)中石榴子石的端元组成(涉及的参考文献:[52-55](玄武岩包体)、[56-59](金伯利岩和金刚石包体)、[60-63]((超)高压变质带榴辉岩))
Figure 7. Composition of garnets from the mantle-derived basalt xenolith (a), kimberlite and diamond xenolith (b) and (ultra) high pressure metamorphic (UHPM) eclogite (c)(Corresponding reference:[52-55](mantle-derived basalt xenolith), [56-59](kimberlite and diamond xenolith), [60-63]((ultra) high pressure metamorphic eclogite).)
表 1 常温高压条件下不同组分石榴子石的弹性参数
Table 1. Elastic parameters of garnets with different chemical compositions at room temperature and high pressure
Sample Composition V0/nm3 K0/GPa K0′ Ref. Natural Prp 175 [19] Natural Prp 1.5093(3) 173.7(32) 4.0a [31] Natural Prp Prp67Alm20Grs11 1.5377(6) 179(3) 4.0a [32] Synthetic Prp Prp100 171(3) 1.8(7) [21] Synthetic Prp Prp100 1.5034(5) 175(1) 4.5(5) [23] Synthetic Prp Prp100 175a 3.3(10) [24] Synthetic Prp Prp100 1.5029(3) 171(2) 4.4(2) [25] Synthetic Prp Prp100 1.50615(16) 163.7(17) 6.4(4) [28] Synthetic Prp Prp100 1.5027 190(6) 5.45a [18] Synthetic Alm Alm100 175(7) 1.5(16) [21] Synthetic Alm Alm100 1.5286 185(3) 4.2(3) [25] Synthetic Alm Alm100 1.53352(1) 172.6(15) 5.8(5) [28] Synthetic Alm Alm100 1.5336 168(5) 5.45a [18] Natural Prp-Alm Prp60Alm31 1.5292 177(6) 5.45a [18] Natural Prp-Alm Prp22Alm72 1.5300 173(6) 5.45a [18] Synthetic Prp-Alm Prp83Alm17 1.511(1) 172(4) 4.3a [27] Synthetic Prp-Alm Prp54Alm46 1.515(2) 174(2) 4.3a [27] Synthetic Prp-Alm Prp30Alm70 1.526(1) 183(2) 4.3a [27] Synthetic Prp-Alm Prp60Alm40 1.51632(13) 167.2(17) 5.6(5) [28] Natural Spe Spe93 1.5730 171(1) 5.4(2) [33] Synthetic Spe Spe100 171.8a 7.4 (10) [24] Synthetic Spe Spe100 1.5636 183(4) 5.1(6) [25] Natural Grs Grs90 1.6644 173(2) 4.25a [20] Natural Grs Grs97 1.6623 175(4) 4.25a [20] Synthetic Grs Grs100 168(25) 6.2(4) [29] Synthetic Grs Grs100 1.6602 170(4) 5.2(6) [25] Natural And And100 1.7476(5) 159(2) 4.0a [32] Synthetic And And100 1.7513 162(5) 4.4(7) [25] Natural Grs-And Grs14And84 1.6848(3) 166(2) 4.0a [26] Natural Grs-And Grs34And64 1.6909(4) 168(3) 4.0a [26] Natural Grs-And Grs63And34 1.6992(5) 173(2) 4.0a [26] Natural Uva Uva62Grs35 1.6975 160(1) 5.8(1) [33] Synthetic Uva Uva100 162a 4.7(7) [24] Synthetic Kat Kat100 66(4) 4.1(5) [29] Synthetic Maj Maj100 1.5131 161.2 4.0a [30] Synthetic Maj 1.5470(3) 164.8(34) 4.0a [31] Synthetic My-Na Maj 1.5054(2) 175.1(13) 4.0a [31] Synthetic Na-Maj 1.4855(3) 191.5(25) 4.0a [31] Synthetic Ca-Maj 1.5246(5) 169.3(34) 4.0a [31] Note: The superscript “a” represents the value was fixed in the equation of state fitting.Prp, Alm, Spe, Grs, And, Uva, Kat, and Maj stand for pyrope, almandine, spessartine, grossular, andradite, uvarovite, katoite, and majorite, respectively. 表 2 高温高压下不同组分石榴子石的热弹性参数
Table 2. Thermoelastic parameters of garnets with different chemical compositions at high temperature and high pressure
Sample Composition V0/nm3 K0/GPa K0′ (∂K/∂T)p/
(GPa·K-1)α0/
(10-5K-1)Ref. Synthetic Prp Prp100 1.5031(5) 170(2) 5.0a -0.020(3) 2.30(20) [34] Synthetic Prp Prp100 1.5007(19) 164(9) 4.9(12) -0.024(13) 2.97(45) [35] Synthetic Alm Alm100 1.53105(7) 179(3) 4.0a -0.043(14) 2.60(50) [39] Natural Alm Alm86Prp7Spe7 1.5396(9) 177(2) 4.0a -0.032(16) 3.10(70) [41] Synthetic Spe Spe100 1.56496a 171(4) 5.3(8) -0.049(7) 2.46(54) [37] Natural Spe-Alm Spe38Alm62 1.5446(6) 180(4) 4.0(4) -0.028(5) 3.16(14) [42] Natural Spe-Alm Spe64Alm36 1.5577(9) 176(4) 4.0(5) -0.029(5) 3.04(16) [42] Synthetic Grs Grs100 1.6630(10) 159.7(4.0) 5.10(48) -0.021(2) 2.77(24) [36] Natural Grs Grs97Alm3 1.66608a 168.2(1.7) 4.0a -0.016(3) 2.78(2) [40] Natural And And99 1.75405a 158.0(1.5) 4.0a -0.020(3) 3.16(2) [40] Synthetic Grs-And Grs50And50 1.7069(2) 164(2) 4.7(2) -0.018(2) 2.94(7) [44] Synthetic Prp-Grs Prp80Grs20 1.5394(2) 159.1(2) 4.4a 2.382(11) [45] Synthetic Prp-Grs Prp60Grs40 1.5784(2) 161.8(1) 4.4a 2.425(4) [45] Synthetic Prp-Grs Prp40Grs60 1.6120(2) 160.7(1) 4.4a 2.258(1) [45] Synthetic Prp-Grs Prp20Grs80 1.6384(2) 158.3(1) 4.4a 2.129(33) [45] Synthetic Uva Uva100 1.7368(8) 162(3) 4.3(4) -0.021(4) 2.72(14) [43] Synthetic hydrous Prp Prp100 1.5054(3) 162(1) 4.9(2) -0.018(4) 3.20(10) [46] Synthetic Na-Maj Na-Maj 1.47588 184(4) 3.8(6) -0.023(5) 3.22(20) [38] Note: The superscript “a” represents the value was fixed in the equation of state fitting. -
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