Applicability of Geothermometer to Granitic Mylonites in Nabu Ductile Shear Zone, Southeast Guangxi
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摘要: 糜棱岩的变质变形温度测定对其变形演化过程和热年代学同位素定年结果解释具有重要的意义.本文仅讨论各地质温度计在那卜韧性剪切带中的适用性.利用糜棱岩中的矿物组合、矿物动态重结晶特征以及EBSD（electron back-scattered diffraction）石英 < c > 轴组构等塑性变形特征，估算出那卜韧性剪切带的变质变形温度范围为400~550 ℃.在电子探针分析技术基础上，利用绿泥石成分地质温度计、白云母-绿泥石地质温度计以及白云母/黑云母Ti温度计对那卜韧性剪切带中的花岗质糜棱岩样品进行变质变形温度计算，获得相应的温度分别为305~325 ℃、390~500 ℃、395~492 ℃和473~565 ℃、431~574 ℃.通过对比分析发现，利用绿泥石成分地质温度计获得的结果明显低于利用塑性变形特征估算出的温度范围和其他温度计的计算结果，结合前人研究结果表明其仅适用于低温变质变形作用的温度计算；而另外3种温度计获得的结果在误差范围内均位于利用塑性变形特征估算出的温度范围内，表明其均适用于该剪切带的变质变形温度计算.其中白云母-绿泥石地质温度计适用于低温糜棱岩，白云母/黑云母Ti温度计适用于相对高温的糜棱岩.Abstract: The measurement of metamorphic and deformation temperature of mylonites is of great significance for the interpretation of deformation evolution process and thermochronological isotope dating results. In this paper it only discusses the applicability of each geothermometers in the Nabu ductile shear zone. Using the plastic deformation characteristics, such as the mineral assemblage, dynamic recrystallization characteristics of minerals and EBSD (electron back-scattered diffraction) quartz c-axis fabrics in mylonites, the metamorphic deformation temperature range of the Nabu ductile shear zone is estimated to be 400 to 550 ℃. Based on the electron probe microanalysis (EMPA), the chlorite compositional geothermometer, muscovite-chlorite geothermometer, Ti-in-muscovite and Ti-in-biotite geothermometers were applied to calculate the metamorphic deformation temperature of the granitic mylonite samples in the Nabu ductile shear zone. The corresponding temperatures are 305 to 325 ℃, 390 to 500 ℃, 395 to 492 ℃ and 473 to 565 ℃, 431 to 574 ℃. Through comparative analysis, it is found that the results obtained by using chlorite compositional geothermometer are obviously lower than the temperature range estimated by using plastic deformation characteristics and the results calculated by other geothermometers. Combined with the results of previous studies, the chlorite compositional geothermometer is only suitable for the temperature calculation of low temperature metamorphic deformation. The results obtained by the other three geothermometers are all within the error range of the temperature estimated by using the plastic deformation characteristics, indicating that they are suitable for the calculation of metamorphic deformation temperature of the Nabu ductile shear zone. Among them, the muscovite-chlorite geothermometer is suitable for low temperature mylonite, and Ti-in-muscovite and Ti-in-biotite geothermometers are suitable for relatively high temperature mylonite.
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Key words:
- mylonitization /
- ductile shear zone /
- geothermometer /
- metamorphic deformation temperature /
- Nabu Town /
- tectonics
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图 1 桂东南地区大地构造位置简图(a)和那卜韧性剪切带区域地质图及采样位置(b)
1.第四系桂平组；2.古近系邕宁群；3.白垩系罗文组；4.白垩系新隆组；5.泥盆系信都组；6.志留系连滩组；7.奥陶系兰瓮组；8.中（新）元古界天堂山群；9.新元古界云开群；10.白垩纪细-中（粗中）粒斑状黑云二长花岗岩；11.三叠纪中-中粗粒斑状堇青黑云二长花岗岩；12.泥盆纪片麻状细粒二长花岗岩；13.志留纪片麻眼球状中细粒黑云二长花岗岩；14.志留纪片麻状中细粒黑云二长花岗岩；15.志留纪中细粒堇青花岗闪长岩；16.新元古代花岗岩；17.韧性剪切带；18.大断裂；19.小断裂；20.采样位置；21.城镇；图a底图据毛景文等（2011）；图b底图据赵国英（2017）
Fig. 1. Simplified geological sketch map of tectonic position in Southeast Guangxi, southern China (a) and simplified geological map and sampling location of Nabu ductile shear zone (b)
图 2 那卜韧性剪切带糜棱面理赤平投影图
a.极点图；b.立体示意图
Fig. 2. Stereographic projection in the Nabu ductile shear zone
图 3 那卜韧性剪切带野外地质特征
a.糜棱面理上的“σ”型长石碎斑，指示右行剪切；b.塑性拉长的眼球状长石碎斑，指示右行剪切；c.糜棱面理上的拉伸线理，指示具逆冲性质的剪切运动；d.糜棱面理上的S-C组构，指示右行剪切
Fig. 3. Geological features of the Nabu ductile shear zone
图 4 那卜韧性剪切带糜棱岩显微照片
a.长石碎斑，具有卡式双晶现象；b，c.石英呈条带状，分布于长石碎斑的两侧或拖尾端，指示右行剪切；d.糜棱面理上的S-C组构，指示右行剪切；e.沿糜棱面理发育的细粒共生白云母和绿泥石；f，g，h.石英颗粒边界呈花边状或孤岛状，指示颗粒边界迁移重结晶作用；i.“σ”型石英碎斑
Fig. 4. Photomicrographs of mylonites from the Nabu ductile shear zone
图 5 那卜韧性剪切带中糜棱岩石英 < c > 轴组构图
薄片垂直面理平行线理切制；下半球等面积投影；极点图中密度单位%
Fig. 5. The quartz c-axis pole plots of mylonites from the Nabu ductile shear zone
图 7 绿泥石Si-Fe分类图解(a)、绿泥石Al+□-Mg-Fe分类图解(b)和绿泥石R2+-Si分类图解(c)
图a底图据Deer et al.（1962）；图b底图据Zane and Weiss（1998）；图c底图据Wiewióra and Weiss（1990）
Fig. 7. Illustration of Si-Fe classification of chlorite (a), illustration of Al+□-Mg-Fe ternary of chlorite (b) and illustration of R2+-Si classification of chlorite (c)
图 8 那卜韧性剪切带花岗质糜棱岩白云母成分图
底图据Massonne and Schreyer（1987）
Fig. 8. Muscovite chemical compositions plotted in the granitic mylonites from the Nabu ductile shear zone
图 9 那卜韧性剪切带花岗质糜棱岩中原生白云母和次生白云母判别图
Fig. 9. Muscovite chemical compositions plotted in the ternary Mg-Ti-Na diagram of granitic mylonites from the Nabu ductile shear zone
图 10 那卜花岗质糜棱岩黑云母分类图(a)和黑云母10×TiO2-FeO*-MgO分类图(b)
图a底图据Foster（1960）；图b底图据Nachit et al.（2005）
Fig. 10. Biotite classification diagram (a) and biotite ternary 10×TiO2-FeO*-MgO diagram (b)
图 11 共存的白云母-绿泥石Al分配等温线图(a)和形成温度直方图(b)
图a底图据Kotov（1975）
Fig. 11. Isothermal line of Al partition between coexisting muscovite and chlorite (a) and distribution histogram of formation temperature (b)
图 12 不同地质温度计计算结果统计
Fig. 12. Statistical chart of the calculation results of different geothermometers
表 1 那卜韧性剪切带糜棱岩特征及估算温度
Table 1. Characters and temperature estimation of mylonites in Nabu ductile shear zone
样品号 采样地点 基质矿物组合 残斑矿物组合 长石变形特征 石英变形特征 估算温度 G22 N: 21°50′20.69″
E: 109°46′22.91″Qtz+Ms+Chl+Bt+Kfs Qtz+Ms+Bt+Kfs 显微破裂+塑性拉长 亚颗粒旋转+颗粒边界迁移 400~550 ℃ G23 N: 21°50′55.56″
E: 109°55′34.38″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 颗粒边界迁移 400~550 ℃ G24 N: 21°57′29.72″
E: 110°01′55.52″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 颗粒边界迁移 400~550 ℃ G25 N: 21°58′10.61″
E: 110°02′50.87″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 颗粒边界迁移 400~550 ℃ G27 N: 21°52′24.05″
E: 109°53′02.01″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 颗粒边界迁移 400~550 ℃ G29 N: 21°51′54.71″
E: 109°50′30.60″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 亚颗粒旋转+颗粒边界迁移 400~550 ℃ G30 N: 21°52′19.61″
E: 109°51′00.79″Qtz+Ms+Bt+Kfs Qtz+Ms+Bt+Kfs 显微破裂+塑性拉长 亚颗粒旋转+颗粒边界迁移 400~550 ℃ G31 N: 21°52′22.16″
E: 109°51′13.86″Qtz+Ms+Bt+Pl Qtz+Ms+Bt+Pl 显微破裂+塑性拉长 亚颗粒旋转+颗粒边界迁移 400~550 ℃ 注：Qtz.石英；Ms.白云母；Chl.绿泥石；Bt.黑云母；Kfs.钾长石；Pl.斜长石. 
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表 2 糜棱岩中共生白云母和绿泥石电子探针分析及温度计算结果
Table 2. Electron microprobe analysis and temperature calculation results of coexisting muscovite and chlorite in mylonite
样品号 矿物 SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O Total Si AlⅣ AlⅥ Ti Fetotal Mn Mg Ca Na K TC88 TJ91 KT75 P96 WMT15 G22-DX1 白云母 49.65 0.19 30.33 2.28 0.06 2.48 0.01 0.16 11.32 96.48 3.29 0.71 1.65 0.01 0.13 0.00 0.24 0.00 0.02 0.96 400 0.66 406 绿泥石 26.56 0.00 19.93 22.82 0.88 16.26 0.00 0.01 0.01 86.46 2.81 1.19 1.29 0.00 2.02 0.08 2.56 0.00 0.00 0.00 322 325 白云母 48.68 0.34 32.05 2.33 0.06 2.06 0.00 0.23 11.21 96.97 3.21 0.79 1.70 0.02 0.13 0.00 0.20 0.00 0.03 0.94 420 0.54 472 绿泥石 27.16 0.03 19.37 23.27 0.96 16.44 0.01 0.00 0.03 87.27 2.85 1.15 1.25 0.00 2.04 0.09 2.57 0.00 0.00 0.00 308 312 白云母 48.84 0.25 31.68 2.57 0.11 2.09 0.00 0.21 11.10 96.85 3.22 0.78 1.69 0.01 0.14 0.01 0.21 0.00 0.03 0.93 410 0.52 427 绿泥石 26.92 0.02 19.72 22.95 0.94 16.46 0.01 0.02 0.00 87.06 2.83 1.17 1.27 0.00 2.02 0.08 2.58 0.00 0.00 0.00 316 319 白云母 48.28 0.36 31.64 2.25 0.05 1.99 0.01 0.22 11.12 95.92 3.21 0.79 1.70 0.02 0.13 0.00 0.20 0.00 0.03 0.94 410 0.57 482 绿泥石 26.93 0.00 19.85 22.92 0.84 16.32 0.00 0.00 0.01 86.87 2.83 1.17 1.29 0.00 2.02 0.07 2.56 0.00 0.00 0.00 314 318 白云母 49.49 0.33 30.76 2.34 0.07 2.57 0.00 0.19 11.19 96.94 3.26 0.74 1.65 0.02 0.13 0.00 0.25 0.00 0.02 0.94 390 0.68 474 绿泥石 26.81 0.06 19.66 22.93 0.92 16.46 0.02 0.02 0.01 86.88 2.82 1.18 1.26 0.00 2.02 0.08 2.58 0.00 0.00 0.00 317 321 白云母 49.18 0.31 30.88 2.53 0.12 2.31 0.10 0.20 10.88 96.51 3.25 0.75 1.66 0.02 0.14 0.01 0.23 0.01 0.03 0.92 400 0.65 462 绿泥石 27.47 0.04 19.33 23.43 0.95 16.66 0.00 0.00 0.01 87.88 2.86 1.14 1.23 0.00 2.04 0.08 2.59 0.00 0.00 0.00 305 308 白云母 48.97 0.29 31.06 2.10 0.09 2.35 0.03 0.21 11.25 96.34 3.24 0.76 1.67 0.01 0.12 0.01 0.23 0.00 0.03 0.95 410 0.62 456 绿泥石 26.99 0.04 19.74 23.36 0.98 16.35 0.02 0.03 0.02 87.51 2.83 1.17 1.26 0.00 2.05 0.09 2.55 0.00 0.01 0.00 316 320 G22-DX2 白云母 48.50 0.20 32.05 2.00 0.00 2.05 0.00 0.26 11.23 96.29 3.21 0.79 1.71 0.01 0.11 0.00 0.20 0.00 0.03 0.95 450 0.47 406 绿泥石 26.82 0.00 19.59 24.37 1.27 15.75 0.02 0.04 0.03 87.89 2.82 1.18 1.24 0.00 2.14 0.11 2.47 0.00 0.01 0.00 319 323 白云母 48.98 0.19 31.93 2.19 0.06 2.15 0.02 0.19 11.24 96.94 3.22 0.78 1.70 0.01 0.12 0.00 0.21 0.00 0.02 0.94 410 0.49 400 绿泥石 27.35 0.00 19.88 22.90 0.98 16.42 0.00 0.02 0.02 87.58 2.85 1.15 1.29 0.00 2.00 0.09 2.55 0.00 0.00 0.00 308 312 白云母 48.75 0.28 32.22 1.88 0.06 1.90 0.01 0.22 11.17 96.49 3.22 0.78 1.72 0.01 0.10 0.00 0.19 0.00 0.03 0.94 490 0.53 446 绿泥石 27.34 0.03 19.69 22.61 1.05 16.97 0.00 0.04 0.04 87.78 2.84 1.16 1.25 0.00 1.97 0.09 2.63 0.00 0.01 0.01 311 314 白云母 48.96 0.38 32.09 1.98 0.05 2.06 0.01 0.24 11.25 97.02 3.22 0.78 1.70 0.02 0.11 0.00 0.20 0.00 0.03 0.94 430 0.59 492 绿泥石 27.71 0.15 20.33 22.04 0.93 16.86 0.03 0.13 0.08 88.26 2.85 1.15 1.31 0.01 1.90 0.08 2.58 0.00 0.03 0.01 309 312 白云母 47.56 0.10 33.03 1.76 0.04 1.55 0.00 0.23 11.39 95.65 3.17 0.83 1.77 0.01 0.10 0.00 0.15 0.00 0.03 0.97 500 0.35 400 绿泥石 27.07 0.01 20.06 23.70 1.00 16.02 0.01 0.02 0.02 87.91 2.82 1.18 1.29 0.00 2.07 0.09 2.49 0.00 0.00 0.00 317 321 白云母 48.43 0.26 32.47 2.17 0.06 1.94 0.01 0.24 11.22 96.78 3.19 0.81 1.72 0.01 0.12 0.00 0.19 0.00 0.03 0.94 400 0.45 432 绿泥石 27.50 0.08 20.50 22.98 1.12 15.89 0.02 0.02 0.09 88.19 2.85 1.15 1.35 0.01 1.99 0.10 2.45 0.00 0.00 0.01 310 314 白云母 49.39 0.18 32.21 1.86 0.09 2.07 0.05 0.17 11.36 97.38 3.23 0.77 1.71 0.01 0.10 0.00 0.20 0.00 0.02 0.95 420 0.51 395 绿泥石 27.49 0.06 19.63 22.92 0.93 16.64 0.10 0.07 0.03 87.88 2.86 1.14 1.26 0.00 1.99 0.08 2.58 0.01 0.01 0.00 306 310 注：表中矿物成分以氧化物百分数(%)和原子数(a.p.f.u)表示.TC88为利用Cathelineau (1988)的绿泥石温度计求得的温度值(℃); TJ91为利用Jowett (1991)的绿泥石温度计求得的温度值(℃); KT75为利用Kotov (1975)白云母-绿泥石地质温度计求得的温度值(℃); P96为利用Anderson (1996)的白云母压力计求得的压力值(GPa); WMT15为利用Wu and Chen (2015b)的白云母Ti温度计求得的温度值(℃).
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表 3 糜棱岩中共生白云母和黑云母电子探针分析及温度计算结果
Table 3. Electron microprobe analysis and temperature calculation results of coexisting muscovite and biotite in mylonite
样品 G22 G22 G29 G29 G29 G29 G30 G30 G30 G30 G31 G31 G31 G31 矿物 Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j Ms-j 位置 416 90 269 274 279 287 308 319 323 324 346 350 356 375 SiO2 49.07 49.78 49.35 46.56 48.89 48.33 48.70 48.84 49.52 46.67 49.49 48.93 49.69 49.09 TiO2 0.42 0.34 0.35 0.49 0.45 0.46 0.63 0.50 0.43 0.51 0.37 0.38 0.47 0.37 Al2O3 31.87 31.64 30.90 32.20 31.98 31.56 30.91 31.97 30.67 31.39 31.76 32.71 32.28 33.02 FeO 2.35 2.27 2.91 2.86 2.84 2.99 2.50 2.68 2.53 2.64 2.19 2.01 2.24 2.15 MnO 0.09 0.16 0.04 0.00 0.03 0.06 0.01 0.05 0.05 0.01 0.04 0.04 0.04 0.04 MgO 2.03 2.00 1.89 1.41 1.72 1.56 1.67 1.51 1.84 1.62 1.67 1.56 1.63 1.55 CaO 0.01 0.16 0.00 0.00 0.01 0.07 0.02 0.02 0.06 0.05 0.01 0.00 0.02 0.07 Na2O 0.20 0.25 0.22 0.23 0.21 0.30 0.26 0.27 0.24 0.26 0.20 0.22 0.28 0.36 K2O 11.22 10.97 10.92 10.84 10.81 10.86 10.96 11.01 11.06 10.77 11.18 11.26 11.14 10.87 total 97.24 97.56 96.57 94.58 96.94 96.18 95.66 96.85 96.40 93.93 96.91 97.10 97.79 97.51 Si 3.22 3.25 3.26 3.15 3.22 3.22 3.25 3.22 3.28 3.18 3.25 3.21 3.24 3.20 AlⅣ 0.78 0.75 0.74 0.85 0.78 0.78 0.75 0.78 0.72 0.82 0.75 0.79 0.76 0.80 AlⅥ 1.69 1.69 1.67 1.72 1.70 1.69 1.68 1.71 1.67 1.70 1.71 1.74 1.71 1.74 Ti 0.02 0.02 0.02 0.02 0.02 0.02 0.03 0.02 0.02 0.03 0.02 0.02 0.02 0.02 Fetotal 0.13 0.12 0.16 0.16 0.16 0.16 0.14 0.15 0.14 0.15 0.12 0.11 0.12 0.12 Mn 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Mg 0.20 0.19 0.19 0.14 0.17 0.15 0.17 0.15 0.18 0.16 0.16 0.15 0.16 0.15 Ca 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na 0.03 0.03 0.03 0.03 0.03 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.05 K 0.94 0.91 0.92 0.94 0.91 0.92 0.93 0.93 0.93 0.94 0.94 0.94 0.93 0.90 Mg/(Fe+Mg) 0.61 0.61 0.54 0.47 0.52 0.48 0.54 0.50 0.56 0.52 0.58 0.58 0.56 0.56 P96 0.61 0.66 0.69 0.45 0.61 0.61 0.77 0.64 0.77 0.54 0.68 0.56 0.67 0.54 WMT15 500 473 474 513 505 506 565 521 506 528 485 486 515 479 样品 G22 G22 G29 G29 G29 G29 G30 G30 G30 G30 G31 G31 G31 G31 矿物 Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j Bt-j 位置 95 94 282 285 273 294 301 311 326 312 353 365 354 359 SiO2 39.88 38.95 37.16 36.91 36.61 36.55 36.54 36.73 36.35 36.79 36.71 36.73 36.86 37.06 TiO2 0.80 1.22 1.39 1.49 1.51 1.54 1.41 1.62 1.67 1.76 1.60 1.58 1.43 1.59 Al2O3 17.08 17.38 17.36 17.26 17.33 17.15 17.45 17.71 16.93 16.97 17.14 17.61 17.49 17.68 FeO 16.28 16.94 20.93 21.98 21.90 22.08 21.76 20.64 20.86 21.55 21.61 21.35 22.04 22.00 MnO 0.76 0.63 0.35 0.36 0.41 0.39 0.37 0.31 0.37 0.32 0.38 0.34 0.38 0.37 MgO 11.64 11.09 8.12 8.13 8.35 8.35 8.51 8.66 8.60 8.77 8.49 8.35 8.00 8.31 CaO 0.10 0.06 0.02 0.16 0.01 0.11 0.00 0.02 0.02 0.00 0.00 0.09 0.02 0.00 Na2O 0.10 0.10 0.09 0.07 0.07 0.10 0.09 0.08 0.15 0.09 0.07 0.12 0.08 0.09 K2O 9.75 9.72 9.60 9.24 9.66 9.45 9.71 8.98 9.60 9.67 9.85 9.56 9.75 9.71 total 96.37 96.08 95.02 95.58 95.84 95.72 95.84 94.75 94.53 95.92 95.86 95.71 96.04 96.81 Si 2.94 2.89 2.85 2.83 2.81 2.81 2.80 2.82 2.82 2.81 2.81 2.81 2.82 2.81 AlⅣ 1.06 1.11 1.15 1.17 1.19 1.19 1.20 1.18 1.18 1.19 1.19 1.19 1.18 1.19 AlⅥ 0.43 0.42 0.42 0.39 0.37 0.36 0.38 0.42 0.36 0.34 0.36 0.40 0.40 0.39 Ti 0.04 0.07 0.08 0.09 0.09 0.09 0.08 0.09 0.10 0.10 0.09 0.09 0.08 0.09 Fetotal 1.00 1.05 1.34 1.41 1.40 1.42 1.39 1.32 1.35 1.38 1.39 1.37 1.41 1.39 Mn 0.05 0.04 0.02 0.02 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Mg 1.28 1.23 0.93 0.93 0.95 0.96 0.97 0.99 0.99 1.00 0.97 0.95 0.91 0.94 Ca 0.01 0.01 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 Na 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 K 0.92 0.92 0.94 0.90 0.95 0.93 0.95 0.88 0.95 0.94 0.96 0.93 0.95 0.94 XTi 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.04 0.03 0.03 0.03 0.03 XFe 0.36 0.38 0.48 0.50 0.50 0.50 0.49 0.47 0.48 0.49 0.49 0.49 0.50 0.50 XMg 0.46 0.44 0.33 0.33 0.34 0.34 0.34 0.35 0.35 0.35 0.35 0.34 0.33 0.33 Ps 0.29 0.66 0.69 0.45 0.61 0.61 0.77 0.64 0.77 0.54 0.68 0.56 0.67 0.54 WBT15 431 505 558 542 552 553 553 563 574 556 561 556 558 556 Fe3+ 0.04 0.05 0.07 0.09 0.08 0.09 0.08 0.07 0.08 0.08 0.09 0.08 0.08 0.08 Fe2+ 0.96 1.00 1.27 1.32 1.32 1.33 1.31 1.25 1.27 1.30 1.30 1.29 1.33 1.31 注：表中矿物成分以氧化物百分数(%)和原子数(a.p.f.u)表示.WBT15为利用Wu and Chen (2015a)的黑云母Ti温度计求得的温度值(℃); WMT15为利用Wu and Chen (2015b)的白云母Ti温度计求得的温度值(℃); P96为利用Anderson (1996)的白云母压力计求得的压力值(GPa); Ps基于黑云母共生白云母压力计结果(GPa).
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