浙西南八都杂岩早中生代泥质麻粒岩变质作用及构造意义

董云峰; 郑常青; 周喜文; 徐久磊; 周枭; 王照元; 宋旸; 钟定鼎

doi:10.3799/dqkx.2018.016

浙西南八都杂岩早中生代泥质麻粒岩变质作用及构造意义

doi: 10.3799/dqkx.2018.016

1.
吉林大学地球科学学院, 东北亚矿产资源评价国土资源部重点实验室, 吉林长春 130061
2.
中国地质科学院地质研究所, 北京 100037

基金项目:

中国地质调查局项目 121201102000150020-06

国家自然科学基金项目 41472164

详细信息

作者简介:
董云峰(1988-), 男, 理学硕士, 主要从事变质岩石学和地球化学研究

通讯作者:
郑常青

中图分类号: P588.34
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出版历程
- 收稿日期: 2017-07-20
- 刊出日期: 2018-01-15

Metamorphism and Its Tectonic Implications of Early Mesozoic Pelitic Granulites from Badu Complex of Southwestern Zhejiang Province, South China

1.
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources; College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

摘要

摘要: 遂昌-大柘泥质麻粒岩出露于华夏地块东北部的浙西南八都杂岩中，该岩石保留了典型的减压反应结构.但其变质演化特点、变质作用时代及构造意义目前尚不明确.通过系统的岩相学、矿物化学和同位素年代学分析，结果表明遂昌-大柘泥质麻粒岩记录了4个阶段的变质矿物组合，其中早期进变质阶段M₁的矿物组合为石榴石+黑云母+石英；压力峰期变质阶段M₂的矿物组合为石榴石+铝绿泥石+金红石+蓝晶石+刚玉+黑云母+石英±十字石，该矿物组合可能预示着岩石曾经历了超高压变质作用过程；峰期变质阶段M₃的矿物组合为石榴石+黑云母+夕线石+石英±钾长石±斜长石±钛铁矿；峰后近等温降压M_4-1阶段的矿物组合为石榴石+黑云母+夕线石+堇青石+石英+钛铁矿±尖晶石±斜长石±钾长石；M_4-2阶段的矿物组合为石榴石+堇青石+夕线石+斜长石+黑云母+石英±钾长石.相平衡模拟结合传统地质温压计限定其峰期变质阶段的温压条件为T=780~810 ℃、P=8.0~9.2 kbar；峰期后近等温降压的M_4-1阶段的温压条件为T=780~860 ℃和P=5.7~6.0 kbar，M_4-2阶段的温压条件为T=~700 ℃和P=~4.4 kbar，具有典型的顺时针近等温减压型P-T轨迹特征.LA-ICP-MS U-Pb定年结果表明其麻粒岩相变质作用时代为233.5~238.9 Ma.变质作用历史说明浙西南地体可能卷入了古特提斯洋域内印支-华南-华北板块之间的俯冲-碰撞过程，并经历了早中生代的麻粒岩相变质作用后快速折返至地表.
- 泥质麻粒岩 /
- 岩石学 /
- 相平衡 /
- U-Pb年代学 /
- 早中生代 /
- 八都杂岩 /
- 华夏地块
Abstract: Suichang-Dazhe pelitic granulites, showing distinct decompressional textures, crop out in Badu complex of the southwestern Zhejiang Province, the Cathaysia block. However, its metamorphic evolution characteristics, metamorphism ages and tectonic implications remain unclear. Results of our study of its petrology, mineral chemistry and LA-ICP-MS zircon U-Pb ages indicate that the rocks contain four distinct metamorphic assemblages, namely the early prograde (M₁), pressure peak (M₂), peak (M₃) and the post-peak (M₄) stages. The early prograde (M₁) assemblage consists of garnet (core)+biotite+quartz. The pressure peak (M₂) assemblage consists of garnet (mantle)+sudoite+rutile+kyanite+corundum+biotite+quartz±staurolite, the mineral assemblage may indicate that the rock has undergone the process of ultrahigh pressure metamorphism. The peak (M₃) assemblage consists of garnet (rim-mantle)+biotite+sillimanite+quartz±K-feldspar±plagioclase±ilmenite. Post-peak near-isothermal decompressional (M₄) stage following the peak stage could be subdivided into two stages M_4-1 and M_4-2. The M_4-1 stage assemblage consists of garnet (rim)+cordierite+biotite+sillimanite+quartz+ilmenite±spinel±plagioclase±K-feldspar, and the M_4-2 stage is represented by garnet (rim)+cordierite+sillimanite+plagioclase+biotite+quartz±K-feldspar. Quantitative phase equilibria modeling in the system Na₂O-CaO-K₂O-FeO-MgO-Al₂O₃-SiO₂-H₂O-TiO₂, in combination with traditional thermobarometry, was applied to obtain P-T conditions of 780-810℃ and 8.0-9.2 kbar for M₃, 780-860℃ and 5.7-6.0 kbar for M_4-1, about 700℃ and about 4.4 kbar for M_4-2. The combination of the mineral assemblages, mineral compositions, and metamorphic reaction history in the Suichang-Dazhe pelitic granulite defines a clockwise P-T path that involves near-isothermal decompression that followed the peak granulite-facies metamorphism. Analyses of LA-ICP-MS zircon U-Pb dating indicate that metamorphic zircons recorded metamorphic age of the Suichang-Dazhe pelitic granulite is 233.5-238.9 Ma. The clockwise P-T path reveals that the southwestern Zhejiang Province terrane involved in the subduction or collision followed by exhumation and cooling events and experienced the Early Mesozoic (233.5-238.9 Ma) granulite-facies metamorphism with the amalgamation of the Indochina-South China-North China block in the paleo-Tethyan domain.
- pelitic granulite /
- petrology /
- phase equilibria /
- U-Pb dating /
- Early Mesozoic /
- Badu complex /
- Cathaysia block

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图 1 华南(a)及浙西南地区(b)区域地质简图

图 1据Yu et al.(2012)、Zhao et al.(2014)

Fig. 1. Geological sketch of South China (a) and southwestern Zhejiang Province (b)

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图 2 浙西南遂昌-大柘地区泥质麻粒岩野外露头照片

Fig. 2. Outcrops of pelitic granulite in the Suichang-Dazhe area

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图 3 浙西南遂昌-大柘地区泥质麻粒岩显微照片

a.石榴石变斑晶内包裹板柱状蓝晶石、粒状十字石、铝绿泥石、刚玉、金红石、石英和片状黑云母(SC80-6，PL图像)；b.石榴石变斑晶边部可见明显的堇青石、黑云母后生合晶(SC80-6，PL图像)；c.局部贫硅微域尖晶石、堇青石共生(SC80-7，PL图像)；d.石榴石退变反应结构，边部常见堇青石、黑云母、夕线石、石英、钛铁矿等矿物(SC80-7，CPL图像)；e.基质中片状堇青石和石榴石、黑云母、石英等共生, 堇青石内包裹夕线石微晶(SC80-4，CPL图像)；f.石榴石边部残留的斜长石、堇青石，堇青石多发生绢云母化蚀变(SC80-6，CPL图像)

Fig. 3. Representative photomicrographs images of the pelitic granulite in the Suichang-Dazhe area

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图 4 浙西南遂昌-大柘地区泥质麻粒岩背散射电子图像

a、b.堇青石退变边内包裹细鳞片状黑云母，夕线石、蠕虫状石英、钛铁矿等矿物(SC80-6和SC80-7，SEM图像)；c.基质中条纹长石边部的斜长石和蠕虫状石英(SC80-1，SEM图像)；d.石榴石变斑晶边部分解成鳞片状黑云母和粒状斜长石(SC80-1，SEM图像)

Fig. 4. Back-scattered electron (BSE) images of the pelitic granulite in the Suichang-Dazhe area

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图 5 泥质麻粒岩代表性石榴石成分剖面

Fig. 5. Representative compositional profiles of garnet in the pelitic granulite

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图 6 浙西南遂昌-大柘地区泥质麻粒岩(SC80-6)相平衡模拟结果

图据估算有效全岩成分；a.P-T视剖面图；b.根据石榴石Mg^#(grt)(Mg/(Fe²⁺+Mg))和X_Ca(grt)(Ca/(Ca+Mg+Fe²⁺))成分等值线限定峰期(M₃)阶段温压条件；根据堇青石X_Mg(crd)(Mg/(Mg+Fe²⁺))和石榴石的Mg^#(grt)成分等值线限定峰后减压阶段(M_4-1和M_4-2)的温压条件，各阶段均用彩色区域表示，得到近等温减压型顺时针P-T轨迹

Fig. 6. The result of phase equilibria modeling for pelitic granulite of the Suichang-Dazhe area

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图 7 泥质麻粒岩中锆石的阴极发光图像和LA-ICP-MS定年结果

Fig. 7. Cathodoluminescent (CL) images and LA-ICP-MS U-Pb ages of zircons from the pelitic granulite from Suichang-Dazhe area

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图 8 泥质麻粒岩锆石球粒陨石标准化稀土元素配分模式

图据Sun and McDonough(1989)

Fig. 8. REE patterns of zircons from the pelitic granulite

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图 9 遂昌-大柘泥质麻粒岩中锆石U-Pb年龄结果

Fig. 9. Zircon U-Pb dating results for pelitic granulite from the Suichang-Dazhe area

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图 10 浙西南八都杂岩高级变质岩的P-T演化轨迹

1.含石榴角闪岩，据Wang et al.(2012)；2.变质成因紫苏花岗岩，据Yang et al.(2016)；3.泥质麻粒岩，据赵磊和周喜文(2012)；4.石榴二辉石麻粒岩，据赵磊(2012)；5.石榴角闪斜长片麻岩，据赵磊(2012)；6.泥质麻粒岩；变质反应线，据张翠光和魏春景(2004)

Fig. 10. P-T paths of high-grade metamorphic rocks from the Badu complex of the southwestern Zhejiang Province

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附表 1 泥质麻粒岩中石榴石变斑晶的化学成分(SC80-6)(%)

附表 1. Representative compositions of garnet in the pelitic granulite (%)

Ps.	1	2	3	4	5	6	7	8	9	10	11	12	13
	rim			←			core			→			rim
SiO₂	37.25	37.34	37.76	37.37	37.67	37.94	37.49	37.47	37.88	37.57	37.16	37.33	36.83
TiO₂	0.01	0.00	0.04	0.00	0.00	0.02	0.02	0.03	0.05	0.00	0.04	0.02	0.02
Al₂O₃	21.08	20.98	21.30	21.12	21.46	21.13	21.05	21.33	21.56	21.59	20.89	20.97	20.93
FeO^T	34.99	33.72	32.77	33.08	32.88	32.75	32.43	32.77	32.65	32.90	33.08	33.90	35.30
MnO	1.04	0.78	0.66	0.70	0.66	0.60	0.61	0.60	0.58	0.66	0.70	0.88	1.23
MgO	3.78	5.36	5.75	5.63	6.01	5.86	5.82	6.29	6.33	6.02	5.55	4.63	3.48
CaO	1.45	1.28	1.15	1.24	1.45	1.40	1.37	1.25	1.17	1.21	1.38	1.42	1.72
Na₂O	0.03	0.00	0.00	0.03	0.00	0.02	0.02	0.03	0.02	0.01	0.04	0.04	0.00
K₂O	0.02	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.03	0.02	0.01
Cr₂O₃	0.00	0.00	0.00	0.05	0.06	0.00	0.02	0.04	0.00	0.00	0.00	0.06	0.00
Total	99.66	99.48	99.42	99.22	100.20	99.71	98.85	99.80	100.24	99.96	98.87	99.25	99.51
基于12个氧原子计算的阳离子数
Si	2.99	2.98	3.00	2.98	2.97	3.00	2.99	2.96	2.97	2.96	2.97	2.99	2.97
Ti	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Al	2.00	1.97	2.00	1.98	1.99	1.97	1.98	1.98	2.00	2.01	1.97	1.98	1.99
Fe²⁺	2.34	2.18	2.18	2.15	2.10	2.15	2.14	2.07	2.10	2.11	2.14	2.25	2.33
Fe³⁺	0.02	0.07	0.00	0.06	0.07	0.02	0.03	0.10	0.05	0.06	0.08	0.03	0.06
Mn	0.07	0.05	0.04	0.05	0.04	0.04	0.04	0.04	0.04	0.04	0.05	0.06	0.08
Mg	0.45	0.64	0.68	0.67	0.71	0.69	0.69	0.74	0.74	0.71	0.66	0.55	0.42
Ca	0.12	0.11	0.10	0.11	0.12	0.12	0.12	0.11	0.10	0.10	0.12	0.12	0.15
Na	0.00	0.00	0.00	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.01	0.00
K	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Cr	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
Total	8.00	8.01	8.00	8.01	8.01	8.00	8.00	8.01	8.00	8.01	8.01	8.00	8.01
Alm	0.783	0.732	0.726	0.723	0.707	0.717	0.715	0.701	0.705	0.712	0.721	0.753	0.781
Prp	0.152	0.214	0.227	0.225	0.237	0.230	0.232	0.250	0.249	0.239	0.223	0.185	0.140
Sps	0.024	0.018	0.015	0.016	0.015	0.013	0.014	0.014	0.013	0.015	0.016	0.020	0.028
Grs	0.042	0.037	0.032	0.036	0.041	0.039	0.039	0.036	0.033	0.034	0.040	0.041	0.050
Mg^#	0.163	0.226	0.238	0.237	0.251	0.243	0.244	0.263	0.261	0.251	0.236	0.198	0.152
X_Ca	0.043	0.037	0.033	0.036	0.042	0.040	0.040	0.036	0.033	0.035	0.041	0.042	0.051
注：FeO^T=FeO+Fe₂O₃；Mg^#=Mg/(Fe²⁺+Mg)；X_Ca=Ca/(Fe²⁺+Mg+Ca).

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附表 2 泥质麻粒岩中黑云母的化学成分(SC80-6)(%)

附表 2. Representative compositions of biotites in the pelitic granulite (%)

样品号	SC80-6
点位	BI(Grt)	B(Grt)	B(Grt)	BM	BM	BI(Crd)
SiO₂	35.77	34.51	34.81	34.45	35.65	35.79
TiO₂	3.63	3.77	4.73	3.89	4.04	4.17
Al₂O₃	17.48	18.12	17.18	18.62	18.29	17.88
FeOT	15.05	19.25	19.12	19.38	17.56	18.48
MnO	0.00	0.00	0.02	0.06	0.06	0.07
MgO	11.86	8.71	8.63	9.56	9.75	9.73
CaO	0.00	0.00	0.02	0.02	0.03	0.00
Na₂O	0.25	0.23	0.22	0.20	0.28	0.23
K₂O	10.07	9.86	9.94	8.65	9.68	9.74
Cr₂O₃	0.17	0.14	0.13	0.09	0.06	0.16
Total	94.28	94.60	94.80	94.91	95.38	96.25
基于11个氧原子计算的阳离子数
Si	2.713	2.664	2.683	2.631	2.694	2.694
Ti	0.207	0.219	0.274	0.223	0.230	0.236
Al	1.563	1.649	1.561	1.677	1.630	1.587
Cr	0.010	0.009	0.008	0.005	0.004	0.010
Fe³⁺	0.000	0.000	0.000	0.000	0.000	0.000
Fe²⁺	0.955	1.243	1.233	1.238	1.110	1.164
Mn	0.000	0.000	0.001	0.004	0.004	0.004
Mg	1.341	1.002	0.991	1.088	1.098	1.092
Ca	0.000	0.000	0.002	0.002	0.002	0.000
Na	0.037	0.034	0.033	0.030	0.041	0.034
K	0.974	0.971	0.977	0.843	0.933	0.936
Total	7.800	7.792	7.764	7.741	7.747	7.756
X_Mg	0.584	0.446	0.446	0.468	0.497	0.484
Fe²⁺/(Fe²⁺+Mg)	0.416	0.554	0.554	0.532	0.503	0.516
注：FeO^T=FeO+Fe₂O₃；X_Mg=Mg/(Fe²⁺+Mg)；BI(Grt).包裹于石榴石中的黑云母；B(Grt).石榴石边部的黑云母；BM.基质中的黑云母；BI(Crd).包裹于堇青石中的黑云母.

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附表 3 泥质麻粒岩中长石的化学成分(SC80-6)(%)

附表 3. Representative compositions of feldspars in the pelitic granulite (%)

样品号	SC80-6
点位	P(Grt)	P(Grt)	MP	MP	MK	MP(Kf)	MK(Pl)	MP(Pth)	MK(Pth)
SiO₂	58.90	60.59	58.25	60.05	64.36	60.61	64.56	68.51	63.90
TiO₂	0.00	0.00	0.01	0.01	0.00	0.00	0.03	0.01	0.11
Al₂O₃	25.17	25.53	25.53	25.02	18.65	24.77	18.99	19.85	18.96
FeO^T	0.22	0.06	0.02	0.00	0.00	0.03	0.01	0.01	0.00
MnO	0.00	0.03	0.00	0.01	0.00	0.00	0.00	0.03	0.04
MgO	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
CaO	6.65	6.53	8.07	6.20	0.12	5.95	0.09	0.24	0.04
Na₂O	8.00	8.27	7.38	8.32	0.87	8.45	2.21	11.64	1.39
K₂O	0.18	0.23	0.17	0.26	16.24	0.19	14.03	0.69	15.62
Cr₂O₃	0.24	0.00	0.00	0.00	0.00	0.04	0.02	0.00	0.04
Total	99.37	101.24	99.43	99.86	100.24	100.05	99.95	100.98	100.10
基于8个氧原子计算的阳离子数
Si	2.655	2.670	2.639	2.681	2.976	2.698	2.970	2.977	2.961
Al	1.337	1.326	1.363	1.316	1.016	1.299	1.030	1.017	1.035
Ca	0.321	0.308	0.392	0.296	0.006	0.284	0.005	0.011	0.002
Na	0.699	0.707	0.648	0.720	0.078	0.729	0.197	0.981	0.124
K	0.011	0.013	0.010	0.015	0.958	0.011	0.823	0.038	0.923
Total	5.031	5.026	5.052	5.028	5.034	5.022	5.025	5.024	5.046
An	31.143	29.991	37.333	28.752	0.570	27.741	0.447	1.098	0.175
Ab	67.836	68.756	61.758	69.829	7.480	71.221	19.250	95.216	11.861
Or	1.021	1.253	0.909	1.420	91.950	1.037	80.303	3.686	87.964
注：FeO^T=FeO+Fe₂O₃；P(Grt).石榴石边部斜长石；MP.基质中的斜长石；MK.基质中的钾长石；MP(Kf).基质中钾长石边部的斜长石；MK(Pl).基质中斜长石边部的钾长石；MP(Pth).基质条纹长石内的斜长石客晶；MK(Pth).基质条纹长石内的钾长石主晶.

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附表 4 泥质麻粒岩中堇青石和尖晶石的化学成分(SC80-6)(%)

附表 4. Representative compositions of cordierite and spinel in the pelitic granulite (%)

样品号	SC80-6
矿物	Crd					Spl
点位	C(Grt)	C(Grt)	C(Grt)	CM	C(Grt)NSpl	SI(Crd)	SI(Crd)	SI(Crd)	SI(Crd)
SiO₂	47.46	48.77	48.09	47.30	49.39	0.05	0.00	0.02	0.02
TiO₂	0.00	0.00	0.00	0.00	0.02	0.01	0.05	0.03	0.00
Al₂O₃	32.98	32.43	33.23	31.96	33.30	58.05	58.82	59.08	58.62
FeO^T	8.94	8.56	8.41	8.86	7.44	28.65	28.06	28.23	28.25
MnO	0.11	0.12	0.06	0.07	0.02	0.05	0.06	0.07	0.04
MgO	7.69	8.06	7.99	7.94	8.60	3.60	3.82	3.85	3.58
CaO	0.00	0.00	0.03	0.02	0.07	0.00	0.00	0.00	0.00
Na₂O	0.15	0.13	0.17	0.18	0.24	0.23	0.23	0.22	0.29
K₂O	0.03	0.00	0.00	0.02	0.03	0.02	0.00	0.04	0.03
ZnO	0.00	0.09	0.00	0.00	0.05	7.63	7.46	7.58	7.83
Cr₂O₃	0.00	0.00	0.00	0.03	0.00	0.85	0.80	0.50	0.82
NiO	0.00	0.00	0.00	0.00	0.07	0.10	0.04	0.04	0.01
Total	97.34	98.14	97.97	96.37	99.23	99.23	99.34	99.67	99.52
基于18个氧原子计算的阳离子数						基于4个氧原子计算的阳离子数
Si	4.939	5.036	4.961	4.969	5.017	0.001	0.000	0.001	0.001
Ti	0.000	0.000	0.000	0.000	0.002	0.000	0.001	0.001	0.000
Al	4.046	3.948	4.042	3.959	3.988	1.961	1.977	1.978	1.971
Fe²⁺	0.668	0.733	0.656	0.639	0.605	0.659	0.655	0.651	0.649
Fe³⁺	0.110	0.006	0.069	0.139	0.027	0.030	0.015	0.022	0.027
Mn	0.010	0.010	0.005	0.006	0.002	0.001	0.002	0.002	0.001
Mg	1.193	1.240	1.229	1.243	1.302	0.154	0.162	0.163	0.152
Ca	0.000	0.000	0.003	0.002	0.008	0.000	0.000	0.000	0.000
Na	0.030	0.026	0.034	0.037	0.047	0.013	0.012	0.012	0.016
K	0.004	0.000	0.000	0.003	0.004	0.001	0.000	0.001	0.001
Zn	0.000	0.000	0.000	0.000	0.000	0.161	0.157	0.159	0.165
Cr	0.000	0.000	0.000	0.002	0.000	0.019	0.018	0.011	0.018
Ni	0.000	0.000	0.000	0.000	0.000	0.002	0.001	0.001	0.000
Total	11.000	11.000	11.000	11.000	11.000	3.003	3.001	3.002	3.002
X_Mg	0.641	0.628	0.652	0.660	0.683	0.189	0.199	0.200	0.190
注：FeO^T=FeO+Fe₂O₃；X_Mg=Mg/(Fe²⁺+Mg)；C(Grt).石榴石边部的堇青石后生合晶；CM.基质中的堇青石；C(Grt)NSpl.石榴石边部的堇青石与尖晶石直接接触；SI(Crd).堇青石内的尖晶石.

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附表 5 泥质麻粒岩中十字石和铝绿泥石化学成分(SC80-6)(%)

附表 5. Representative compositions of staurolite and Sudoite in the pelitic granulite (%)

样品号	SC80-6
矿物名	St				Sud
SiO₂	24.63	24.70	24.85	25.28	34.60	36.08	35.25	35.12
TiO₂	1.12	1.00	1.06	0.72	0.84	0.52	0.81	0.74
Al₂O₃	56.15	56.86	56.11	56.02	34.11	33.92	34.46	34.53
FeO^T	11.61	11.67	11.26	10.77	5.70	4.84	5.01	5.20
MnO	0.00	0.00	0.03	0.06	0.04	0.00	0.06	0.00
MgO	2.54	2.53	2.53	2.64	6.78	7.02	6.94	6.59
CaO	0.00	0.03	0.01	0.01	1.85	0.68	1.29	1.45
Na₂O	0.02	0.03	0.03	0.08	1.61	2.08	1.90	1.75
K₂O	0.00	0.00	0.00	0.00	0.02	0.08	0.10	0.12
Cr₂O₃	0.13	0.05	0.10	0.30	0.14	0.06	0.10	0.19
Total	96.21	96.88	95.96	95.89	85.68	85.27	85.92	85.68
基于46个氧原子计算的阳离子数					基于14个氧原子计算的阳离子数
Si	6.912	6.882	6.975	7.084	3.242	3.361	3.276	3.275
Ti	0.236	0.210	0.224	0.152	0.059	0.036	0.057	0.052
Al	18.578	18.676	18.567	18.508	3.768	3.725	3.775	3.796
Cr	0.029	0.011	0.022	0.066	0.010	0.004	0.007	0.014
Fe²⁺	2.725	2.719	2.643	2.524	0.447	0.377	0.389	0.406
Mn	0.000	0.000	0.007	0.014	0.003	0.000	0.005	0.000
Mg	1.062	1.051	1.058	1.103	0.947	0.974	0.961	0.916
Ca	0.000	0.009	0.003	0.003	0.186	0.068	0.128	0.145
Na	0.011	0.016	0.016	0.043	0.293	0.376	0.342	0.316
K	0.000	0.000	0.000	0.000	0.002	0.010	0.012	0.014
Total	29.553	29.573	29.515	29.498	8.957	8.931	8.953	8.934
X_Mg	0.280	0.279	0.286	0.304	0.679	0.721	0.712	0.693
注：FeO^T=FeO+Fe₂O₃；X_Mg=Mg/(Fe²⁺+Mg).

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附表 6 泥质麻粒岩(样品SC80-6)的温度条件计算

附表 6. Geothermometry of the pelitic granulite (sample SC80-6)

	温度计	LnKD			T(℃)
峰期变质阶段	Grt-Bt (9 kbar)	0.948	780	823	809
		0.964	786	817	811
		0.884	773	847	825
		0.912	761	836	817
峰后减压变质阶段	Grt-Crd (6.2 kbar)	2.166		633	639	648	672
		2.241		614	620	626	650
		2.137		641	646	657	681
		2.192		626	632	640	664
		2.238		615	621	627	651
		2.221		619	625	632	656
	Grt-Bt (6.2 kbar)	1.608	715	612	638	638
		1.511	751	636	659	666
		1.445	778	653	670	687
参考文献		1	2	3	4	5
注：地质温度计引用文献：1.Holdaway(2000)；2.Holdaway and Lee(1977)；3.Perchuk et al.(1985)；4.Thompson(1976)；5.Bhattacharya et al.(1988).

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附表 7 泥质麻粒岩(样品SC80-6)的压力条件计算

附表 7. Geobarometry of the pelitic granulite (sample SC80-6)

	压力计				P(kbar)
峰期变质阶段	Grt-Pl-Sil-Qz (800 ℃)	6.1	8.0	6.9
		7.7	9.4	8.5
		5.4	7.3	6.3
		5.6	8.0	6.1
峰后减压变质阶段	Grt-Crd-Sil-Qz (650 ℃)				5.9	6.2	6.6
					5.8	6.1	6.7
					5.7	6.0	6.7
					6.0	6.3	6.4
					5.9	6.2	6.6
					6.0	6.2	6.4
	Grt-Bt-Pl-Qz (750 ℃)							4.4
								5.1
								4.5
参考文献		1	2	3	4	5	6	7

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