大别山金河桥超高压榴辉岩石榴石中的水

蒋素会; 王志民; 陈仁旭; 郑永飞; 朱琳

doi:10.3799/dqkx.2019.132

大别山金河桥超高压榴辉岩石榴石中的水

doi: 10.3799/dqkx.2019.132

蒋素会^1,,
王志民¹,
陈仁旭^{1, 2, , ,},
郑永飞^{1, 2},
朱琳¹

1.
中国科学院壳幔物质与环境重点实验室, 中国科学技术大学地球和空间科学学院, 安徽合肥 230026
2.
中国科学院比较行星学卓越创新中心, 安徽合肥 230026

基金项目:

中科院先导项目 XDB18020303

国家自然科学基金项目 41590624

国家自然科学基金项目 41873033

详细信息

作者简介:
蒋素会(1993-), 女, 硕士研究生, 主要研究名义上无水矿物中水.E-mail:jshsx@mail.ustc.edu.cn

通讯作者:
陈仁旭(1981-)

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2019-06-03
- 刊出日期: 2020-04-15

Water of Garnet in Eclogite from Jinheqiao Area in the Dabie Orogen

Jiang Suhui^1
,,
Wang Zhimin¹,
Chen Renxu^{1, 2
, ,
,},
Zheng Yongfei^{1, 2},
Zhu Lin¹

1.
Key Laboratory of Crust-Mantle Materials and Environments of Chinese Academy of Sciences, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
Center for Excellence in Comparative Planetology of Chinese Academy of Sciences, Hefei 230026, China

摘要

摘要: 名义上无水矿物的水含量研究对于认识俯冲带流体活动和地球动力学具有重要意义.对大别山金河桥榴辉岩中石榴石进行了傅里叶变换红外光谱分析和主微量元素分析，结果表明石榴石含有分子水和结构羟基，分别为 < 1×10^-6~1 946×10^-6和< 1×10^-6~1 347×10^-6.石榴石羟基含量与Ca、Na、Ti、Zr和Pr正相关，而与Si负相关，表明羟基结合机制以水榴石替代为主并伴有其他机制.分子水主要为初始水或折返过程中羟基转化形成.石榴石总水含量为 < 1×10^-6~3 293×10^-6，最大值对应于峰期超高压石榴石水储存能力.水在峰期石榴石中可达到饱和.石榴石变化的水含量受原岩性质、流体可获得性、压力和温度等多种因素控制，但主要由折返过程中降压脱水导致.石榴石平均总水含量为749×10^-6~1 164×10^-6，是俯冲板片向地幔水传输的重要介质.
- 榴辉岩 /
- 石榴石 /
- 名义上无水矿物 /
- 水 /
- 流体活动 /
- 俯冲带 /
- 岩石学
Abstract: Nominally anhydrous minerals (NAMs) are major components of the subducted continental slab and thus regarded as important water reservoir in continental subduction zone. The water contents of NAMs are critical for understanding of fluid action and geodynamics of subduction zones. In this study,Fourier Transform Infrared Spectroscopy (FTIR) as well as major and trace element analyses were carried out on garnets in Jinheqiao eclogites from the Dabie orogen. The results demonstrate that garnet grains contain molecular water and hydroxyl (OH) with the contents of < 1×10^-6 to 1 946×10^-6 and < 1×10^-6 to 1 347×10^-6,respectively. Contents of hydroxyl are positively correlated with Ca,Na,Ti,Zr and Pr,but negatively correlated with Si for garnets in most samples,indicating that the incorporation of OH in garnet is dominated by hydrogarnet substitution. Molecular water is primary or transformed from hydroxyl during exhumation,implying molecular water an internal origin in eclogite. Garnet has total water contents varying from < 1×10^-6 to 3 293×10^-6,with the highest water content corresponding to the garnet's capacity for water storage under peak UHP metamorphism. Water can be saturated in peak metamorphic garnet. The variable water contents in garnet have been controlled by several factors including protolith nature,fluid availability,pressure and temperature,which however,have been dominated by decompression dehydration during exhumation. Garnets in the Jinheqiao eclogites have average total water contents ranging from 749×10^-6 to 1 164×10^-6,suggesting that they have similar capacity for water storage as omphacite and thus are important media for subducted slab to transport water into deep mantle.
- eclogite /
- garnet /
- nominally anhydrous minerals /
- water /
- fluid action /
- subduction zone /
- petrology

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图 1 大别山地质简图及采样位置

据Lin et al. (2009)和Wei et al. (2013)修改

Fig. 1. Geological maps of Dabie orogen (a, b) and study area (c) with sample location

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图 2 金河桥榴辉岩野外露头照片

a.块状榴辉岩；b.条带状榴辉岩

Fig. 2. Photos of Jinheqiao eclogite in the field

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图 3 金河桥榴辉岩岩相学照片

a.样品16DB20；b.样品16DB25；c.样品16DB27-1；d.样品16DB27-4；e.样品16DB27-2；f.样品16DB27-7.Grt.石榴石；Omp.绿辉石；Qtz.石英；Ms.白云母；Zo.黝帘石；Rt.金红石；Amp.角闪石

Fig. 3. Petrographic photos of Jinheqiao eclogite

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图 4 金河桥榴辉岩中石榴石端员组分的三元图解

Alm.铁铝榴石；Grs.钙铝榴石；Pyr.镁铝榴石；Sps.锰铝榴石；And.钙铁榴石

Fig. 4. End member components of garnet in Jinheqiao eclogite

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图 5 金河桥榴辉岩中石榴石稀土元素配分图解

球粒陨石标准化值来自Sun and McDonough (1989)

Fig. 5. Chondrite-normalized REE patterns of garnets for Jinheqiao eclogite

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图 6 金河桥榴辉岩中石榴石代表性红外吸收光谱

吸收度标准化到1 cm厚度

Fig. 6. Representative FTIR spectra of garnet in Jinheqiao eclogite

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图 7 金河桥榴辉岩石榴石M型水含量与I型羟基水含量相关性图解

Fig. 7. Relationship between contents of M-type H₂O and I-type OH in garnet from Jinheqiao eclogite

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图 8 金河桥榴辉岩石榴石M型水含量与III型羟基水含量相关性图解

Fig. 8. Relationship between contents of M-type H₂O and III-type OH in garnet from Jinheqiao eclogite

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图 9 金河桥榴辉岩石榴石M型水含量与羟基水含量相关性图解

Fig. 9. Contents of structural hydroxyl due to band type I, II and III, respectively, plotted against the amount of molecular water (M-type) in garnet from Jinheqiao eclogite

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图 10 金河桥榴辉岩石榴石不同种型水含量统计

Fig. 10. Histograms illustrating distribution and contents of different types of water in garnet from Jinheqiao eclogite

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图 11 石榴石水含量剖面

Fig. 11. The distribution of water content in the same garnet grains

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图 12 金河桥榴辉岩石榴石组成与水含量之间关系图解

Fig. 12. Relationship between composition and water content of garnet from Jinheqiao eclogite

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表 1 金河桥榴辉岩矿物含量(%)

Table 1. Contents of minerals in Jinheqiao eclogite(%)

样品编号	构造	绿辉石	石榴石	白云母	石英	角闪石	金红石	帘石	锆石	磷灰石	后成合晶
16DB20-1	块状	50	35	4	2	1	1	1	< 1	< 1	4
16DB25-2	块状	58	27	2	5	1	1	0	< 1	< 1	4
16DB27-1	块状	56	37	1	1	1	1	0	< 1	< 1	1
16DB27-4	块状	50	37	1	2	3	1	0	< 1	< 1	4
16DB27-2	条带状	35	54	2	3	2	1	0	< 1	< 1	1
16DB27-7	条带状	20	54	1	20	1	1	0	< 1	< 1	1

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表 2 金河桥榴辉岩石榴石代表性主量元素组成

Table 2. Representative garnet major element compositions for Jinheqiao eclogite

Sample	16DB27-4					16DB27-2					16DB27-7
Spot	Grt3	Grt8	Grt19	Grt22	Grt26	Grt1	Grt13	Grt18	Grt22	Grt29	Grt1	Grt18	Grt24	Grt27	Grt39
SiO₂	39.30	38.94	40.05	38.68	38.17	39.02	38.77	38.67	38.87	39.36	40.04	38.74	39.55	39.40	38.98
TiO₂	0.01	0.00	0.00	0.02	0.01	0.01	0.00	0.03	0.05	0.00	0.03	0.04	0.00	0.02	0.00
Al₂O₃	22.21	22.42	21.80	22.49	23.85	22.30	22.47	22.44	22.23	22.53	22.33	24.22	22.63	22.26	22.37
Cr₂O₃	0.07	0.00	0.01	0.02	0.06	0.07	0.08	0.06	0.03	0.05	0.05	0.03	0.04	0.05	0.09
FeO	19.23	18.93	19.56	18.59	17.54	20.13	18.97	19.88	18.75	19.45	18.99	18.95	19.91	18.91	20.79
MnO	0.42	0.40	0.38	0.37	0.37	0.44	0.32	0.42	0.41	0.35	0.42	0.41	0.35	0.39	0.39
MgO	7.93	8.81	9.41	9.20	8.95	9.18	8.27	8.52	9.15	9.56	9.56	9.73	10.21	10.73	9.46
CaO	10.46	9.93	8.64	10.13	9.86	8.29	10.09	9.46	9.86	8.60	8.49	7.66	7.01	7.48	7.62
Total	99.63	99.43	99.85	99.50	98.81	99.43	98.98	99.47	99.33	99.90	99.92	99.77	99.71	99.22	99.71
Atom per 12 O
Si	3.00	2.96	3.03	2.94	2.90	2.97	2.97	2.95	2.96	2.98	3.02	2.90	2.99	2.98	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	0.00	0.00
Al iv	0.00	0.04	0.00	0.06	0.10	0.03	0.03	0.05	0.04	0.02	0.00	0.10	0.01	0.02	0.03
Al vi	1.99	1.98	1.94	1.96	2.04	1.98	2.00	1.98	1.96	1.99	1.98	2.05	2.00	1.97	1.97
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	0.00	0.01
Fe₂₊	1.22	1.19	1.21	1.15	1.17	1.27	1.22	1.25	1.16	1.22	1.20	1.26	1.26	1.17	1.30
Fe₃₊	0.00	0.02	0.03	0.03	0.00	0.01	0.00	0.02	0.03	0.01	0.00	0.00	0.00	0.02	0.02
Mn	0.03	0.03	0.02	0.02	0.02	0.03	0.02	0.03	0.03	0.02	0.03	0.03	0.02	0.03	0.02
Mg	0.90	1.00	1.06	1.04	1.01	1.04	0.94	0.97	1.04	1.08	1.07	1.09	1.15	1.21	1.07
Ca	0.85	0.81	0.70	0.83	0.80	0.68	0.83	0.77	0.80	0.70	0.68	0.61	0.57	0.61	0.62
Total	8.00	8.02	7.99	8.04	8.05	8.02	8.01	8.02	8.02	8.01	7.99	8.04	8.01	8.01	8.02
Almandine	40.5	38.1	39.6	35.7	36.6	41.2	39.6	40.0	36.9	39.7	40.1	40.5	41.8	38.2	42.0
Andradite	0.20	0.95	1.30	1.73	0.00	0.75	0.00	0.82	1.69	0.54	0.00	0.00	0.00	1.16	1.0
Grossular	28.1	26.4	22.4	26.3	27.5	21.8	27.7	25.2	25.4	22.7	22.8	21.1	18.9	19.0	19.7
Pyrope	30.1	33.7	35.9	35.5	35.0	35.1	31.8	32.9	35.1	36.2	36.0	37.4	38.5	40.6	36.2
Spessartine	0.91	0.86	0.82	0.80	0.82	0.96	0.71	0.92	0.89	0.75	0.91	0.89	0.75	0.84	0.8
Uvarovite	0.22	0.00	0.02	0.07	0.19	0.21	0.24	0.18	0.09	0.15	0.15	0.10	0.13	0.14	0.3
Sample	16DB27-4					16DB27-2					16DB27-7
Spot	Grt3	Grt8	Grt19	Grt22	Grt26	Grt1	Grt13	Grt18	Grt22	Grt29	Grt1	Grt18	Grt24	Grt27	Grt39
SiO₂	38.99	39.72	39.45	39.93	39.41	39.41	39.37	39.33	39.09	38.77	39.35	38.87	39.20	39.35	39.04
TiO₂	0.00	0.00	0.00	0.04	0.00	0.00	0.02	0.00	0.00	0.01	0.02	0.04	0.02	0.00	0.03
Al₂O₃	22.52	22.70	22.52	22.53	22.63	22.72	22.62	22.34	22.51	22.33	21.98	22.36	21.54	21.90	21.94
Cr₂O₃	0.03	0.07	0.06	0.08	0.01	0.04	0.06	0.07	0.04	0.05	0.05	0.03	0.03	0.00	0.06
FeO	18.00	17.72	19.81	18.17	19.66	19.34	18.83	19.24	21.48	21.84	21.34	21.60	23.56	22.04	21.65
MnO	0.39	0.39	0.38	0.37	0.39	0.35	0.39	0.39	0.46	0.53	0.42	0.37	0.44	0.41	0.38
MgO	9.55	10.10	9.18	10.13	9.60	10.38	11.04	10.03	9.68	8.79	7.70	7.75	6.23	7.29	7.77
CaO	9.61	8.57	8.24	8.66	7.56	7.44	6.80	8.10	6.31	7.50	8.68	8.25	9.03	9.20	8.76
Total	99.07	99.27	99.65	99.90	99.25	99.69	99.13	99.49	99.58	99.81	99.54	99.27	100.04	100.19	99.63
Atom per 12 O
Si	2.96	2.99	2.99	3.00	2.99	2.97	2.98	2.98	2.98	2.96	3.01	2.98	3.02	3.01	2.99
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	0.00	0.00
Al iv	0.04	0.01	0.01	0.00	0.01	0.03	0.02	0.02	0.02	0.04	0.00	0.02	0.00	0.00	0.01
Al vi	1.98	2.01	2.00	1.99	2.01	2.00	1.99	1.98	2.00	1.98	1.98	2.01	1.96	1.97	1.98
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	0.00	0.00
Fe²⁺	1.13	1.14	1.27	1.14	1.27	1.22	1.19	1.20	1.37	1.38	1.37	1.40	1.50	1.39	1.37
Fe³⁺	0.01	0.00	0.00	0.00	0.00	0.00	0.00	0.02	0.00	0.02	0.00	0.00	0.02	0.02	0.01
Mn	0.02	0.02	0.02	0.02	0.02	0.02	0.02	0.03	0.03	0.03	0.03	0.02	0.03	0.03	0.02
Mg	1.08	1.13	1.04	1.13	1.08	1.17	1.24	1.13	1.10	1.00	0.88	0.89	0.72	0.83	0.89
Ca	0.78	0.69	0.67	0.70	0.61	0.60	0.55	0.66	0.52	0.61	0.71	0.68	0.75	0.75	0.72
Total	8.02	8.00	8.00	8.00	8.00	8.01	8.01	8.01	8.01	8.02	7.99	8.01	7.99	8.00	8.00
Almandine	36.3	38.0	42.1	38.1	42.3	39.7	38.8	39.1	44.8	44.3	45.7	46.7	49.7	46.0	45.5
Andradite	0.63	0.00	0.00	0.00	0.00	0.04	0.05	0.90	0.00	0.97	0.00	0.00	0.78	0.86	0.71
Grossular	25.7	23.0	22.2	23.0	20.5	20.1	18.3	21.0	17.2	19.6	23.7	22.6	24.3	24.4	23.1
Pyrope	36.5	38.0	34.7	37.8	36.3	39.3	41.8	38.0	36.9	33.8	29.5	29.7	24.2	27.8	29.7
Spessartine	0.84	0.83	0.82	0.79	0.83	0.75	0.83	0.84	0.99	1.16	0.91	0.80	0.96	0.90	0.82
Uvarovite	0.10	0.20	0.19	0.23	0.03	0.13	0.18	0.20	0.13	0.14	0.16	0.09	0.09	0.00	0.19

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