大别山双河超高压榴辉岩中的水: 微区红外光谱分析

盛英明; 夏群科; 郝艳涛; 王汝成; 陈小明

大别山双河超高压榴辉岩中的水: 微区红外光谱分析

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.
南京大学内生金属矿床成矿机制研究国家重点实验室，江苏南京 210093

基金项目:

国家自然科学基金项目 40172027

详细信息

作者简介:
盛英明(1977—)，男，博士研究生，地球化学专业.E-mail：ymsaint@mail.ustc.edu.en

中图分类号: 575.4; P511.5
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出版历程
- 收稿日期: 2005-07-15
- 刊出日期: 2005-11-25

Water in UHP Eclogites at Shuanghe, Dabieshan: Micro-FTIR Analysis

1.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
State Key Laboratory of Mineral Deposits Research, Nanjing University, Nanjing 210093, China

摘要

摘要: 大陆深俯冲板块到一定深度后(约90~110km), 几乎没有含水矿物存在, 超高压岩石中名义上无水矿物(NAMs) 成为俯冲板块中水的主要载体, 是示踪超高压变质流体的重要途径.对大别山双河地区超高压榴辉岩中的石榴石和绿辉石进行了详细的微区傅立叶变换红外光谱(MicroFTIR) 分析.FTIR结果显示所有石榴石和绿辉石颗粒都含有结构水, 以OH的形式存在, 其含量范围分别为(30~1860)×10^-6和(360~620)×10^-6.榴辉岩全岩水含量为(300~750)×10^-6, 表明即使是在超高压变质作用的温压条件下, 榴辉岩也可以至少携带数百10^-6的水进入深部地球.对石榴石颗粒内部的多点观察发现, 结构水含量的分布出现2种情况: (1) 颗粒内部的均一分布; (2) 核部水含量高而边部低.石榴石颗粒边部的低水含量可能是抬升过程中由于压力降低引起的H扩散所致, 扩散出来的H可能构成了早期退变质流体的重要来源.对于同一样品来说, 结构水含量在绿辉石和石榴石之间的比值为0.5~3.5.
- 石榴石 /
- 绿辉石 /
- 榴辉岩 /
- 结构水 /
- 双河 /
- 大别山
Abstract: When the continental crust subducted to a certain depth (~90-110 km), almost no hydrous minerals existed in the plate, and nominally anhydrous minerals (NAMs, such as garnet, pyroxene, quartz) in UHP rocks became the main carriers transporting water into the mantle. Garnet and omphacite in UHP eclogites at Shuanghe, Dabieshan have been investigated by Micro-FTIR. The results demonstrate that all garnet and omphacite grains contain structural water occurring as hydroxyl (OH) with the content from 30×10^-6 to 1860×10^-6 (H ₂O wt.) and from 360×10^-6 to 620×10^-6, respectively. The water content (300×10^-6 to 750×10^-6) of whole rocks suggests that UHP rocks can recycle at least several hundred ×10^-6 water into the mantle by deep continental subduction. There are two types of water distribution characteristics within a single garnet grain, one is homogeneous and the other has higher water content in the core and lower in the rim. The lower water content in the rim possibly arises from hydrogen diffusion in response to a sharp decrease in pressure during the exhumation, and the expelled hydrogen may be the source of early-stage retrograde fluid. The ratio of water content in omphacite and garnet is between 0.5 and 3.5.
- garnet /
- omphacite /
- eclogite /
- structural water /
- Shuanghe /
- Dabieshan

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图 1 大别山地质简图及双河的位置

Fig. 1. Simplified geological map of Dabieshan and locality of Shuanghe

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图 2 大别山双河榴辉岩中石榴石的代表性红外光谱(a)、石榴石红外光谱与水合钙铝榴石(hydrogrossular, Rossman and Aines, 1991)、钙铁榴石(andradite, Amthauer and Rossman, 1998)、水合钙铁榴石(hydroandradite, Amthauer and Rossman, 1998) 的比较(b)、双河超高压榴辉岩中绿辉石的代表性红外光谱(c)

a.上、下两图分别显示颗粒内部水含量核高边低和均一分布的情况, C.核部, R.边部

Fig. 2. Representative spectra of garnets from UHP eclogites at Shuanghe, Dabieshan (a); Comparison of spectra of Shuanghe garnets with hydrogrossular (Rossman and Aines, 1991), andradite (Amthauer and Rossman, 1998) and hydroandradite (Amthauer and Rossman, 1998) (b); Representative spectra of omphacites from UHP eclogites at Shuanghe, Dabieshan (c)

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图 3 大别山双河超高压榴辉岩中石榴石结构水含量的柱状图(a)、双河榴辉岩中绿辉石的水含量与Kazakhstan榴辉岩中绿辉石水含量的比较(Kazakhstan绿辉石数据引自Katayama and Nakashima, 2003) (b)

Fig. 3. Histogram of water content of garnets from UHP eclogites at Shuanghe, Dabieshan (a), comparison of water content of Shuanghe omphacites with that of Kazakhstan omphacites (Katayama and Nakashima, 2003) (b)

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图 4 大别山双河石榴石中结构OH吸收强度与流体包裹体中分子水吸收强度

结构OH吸收强度表示为Group Ⅱ和Ⅲ的积分面积之和, 分子水吸收强度表示为Group Ⅰ的积分面积, 详细数据见表 3

Fig. 4. Relationship between intensity of structural OH and intensity of water in submicroscopic inclusions in garnets from UHP eclogites at Shuanghe, Dabieshan. Intensity of structural OH is the sum of areas of group Ⅱ and group Ⅲ, intensity of inclusion water is the area of group Ⅰ

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图 5 大别山双河榴辉岩中绿辉石的结构水含量与M₂空位

Fig. 5. Relationship of structural OH and M₂ vacancy in omphacites from UHP eclogites at Shuanghe, Dabieshan

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表 1 大别山双河榴辉岩中石榴石的化学组成

Table 1. Chemical compositions of garnets in eclogites from Shuanghe, Dabieshan

表 2 大别山双河榴辉岩中绿辉石的化学组成

Table 2. Chemical compostions of omphacites in eclogites from Shuanghe, Dabieshan

表 3 大别山双河榴辉岩中石榴石的红外光谱分析结果

Table 3. FTIR analysis of garnets from UHP eclogites at Shuanghe, Dabieshan

表 4 大别山双河榴辉岩中绿辉石的红外光谱分析结果

Table 4. FTIR analysis of omphacites from UHP eclogites at Shuanghe, Dabieshan

表 5 大别山双河榴辉岩的全岩水含量

Table 5. Water content of whole rocks of UHP eclogites at Shuanghe, Dabieshan

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