0.1 GPa块状榴辉岩脱水部分熔融: 局部熔融体系和温度的影响

姜杨; 周汉文; 杨启军; 徐学纯; 马瑞

0.1 GPa块状榴辉岩脱水部分熔融: 局部熔融体系和温度的影响

姜杨^{1, 2,},
周汉文^{1, 2},
杨启军¹,
徐学纯³,
马瑞³

1.
中国地质走学地球科学学院，湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室，湖北武汉 430074
3.
吉林大学地球科学学院，吉林长春 130061

基金项目:

教育部科学技术研究重点项目 02027

详细信息

作者简介:
姜杨(1980-), 女, 硕士研究生, 研究方向为变质岩岩石学.E-mail:Jiangyang_tqt@163.com

中图分类号: P589.1;P588.3
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出版历程
- 收稿日期: 2005-08-12
- 刊出日期: 2006-01-25

Dehydration Partial Melting Experiment on Solid Eclogite at 0.1 GPa: The Influence of Localized Melting System and Temperature

JIANG Yang^{1, 2
,},
ZHOU Han-wen^{1, 2},
YANG Qi-jun¹,
XU Xue-chun³,
MA Rui³

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Grealogical Processes and Mineral Resources, China Urirersiry of Geosciences, Wuhan 430074, Chima
3.
College of Eurih Sriences, Jilin University, Changchun 130061, China

摘要

摘要: 选取了湖北英山东冲河含有含水矿物黑云母和角闪石的退变质榴辉岩块状样品, 在0.1 GPa的恒压下, 分别进行了750、800、850、900℃四个温阶、恒温加热4 h的开放体系的脱水部分熔融实验.熔融从含水矿物的脱水暗化开始, 850℃时出现玻璃质熔体.镜下观察显示, 熔体主要分布在后成合晶边界、熔融程度最高的样品顶端、石英颗粒边界及裂隙内部这3个局部熔融体系内.受局部体系内部物质组成的控制, 同一温阶、不同体系内的熔体成分变化很大, 呈基性、中性和酸性.随着温度的升高, 同一体系内的熔体成分均向酸性方向演化.该实验结果表明, 恒压下局部熔融体系内物质组成的不同和温度的变化是影响熔体成分的2个重要因素, 这为理解榴辉岩块状样品的脱水部分熔融行为及与其他基性变质岩类的熔融行为进行对比提供了实验依据.
- 局部熔融体系 /
- 温度 /
- 脱水部分熔融 /
- 块状样品 /
- 退变质榴辉岩 /
- 英山东冲河
Abstract: This study presents the open and dehydration melting experiments on solid retrograde eclogite from Dongchonghe in Yingshan, Hubei Province. The sample contains hydraous hornblende and biotite. The experiments are at 0. 1 GPa and 750, 800, 850 and 900℃. The duration time for heating is 4 h. The initial melting commences from dehydration melting of hydrous minerals, and melts appear at 850℃. Melts are mainly in the three localized melting systems: they are the grain boundaries of symplectite, one side of sample on which is higher melting degree, and the grain boundaries and cracks of quartz. Because of different compositions of minerals in different localized melting systems, chemical compositions of melts range from basic to acid at the same temperature. And it runs to acid at the same localized melting system as increase of temperature. This study implies, at the same pressure, temperature and different compositions of minerals in different localized melting systems are the two main factors that influence compositions of melts. And it provides experimental evidences to understand dehydration melting behavior of eclogite and to contrast with other basic metamorphic rocks.
- localized melting system /
- temperature /
- dehydration partial melting /
- solid sample /
- retrograde eclogite /
- Dong-chonghe in Yingshan.

HTML全文

图 1 英山东冲河退变质榴辉岩原岩及其部分熔融过程的岩相学特征

a.原岩退变质现象明显, 单偏光; b.750℃两类后成合晶(Bi+Ab和Hb+Ab)强烈脱水暗化, 单偏光; c.850℃初始熔融, 熔体(melt)优先出现在后成合晶和石英之间, 背散射电子像; d.900℃熔融程度最高的样品顶端中仅残留少量石英和后成合晶, 背散射电子像

Fig. 1. Characters and process of partial melting of retrograde eclogite from Dongchonghe in Yingshan

下载: 全尺寸图片幻灯片

图 2 850℃和900℃不同局部熔融体系内所有熔体成分在TAS岩石分类图解上的分布

Fig. 2. TAS diagram for all melts in different localized melt-ing systems at 850℃and 900℃

下载: 全尺寸图片幻灯片

表 1 实验样品退变榴辉岩全岩化学成分及主要矿物化学成分

Table 1. Bulk compositions and mineral component of the experimental sample

表 2 英山东冲河退变榴辉岩0. 1 GPa.850℃和900 ℃时不同局部体系所有熔体的化学成分

Table 2. Chemical compxsitions of all melts in different localized systens by partial melting of retnograde eclogite from Dongchonghe in Yingshan at 0.1 GPa, 850 ℃ and 900 ℃

表 3 不同局部熔融体系熔体的平均成分

Table 3. Average compositions of melts in different localized melting systems

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