岩浆绿帘石特征及其地质意义研究进展

doi:10.11867/j.issn.1001-8166.2005.04.0442

地球科学进展 ›› 2005, Vol. 20 ›› Issue (4): 442 -448. doi: 10.11867/j.issn.1001-8166.2005.04.0442

岩浆绿帘石特征及其地质意义研究进展

张华锋 ¹,叶青培 ²,翟明国 ¹

1.中国科学院地质与地球物理所，北京 100029；2.中国地质博物馆,北京 100034

收稿日期:2004-03-15 修回日期:2004-09-07 出版日期:2005-04-25
通讯作者: 张华锋
基金资助:
国家自然科学基金重点项目“山东半岛—朝鲜半岛克拉通基底和造山带对比研究”（编号：40234050）；中国科学院知识创新工程重大项目“华北东部盆山系统与战略资源预测”（编号：KZCX-07）资助

SUMMARY OF CHARACTERISTICS AND SIGNIFICANCE OF THE MAGMATIC EPIDOTE

ZHANG Huafeng ¹;YE Qingpei ²;ZHAI Mingguo ¹

1.Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029,China;2.Chinese Museum of Geology, Beijing 100034,China

Received:2004-03-15 Revised:2004-09-07 Online:2005-04-25 Published:2005-04-25

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综述了国际上对岩浆绿帘石的研究成果，总结了岩浆绿帘石的特征及其在花岗质岩浆中的结晶行为，讨论了岩浆绿帘石的地质意义。岩浆绿帘石的稳定与岩浆成分、fH₂O以及fO₂关系密切。它通常作为中、高压近固相线结晶矿物，主要产于英云闪长岩、花岗闪长岩、花岗岩等钙碱性花岗质岩石中。该矿物在岩浆中的结晶可早可晚（相对于黑云母或角闪石），氧逸度的高低直接影响到它在岩浆中的最小稳定压力。作为早期结晶的矿物，绿帘石不能作为压力计来反映岩体侵位深度，因为在绿帘石晶出时，岩浆中液相体积在50%～80%，这样岩浆可能会有快速侵位的过程，但它的地质意义在于能够对岩浆上升速率做出估算。而晚期近固相线晶出的绿帘石时，能够作为压力计反映岩体最小侵位深度。据此可以应用于对地壳演化和隆升的研究。由于氧逸度对绿帘石的稳定有很大影响，因此在能够作为压力计时，首先需要确定岩浆氧逸度情况。通常磁铁矿型花岗岩最小侵位深度在3×10⁸ Pa左右（10 km），而钛铁矿型为5×10⁸ Pa以上(17～20 km)。

关键词: 花岗岩, 压力计, 岩浆绿帘石

Recent advances and geological significance of magmatic epidote(MEp) are summaried in this article. MEp stability in magma is firmly correlated with temperature, pressure, fH₂O and fO2. Crystallization sequence from magma of MEp depends on pressure but not fO₂. while,fO₂ can changes MEp minimum cystallization pressure from 5×10⁸ Pa(fO₂=NNO)to 3×108 Pa(fO₂=HM). MEp which crystallized earlier than biotite or hornblende in the magma, can not be used as a barometer, but be useful in caculating the ascent speed of magma. Those MEp that occurred as subsolid mineral with or without resorption of earlier-formed hornblende, can be use as pressure indicator for intrusion. With respect to the influence of fO₂, Granite can be subdivided into Magnetite and Ilmenite series. MEp that occurred in Magnetite series granite indicates the minimum pressure of 3kbar and 5kbar of Ilmenite series granite.

Key words: Magmatic epidote, Granite, Barometer

中图分类号:

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