| 中国东部新生代玄武岩及其地幔包体的氧逸度 |
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| 引用本文： | 张毅刚,鄂莫岚.中国东部新生代玄武岩及其地幔包体的氧逸度[J].岩石学报,1994,10(2). |
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| 作者姓名： | 张毅刚 鄂莫岚 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 地幔环境的氧逸度与温度和压力一样，是控制许多地幔过程的一个重要参数。本文计算了中国东部几个具有代表性地区的玄武岩和尖晶石二辉橄榄岩的氧逸度，尖晶石二辉橄榄岩的氧逸度变化不大，均位于１ｏｇ（ｆｏ２）＝ｌｏｇ（ｆｏ２ＦＭＱ）＋０．０左右，而各地区玄武岩的氧逸度却变化很大，其平均值从尚志地区的ｌｏｇ（ｆｏ２ＦＭＱ＋０．６到长白山地区的ｌｏｇ（ｆｏ２ＦＭＱ）＋３．３左右（其中东北地区钾质玄武岩的氧逸度比除尚志以外其它地区的低），并且总体具有比地幔橄榄岩高得多的氧逸度。推测钾质玄武岩和尚志地区破性玄武岩的氧逸度比中国东部其它地区玄武岩的氧逸度低的可能原因是，前二个地区的玄武岩来源于更深部的（金云母）石榴石二辉橄榄岩，而其它地区的玄武岩来源于略浅部的尖晶石二辉橄榄岩。
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| 关 键 词： | 玄武岩，地幔包体，氧逸度，中国东部 |
THE OXYGEN FUGACITIES OF CENOZOIC BASALTIC MAGMAS AND THEIR ENCLOSED MANTLE XENOLITHS |
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| Zhang Yigang and E Molan.THE OXYGEN FUGACITIES OF CENOZOIC BASALTIC MAGMAS AND THEIR ENCLOSED MANTLE XENOLITHS[J].Acta Petrologica Sinica,1994,10(2). |
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| Authors: | Zhang Yigang and E Molan |
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| Abstract: | Oxygen fugacity in the Earth's tipper mantle.similar to temperature and pressure,also is a key important parameter in control ling many mantle processes.The calculations of oxygen fugacities of representative Cenozoic hasal is and their enclosed spinel lherzolite in eastern China using experimentally calibrated equations show that the oxygen fugacities of spinel lherzolite vary in a very small range with an average value of FMQ 0. 0,and that,on the contrary, the oxygen fugacities Cenozoic basalts vary in a very large range, with average values from FMQ 0. 6 for the Shanzhi area to FMQ 3. 3 for Chagbaishan area both in north eastern China.Discussions have been made on the meaningness of the results of above calculations and the interactions between mantle fi fluids melts.and mantle rocks. |
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| Keywords: | Oxygen fugacity Basaltic magma Mantle xenolith Eastern China |
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