| 扬子地块东段大陆岩石圈地幔的氧逸度 |
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| 引用本文： | 支霞臣,李彬贤,陈道公,苏永军.扬子地块东段大陆岩石圈地幔的氧逸度[J].岩石矿物学杂志,1996,15(2):146-152. |
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| 作者姓名： | 支霞臣 李彬贤 陈道公 苏永军 |
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| 作者单位： | 中国科学技术大学地球和空间科学系，第三世界科学院中国科大地球科学和天文学高级研究中心，中国科学技术大学地球和空间科学系 |
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| 摘 要： | 由尖晶石相橄榄岩包体中的矿物化学成分，采用新近校准的ＦＦＭ地质氧逸度计和地质温－压计，计算包体的平衡氧逸度，Δｌｏｇ（ｆＯ２）ＦＭＱ＝－３．３２－０．１２，它反映了扬子地块东段大陆岩石圈地幔的氧化还原状态。两种氧逸度计计算结果相差在０．５ｌｏｇｆＯ２单位内。
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| 关 键 词： | 氧逸度，尖晶石相橄榄岩包体，大陆岩石圈地幔，扬子地块东段 |
The Redox State of Subcontinental Lithospheric Mantle Beneath Eastern Yangtze Block |
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| Zhi Xiachen,Li Binxian,Su Yongjuan,Chen Daogong.The Redox State of Subcontinental Lithospheric Mantle Beneath Eastern Yangtze Block[J].Acta Petrologica Et Mineralogica,1996,15(2):146-152. |
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| Authors: | Zhi Xiachen Li Binxian Su Yongjuan Chen Daogong |
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| Abstract: | Chemical compositions of the coexistent mineral phases (olivine, spinet, clinopyroxene and orthopyroxene) in the spinet lherzolite and harzburgite xenoliths from Fanshan and Panshishan,Jiangsu Province, were determined by the electron and proton microprobe. The equilibrium oxygen fugacities were calculated by two oxygen geobarometers calibrated by Ballhaus et al.(1991) and Bryndzia and Wood (1990 ) respectively. The difference between the two results is lower than 0. 5 log(fO2)`FMQ unit. The oxygen fugacities of the spinet peridotite zone in subcontinental lithospheric mantle beneath Eastern Yangtze Block are flog( fO2)FMQ=-2.0-0. 5, the typical values for subcontinental lithospheric mantle worldwide. The accurate Fe3+/Fe2+ atio of spinet is a key factor for the calculation of oxygen fugacity. |
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| Keywords: | oxygen fugacity peridotite xenolith of spinel phase subcontinental lithospheric mantle Eastern Yangtze Block |
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