| 地质速率计—矿物氧扩散的应用 |
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| 引用本文： | 傅斌,郑永飞.地质速率计—矿物氧扩散的应用[J].地球科学进展,1997,12(5):428-433. |
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| 作者姓名： | 傅斌 郑永飞 |
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| 作者单位： | 中国科学技术大学地球与空间科学系 |
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| 摘 要： | 概述了同位素封闭体系内的矿物氧扩散和同位素交换机制及其在地质速率计上的应用。火成岩从高温冷却或变质岩从高峰主质温度冷却过程中，由于冷却速度不同，扩散作用导致的矿物晶体内部及晶粒间氧同位素再平衡也有所不同。通过实测岩石中各组成矿物氧同位素比值，模式含量和颗粒半径，据矿物氧扩散和同位素交换模型，可以估算出岩石的冷却速率。
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| 关 键 词： | 地质速率计 氧扩散 氧同位素交换 矿物 |
APPLICATION OF OXYGEN DIFFUSION IN MINERALS TO GEOSPEEDOMETRY |
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| FU Bin,ZHENG Yongfei,WEI Chunsheng.APPLICATION OF OXYGEN DIFFUSION IN MINERALS TO GEOSPEEDOMETRY[J].Advance in Earth Sciences,1997,12(5):428-433. |
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| Authors: | FU Bin ZHENG Yongfei WEI Chunsheng |
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| Institution: | Department of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026 |
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| Abstract: | Oxygen diffusion in minerals and accompanied isotopic exchange inclosed systems are discussed with special application to geospeedometry. The extent of either intractrystalline or intercrystalline isotopic re equilibration by oxygen diffusion in minerals is ascribed to different cooling rates at which igneous rocks were cold from high crystallization temperature or metamorphic rocks from peak metamorphic temperature. According to the models of oxygen diffusion and isotopic exchange in minerals(i.e., Giletti model and Eiler model), the cooling rate of rocks can be calculated from the measured δ 18 O values, modal abundences and grain sizes of major rock forming minerals. Case studies are presented to elucidate the effect of oxygen diffusion on isotopic composition in minerals and its application to determination of cooling rate. |
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| Keywords: | Geospeedometry Oxygen diffusion Isotope exchange Theoretical models Cooling rate Rock forming minerals |
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