| 甘肃北山野马泉岩体同位素地球化学特征 |
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| 关键词:Sm-Nd-Pb isotope compositions petrogenesis Yemaquan granitic complex Beishan in Gansu Province |
| 基金项目:本文为国防科工委放射性废物治理专项研究成果。 |
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| Isotopic Geochenical Characteristics of Yemaquan Granitic Intrusions in Beishan Area, Gansu Province |
| Sm-Nd-Pb isotope compositions reveal that I-type granite characteristics of the Ⅰ、Ⅱ Yemaquan intrusions are as follows：(87Sr/86Sr)i＝0.708~0.710, εNd=-2.2291~-5.8664，and the plot of 207Pb/204Pb versus 206Pb/204Pb is near and below the evolutionary curve of the orogenic belt. The granitoids are characterized by mixed (crust+mantle) origin of rock-forming materials.The Ⅲ granitoid is S-type granite, whose (87Sr/86Sr), are 0.7149-0.7358 andεNd are-7.3750~-8.9556. The geodynamic environment of the granitoids was the Beishan orogenic belt related to intercontinental collision, especially at the time when collision was drawing to its end. |
| FAN Honghai,MIN Maozhon,CHEN Jia,JI Ruili.2005.Isotopic Geochenical Characteristics of Yemaquan Granitic Intrusions in Beishan Area, Gansu Province[J].Acta Geoscientica Sinica,26(z1):78-83. |
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