| 湖北省随州杨家棚地区辉长岩Rb-Sr同位素年龄 |
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| 关键词:Yangjiapeng gabbro isotope dating Caledonian |
| 基金项目:自然科学基金项目（编号：40472119）,国土资源部“百人计划”项目（编号：2004239） |
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| Rb-Sr Isotope Dating of Gabbro from Yangjiapeng Area in Suizhou,Hubei Province |
| This paper reports Rb-Sr isotope dating of Yangjiapeng MORB gabbro which constitutes Huashan ophiolitic melange. A whole-rock sample and the minerals (plagioclase and clinopyroxene) picked out from the sample give a Rb-Sr isochron age of 435±49(2σ) Ma, with I_ Sr being 0.70516±28(2σ). The age is consistent with the Rb-Sr isochron age (422 Ma) of the adamellite from Sanligang area. The results indicate that intense metamorphism must have taken place in this area in Caledonian period, and that the Huashan ocean basin was probably formed older than the previous prediction. The previous deduction about the age limit of Huashan ocean cannot be conclusively proved. |
| SHI Yu-ruo,ZHANG Zong-qing,LIU Dun-yi,TANG Suo-han,WANG Jin-hui,LIU Tao.2005.Rb-Sr Isotope Dating of Gabbro from Yangjiapeng Area in Suizhou,Hubei Province[J].Acta Geoscientica Sinica,26(6):521-524. |
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