| 湖北省随州杨家棚地区辉长岩Rb-Sr同位素年龄 |
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| 引用本文：石玉若,张宗清,刘敦一,唐索寒,王进辉,刘涛.2005.湖北省随州杨家棚地区辉长岩Rb-Sr同位素年龄[J].地球学报,26(6):521-524. |
| DOI：10.3975/cagsb.2005.06.06 |
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| 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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| 中文摘要:对湖北省随州地区组成花山蛇绿混杂岩的杨家棚MORB型辉长岩进行了RbSr同位素分析,其矿物(辉石、斜长石)等时线年龄为435±49(2σ)Ma,ISr为0.70516±28(2σ),与该地区出露的三里岗二长花岗岩的RbSr等时线年龄(422Ma)在误差范围内是一致的;反映了该地区在加里东期曾受到强烈地质事件的作用,并进一步表明花山洋盆可能是一个形成年龄较老的洋盆,以前有关花山洋盆存在时限(海西印支期)的推测在这里没有得到确证。 |
| 中文关键词:杨家棚 辉长岩 同位素年龄 加里东期 |
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| Rb-Sr Isotope Dating of Gabbro from Yangjiapeng Area in Suizhou,Hubei Province |
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| Abstract: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. |
| keywords:Yangjiapeng gabbro isotope dating Caledonian |
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