| 皖苏鲁新生代玄武岩的Sr－Nd同位素组成及其含义 |
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| 引用本文：支霞臣,陈道公,张宗清,唐索寒,王进辉.1994.皖苏鲁新生代玄武岩的Sr－Nd同位素组成及其含义[J].地球学报,15(1,2):60-67. |
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| 中文摘要:皖苏鲁新生代碱性玄武岩34个样品的Sr、Nd同位素组成，总的变化范围为， ε￣°CHUR(Nd)=-4.5 -6.9，ε￣°＿UR(Sr)＝－20.4-33.1。分布在大洋玄武岩的Sr-Nd同位素组成范围内。其中江苏省六合－仪征、山东省蓬莱、栖霞和临朐等地区玄武岩同位素组成与PREMA型地幔端元相似，皖东嘉山－来安地区玄武岩具有EMⅠ型地幔端元特征。前者来源于软流圈或更深部的地幔部分，后者来源于不均一的岩石圈地幔部分。来源于软流圈和岩石圈地幔的熔体互相作用决定了皖苏鲁新生代玄武岩Sr-Nd同位素地球化学特 |
| 中文关键词:玄武岩，Sr－Nd同位素组成，皖苏鲁区 |
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| Sr-Nd ISOTOPE GEOCHEMISTRY OF CENOZOIC BASALTS FROM ANHUI,JIANGSU AND SHANDONG PROVINCES |
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| Abstract:Among the Cenozoic continental basalts distributed widely in eastern China,the basalts fromAnhui,Jiangsu and Shandong provinces are important occurences.The basalts in the area beloning tonorm alkaline series,are composed of nephelinolite,basanite,olivine alkaline basalt,olivine basalt andolivine tholeiitic basalt in terms of CIPW norm compositions and total alkali-silica diagram.Sr-Nd isotopic compositions of 34 samples,within the ranges of 4.5 +6.9(ε￣°CHUR(Nd))and 20.4 +33.1(ε￣°UR(Sr)),of Cenozoic continental basalts from Anhui,Jiangsu and ShandongProvinces are similar to that for oceanic island basalts.The Luhe-Yizheng basalts in Jiangsu Provinceand most of Penglai,Qixia and Lingqu basalts in Shandong Province show the characteristics ofPREMA type mantle component in oceanic basalts isotopic system.The Jiashan=Lai an basalts in AnhuiProvince show the characteristics of EMⅠtype mantle component.The former might be derived fromthe asthenospheric mantle or deeper part and the latter might be derived from the heterogeneouslithospheric mantle.The general feature of isotope geochemisny for the continental basalts from thearea in study are determined by the interaction between the melts from the different parts of mantle,lithospheric and asthenospheric or deeper mantle in the case. |
| keywords:basalts Sr-Nd isotopic compositions Auhui,Jiangsu and Shandong, |
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