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| Study on the Sr,Nd,Pb and O Isotopes of Basic Dyke Swarms in the Wudang Block and Basic Volcanics of the Yaolinghe Group | |
| 摘 要： | The Sr,Nd and Pb isotopic characteristics of the Wudang basic dyke swarms and basic volcanics of the Yaolinghe Group show that they were derived from the same multi-component mixing source in the mantle.The Wudang basic dyke swarms have(^87Sr/^86Sr)i=0.6905-0.7061,εNd(t)=-1.9-5.0,△^208Pb/^204Pb=35.49-190.26,△^207Pb/^204Pb=Th/Ta and a wide range of La/Yb ratios;and the basic volcanics of the Yaolinghe Group have(^87Sr/^86Sr)i=0.6487-0.7075,εNd(t)=0.11-3.94，△^208Pb/^204Pb=-81.58-219.95,△^207Pb/^204Pb=4.44-16.68and higher Th/Ta and La/Yb ratios,indicating that their source is a mixture of DM and EMⅡ,and the basic volcanics of the Yaolinghe Group were contaminated by crust materials en rout to the surface.Based on the geochemical features of continental tholeiitic basalts and being products of differen tacies derived from the same source,it can be concluded that an important rifting event in the South Qinling basement block occurred during Neoproterozoic,followed by a setting of oceanic basic in the Early Paleozoic. |
| 关 键 词： | 锶同位素 钕同位素 铅同位素 氧同位素 原生代克拉通 秦岭造山带 |
Study on the Sr, Nd, Pb and O isotopes of basic dyke swarms in the Wudang block and basic volcanics of the Yaolinghe Group |
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| Authors: | Chengli Zhang Dingwu Zhou Hailong Jin Song Han Yinyu Liu |
| Institution: | 1. The Key Laboratory of Northwest University Continental Dynamics, Ministry of Education, 710069, Xi’an, China 2. Department of Geography, Xinjiang Normal University, 830054, ürümqi, China 3. Institute of High Energy Physics, Chinese Academy of Sciences, 100081, Beijing, China 4. Department of Geology, Northwest University, 710069, Xi’an, China |
| Abstract: | The Sr, Nd and Pb isotopic characteristics of the Wudang basic dyke swarms and basic volcanics of the Yaolinghe Group show that they were derived from the same multi-component mixing source in the mantle. The Wudang basic dyke swarms have (87Sr/86Sr)i = 0.6905 ～0.7061, εNd(t)=?1.9～5.0, Δ208Pb/204Pb = 35.49～190.26, Δ207Pb/204Pb = 4～85, low Th/Ta and a wide range of La/Yb ratios; and the basic volcanics of the Yaolinghe Group have (87Sr/86Sr)i = 0.6487～0.7075, εNd(t) = 0.11～3.94, Δ208Pb/204Pb=?81.58～219.95, Δ207Pb/204Pb = 4.44～16.68 and higher Th/Ta and La/Yb ratios, indicating that their source is a mixture of DM and EMII, and the basic volcanics of the Yaolinghe Group were contaminated by crust materials en rout to the surface. Based on the geochemical features of continental tholeiitic basalts and being products of different facies derived from the same source, it can be concluded that an important rifting event in the South Qinling basement block occurred during Neoproterozoic, followed by a setting of oceanic basin in the Early Paleozoic. |
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