Alkaline Intrusives at the East Foot of the Taihang-Da Hinggan Mountains:Chronology,Sr,Nd and Pb Isotopic Characteristics and Their Implications

查看全文 作　　者：YAN [1]Guohan;XU [1]Baoliang;MU [1]Baolei;WANG [1]Guanyu;CHANG [1]Zhaoshan;CHEN [1]Tingli;ZHAO [1]Yongchao;WANG [1]Xiaofang;ZHANG [2]Renhu;QIAO [2]Guangsheng;CHU [2]Zhuyin

机构地区：[1]Department of Geology,Peking University,Beijing 100871;[2]Institute of Geology,Chinese Academy of Sciences,Beijing 100029

出　　处：《Acta Geologica Sinica(English Edition)》索引2000年第74卷第4期,共7页

摘　　要：Based on the Rb-Sr isochron dating results, this paper suggests that the alkaline intrusive belt at the east foot of the Taihang-Da Hinggan Mountains were formed between 135 and 122 Ma. And the alkaline intrusives in the north and south sections of this belt have entirely different Sr, Nd and Pb isotopic characteristics, i.e., all the rocks in the south section have positive εSr(t) and negative εNd(t) values and all those in the north have the opposite values. On the εSr(t) versus εNd(t) correlation diagram, the samples from the south are concentrated along the enriched mantle evolution trend lines and nearby, while those from the north fall along the depleted mantle trend lines and nearby. On the Pb isotope composition diagram, most of the samples from the south section fall on the mantle Pb evolution line and nearby, while those from the north lie between the Pb evolution lines of the mantle and the erogenic belt. The above-stated isotopic characteristics not only indicate that the source rocks 关键词：alkaline intrusives CHRONOLOGY SR Nd and Pb isotopes east foot of the Taihang-Da Hinggan Mountains

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Alkaline Intrusives at the East Foot of the Taihang-Da Hinggan Mountains:Chronology,Sr,Nd and Pb Isotopic Characteristics and Their Implications

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