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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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Acta Geologica Sinica(English Edition) 2000年第4期74卷 774-780页

作者： YAN Guohan XU Baoliang MU Baolei WANG Guanyu CHANG Zhaoshan CHEN Tingli ZHAO Yongchao WANG Xiaofang ZHANG Renhu QIAO Guangsheng CHU Zhuyin Department of Geology Peking UniversityBeijing 100871 Institute of Geology Chinese Academy of SciencesBeijing 100029

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 of the alkaline intrusives in the south section have a close connection to materials from the enriched mantle reservoir, while those in the north are related to materials from the depleted one, but also reveal that the upper mantle below the North China platform is enriched and that below the Inner Mongolia geosyncline is depleted.

关键词： alkaline intrusives chronology Sr Nd and Pb isotopes east foot of the taihang-da hinggan mountains

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