承德三岔口基性岩墙地球化学特征及地质意义

Abstract

Abstract: Zircon LA-ICP-MS U-Pb dating and geochemical analysis have been carried on the mafic dyke from Sanchakou area，Hebei Province. The isotopic dating results indicate mafic dykes, with the age of （222.1 ± 1.6) Ma, were resulted from the Late Indosinian magmatism. Geochemical characteristics indicate they belong to tholeiite basalt, rich in LREE and LILE, as well as obviously depleted in Nb , Ta and Ti. Moreover, Sr-Nd isotopic composition means that the mafic dyke has high initial ⁸⁷Sr/⁸⁶Sr ratios and negative ε_Nd(t) (from-9.3 to -6.1). As it mentioned above, it’s implied that the studied mafic dyke was derived from enriched lithospheric mantle. The Chronology, geochemisty and previous studies suggest that the Early Mesozoic intrusion zone coexistent with mafic dykes in Sanchakou area, in northern North China block, might be formed in the early period of lithospheric thinning.

Key words: zircon U-Pb age, geochemistry, Sr-Nd isotopic compositions, mafic dyke, petrogenesis, Chengde

CLC Number:

P595

Yang Yu-hong，Liu Shen，Hu Rui-zhong，Feng Cai-xia，Feng Guang-ying， Yang Chao-gui， Qi You-qiang. Geochemistry and Petrogenesis of the Sanchakou Maifc Dyke in Chengde，Hebei Province, China[J].Journal of Jilin University(Earth Science Edition), 2012, 42(6): 1796-1805.

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Geochemistry and Petrogenesis of the Sanchakou Maifc Dyke in Chengde，Hebei Province, China

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