鲁西中、新生代镁铁质岩浆作用与地幔化学演化

邱检生; 胡建; 蒋少涌; 王汝成; 徐夕生

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 646-658

QIU Jian-sheng, HU Jian, JIANG Shao-yong, WANG Ru-cheng, XU Xi-sheng, 2005. Mesozoic-Cenozoic Mafic Magmatism in Western Shandong Province and Its Implication for the Chemical Evolution of the Mantle. Earth Science, 30(6): 646-658.

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Mesozoic-Cenozoic Mafic Magmatism in Western Shandong Province and Its Implication for the Chemical Evolution of the Mantle

State Key Laboratory of Mineral Deposits Research, Nanjing University, Nanjing 210093, China

Received Date: 2005-05-23
Publish Date: 2005-11-25

Abstract

Abstract

Mafic igneous rock, a widely distributed and typical mantle-derived rock, has become a major research source for revealing possible mechanisms for the chemical evolution of the mantle. Combined geological and geochemical studies have been carried out on the Mesozoic and Cenozoic mafic igneous rocks in western Shandong Province, determining the elemental and isotopic compositions of typical samples. Generally, the Mesozoic mafic igneous rocks have enriched LREE and LILE concentrations, low HFSE abundance, and display highly variable I_Sr ratios (0.703 96-0.712 47) and distinctly negative ε_Nd (t) values (-9.20 to -21.21). Compared to the north of western Shandong Province, the Mesozoic mafic rocks in the south have higher total REE contents (ΣREE=325.52×10^-6-555.75×10^-6), higher LREE/HREE ratios (17.75-25.97), and higher LILE/HFSE ratios (e. g., La/Nb=6.37-13.85, Th/Nb=0.52-1.53). They also have more radiogenic Sr isotopic compositions, with I_Sr values of 0.708 44-0.712 47 and 0.703 96-0.705 98, respectively. Integrated elemental and isotopic tracing suggest that the Mesozoic mantle of western Shandong Province is generally characterized by the EMⅠ component, which was probably formed by large-scale lithospheric delamination, whereas the mantle source in the south part has been superimposed by the influence of the deep subducted Yangtze continental materials, and thus displays the mixed features of EMⅠ and EMⅡ components. The geochemical characteristics of the Cenozoic basalts are similar to those of the oceanic basalts. It is likely that the rocks were derived from a depleted asthenosphere source but underwent metasomatism shortly before partial melting. From the Mesozoic to the Cenozoic, the nature of the mantle beneath the North China craton evolved from an enriched one to a depleted one. This chemical evolution most likely resulted from an asthenosphere upwelling, which was induced by large-scale lithospheric delamination and thus replaced the original lithospheric mantle with a newly created one.
- mafic igneous rock,
- geochemistry,
- source tracing,
- mantle chemical evolution,
- western Shandong Province

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Mesozoic-Cenozoic Mafic Magmatism in Western Shandong Province and Its Implication for the Chemical Evolution of the Mantle

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