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Petrogenesis of Shangyu gabbro-diorites in western Shandong: Geochronological and geochemical evidence

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Abstract

Chronology and geochemistry of the Shangyu gabbro-diorite in western Shandong were studied to understand their petrogenesis and the nature of the Mesozoic lithospheric mantle. The Shangyu intrusion is mainly composed of a suite of gabbro-diorite. Zircons from the intrusion display euhedral-subhedral in shape and have high Th/U ratios (1.23–2.87), implying their magmatic origin. LA-ICP-MS zircon U-Pb dating results for two samples indicate that they were formed in the Early Cretaceous, yielding weighted mean 206Pb/238U ages of 129±1Ma and 134±2Ma, respectively. Except for early cumulate such as sample QT-19, their SiO2 and MgO contents range from 50.12% to 56.37% and from 3.52% to 6.37%, respectively. Moreover, the gabbro-diorites are characterized by high Mg (0.54–0.63), enrichment in Na (Na2O/K2O ratios more than 1), Cr (73×10−6−217×10−6) and Ni (34×10−6−241×10−6), and intensive enrichments in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in high field strength elements (HFSEs). Their initial 87Sr/86Sr ratios and ɛ Nd(t) values range from 0.70962 to 0.71081 and from −16.60 to −13.04, respectively. Taken together with the Early Cretaceous high-Mg diorites and the mantle xenoliths from the Tietonggou and Jinling as well as basalts from the Fangcheng and Feixian, it is suggested that the primary magma for the Shangyu gabbro-diorites should be derived from the enriched lithospheric mantle intensively modified by continental crust. The Sr-Nd-Pb isotopic compositions for the Early Cretaceous high-Mg diorites in western Shandong display a trend of spatial variations, i.e., initial 87Sr/86Sr, 207Pb/204Pb and 208Pb/204Pb ratios decreasing and ɛ Nd(t) values increasing from southeast to northwest in western Shandong, which is consistent with the tectonic model that the Yangtze Craton subducted beneath the North China Craton oriented in north-west direction in the Early Mesozoic.

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Correspondence to WenLiang Xu.

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Supported by the National Natural Science Foundation of China (Grant No. 40472033) and the State Key Laboratory of Continental Dynamics, Northwest University

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Yang, C., Xu, W., Yang, D. et al. Petrogenesis of Shangyu gabbro-diorites in western Shandong: Geochronological and geochemical evidence. Sci. China Ser. D-Earth Sci. 51, 481–492 (2008). https://doi.org/10.1007/s11430-008-0029-0

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