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Discovery of dunite and pyroxenite xenoliths in Mesozoic diorite at Jinling, western Shandong and its significance

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Chinese Science Bulletin

Abstract

Abundant deeply-derived xenoliths are discovered in a Mesozoic diorite at Jinling, Zibo, western Shandong, which mainly consist of dunite and pyroxenite. The dunite can be further subdivided into two subtypes. The first type shows tabular texture and high Mg# values (93–94) in olivines. The second type is characterized by the metamorphic-deformation texture superimposed by later metasomatism and relatively low olivine Mg# values (86–87). The mineral chemical data indicate that the former could be derived from ancient lithospheric mantle and the latter could have resulted from silica-rich melt metasomatism. The exsolution texture and the high Mg# value in clinopyroxenes, together with the rather high equilibrium temperature, imply that the pyroxenite xenoliths could be the cumulates of mantle-derived magma in the uppermost mantle or near the crust-mantle boundary in the Mesozoic.

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Authors and Affiliations

  1. College of Earth Sciences, Jilin University, 130061, Changchun, China

    Wenliang Xu, Dongyan Wang & Jingqian Lin

  2. The Key Laboratory of Continental Dynamics, Northwestern University, 710069, Xi’an, China

    Shan Gao

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  1. Wenliang Xu
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  2. Dongyan Wang
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  3. Shan Gao
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  4. Jingqian Lin
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Correspondence to Wenliang Xu.

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Xu, W., Wang, D., Gao, S. et al. Discovery of dunite and pyroxenite xenoliths in Mesozoic diorite at Jinling, western Shandong and its significance. Chin. Sci. Bull. 48, 1599–1604 (2003). https://doi.org/10.1007/BF03183968

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  • DOI: https://doi.org/10.1007/BF03183968

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