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Volume 21 Issue 5
Oct 2010
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Journal of Earth Science  > 2010  >  21(5): 669-691.
Yongsheng LIU, Shan GAO, Changgui GAO, Keqing ZONG, Zhaochu HU, Wenli LING. Garnet-Rich Granulite Xenoliths from the Hannuoba Basalts, North China: Petrogenesis and Implications for the Mesozoic Crust-Mantle Interaction. Journal of Earth Science, 2010, 21(5): 669-691. doi: 10.1007/s12583-010-0125-x
Citation: Yongsheng LIU, Shan GAO, Changgui GAO, Keqing ZONG, Zhaochu HU, Wenli LING. Garnet-Rich Granulite Xenoliths from the Hannuoba Basalts, North China: Petrogenesis and Implications for the Mesozoic Crust-Mantle Interaction. Journal of Earth Science, 2010, 21(5): 669-691. doi: 10.1007/s12583-010-0125-x
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Garnet-Rich Granulite Xenoliths from the Hannuoba Basalts, North China: Petrogenesis and Implications for the Mesozoic Crust-Mantle Interaction

doi: 10.1007/s12583-010-0125-x
  • 1.

    State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

  • 2.

    State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China

Funds:

the National Natural Science Foundation of China 90914007

the National Natural Science Foundation of China 40821061

the National Natural Science Foundation of China 90714010

the State Administration of Foreign Expert Affairs of China B07039

the MOST Special Fund of State Key Laboratory of Geological Processes and Mineral Resources and State Key Laboratory of Continental Dynamics 

the Special Fund For Basic Scientific Research of Central Colleges, China University of Geosciences (Wuhan) 

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  • Corresponding author: Liu Yongsheng, yshliu@cug.edu.cn
  • Received Date: 04 Apr 2010
  • Accepted Date: 10 May 2010
  • Publish Date: 01 Oct 2010
    Abstract
  • Garnet-rich granulite xenoliths collected from the Hannuoba basalts, the North China craton (NCC), were studied to reveal the Mesozoic crust-mantle interaction. These xenoliths are characterized by low SiO2 (37.7 wt.%-46.0 wt.%) and high Al2O3 (10.8 wt.%-17.9 wt.%) contents. Their Mg# (60-75, Mg#=100×Mg/(Mg+Fe), atomic number) are relatively low for their low SiO2 contents. They have low rare-earth element (REE) contents and LREE-rich REE patterns, and show remarkable enrichments in Sr relative to the adjacent REE. Some of them exhibit convex REE patterns with a maximum at Nd and remarkably positive Eu anomalies. Taking into account their high garnet mode (generally > 30%), these features suggest that they are high-pressure metamorphic products of low-pressure cumulates (e.g., gabbro) after it had been depressed into the garnet stability field. They have evolved Nd and Sr isotopic compositions (143Nd/144Nd=0.511 763-0.512 173, 87Sr/86Sr=0.705 34-0.706 99) and fall in the trend defined by the > 110 Ma Mesozoic basalts and high-Mg# andesites from the NCC. Zircon U-Pb dating by LA-ICP-MS shows a wide age range from 83 to 2 581 Ma, most of which cluster in 83-134 Ma. CL images of some Mesozoic zircons from the granulites show typical features of igneous zircons, providing direct evidence for the Mesozoic underplating event in this area. Neither peridotite-derived basaltic underplating model nor residue model of ancient lower crust after lithospheric thinning alone can reasonably explain the above features of the garnet-rich granulite xenoliths. Combined with the previous research, we propose that most of the granulite xenoliths from the Hannuoba basalts are products of the Mesozoic magmatic underplating and mixing with the pre-existing lower crust (i.e., AFC process). However, the melts could be mostly derived from partial melting of basaltic layers that were previously subducted (a fossil oceanic slab) or underplated into the base of the lithospheric mantle, or from partial melting of Archean lithospheric mantle that was variably hybridised by melts derived from foundered lower crustal eclogite, although it cannot be excluded that some of the melts were derived from depleted mantle peridotite. In other words, parent melts of most granulite xenoliths could share the same petrogenesis as the > 110 Ma Mesozoic basalts from the NCC.

     

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