Abstract
Paleozoic lithospheric mantle with complex composition and structure relative to Cenozoic mantle beneath eastern part of North China underwent much more complex multi-circles and/or multi-stages history about magmatism, recrystallization, metamorphism and deformation. The concentrations of major elements in mantle peridotites, the Mg(⇆) values and Cr(⇆) values of mantle minerals especially from the inclusions in diamonds show the characters with high depletion in basaltic composition, whereas the concentrations of incompatible elements and isotopes show high enrichment nature on Paleozoic lithospheric mantle. The dihedral qualities of high depletion in basalt component and high enrichment in incompatible elements and isotopes are the mantle characters of craton lithosphere. The Pb isotopes of all the mantle xenoliths from Paleozoic kimberlite may reflect their Gondwana inheritance. Although both are Archean in Fuxian (Liaoning province) and Mengyin (Shandong province) lithospheric mantle, the heterogeneity is present, that is, the influence of post-craton by mantle processes in the former is stronger than that in the later. The comparison with Sr and Nd isotopes of Cenozoic mantle shows that the transition and thinning from Paleozoic enriched lithospheric mantle to Cenozoic depleted mantle were accompanied by the replacement and contamination of paleo-lithospheric mantle by newly accreted mantle materials.
| Translated title of the contribution | Mantle xenoliths from kimberlites, Shandong and Liaoning: Paleozoic mantle character and its heterogeneity |
|---|---|
| Original language | Chinese |
| Pages (from-to) | 65-74 |
| Number of pages | 10 |
| Journal | Acta Petrologica Sinica |
| Volume | 15 |
| Issue number | 1 |
| Publication status | Published - 1999 |
| Externally published | Yes |
Keywords
- China
- Heterogeneity
- Liaoning and Shandong peninsula
- Mantle xenolith
- Paleozoic
- Subcontinental lithospheric mantle