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- W2391204003 abstract "Two piece of serpentinized garnet peridotite mantle xenoliths with sheared-deformation texture entrained in kimberlite from Mengyin have been studied in this paper. Three kinds of pyroxenes represented three geological events of lithospheric mantle are recognized. From early to late they are:(1) euhedral diopsite (Py) inclusions in garnet; (2) irregular coarse grain enstatites (Py1); (3) orientated tabular enstatites with reaction rim (Py2). Py have relative high Na2O,Al2O3,and low Mg#(0.91),CaO,implying that Py and the host mantle peridotite have not been undergone the stronger melting events during that time. It is possible that the Py was the crystallized products from magma sea in initial stage of mantle evolution. Py2 cutting across Py1 occur in hand specimen and thin section indicating that Py1 formed early then Py2. Py1s have higher Cr (669×10-6~9503×10-6),Ni (1941×10-6~4750×10-6) contents and Mg# ratio (0.91~0.94),however the Cr (725×10-6~1926×10-6),Ni (902×10-6~2989×10-6) and Mg# ratio (0.88~0.90) in Py2s are lower then that in Py1s showing the Py1 with an origin as a refractory residue of partial melting. In contrast,Py2s are the reaction products of refractory mantle peridotite-melt which derived from asthenosphere. The sheared/deformation and metasomatized events were happened after or as same as the reaction event. In terms of major element,the refractory degrees of Py1s are higher than that of Py2s. In this paper reverse trend of mantle component is called. It may be possible that the peridotite-melt reaction not only occur in Mesozoic-Cenozoic but also in ancient lithospheric mantle even in whole mantle evolution history. Compared with published data for ages relative to mantle,the ages of Py,Py1s and Py2s may have estimably3.8Ga,2.5Ga/1.4~1.3Ga,and 0.9~0.7Ga respectively. The age of another carbonated peridotite xenolith with sheared/deformation texture sampled from Fuxian kimberlite may be as same as Py2." @default.
- W2391204003 created "2016-06-24" @default.
- W2391204003 creator A5031854755 @default.
- W2391204003 date "2010-01-01" @default.
- W2391204003 modified "2023-09-23" @default.
- W2391204003 title "Multiple-geological events of ancient lithospheric mantle beneath North China craton:As inferred from peridotite xenoliths in kimberlite" @default.
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