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Origin of Cenozoic Lithospheric Mantle in Several Areas of Eastern China

Author: LiuHaiQuan
Tutor: ZuoJun；ShiYongHong
School: Hefei University of Technology
Course: Geochemistry
Keywords: Peridotite xenoliths Asthenosphere Trace elements Thinning North China Craton
CLC: P542.5
Type: Master's thesis
Year: 2010
Downloads: 57
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Abstract


The Hannuoba female Mountain, Panshishan and Fangshan Cenozoic basalt in the mantle peridotite xenoliths major and trace element geochemical characteristics, combined with mantle peridotite xenoliths data published, compared eastern Paleozoic peridotite xenoliths and Cenozoic peridotite xenoliths from the oceanic mantle, ancient craton geochemical properties. Cenozoic peridotite xenoliths main elements have characteristics similar oceanic mantle peridotite mantle enrichment with the ancient craton and the Paleozoic lithospheric refractory mantle with a significant difference. Partial melting of analog indication of further primary - trace elements, ancient craton require a higher degree of partial melting (~ 15%), while the Cenozoic lithospheric mantle and oceanic mantle peridotite melting degree is relatively small, you can DMM after separation of partial melting of a lesser extent (~ 5%), although the female Hill and Panshishan of individual samples with a considerable degree of partial melting of ancient craton, but the isotope evidence indicating the female mountain Panshishan all samples are loss characteristics, not ancient lithospheric mantle residue. And eastern China Paleozoic lithospheric mantle spider diagrams extreme Ti negative anomalies compared to the Hannuoba female mountain Panshishan Fangshan samples and ocean mantle peridotite xenoliths weak Ti negative anomalies, weak negative anomalies DMM similar combination Paleozoic enriched mantle the simulation account by the various properties of the melt, the to exclude Cenozoic lithospheric mantle inherited from ancient craton lithospheric mantle possibility. After experiencing a lower degree of separation degree of partial melting, REE distribution patterns of the characteristics of the light rare earth losses, but the explanation of similar the OIB nature melt the Hannuoba female mountain, most of Panshishan Fangshan samples \inverted spoon type and LREE shape REE patterns. account the nature of the medium with a silicon-rich. Melt of samples accountable Hannuoba more strongly, petrographic evidence, concentration of major and trace element patterns the relationship table Ming Hannuo dam Cenozoic lithospheric mantle experienced rich silicon Melt Ol (olivine) → Opx (oblique The Melt the reaction procedure) silicon-poor roxene, this process led directly to Nb and U enrichment. Female mountain Panshishan Fangshan lithospheric mantle mainly experienced recessive metasomatic processes. Based on published data, mineral equilibrium temperature indicates lithospheric mantle has a certain heterogeneity, specific performance of the central high, while the north and south sides of the lower.

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CLC: > Astronomy,Earth Sciences > Geology > Structural Geology > Tectonic movement > Deep structure , the deep geological
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