Isotopic Compositions of the Peridotitic Xenoliths from the
详细信息
- 责任者：Liu Zhichao (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Wu Fuyuan
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(4)
- 关键词：橄榄岩 ; peridotites ; 同位素组成 ; isotope composition ; 安徽 ; Anhui Province
- 页码：p.1217-1240
- 图表：illus., 12 tables, 109 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Nushan volcano, located in Anhui Province, contains abundant and various mantle-derived peridotitic xenoliths. Some spinel lherzolites contain amphibole, phlogopite and apatite, indicating that they had experienced mantle metasomatism. Petrological, mineralogical and geochemical data of the spinel lherzolites and harzbuigites revealed that the former are fertile and the latter are refractory. Depleted Sr-Nd -Hf isotopic characteristics of the spinel lherzolites indicate that they are typical of oceanic peridotites, rather than of Archean lithospheric mantle. Although the lithospheric mantle beneath the Nushan are has been strongly metasomatismed by fluids/melts, the Os isotopes and PGE(Platinum Group Element) data display that the Os isotopic composition of the Nushan peridotites are not significantly affected by later mantle metasomatism processes. All these geochemical data of most spinel lherzolites indicate that the lithospheric mantle beneath Nushan are young (Phanerozoic) additions to the subcontinental lithospheric mantle(SCLM) from the convective asthenospheric mantle.
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