globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-014-1065-y
Scopus记录号: 2-s2.0-84945282498
论文题名:
Depletion, cryptic metasomatism, and modal metasomatism of central European lithospheric mantle: evidence from elemental and Li isotope compositions of spinel peridotite xenoliths, Kozákov volcano, Czech Republic
作者: Medaris L.G.; Jr.; Ackerman L.; Jelínek E.; Magna T.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期:8
起始页码: 1925
结束页码: 1956
语种: 英语
英文关键词: Central European lithospheric mantle ; Geochemistry ; Geothermometry ; Li isotopes ; Spinel peridotite xenoliths
Scopus关键词: geothermometry ; igneous geochemistry ; isotopic composition ; lithium ; lithospheric structure ; metasomatism ; Moho ; peridotite ; rare earth element ; xenolith ; Central Europe
英文摘要: Spinel peridotite xenoliths in 4.1 Ma basanite lava at Kozákov volcano vary in equilibration temperature from 675 to 1,135 °C and provide a continuous sample of lithospheric mantle from the Moho to a depth of ~82 km. The sub-Kozákov mantle is layered, consisting of an upper equigranular layer (UEL) from 32 to 45 km, an intermediate protogranular layer (PGL) from 45 to 66 km, and a lower equigranular layer (LEL) below 66 km. Relative to primitive mantle, all three layers are depleted in major incompatible elements and heavy rare earth elements, with the UEL being most depleted among the three layers, consisting of harzburgite and having experienced >15 % fractional melting. In contrast, the PGL and LEL experienced <10–15 % melting and consist of lherzolite; the PGL and LEL overlap in major element composition, with the PGL displaying a decreasing degree of depletion with depth. Subsequent metasomatism by silicate melt led to cryptic enrichments in large-ion lithophile elements, light REE, and high field strength elements over all the layers and, locally, modal enrichment in orthopyroxene. Metasomatism is accompanied by elevated whole-rock Li contents (1.2–3.6 ppm) and isotopically light δ7Li (−0.8 to −5.8 ‰). Lithium contents and δ7Li show no strong correlation with rock type or depth, although values of δ7Li are <−3.0 ‰ in the PGL and >−3.5 ‰ in the UEL and LEL. The layered structure and geochemical characteristics of sub-Kozákov lithospheric mantle are the product of Variscan or pre-Variscan melting, Variscan tectonics, and Neogene volcanism and metasomatism. © 2014, Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945282498&doi=10.1007%2fs00531-014-1065-y&partnerID=40&md5=6b726323e68604791e99f0c3c2a3d8df
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70241
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; Institute of Geology v.v.i., Academy of Sciences of the Czech Republic, Prague, Czech Republic; Institute of Geochemistry, Mineralogy, and Mineral Resources, Charles University, Prague, Czech Republic; Czech Geological Survey, Prague, Czech Republic

Recommended Citation:
Medaris L.G.,Jr.,Ackerman L.,et al. Depletion, cryptic metasomatism, and modal metasomatism of central European lithospheric mantle: evidence from elemental and Li isotope compositions of spinel peridotite xenoliths, Kozákov volcano, Czech Republic[J]. International Journal of Earth Sciences,2015-01-01,104(8)
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