Clinopyroxenes from metasomatized spinel-peridotite mantle xenoliths from Nemby (Paraguay): crystal chemistry and petrological implications

被引：0
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作者：
F. Princivalle
M. Tirone
P. Comin-Chiaramonti
机构：
[1]  Dipartimento di Scienze della Terra (DST),
[2] University of Trieste,undefined
[3] Trieste,undefined
[4] Italy,undefined
[5]  Department of Geosciences,undefined
[6] University of Arizona,undefined
[7] Gould-Simpson Building,undefined
[8] Tucson,undefined
[9] AZ,undefined
[10] USA,undefined
[11]  Dipartimento di Ingegneria Chimica,undefined
[12] dell’Ambiente e delle Materie Prime (DICAMP),undefined
[13] University of Trieste,undefined
[14] Trieste,undefined
[15] Italy,undefined
来源：
Mineralogy and Petrology | 2000年 / 70卷
关键词：
Pressure Range; Compositional Variation; Lithospheric Mantle; Crystal Chemistry; Equilibration Pressure;
D O I：
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学科分类号：
摘要：
The Nemby mantle xenoliths are represented by spinel peridotites variably affected by “metasomatic processes” in Proterozoic times (1.2–0.5 Ga). Clinopyroxene compositional variations mainly reflect variably degrees of basalt extraction and mantle “metasomatic processes”. Clinopyroxene crystal chemistry allows to estimate the equilibration pressure by V(Cell) and V(M1) relationship. The investigated clinopyroxenes yielded a pressure range of 12–18 kb. Therefore, the Nemby xenoliths are representative of about 20 km thickness of subcontinental lithospheric mantle of the South America platform at Tertiary times (ca. 46 Ma).
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页码：25 / 35
页数：10
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