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首页> 外文期刊>Lithos: An International Journal of Mineralogy, Petrology, and Geochemistry >Depletion, cryptic metasomatism, and modal metasomatism (refertilization) of Variscan lithospheric mantle: Evidence from major elements, trace elements, and Sr-Nd-Os isotopes in a Saxothuringian garnet peridotite
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Depletion, cryptic metasomatism, and modal metasomatism (refertilization) of Variscan lithospheric mantle: Evidence from major elements, trace elements, and Sr-Nd-Os isotopes in a Saxothuringian garnet peridotite

机译：瓦里斯坎岩石圈地幔的耗竭，隐性交代和模态交代（指代）：萨克斯图林型石榴石橄榄石中主要元素，微量元素和Sr-Nd-Os同位素的证据

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摘要

Orogenic garnet peridotites of diverse origins and histories in the Bohemian Massif attest to a variety of mantle processes, including partial melting, cryptic metasomatism, and modal metasomatism (refertilization), all of which are recorded by Saxothuringian garnet peridotite from the T-7 borehole in northern Bohemia. The T-7 peridotite consists of interlayered garnet lherzolite, harzburgite, and phlogopite-garnet pyroxenite lenses that yield peak temperatures and pressures of 1030-1150 degrees C and 36.1-48.0 kbar. Olivine crystallographic preferred orientations exhibit [axial](010) slip, corresponding to a pure shear component of deformation under relatively low flow stress conditions. Some Iherzolite samples are fertile, resembling primitive mantle in major and trace element composition, but other Iherzolites are slightly depleted in incompatible major elements, HREE, and HFSE, and slightly enriched in LREE. Harzburgite is depleted in incompatible major elements, HREE, and HFSE, but enriched in LREE. Harzburgite adjacent to pyroxenite has been refertilized, containing phlogopite, less olivine, more orthopyroxene, and more garnet than distal harzburgite. The T-7 peridotite compositions are the result of variable degrees of partial melting in the spinel stability field, followed by cryptic metasomatism and modal metasomatism by transient basaltic melts in the garnet field. Trace elements, Sr and Nd isotopes, and occurrence of phlogopite reflect a subduction component in the metasomatising melts. Partial melting of the T-7 peridotite was a Proterozoic event, as indicated by Rhenium depletion model ages (T-RD); the age of cryptic and modal metasomatism is unconstrained, but is thought to be related to Variscan subduction and amalgamation of the Bohemian Massif. (C) 2014 Elsevier B.V. All rights reserved.
机译：波西米亚地块的起源和历史各异的造山石榴石橄榄石证实了各种地幔过程，包括部分熔融，隐性交代作用和模态交代作用（指代作用），萨克斯图林根石榴石橄榄石来自T-7井孔记录了所有这些北波希米亚。 T-7橄榄岩由夹层的石榴石绿铁矿，钙锰矿和金云母-石榴石热解辉石透镜组成，其峰值温度和压力为1030-1150摄氏度和36.1-48.0 kbar。橄榄石晶体学优选的取向表现出[轴向]（010）滑动，其对应于在相对较低的流动应力条件下的纯剪切变形分量。一些Iherzolite样品很肥沃，主要元素和微量元素组成类似于原始地幔，但是其他Iherzolites的主要元素HREE和HFSE不相容的含量略有减少，而LREE的含量却略有丰富。 Harzburgite的主要元素HREE和HFSE不相容，但富含LREE。与远辉石相比，辉石岩附近的Harzburgite已被转化，其含有金云母，更少的橄榄石，更多的邻辉石和更多的石榴石。 T-7橄榄岩成分是尖晶石稳定性场中不同程度的部分熔化程度的结果，其次是石榴石场中瞬态玄武质熔体的隐性交代作用和模态交代作用。微量元素，Sr和Nd同位素以及金云母的出现反映了交代熔体中的俯冲成分。 T-7橄榄岩的部分融化是元古代事件，如de耗尽模型时代（T-RD）所表明。隐性和模态交代作用的年龄不受限制，但被认为与波西米亚断层的瓦里斯坎俯冲和合并有关。 （C）2014 Elsevier B.V.保留所有权利。

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