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首页> 外文期刊>Contributions to Mineralogy and Petrology >Li abundances in eclogite minerals: a clue to a crustal or mantle origin?
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Li abundances in eclogite minerals: a clue to a crustal or mantle origin?

机译：李在榴辉岩矿物中含量丰富：是地壳还是地幔起源的线索？

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摘要

The mineral phases of 33 eclogite and garnet clinopyroxenite samples from various tectonic settings were analysed for Li by secondary ion mass spectrometry (SIMS). In all samples, Li is preferentially incorporated into clinopyroxene (0.4 to 80 µg/g), whereas co-existing garnet contains only minor amounts of Li (0.01 to 3.7 µg/g). When present, glaucophane shows Li abundances which are similar to those of clinopyroxene, but phengite contains significantly less Li than clinopyroxene. Additional phases, such as amphibole, quartz, clinozoisite and kyanite, have low Li concentrations (<1 µg/g). No correlation is apparent between the Li contents and major-element compositions of clinopyroxene or garnet. On the basis of both measured Li concentrations in clinopyroxene and estimated Li abundances in the whole rocks, the investigated samples can be subdivided into high-Li and low-Li groups. These groups coincide with the mode of origin of the rocks. Metabasaltic (metagabbroic) eclogites from high-pressure terranes belong to the high-Li group whereas, except for one eclogite, all kimberlite- and basanite-hosted xenoliths have low Li contents. Samples from eclogites and garnet clinopyroxenites associated with orogenic peridotites fall into both groups. It is suggested that the high-Li eclogites originated from basaltic oceanic crust whereby the notable Li enrichment of some samples was probably caused by low-temperature hydrothermal alteration prior to subduction. Furthermore, the low-Li eclogites and garnet clinopyroxenites may represent high-pressure cumulates from mafic melts percolating through the mantle.
机译：通过二次离子质谱（SIMS）分析了来自不同构造背景的33个榴辉岩和石榴石斜辉石样品的矿物相中的锂。在所有样品中，Li都优先掺入环吡咯（0.4至80 µg / g）中，而共存的石榴石仅包含少量Li（0.01至3.7 µg / g）。当存在时，葡甲环烷显示出与clinopyroxene相似的锂丰度，但与辉石岩相比，pengite的Li含量要少得多。其他相（如闪石，石英，斜长石和蓝晶石）的锂浓度较低（<1 µg / g）。 Li含量与斜柏基或石榴石的主要元素组成之间没有明显的相关性。根据测得的斜滨辉石中的Li浓度和整个岩石中的Li丰度估计值，可以将研究样品分为高Li和低Li组。这些组与岩石的起源方式相吻合。高压地层中的准玄武（变质）榴辉岩属于高锂族，而除了一种榴辉岩外，所有由金伯利岩和玄武岩包裹的异岩都具有低的锂含量。与造山橄榄石有关的榴辉岩和石榴石斜辉石岩样品均属于两组。推测高锂榴辉岩起源于玄武质洋壳，其中某些样品的显着锂富集可能是由俯冲前的低温热液蚀变引起的。此外，低锂榴辉岩和石榴石斜辉石可能代表渗透到地幔的镁铁质熔体的高压堆积物。

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  • 来源
    《Contributions to Mineralogy and Petrology》 |2002年第5期|587-601|共15页
  • 作者

    Alan B. Woodland; Hans-Michael Seitz; Rainer Altherr; Horst Marschall; Bettina Olker; Thomas Ludwig;

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    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

    Mineralogisches Institut Universität Heidelberg Im Neuenheimer Feld 236 69120 Heidelberg Germany;

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