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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The age of deep, steep continental subduction in the NW Himalaya: Relating zircon growth to metamorphic history. Comment on: 'The onset of India-Asia continental collision: Early, steep subduction required by the timing of UHP metamorphism in the wes
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The age of deep, steep continental subduction in the NW Himalaya: Relating zircon growth to metamorphic history. Comment on: 'The onset of India-Asia continental collision: Early, steep subduction required by the timing of UHP metamorphism in the wes

机译：喜马拉雅山西北部深而陡峭的大陆俯冲时代：将锆石的生长与变质历史联系起来。评论：“印度-亚洲大陆碰撞的发生：在西澳大利亚，UHP变质的时间要求早期，陡峭俯冲。

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Leech et al. [Mary L. Leech, S. Singh, A.K. Jain, Simon L. Klemperer and R.M. Manickavasagam, Earth and Planetary Science Letters 234 (2005) 83-97], present 3 clusters of ages for growth stages in zircon from quartzo-feldspathic gneisses hosting coesite-bearing eclogite from the Tso Morari Complex, NW India. These age clusters, from oldest to youngest, are interpreted to represent the age of ultrahigh-pressure metamorphism, a subsequent eclogite facies overprint and a later amphibolite facies retrogression and require subduction of Indian crust to have started earlier than previously accepted. However, no petrographic evidence, such as inclusions in the zircons relating to particular metamorphic events, is presented to substantiate the proposed sequence of metamorphic stages. Previously published data from eclogites of the same area indicate that coesite-eclogite is not the first but at least the second eclogite facies stage. In addition, the newly proposed time interval between coesite-eclogite and the amphibolite facies overprint is longer than previously indicated by diffusion modelling of natural garnet-garnet couples in eclogite. Neither the age of ultrahigh-pressure metamorphism nor the timing of initiation of subduction is reliably constrained by the presented data. (c) 2006 Elsevier B.V. All rights reserved.
机译：Leech等。 [Mary L. Leech，S. Singh，A.K. Jain，Simon L.Klemperer和R.M. Manickavasagam，地球与行星科学快报234（2005）83-97]提出了3个年龄段的锆石，分别来自印度西北部Tso Morari综合体中的石英长石片麻岩，这些石英长石片麻岩中携带着带矾土的榴辉岩。这些年龄簇，从最老到最年轻，被解释为代表超高压变质的年龄，随后的榴辉岩相叠印以及后来的角闪岩相倒退，并要求俯冲印度地壳的开始早于先前的接受。然而，没有岩石学证据，例如与特定变质事件有关的锆石中的包裹物，来证实所提出的变质阶段序列。先前从同一地区的榴辉岩发布的数据表明，堇青石-榴辉岩不是第一个，而是至少第二个榴辉岩相阶段。另外，新提出的堇青石-榴辉岩与角闪石相叠印之间的时间间隔比以前天然榴石-石榴石对在榴辉岩中的扩散模型所表明的更长。超高压变质的年龄和俯冲开始的时间都不受所提供数据的可靠限制。 （c）2006 Elsevier B.V.保留所有权利。

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