Geochemical behaviours of chemical elements during subduction-zone metamorphism and geodynamic significance
Geochemical behaviours of chemical elements during subduction-zone metamorphism and geodynamic significance
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俯冲带变质作用过程中化学元素的地球化学行为及地球动力学意义
DOI：
10.1080/00206814.2016.1147987
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发表时间：
2016-02
影响因子：
2.6
通讯作者：
Iizuka, Yoshiyuki
中科院分区：
文献类型：
--
作者：
Niu, Yaoling;Wang, Kuo-Lung;Lee, Der-Chuen;Iizuka, Yoshiyuki
海底俯冲和俯冲带变质作用（SZM）被认为是俯冲带岩浆活动和地幔成分非均质性的根本原因。本文对全球古俯冲带（包括中国西天山超高压变质带）蓝片岩和榴辉岩相岩的地球化学资料进行了整理。本文综合了我们对俯冲带变质作用中化学元素行为及其控制的最新认识。虽然最近有报道称俯冲岩中变质矿物的组成不均匀性，但我们强调矿物组成不均匀性受矿物生长过程中元素有效性的控制，受原岩组成、前体矿物的遗传组成以及与邻近生长矿物的竞争的影响。此外，考虑到不同的原岩组成和变质条件对元素行为的可能影响，我们将全球古俯冲带不同变质条件下的元基性岩按其原岩组成（即洋岛玄武岩（OIB）类、富集海中脊玄武岩（MORB）类、正常[N]-MORB类）进行了分类。并讨论化学元素在这些共发生群体中的地球化学行为，而不是简单地接受文献中的结论。本文还讨论了SZM的地球化学后果及其对化学地球动力学的影响，并重点提出：(1)传统上接受的“流体通量诱发熔融”的弧岩浆作用模型需要修正；(2)残余俯冲洋壳虽对深部地幔成分的非均质性有贡献，但不能作为OIB的主要来源。本文还提出了一些需要进一步研究的重要问题，如复杂的俯冲带地球化学过程、海底俯冲和陆相物质俯冲的不同贡献以及所研究的HP-UHP变质岩的代表性等。
ABSTRACT Seafloor subduction and subduction-zone metamorphism (SZM) are understood to be the very cause of both subduction-zone magmatism and mantle compositional heterogeneity. In this article, we compile geochemical data for blueschist and eclogite facies rocks from global palaeo-subduction-zones in the literature, including those from the Chinese Western Tianshan ultrahigh pressure (UHP) metamorphic belt. We synthesize our up-to-date understanding on how chemical elements behave and their controls during subduction-zone metamorphism. Although the compositional heterogeneity of metamorphic minerals from subducted rocks has been recently reported, we emphasize that the mineral compositional heterogeneity is controlled by elemental availability during mineral growth, which is affected by the protolith composition, the inherited composition of precursor minerals, and the competition with neighbouring growing minerals. In addition, given the likely effects of varying protolith compositions and metamorphic conditions on elemental behaviours, we classify meta-mafic rocks from global palaeo-subduction-zones with varying metamorphic conditions into groups in terms of their protolith compositions (i.e. ocean island basalt (OIB)-like, enriched mid-ocean ridge basalt (MORB)-like, normal [N]-MORB-like), and discuss geochemical behaviours of chemical elements within these co-genetic groups rather than simply accepting the conclusions in the literature. We also discuss the geochemical consequences of SZM with implications for chemical geodynamics, and propose with emphasis that: (1) the traditionally accepted ‘fluid flux induced-melting’ model for arc magmatism requires revision; and (2) the residual subducted ocean crust cannot be the major source material for OIB, although it can contribute to the deep mantle compositional heterogeneity. We also highlight some important questions and problems that need further investigations, e.g. complex subduction-zone geochemical processes, different contributions of seafloor subduction and resultant subduction of continental materials, and the representativeness of studied HP–UHP metamorphic rocks.
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影响因子：
5.3
作者：
M. Konrad‐Schmolke;T. Zack;P. O'Brien;Dorrit E. Jacob-
通讯作者：
M. Konrad‐Schmolke;T. Zack;P. O'Brien;Dorrit E. Jacob-
DOI：
10.1007/978-3-642-28394-9_9
发表时间：
2013
期刊：
--
影响因子：
--
作者：
G. Bebout
通讯作者：
G. Bebout
影响因子：
5
作者：
K. Domanik;J. Holloway
通讯作者：
K. Domanik;J. Holloway
对俯冲带变质作用的元素响应：来自中国西北祁连山的约束
影响因子：
3.5
作者：
Yuanyuan Xiao;Yaoling Niu;Shuguang Song;Jon Davidson;Xiaoming Liu
通讯作者：
Xiaoming Liu
影响因子：
3.9
作者：
M. Feineman;F. Ryerson;D. DePaolo;T. Plank
通讯作者：
M. Feineman;F. Ryerson;D. DePaolo;T. Plank