Sm-Nd Isotope Tracer Study of UHP Metamorphic Rocks: Implications for Continental Subduction and Collisional Tectonics
Sm-Nd Isotope Tracer Study of UHP Metamorphic Rocks: Implications for Continental Subduction and Collisional Tectonics
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DOI：
10.1080/00206819909465175
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发表时间：
1999-10
影响因子：
2.6
通讯作者：
B. Jahn
中科院分区：
文献类型：
--
作者：
B. Jahn
Sm-Nd同位素示踪技术是鉴别超高压和高压岩石原岩性质的有力工具，可用于约束大陆碰撞构造过程的模拟。超高压岩石可能有不同的成因，并不是所有的超高压岩石都具有相同的大陆板块俯冲的意义。本文对西欧阿尔卑斯带、海西带、加里东带、北方非洲泛非带和南极罗斯带的超高压和高压岩石（主要为榴辉岩和石榴橄榄岩）的Sm-Nd同位素数据进行了整理。并与大别造山带超高压岩石的同位素特征进行了对比。除了Dora-Maira（西阿尔卑斯山）的含柯石英的石英质变质沉积物显然是大陆成因的外，阿尔卑斯、海西和泛非带的所有高压和超高压岩石（榴辉岩和超镁铁质岩）都具有大洋亲缘性，具有特征性的正eNd（T）值。
Sm-Nd isotope tracer techniques are powerful tools in identification of the protolith nature of UHP and HP rocks and can be used to constrain modeling of tectonic processes of continental collision. UHP rocks may have diverse origins, and not all of them carry the same significance for subduction of continental blocks. In this paper, Sm-Nd isotopic data are compiled for UHP and HP rocks, mostly represented by eclogites and garnet peridotites, from the Alpine, Hercynian (Variscan), and Caledonian belts of western Europe; the Pan-African belts of northern Africa; and the Ross belt of Antarctica. These data then are compared with the isotopic characteristics of the UHP rocks from the Dabie orogen of central China. Except for the coesite-bearing quartzitic metasediments of Dora-Maira (Western Alps), which are clearly of continental origin, all HP and UHP rocks (eclogites and ultramafic rocks) from the Alpine, Hercynian, and Pan-African belts have oceanic affinities with the characteristic positive eNd(T) valu...