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首页> 外文期刊>Journal of Asian earth sciences >Zircon ages and Hf isotopic constraints on sources of clastic metasediments of the Slyudyansky high-grade complex, southeastern Siberia: Implication for continental growth and evolution of the Central Asian Orogenic Belt
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Zircon ages and Hf isotopic constraints on sources of clastic metasediments of the Slyudyansky high-grade complex, southeastern Siberia: Implication for continental growth and evolution of the Central Asian Orogenic Belt

机译：西伯利亚东南部Slyudyansky高品位复合体碎屑沉积物来源的锆石年龄和Hf同位素约束：对中亚造山带的大陆生长和演化的启示

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摘要

We present results of combined in situ U-Pb dating of detrital zircons and zircon Hf and whole-rock Nd isotopic compositions for high-grade clastic metasedimentary rocks of the Slyudyansky Complex in eastern Siberia. This complex is located southwest of Lake Baikal and is part of an early Paleozoic metamor-phic terrane in the eastern part of the Central Asian Orogenic Belt (CAOB). Our new zircon ages and Hf isotopic data as well as whole-rock Nd isotopic compositions provide important constraints on the time of deposition and provenance of early Paleozoic high-grade metasedimentary rocks as well as models of crustal growth in Central Asia. Ages of 0.49-0.90 Ga for detrital zircons from early Paleozoic high-grade clastic sediments indicate that deposition occurred in the late Neoproterozoic and early Paleozoic, between ca. 0.62-0.69 and 0.49-0.54 Ga. Hf isotopic data of 0.82-0.69 Ga zircons suggest Archean and Paleoproterozoic (ca. 2.7-2.8 and 2.2-2.3 Ga; Hfc - 2.5-3.9 Ga) sources that were affected by juvenile 0.69-0.82 Ga Neoproterozoic magmatism. An additional protolith was also identified. Its zircons yielded ages of 2.6-2.7 Ga, and showed high positive εHf(t) values of +4.1 to +8.0, and Hf model ages t_(Hf(DM)) = t_(Hfc) = 2.6-2.8 Ga, which is nearly identical to the crystallization ages. These isotopic characteristics suggest that the protolith was quite juvenile. The whole-rock Nd isotopic data indicate that at least part of the Slyudyansky Complex metasediments was derived from "non-Siberian" provenances. The crustal development in the eastern CAOB was characterized by reworking of the early Precambrian continental crust in the early Neoproterozoic and the late Neoproterozoic-early Paleozoic juvenile crust formation.
机译：我们提出了碎屑锆石和锆石Hf的原位U-Pb测年结果​​和西伯利亚东部Slyudyansky复杂的高级碎屑沉积沉积岩的全岩Nd同位素组成。该复合体位于贝加尔湖西南，是中亚造山带（CAOB）东部早期的古生代变质地层的一部分。我们新的锆石年龄和Hf同位素数据以及全岩Nd同位素组成对早古生代高品位沉积沉积岩的沉积时间和物源以及中亚地壳生长模型提供了重要的限制。来自早古生代高级碎屑沉积的碎屑锆石的年龄为0.49-0.90 Ga，表明沉积发生在新元古代晚期和早古生代之间。 0.62-0.69和0.49-0.54 Ga.0.82-0.69 Ga锆石的Hf同位素数据表明，受少年0.69-0.82影响的太古代和古元古代（大约2.7-2.8和2.2-2.3 Ga; Hfc-2.5-3.9 Ga）源嘎新元古代的岩浆作用。还确定了其他原型。其锆石的年龄为2.6-2.7 Ga，并显示出高的正εHf（t）值，从+4.1至+ 8.0，Hf模型的年龄为t_（Hf（DM））= t_（Hfc）= 2.6-2.8 Ga，即几乎与结晶时代相同。这些同位素特征表明原石很幼稚。整个岩石的Nd同位素数据表明，Slyudyansky Complex沉积物的至少一部分来自“非西伯利亚”物源。 CAOB东部的地壳发育以新元古代早期和新元古代晚期至早古生代幼年地壳形成的前寒武纪大陆壳的再造为特征。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第30期|18-36|共19页
  • 作者

    Victor Kovach; Ekaterina Salnikova; Kuo-Lung Wang; Bor-Ming Jahn; Han-Yi Chiu; Leonid Reznitskiy; Alexander Kotov; Yoshiyuki Iizuka; Sun-Lin Chung;

  • 作者单位

    Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia;

    Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia;

    Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan;

    Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia,Department of Ceosciences, National Taiwan University, Taipei, Taiwan;

    Department of Ceosciences, National Taiwan University, Taipei, Taiwan;

    Institute of the Earth Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia;

    Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia;

    Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan;

    Department of Ceosciences, National Taiwan University, Taipei, Taiwan;

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  • 正文语种 eng
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  • 关键词

    central asian orogenic belt; slyudyansky complex; zircon ages; Nd-Hf isotopes; continental growth;

    机译：中亚造山带斯柳扬斯基综合体;锆石年龄Nd-Hf同位素;大陆增长;

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