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首页> 外文期刊>Journal of Asian earth sciences >A synthesis and new perspective on the petrogenesis of kamafugites from West Qinling, China, in a global context
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A synthesis and new perspective on the petrogenesis of kamafugites from West Qinling, China, in a global context

机译：全球背景下来自中国西秦岭的卡马呋虫类岩石成因的综合和新观点

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摘要

We discuss the overall characteristics of a recently recognized kamafugite province in West Qinling, China, using field observations and geochemical data. We discuss the petrogenesis of the kamafugites using new bulk-rock major and trace element data and Sr-Nd isotope compositions of representative samples together with the literature data (in Chinese) and comparing them with type kamafugite suites from Italy, Brazil and Uganda. All these four kamafugite suites show OIB-like rare earth element (REE) patterns, but are much more enriched than OIB in the progressively more incompatible elements. The West Qinling kamafugite samples resemble closely the Ugandan and Brazilian suites in having a negative anomaly of K, P and Ti and a positive Nb-Ta anomaly, yet the Italian suite shows conspicuously a negative Nb-Ta anomaly. The four kamafugite suites have different _(Nd)~ε(t) values and ~(87)Sr/~(85)Sri ratios, implying their distinct sources and source histories. We consider that the ideal sources for kamafugite magmas are most likely metasomatized sub-continental lithosphere with components of ancient seafloor subducted calcareous terrigenous sediments. The close association of kamafugite with carbonatite worldwide, including the West Qinling suite, is consistent with both being derived from a single CO_2-rich silicate parental magma segregated during ascent as a result of decompression-induced immiscibility. In terms of both sources (or source histories) and processes, our simple interpretation can effectively explain the petrogenesis of all the apparently different kamafugite suites suggests that the petrogenesis of kamafugites may actually be simple. Further effort should aim to test whether our interpretation is indeed valid globally.
机译：我们使用实地观测和地球化学数据，讨论了中国西秦岭一个最近被认可的卡马富岩省的总体特征。我们使用新的块状岩石主量和微量元素数据以及代表性样品的Sr-Nd同位素组成以及文献数据（中文），讨论了卡马富奇岩的成因，并将它们与来自意大利，巴西和乌干达的卡马富奇岩类型套件进行了比较。所有这四个kafufugite套件都显示出类似于OIB的稀土元素（REE）模式，但在逐渐变得更加不兼容的元素中比OIB丰富得多。西秦岭的kamafugite样品与K，P和Ti的负异常和Nb-Ta的正异常非常类似于乌干达和巴西的套件，而意大利套件的Nb-Ta的异常明显。四个卡玛夫石套件具有不同的_（Nd）〜ε（t）值和〜（87）Sr /〜（85）Sri比，这意味着它们的来源和来源历史各不相同。我们认为，卡玛夫石岩浆的理想来源很可能是交代的次大陆岩石圈，其成分是古代海底俯冲的钙质陆源沉积物。全世界，包括西秦岭套装，卡马富铁矿与碳酸盐岩的紧密联系，与两者均源自减压引起的不混溶性上升过程中分离出的单一富含CO_2的硅酸盐母岩浆有关。在来源（或来源历史）和过程方面，我们的简单解释可以有效地解释所有明显不同的卡马铁石套件的成岩作用，表明卡马铁石的成岩作用实际上可能很简单。进一步的努力应该旨在检验我们的解释在全球是否确实有效。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第ptaa期|86-96|共11页
  • 作者

    Pengyuan Guo; Yaoling Niu; Xuehui Yu;

  • 作者单位

    School of Earth Sciences. Lanzhou University, Lanzhou 730000, China;

    Department of Earth Sciences, Durham University, Durham DM 3LE, UK ,Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China ,School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;

    School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;

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  • 正文语种 eng
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  • 关键词

    West Qinling; Kamafugite; Petrogenesis; Geochemistry; Immiscibility;

    机译：西秦岭Kamafugite;成岩作用地球化学;不混溶;

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