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首页> 外文期刊>Journal of Asian earth sciences >Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China
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Chronology, geochemistry and Sr-Nd isotope studies of Jurassic intrusions in the Diyanqinamu porphyry Mo mine, central Inner Mongolia, China

机译：内蒙古中部地亚基纳木斑岩钼矿侏罗纪侵入体的年代学，地球化学和Sr-Nd同位素研究

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摘要

Available cores of porphyritic granite and aplitic granite from the Diyanqinamu porphyry Mo deposit in the north central Great Xing'an Range presented an opportunity to examine and analyze Mesozoic igneous rocks far from the Paleo-Pacific subduction zone. The Diyanqinamu granites are highly fractionated I-type, distinguished from the M-, A- or S-type granite by: high SiO_2, and Rb; low Zr, Nb, Y, and Ce; low Fe_2O_3~(total)/MgO and (K_2O + Na_2O)/CaO ratios; low alumina saturation index (＜1.1); low initial I_(Sr) ratios (0.70137-0.70451); positive εNd(t) values (2.37-3.77); and negative correlation between P_2O_5 and SiO_2. The aplitic granites were generated by fractional crystallization of the porphyritic granite, as evidenced by: spatial proximity; consistent zircon U-Pb ages (156 Ma) within error; correlations between other oxides and SiO_2 in Haker diagrams; low Ba, Sr, Nb, P, Ti, Eu; linear relationship in both (La/Yb)_N vs. La and Sr vs. Ba diagrams; and, decreasing LREE and ΣREE with increasing SiO_2. The Diyanqinamu granites have young depleted-mantle two-stage model ages (avg. T_(DM2) = 660 Ma) similar to those of most Mesozoic voluminous felsic magmas in northeastern China, and were likely sourced from pre-existent crustal components both "old" and juvenile that had been juxtaposed during the tectonic evolution of the Paleo-Asian Ocean. These granites project in the transitional field from syn-collision to post-collision tectonic settings on tectonic discrimination diagrams, implying emplacement in an extensional environment. Extensional volcanism and basin formation in the Great Xing'an Range region in Late Jurassic is coeval with the Diyanqinamu granites, demonstrating that post-orogenic lithospheric extension related to the closure of the Mongol-Okhotsk Ocean was the main driving force for Late Jurassic magmatism in this region.
机译：大兴安岭北部中部迪彦奇纳木斑岩钼矿床的斑状花岗岩和圈状花岗岩的可用岩心为研究和分析远离古太平洋俯冲带的中生代火成岩提供了机会。迪彦奇纳木花岗岩属于高分型I型花岗岩，与M型，A型或S型花岗岩的区别在于：高SiO_2和Rb；低Zr，Nb，Y和Ce Fe_2O_3〜（总）/ MgO和（K_2O + Na_2O）/ CaO比低;氧化铝饱和指数低（＜1.1）；低的初始I_（Sr）比（0.70137-0.70451）; εNd（t）正值（2.37-3.77）; P_2O_5与SiO_2之间呈负相关。斑状花岗岩的分步结晶产生了顶生花岗岩，表现为：空间邻近性；误差范围内一致的锆石U-Pb年龄（156 Ma）； Haker图中其他氧化物与SiO_2之间的相关性；低Ba，Sr，Nb，P，Ti，Eu （La / Yb）_N对La和Sr对Ba图的线性关系;随着SiO_2的增加，LREE和ΣREE降低。迪彦奇纳木花岗岩具有与中国东北大多数中生代大型长英质岩浆相似的年轻的幔幔两阶段模型年龄（平均T_（DM2）= 660 Ma），并且很可能来自早已存在的地壳成分。以及在古亚洲海洋构造演化过程中并存的少年。这些花岗岩投射在构造判别图上从同碰撞到碰撞后的构造环境的过渡场中，这意味着它被安置在伸展的环境中。晚侏罗世大兴安岭地区的伸展火山作用和盆地形成与迪亚尼奇纳姆花岗岩同时期，表明与蒙古-鄂霍次克海封闭有关的造山后岩石圈伸展是该地区晚侏罗世岩浆作用的主要驱动力。这个地区。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|85-97|共13页
  • 作者

    Hairui Sun; Zhilong Huang; Wenbo Li; Chengbiao Leng; Deyun Ma; Xingchun Zhang;

  • 作者单位

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    Shandong Goldgroup Co., Ltd., Jinan 250014, China;

    State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

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  • 正文语种 eng
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  • 关键词

    Porphyry Mo; Jurassic granite; Diyanqinamu; Great Xing'an Range; Mongol-Okhotsk Orogenic belt; Central Asian Orogenic Belt;

    机译：斑岩钼;侏罗纪花岗岩;地亚那那木大兴安岭;蒙古-鄂霍次克造山带;中亚造山带;

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