LA-ICP-MS Zircon U-Pb Dating and Geochemical Characteristics of Kalajiareke Rock Mass in Northern Altay Orogenic Belt and Its Geological Significance
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摘要: 喀拉加热克岩体的岩性为片麻状花岗闪长斑岩，其形成时代为（450.6±3）Ma，为晚奥陶世侵入岩，主量元素表明该岩体为过铝质钙碱性岩岩石系列，推断其形成上是地幔基性岩浆以底侵方式就位于年轻地幔底部，大量的热量促使上覆地壳物质部分熔融形成壳-幔混合花岗岩质岩浆。在不饱和水的条件下，由富含白云母和黑云母的变质砂岩脱水熔融形成的。微量元素Ba、Nb、Sr、Ti元素呈现明显的负异常，Rb、U、La、Nd、Zr、Hf、Y的正异常。并且Nb的亏损不明显，K、Rb等有明显的增加。反映了碰撞花岗岩的基本特征。稀土元素整体上表现为轻稀土富集，重稀土亏损，轻重稀土分馏不明显，并出现Eu的弱的负异常。结合大地构造演化，认为喀拉加热克花岗闪长斑岩岩体所处的环境为同碰撞-俯冲的环境。Abstract: The Kalajiareke rock mass is composed of gneissic granite porphyry, with formation age of (450.6±3) Ma, which is the Late Ordovician intrusive rock. The geochemical data suggests that this rock mass belongs to peraluminous cal-alkaline rock series. It's inferred that the mantle-based magma is located at the bottom of the young mantle in the forming process of this intrusion, and a large amount of heat causes the overlying crust material to partially melt for forming the crust-mantle mixed granite magma. In the unsaturated water conditions, this intrusion was formed by the dehydration melting of rich muscovite and biotite metamorphic sandstone. The Ba, Nb, Sr and Ti elements show obvious negative anomalies, while the Rb, U, La, Nd, Zr, Hf and Y have positive anomalies. The loss of Nb is not obvious, but the K and Rb contents have a significant increase. All of these characters reflect the basic characteristics of collision granite. Rare earth elements show the enrichment of light rare earth and the loss of heavy rare earth, with not obvious fractionation of light and heavy rare earth and weak negative anomalies of Eu element. Combined with the tectonic evolution, it is believed that the Kalajiareke granite granodiorite porphyry was formed in the syn-collision subduction environment.
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