高级检索
    邹占春，刘俊玉，陈建，李景波，丁正江，孙丽莎，李双飞，唐名鹰，张蕾，王欣然. 2024. 胶东西南部三合山岩体岩石成因和构造背景：年代学、地球化学及Sr−Nd−Pb−Hf 同位素约束[J]. 中国地质, 51(4): 1387−1410. DOI: 10.12029/gc20211227002
    引用本文: 邹占春，刘俊玉，陈建，李景波，丁正江，孙丽莎，李双飞，唐名鹰，张蕾，王欣然. 2024. 胶东西南部三合山岩体岩石成因和构造背景：年代学、地球化学及Sr−Nd−Pb−Hf 同位素约束[J]. 中国地质, 51(4): 1387−1410. DOI: 10.12029/gc20211227002
    shu
    Zou Zhanchun, Liu Junyu, Chen Jian, Li Jingbo, Ding Zhengjiang, Sun Lisha, Li Shuangfei, Tang Mingying, Zhang Lei, Wang Xinran. 2024. Petrogenesis and tectonic setting of the Sanheshan pluton in southwest of Jiaodong: Evidence from geochronology, geochemistry and Sr−Nd−Pb−Hf isotopes[J]. Geology in China, 51(4): 1387−1410. DOI: 10.12029/gc20211227002
    Citation: Zou Zhanchun, Liu Junyu, Chen Jian, Li Jingbo, Ding Zhengjiang, Sun Lisha, Li Shuangfei, Tang Mingying, Zhang Lei, Wang Xinran. 2024. Petrogenesis and tectonic setting of the Sanheshan pluton in southwest of Jiaodong: Evidence from geochronology, geochemistry and Sr−Nd−Pb−Hf isotopes[J]. Geology in China, 51(4): 1387−1410. DOI: 10.12029/gc20211227002
    shu

    胶东西南部三合山岩体岩石成因和构造背景：年代学、地球化学及Sr−Nd−Pb−Hf 同位素约束

    Petrogenesis and tectonic setting of the Sanheshan pluton in southwest of Jiaodong: Evidence from geochronology, geochemistry and Sr−Nd−Pb−Hf isotopes

      摘要
    • 摘要:
      研究目的 胶东地区是中国最大的金矿矿集区，也是山东省最为重要的铜钼多金属矿成矿区。加强中生代花岗岩的岩相学、岩石地球化学和年代学等方面的研究，有利于进一步促进该区金及多金属矿的找矿工作。
      研究方法 本文以胶东半岛西南部三合山岩体中细粒二长花岗岩和花岗斑岩为研究对象，开展系统的岩相学、LA−ICP−MS 锆石U−Pb 年代学、主微量元素地球化学、全岩Sr−Nd−Pb 同位素及锆石Lu−Hf 同位素研究，旨在探讨其岩石成因、岩浆源区性质和构造背景。
      研究结果 LA−ICP−MS锆石U−Pb定年结果表明，中细粒二长花岗岩的成岩年龄为（115.42±0.27）Ma，花岗斑岩的形成年龄为（115.21±0.25）Ma，形成时代均属中生代早白垩晚期；岩石地球化学特征表明，中细粒二长花岗岩和花岗斑岩均属高钾钙碱性I型花岗质岩石，LREE较HREE分馏明显，具弱Ce负异常和明显Eu中等负异常，富集Rb、K、Zr和Hf，亏损Sr、Ba、Nb、P、Ti；全岩Sr−Nd−Pb及锆石Hf同位素分析结果表明，三合山岩体起源于重熔的下地壳，并受到了幔源物质的混染。
      结论 三合山岩体形成于早白垩世太平洋板块相对欧亚板块俯冲导致的陆内伸展背景下，为中国东部岩石圈减薄过程中壳幔相互作用的产物。

       

      Abstract:
      This paper is the result of geological survey engineering.
      Objective Jiaodong area is the largest gold ore concentration area in China and the most important copper−molybdenum polymetallic ore deposit area in Shandong Province. Strengthening the study of petrography, petrogeochemistry and chronology of Mesozoic granites is conducive to further promoting the prospecting of gold and polymetallic deposits in this area.
      Methods Taking the medium−fine grained monzogranite and granite porphyry as the main research object, this study primarily carried onlaser ablation inductively coupled plasma mass spectrometry (LA−ICP−MS) U−Pb chronology on the zircon, whole−rock geochemistry,whole−rock Sr−Nd−Pb and zircon Hf isotopic study, aiming to confirm the timing and discuss the petrogenesis and tectonic settings of the Sanheshan pluton in Southwest Jiaodong.
      Results The results of LA−ICP−MS zircon U−Pb show that the medium−fine grained monzogranite was formed in (115.42 ± 0.27) Ma and the granite porphyry was formed in (115.21±0.25) Ma, both of which are belonging to the Late Early Cretaceous of Mesozoic. Geocahemical research shows that the medium−fine grained monzogranite and granite porphyry are both belong to themetaluminous high−K calc−alkaline series I−type granites; LREE are more obvious than HREE,with weak Ce negative anomaly and obvious Eu moderate negative anomaly; trace elements enriched in Rb, K, Zr and Hf, depleted in Sr, Ba, Nb, P and Ti. The whole rock Sr−Nd−Pb and zircon Hf isotope analysis results show that the Sanheshan pluton was originated from the remelting lower crust, and was contaminated by mantle materials.
      Conclusions The Sanheshanpluton was formed in the continental extension background caused by the subduction of the Pacific plate relative to the Eurasian plate in the Early Cretaceous, which was the product of crust−mantle interaction during the lithospheric thinning in eastern China.

       

      • HTML全文
      • 参考文献(113)
      • 相关文章
      • 施引文献
    • 资源附件(0)

    /

    返回文章
    返回