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内蒙古四子王旗地区小南山辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义

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党智财, 李俊建, 赵泽霖, 付超, 唐文龙. 内蒙古四子王旗地区小南山辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J]. 地质通报, 2016, 35(4): 583-592.
引用本文: 党智财, 李俊建, 赵泽霖, 付超, 唐文龙. 内蒙古四子王旗地区小南山辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J]. 地质通报, 2016, 35(4): 583-592.
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DANG Zhicai, LI Junjian, ZHAO Zelin, FU Chao, TANG Wenlong. LA-ICP-MS zircon U-Pb dating of the gabbro from Xiaonanshan, Siziwang Banner, Inner Mongolia, and its geological significance[J]. Geological Bulletin of China, 2016, 35(4): 583-592.
Citation: DANG Zhicai, LI Junjian, ZHAO Zelin, FU Chao, TANG Wenlong. LA-ICP-MS zircon U-Pb dating of the gabbro from Xiaonanshan, Siziwang Banner, Inner Mongolia, and its geological significance[J]. Geological Bulletin of China, 2016, 35(4): 583-592.
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内蒙古四子王旗地区小南山辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义

  • 1. 中国地质调查局天津地质矿产研究所, 天津 300170;
    2. 中国地质科学院研究生部, 北京 100037

LA-ICP-MS zircon U-Pb dating of the gabbro from Xiaonanshan, Siziwang Banner, Inner Mongolia, and its geological significance

  • 1. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China;
    2. Graduate School of Chinese Academy of Geological Sciences, Beijing 100037, China

    摘要
  • 四子王旗地区小南山为内蒙古中部镁铁质-超镁铁质岩带内发育的一个中型铜镍铂硫化物矿床,辉长岩为含矿岩体的成矿母岩。岩石主量、微量及稀土元素分析结果表明,小南山辉长岩属于铁质镁铁质岩,具有拉斑玄武岩系列演化趋势,相对富集大离子亲石元素(Rb、Ba、U、Pb等)和亏损高场强元素(Nb、Ta、Ti),并具有轻、重稀土元素分馏相对明显、轻稀土元素相对富集、重稀土元素亏损的右倾型稀土元素配分模式。采用LA-ICP-MS锆石U-Pb测年法,获得小南山辉长岩年龄结果为272.7±2.9Ma,代表了小南山辉长岩体的成岩成矿时代,属中二叠世。区域地质资料及微量元素特征表明,小南山岩体可能形成于板内构造环境。
    Located on the northwestern margin of the North China Craton, Siziwang Banner belongs tectonically to Bayun Obo mar-ginal rift. It is about 100km away from the north of Solonker suture. A mafic-ultramafic belt is exposed in central Inner Mongolia, in EW extension roughly 300km long and 30km wide, comprising a favorable metallogenic belt for Cu-Ni (PGE) sulfide deposits. Many Cu-Ni (PGE) deposits (ore spots) have been found here including the Xiaonanshan Cu-Ni (PGE) deposit. The Xiaonanshan intrusion consists of gabbro and belongs to the tholetiitic series in petrochemical composition. Most of the rocks are relatively en-riched in large ion lithophile elements (Rb, Ba, U, Pb) and depleted in high field strength elements (Nb, Ta, Ti), exhibiting right-in-clined linear REE patterns with LREE enrichment relative to HREE. LA-ICP-MS U-Pb dating of zircons from Xiaonanshan orebearing gabbro yielded an age of 272.7±2.9Ma, indicating that the pluton should be the Mid-Permain intrusion. According to the re-gional geology, combined with the geochemical features, it may be inferred that the intrusion may be associated with intraplate tec-tonic setting.
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收稿日期:  2015-10-23
修回日期:  2016-03-15
刊出日期:  2016-04-15

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