南秦岭竹山地区早古生代碱性岩浆活动及其相关铌稀土成矿的若干认识
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中国地质调查局资助项目(1212011220515,121201009000150013);国家自然科学基金资助项目(41502046,41530211)


Some new knowledge concerning Silurian alkaline magmatism and related Nb-REE mineralization in the Zhushan region, South Qinling
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    摘要:

    南秦岭竹山地区发育强烈的志留纪碱性岩浆活动,主要岩性包括正长岩、火成碳酸岩、粗面岩和碱性玄武岩,侵位时间集中于450~430 Ma。该期碱性岩浆活动主要形成于幔源碱性玄武质岩浆结晶分异演化,岩浆源区以HIMU组分为主,具有HIMU和EMⅠ、EMⅡ多种富集地幔端员混合特征。碱性杂岩体普遍发育铌、稀土矿化,形成了庙垭、杀熊洞、天宝等大型或超大型矿床。区域性深大断裂及其次级断裂控制了碱性杂岩体或碱性火山杂岩的空间展布,富碱和较高的结晶分异程度是成矿有利条件。幔源与洋壳俯冲消减、陆源沉积物再循环以及地幔流体交代作用关系密切。该期碱性岩浆-成矿事件形成于板块边缘岩石圈强烈伸展和幔源岩浆底侵上涌背景。

    Abstract:

    Intense alkaline magmatism and related Nb-REE mineralization occurred during the Silurian in the South Qinling belt, forming igneous rocks including syenites, carbonatites, trachytes and alkali basalts. The alkaline magma erupted during 450~430 Ma, at the same time with intense ultramafic and mafic activities in the region. These alkaline rocks were formed through fractional crystallization from mantle-derived magmas. The magma sources were likely composed of dominated HIMU mantle and minor EMI and EMⅡ mantle. The high values of alkali (K2O+Na2O) and protracted fractional crystallization constituted important geodynamic controls on the Nb-REE mineralization. The Silurian alkaline magmatic activities were generated in an intensive lithospheric extension and mantle upwelling setting, while the enriched lithospheric mantle was metasomitized by slab melts related to the subduction system.

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朱江,程昌红,王连训,彭三国,彭练红,许珂,2017,南秦岭竹山地区早古生代碱性岩浆活动及其相关铌稀土成矿的若干认识[J].岩石矿物学杂志,36(5):681~690. ZHU Jiang, CHENG Chang-hong, WANG Lian-xun, PENG San-guo, PENG Lian-hong, XU Ke,2017,Some new knowledge concerning Silurian alkaline magmatism and related Nb-REE mineralization in the Zhushan region, South Qinling[J]. Acta Petrologica et Mineralogica,36(5):681~690.

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  • 收稿日期:2017-01-02
  • 最后修改日期:2017-07-31
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  • 在线发布日期: 2017-09-19
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